Add m-esr52 at 52.6.0

98 files changed, 33863 insertions, 0 deletions

diff --git a/nsprpub/pr/src/md/Makefile.in b/nsprpub/pr/src/md/Makefile.in
new file mode 100644
index 000000000..e72bc65ab
--- /dev/null
+++ b/nsprpub/pr/src/md/Makefile.in
@@ -0,0 +1,32 @@
+# 
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#! gmake
+
+MOD_DEPTH	= ../../..
+topsrcdir	= @top_srcdir@
+srcdir		= @srcdir@
+VPATH		= @srcdir@
+
+include $(MOD_DEPTH)/config/autoconf.mk
+
+include $(topsrcdir)/config/config.mk
+
+DIRS = $(PR_MD_ARCH_DIR)
+
+CSRCS =          \
+	prosdep.c \
+	$(NULL)
+
+TARGETS	= $(OBJS)
+
+INCLUDES = -I$(dist_includedir) -I$(topsrcdir)/pr/include
+
+DEFINES	+= -D_NSPR_BUILD_
+
+include $(topsrcdir)/config/rules.mk
+
+export:: $(TARGETS)
+
diff --git a/nsprpub/pr/src/md/beos/Makefile.in b/nsprpub/pr/src/md/beos/Makefile.in
new file mode 100644
index 000000000..340f144a8
--- /dev/null
+++ b/nsprpub/pr/src/md/beos/Makefile.in
@@ -0,0 +1,28 @@
+# 
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+MOD_DEPTH	= ../../../..
+topsrcdir	= @top_srcdir@
+srcdir		= @srcdir@
+VPATH		= @srcdir@
+
+include $(MOD_DEPTH)/config/autoconf.mk
+
+include $(topsrcdir)/config/config.mk
+
+include $(srcdir)/bsrcs.mk
+CSRCS += $(MDCSRCS)
+
+TARGETS		= $(OBJS)
+
+INCLUDES = -I$(dist_includedir) -I$(topsrcdir)/pr/include -I$(topsrcdir)/pr/include/private
+
+DEFINES	+= -D_NSPR_BUILD_
+
+include $(topsrcdir)/config/rules.mk
+
+export:: $(TARGETS)
+
diff --git a/nsprpub/pr/src/md/beos/bcpu.c b/nsprpub/pr/src/md/beos/bcpu.c
new file mode 100644
index 000000000..6c2538654
--- /dev/null
+++ b/nsprpub/pr/src/md/beos/bcpu.c
@@ -0,0 +1,23 @@
+/* -*- Mode: C++; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+PR_EXTERN(void) _PR_MD_INIT_CPUS();
+PR_EXTERN(void) _PR_MD_WAKEUP_CPUS();
+PR_EXTERN(void) _PR_MD_START_INTERRUPTS(void);
+PR_EXTERN(void) _PR_MD_STOP_INTERRUPTS(void);
+PR_EXTERN(void) _PR_MD_DISABLE_CLOCK_INTERRUPTS(void);
+PR_EXTERN(void) _PR_MD_BLOCK_CLOCK_INTERRUPTS(void);
+PR_EXTERN(void) _PR_MD_UNBLOCK_CLOCK_INTERRUPTS(void);
+PR_EXTERN(void) _PR_MD_CLOCK_INTERRUPT(void);
+PR_EXTERN(void) _PR_MD_INIT_STACK(PRThreadStack *ts, PRIntn redzone);
+PR_EXTERN(void) _PR_MD_CLEAR_STACK(PRThreadStack* ts);
+PR_EXTERN(PRInt32) _PR_MD_GET_INTSOFF(void);
+PR_EXTERN(void) _PR_MD_SET_INTSOFF(PRInt32 _val);
+PR_EXTERN(_PRCPU*) _PR_MD_CURRENT_CPU(void);
+PR_EXTERN(void) _PR_MD_SET_CURRENT_CPU(_PRCPU *cpu);
+PR_EXTERN(void) _PR_MD_INIT_RUNNING_CPU(_PRCPU *cpu);
+PR_EXTERN(PRInt32) _PR_MD_PAUSE_CPU(PRIntervalTime timeout);
diff --git a/nsprpub/pr/src/md/beos/beos.c b/nsprpub/pr/src/md/beos/beos.c
new file mode 100644
index 000000000..a1df7d2f1
--- /dev/null
+++ b/nsprpub/pr/src/md/beos/beos.c
@@ -0,0 +1,232 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+#include <signal.h>
+#include <unistd.h>
+#include <memory.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/ioctl.h>
+#include <errno.h>
+
+/*
+ * Make sure _PRSockLen_t is 32-bit, because we will cast a PRUint32* or
+ * PRInt32* pointer to a _PRSockLen_t* pointer.
+ */
+#define _PRSockLen_t int
+
+/*
+** Global lock variable used to bracket calls into rusty libraries that
+** aren't thread safe (like libc, libX, etc).
+*/
+static PRLock *_pr_rename_lock = NULL;
+static PRMonitor *_pr_Xfe_mon = NULL;
+
+/*
+ * Variables used by the GC code, initialized in _MD_InitSegs().
+ * _pr_zero_fd should be a static variable.  Unfortunately, there is
+ * still some Unix-specific code left in function PR_GrowSegment()
+ * in file memory/prseg.c that references it, so it needs
+ * to be a global variable for now.
+ */
+PRInt32 _pr_zero_fd = -1;
+static PRLock *_pr_md_lock = NULL;
+
+sigset_t timer_set;
+
+void _PR_UnixInit()
+{
+	struct sigaction sigact;
+	int rv;
+
+	sigemptyset(&timer_set);
+
+	sigact.sa_handler = SIG_IGN;
+	sigemptyset(&sigact.sa_mask);
+	sigact.sa_flags = 0;
+	rv = sigaction(SIGPIPE, &sigact, 0);
+	PR_ASSERT(0 == rv);
+
+	_pr_rename_lock = PR_NewLock();
+	PR_ASSERT(NULL != _pr_rename_lock);
+	_pr_Xfe_mon = PR_NewMonitor();
+	PR_ASSERT(NULL != _pr_Xfe_mon);
+}
+
+/*
+ *-----------------------------------------------------------------------
+ *
+ * PR_Now --
+ *
+ *     Returns the current time in microseconds since the epoch.
+ *     The epoch is midnight January 1, 1970 GMT.
+ *     The implementation is machine dependent.  This is the Unix
+ *     implementation.
+ *     Cf. time_t time(time_t *tp)
+ *
+ *-----------------------------------------------------------------------
+ */
+
+PR_IMPLEMENT(PRTime)
+PR_Now(void)
+{
+	struct timeval tv;
+	PRInt64 s, us, s2us;
+
+	GETTIMEOFDAY(&tv);
+	LL_I2L(s2us, PR_USEC_PER_SEC);
+	LL_I2L(s, tv.tv_sec);
+	LL_I2L(us, tv.tv_usec);
+	LL_MUL(s, s, s2us);
+	LL_ADD(s, s, us);
+	return s;
+}
+
+PRIntervalTime
+_PR_UNIX_GetInterval()
+{
+	struct timeval time;
+	PRIntervalTime ticks;
+
+	(void)GETTIMEOFDAY(&time);  /* fallicy of course */
+	ticks = (PRUint32)time.tv_sec * PR_MSEC_PER_SEC;  /* that's in milliseconds */
+	ticks += (PRUint32)time.tv_usec / PR_USEC_PER_MSEC;  /* so's that */
+	return ticks;
+}  /* _PR_SUNOS_GetInterval */
+
+PRIntervalTime _PR_UNIX_TicksPerSecond()
+{
+	return 1000;  /* this needs some work :) */
+}
+
+/************************************************************************/
+
+/*
+** Special hacks for xlib. Xlib/Xt/Xm is not re-entrant nor is it thread
+** safe.  Unfortunately, neither is mozilla. To make these programs work
+** in a pre-emptive threaded environment, we need to use a lock.
+*/
+
+void PR_XLock()
+{
+	PR_EnterMonitor(_pr_Xfe_mon);
+}
+
+void PR_XUnlock()
+{
+	PR_ExitMonitor(_pr_Xfe_mon);
+}
+
+PRBool PR_XIsLocked()
+{
+	return (PR_InMonitor(_pr_Xfe_mon)) ? PR_TRUE : PR_FALSE;
+}
+
+void PR_XWait(int ms)
+{
+	PR_Wait(_pr_Xfe_mon, PR_MillisecondsToInterval(ms));
+}
+
+void PR_XNotify(void)
+{
+	PR_Notify(_pr_Xfe_mon);
+}
+
+void PR_XNotifyAll(void)
+{
+	PR_NotifyAll(_pr_Xfe_mon);
+}
+
+#if !defined(BEOS)
+#ifdef HAVE_BSD_FLOCK
+
+#include <sys/file.h>
+
+PR_IMPLEMENT(PRStatus)
+_MD_LOCKFILE (PRInt32 f)
+{
+	PRInt32 rv;
+	rv = flock(f, LOCK_EX);
+	if (rv == 0)
+		return PR_SUCCESS;
+	_PR_MD_MAP_FLOCK_ERROR(_MD_ERRNO());
+	return PR_FAILURE;
+}
+
+PR_IMPLEMENT(PRStatus)
+_MD_TLOCKFILE (PRInt32 f)
+{
+	PRInt32 rv;
+	rv = flock(f, LOCK_EX|LOCK_NB);
+	if (rv == 0)
+		return PR_SUCCESS;
+	_PR_MD_MAP_FLOCK_ERROR(_MD_ERRNO());
+	return PR_FAILURE;
+}
+
+PR_IMPLEMENT(PRStatus)
+_MD_UNLOCKFILE (PRInt32 f)
+{
+	PRInt32 rv;
+	rv = flock(f, LOCK_UN);
+	if (rv == 0)
+		return PR_SUCCESS;
+	_PR_MD_MAP_FLOCK_ERROR(_MD_ERRNO());
+	return PR_FAILURE;
+}
+#else
+
+PR_IMPLEMENT(PRStatus)
+_MD_LOCKFILE (PRInt32 f)
+{
+	PRInt32 rv;
+	rv = lockf(f, F_LOCK, 0);
+	if (rv == 0)
+		return PR_SUCCESS;
+	_PR_MD_MAP_LOCKF_ERROR(_MD_ERRNO());
+	return PR_FAILURE;
+}
+
+PR_IMPLEMENT(PRStatus)
+_MD_TLOCKFILE (PRInt32 f)
+{
+	PRInt32 rv;
+	rv = lockf(f, F_TLOCK, 0);
+	if (rv == 0)
+		return PR_SUCCESS;
+	_PR_MD_MAP_LOCKF_ERROR(_MD_ERRNO());
+	return PR_FAILURE;
+}
+
+PR_IMPLEMENT(PRStatus)
+_MD_UNLOCKFILE (PRInt32 f)
+{
+	PRInt32 rv;
+	rv = lockf(f, F_ULOCK, 0);
+	if (rv == 0)
+		return PR_SUCCESS;
+	_PR_MD_MAP_LOCKF_ERROR(_MD_ERRNO());
+	return PR_FAILURE;
+}
+#endif
+
+PR_IMPLEMENT(PRStatus)
+  _MD_GETHOSTNAME (char *name, PRUint32 namelen)
+{
+    PRIntn rv;
+
+    rv = gethostname(name, namelen);
+    if (0 == rv) {
+		return PR_SUCCESS;
+    }
+	_PR_MD_MAP_GETHOSTNAME_ERROR(_MD_ERRNO());
+    return PR_FAILURE;
+}
+
+#endif
diff --git a/nsprpub/pr/src/md/beos/beos_errors.c b/nsprpub/pr/src/md/beos/beos_errors.c
new file mode 100644
index 000000000..687a53519
--- /dev/null
+++ b/nsprpub/pr/src/md/beos/beos_errors.c
@@ -0,0 +1,1494 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "prtypes.h"
+#include "md/_unix_errors.h"
+#include "prerror.h"
+#include <errno.h>
+
+void _MD_unix_map_opendir_error(int err)
+{
+	switch (err) {
+		case ENOTDIR:
+			PR_SetError(PR_NOT_DIRECTORY_ERROR, err);
+			break;
+		case EACCES:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case EMFILE:
+			PR_SetError(PR_PROC_DESC_TABLE_FULL_ERROR, err);
+			break;
+		case ENFILE:
+			PR_SetError(PR_SYS_DESC_TABLE_FULL_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ELOOP:
+			PR_SetError(PR_LOOP_ERROR, err);
+			break;
+		case ENAMETOOLONG:
+			PR_SetError(PR_NAME_TOO_LONG_ERROR, err);
+			break;
+		case ENOENT:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_closedir_error(int err)
+{
+	switch (err) {
+		case EINVAL:
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_readdir_error(int err)
+{
+
+	switch (err) {
+		case 0:
+		case ENOENT:
+			PR_SetError(PR_NO_MORE_FILES_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+#ifdef IRIX
+#ifdef IRIX5_3
+#else
+		case EDIRCORRUPTED:
+			PR_SetError(PR_DIRECTORY_CORRUPTED_ERROR, err);
+			break;
+#endif
+#endif
+#ifdef EOVERFLOW
+		case EOVERFLOW:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+#endif
+		case EINVAL:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+#ifdef EBADMSG
+		case EBADMSG:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+#endif
+		case EDEADLK:
+			PR_SetError(PR_DEADLOCK_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case EIO:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case ENOLCK:
+			PR_SetError(PR_FILE_IS_LOCKED_ERROR, err);
+			break;
+#ifdef ENOLINK
+		case ENOLINK:
+			PR_SetError(PR_REMOTE_FILE_ERROR, err);
+			break;
+#endif
+		case ENXIO:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_unlink_error(int err)
+{
+	switch (err) {
+		case EACCES:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case EBUSY:
+			PR_SetError(PR_FILESYSTEM_MOUNTED_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case ELOOP:
+			PR_SetError(PR_LOOP_ERROR, err);
+			break;
+		case ENAMETOOLONG:
+			PR_SetError(PR_NAME_TOO_LONG_ERROR, err);
+			break;
+		case ENOENT:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case ENOTDIR:
+			PR_SetError(PR_NOT_DIRECTORY_ERROR, err);
+			break;
+		case EPERM:
+			PR_SetError(PR_IS_DIRECTORY_ERROR, err);
+			break;
+		case EROFS:
+			PR_SetError(PR_READ_ONLY_FILESYSTEM_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_stat_error(int err)
+{
+	switch (err) {
+		case EACCES:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case ETIMEDOUT:
+			PR_SetError(PR_REMOTE_FILE_ERROR, err);
+			break;
+		case ELOOP:
+			PR_SetError(PR_LOOP_ERROR, err);
+			break;
+		case ENAMETOOLONG:
+			PR_SetError(PR_NAME_TOO_LONG_ERROR, err);
+			break;
+		case ENOENT:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case ENOTDIR:
+			PR_SetError(PR_NOT_DIRECTORY_ERROR, err);
+			break;
+#ifdef EOVERFLOW
+		case EOVERFLOW:
+			PR_SetError(PR_BUFFER_OVERFLOW_ERROR, err);
+			break;
+#endif
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_fstat_error(int err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case ETIMEDOUT:
+#ifdef ENOLINK
+		case ENOLINK:
+#endif
+			PR_SetError(PR_REMOTE_FILE_ERROR, err);
+			break;
+#ifdef EOVERFLOW
+		case EOVERFLOW:
+			PR_SetError(PR_BUFFER_OVERFLOW_ERROR, err);
+			break;
+#endif
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_rename_error(int err)
+{
+	switch (err) {
+		case EACCES:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case EBUSY:
+			PR_SetError(PR_FILESYSTEM_MOUNTED_ERROR, err);
+			break;
+#ifdef EDQUOT
+		case EDQUOT:
+			PR_SetError(PR_NO_DEVICE_SPACE_ERROR, err);
+			break;
+#endif
+		case EEXIST:
+			PR_SetError(PR_DIRECTORY_NOT_EMPTY_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case EINVAL:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		case EIO:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case EISDIR:
+			PR_SetError(PR_IS_DIRECTORY_ERROR, err);
+			break;
+		case ELOOP:
+			PR_SetError(PR_LOOP_ERROR, err);
+			break;
+		case ENAMETOOLONG:
+			PR_SetError(PR_NAME_TOO_LONG_ERROR, err);
+			break;
+		case ENOENT:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case ENOSPC:
+			PR_SetError(PR_NO_DEVICE_SPACE_ERROR, err);
+			break;
+		case ENOTDIR:
+			PR_SetError(PR_NOT_DIRECTORY_ERROR, err);
+			break;
+		case EROFS:
+			PR_SetError(PR_READ_ONLY_FILESYSTEM_ERROR, err);
+			break;
+		case EXDEV:
+			PR_SetError(PR_NOT_SAME_DEVICE_ERROR, err);
+			break;
+		case EMLINK:
+			PR_SetError(PR_MAX_DIRECTORY_ENTRIES_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_access_error(int err)
+{
+	switch (err) {
+		case EACCES:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case EINVAL:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		case ELOOP:
+			PR_SetError(PR_LOOP_ERROR, err);
+			break;
+		case ETIMEDOUT:
+			PR_SetError(PR_REMOTE_FILE_ERROR, err);
+			break;
+		case ENAMETOOLONG:
+			PR_SetError(PR_NAME_TOO_LONG_ERROR, err);
+			break;
+		case ENOENT:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case ENOTDIR:
+			PR_SetError(PR_NOT_DIRECTORY_ERROR, err);
+			break;
+		case EROFS:
+			PR_SetError(PR_READ_ONLY_FILESYSTEM_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_mkdir_error(int err)
+{
+	switch (err) {
+		case ENOTDIR:
+			PR_SetError(PR_NOT_DIRECTORY_ERROR, err);
+			break;
+		case ENOENT:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case ENAMETOOLONG:
+			PR_SetError(PR_NAME_TOO_LONG_ERROR, err);
+			break;
+		case EACCES:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case EEXIST:
+			PR_SetError(PR_FILE_EXISTS_ERROR, err);
+			break;
+		case EROFS:
+			PR_SetError(PR_READ_ONLY_FILESYSTEM_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ELOOP:
+			PR_SetError(PR_LOOP_ERROR, err);
+			break;
+		case EMLINK:
+			PR_SetError(PR_MAX_DIRECTORY_ENTRIES_ERROR, err);
+			break;
+		case ENOSPC:
+			PR_SetError(PR_NO_DEVICE_SPACE_ERROR, err);
+			break;
+#ifdef EDQUOT
+		case EDQUOT:
+			PR_SetError(PR_NO_DEVICE_SPACE_ERROR, err);
+			break;
+#endif
+		case EIO:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_rmdir_error(int err)
+{
+
+	switch (err) {
+		case EACCES:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case EBUSY:
+			PR_SetError(PR_FILESYSTEM_MOUNTED_ERROR, err);
+			break;
+		case EEXIST:
+			PR_SetError(PR_DIRECTORY_NOT_EMPTY_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EINVAL:
+			PR_SetError(PR_DIRECTORY_NOT_EMPTY_ERROR, err);
+			break;
+		case EIO:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case ELOOP:
+			PR_SetError(PR_LOOP_ERROR, err);
+			break;
+		case ETIMEDOUT:
+			PR_SetError(PR_REMOTE_FILE_ERROR, err);
+			break;
+		case ENAMETOOLONG:
+			PR_SetError(PR_NAME_TOO_LONG_ERROR, err);
+			break;
+		case ENOENT:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case ENOTDIR:
+			PR_SetError(PR_NOT_DIRECTORY_ERROR, err);
+			break;
+		case EROFS:
+			PR_SetError(PR_READ_ONLY_FILESYSTEM_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_read_error(int err)
+{
+	switch (err) {
+		case EACCES:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case EAGAIN:
+#if EWOULDBLOCK != EAGAIN
+		case EWOULDBLOCK:
+#endif
+			PR_SetError(PR_WOULD_BLOCK_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+#ifdef EBADMSG
+		case EBADMSG:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+#endif
+		case EDEADLK:
+			PR_SetError(PR_DEADLOCK_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case EINVAL:
+			PR_SetError(PR_INVALID_METHOD_ERROR, err);
+			break;
+		case EIO:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case ENOLCK:
+			PR_SetError(PR_FILE_IS_LOCKED_ERROR, err);
+			break;
+		case ENXIO:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		case EISDIR:
+			PR_SetError(PR_IS_DIRECTORY_ERROR, err);
+			break;
+		case ECONNRESET:
+		case EPIPE:
+			PR_SetError(PR_CONNECT_RESET_ERROR, err);
+			break;
+#ifdef ENOLINK
+		case ENOLINK:
+			PR_SetError(PR_REMOTE_FILE_ERROR, err);
+			break;
+#endif
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_write_error(int err)
+{
+	switch (err) {
+		case EAGAIN:
+#if EWOULDBLOCK != EAGAIN
+		case EWOULDBLOCK:
+#endif
+			PR_SetError(PR_WOULD_BLOCK_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case EDEADLK:
+			PR_SetError(PR_DEADLOCK_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EFBIG:
+			PR_SetError(PR_FILE_TOO_BIG_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case EINVAL:
+			PR_SetError(PR_INVALID_METHOD_ERROR, err);
+			break;
+		case EIO:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case ENOLCK:
+			PR_SetError(PR_FILE_IS_LOCKED_ERROR, err);
+			break;
+#ifdef ENOSR
+		case ENOSR:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+#endif
+		case ENOSPC:
+			PR_SetError(PR_NO_DEVICE_SPACE_ERROR, err);
+			break;
+		case ENXIO:
+			PR_SetError(PR_INVALID_METHOD_ERROR, err);
+			break;
+		case ERANGE:
+			PR_SetError(PR_INVALID_METHOD_ERROR, err);
+			break;
+		case ETIMEDOUT:
+			PR_SetError(PR_REMOTE_FILE_ERROR, err);
+			break;
+		case ECONNRESET:
+		case EPIPE:
+			PR_SetError(PR_CONNECT_RESET_ERROR, err);
+			break;
+#ifdef EDQUOT
+		case EDQUOT:
+			PR_SetError(PR_NO_DEVICE_SPACE_ERROR, err);
+			break;
+#endif
+#ifdef ENOLINK
+		case ENOLINK:
+			PR_SetError(PR_REMOTE_FILE_ERROR, err);
+			break;
+#endif
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_lseek_error(int err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ESPIPE:
+			PR_SetError(PR_INVALID_METHOD_ERROR, err);
+			break;
+		case EINVAL:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_fsync_error(int err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+#ifdef ENOLINK
+		case ENOLINK:
+#endif
+		case ETIMEDOUT:
+			PR_SetError(PR_REMOTE_FILE_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case EIO:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case EINVAL:
+			PR_SetError(PR_INVALID_METHOD_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_close_error(int err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+#ifdef ENOLINK
+		case ENOLINK:
+#endif
+		case ETIMEDOUT:
+			PR_SetError(PR_REMOTE_FILE_ERROR, err);
+			break;
+		case EIO:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_socket_error(int err)
+{
+	switch (err) {
+		case EPROTONOSUPPORT:
+			PR_SetError(PR_PROTOCOL_NOT_SUPPORTED_ERROR, err);
+			break;
+		case EMFILE:
+			PR_SetError(PR_PROC_DESC_TABLE_FULL_ERROR, err);
+			break;
+		case ENFILE:
+			PR_SetError(PR_SYS_DESC_TABLE_FULL_ERROR, err);
+			break;
+		case EACCES:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+#if !defined(SCO)
+		case ENOBUFS:
+#endif /* !defined(SCO) */
+		case ENOMEM:
+#ifdef ENOSR
+		case ENOSR:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+#endif
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_socketavailable_error(int err)
+{
+	PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+}
+
+void _MD_unix_map_recv_error(int err)
+{
+	switch (err) {
+		case EAGAIN:
+#if EWOULDBLOCK != EAGAIN
+		case EWOULDBLOCK:
+#endif
+			PR_SetError(PR_WOULD_BLOCK_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+#if !defined(BEOS)
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#endif
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ENOMEM:
+			PR_SetError(PR_OUT_OF_MEMORY_ERROR, err);
+			break;
+		case ECONNRESET:
+		case EPIPE:
+			PR_SetError(PR_CONNECT_RESET_ERROR, err);
+			break;
+#ifdef ENOSR
+		case ENOSR:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+#endif
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_recvfrom_error(int err)
+{
+	switch (err) {
+		case EAGAIN:
+#if EWOULDBLOCK != EAGAIN
+		case EWOULDBLOCK:
+#endif
+			PR_SetError(PR_WOULD_BLOCK_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+#if !defined(BEOS)
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#endif
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ENOMEM:
+			PR_SetError(PR_OUT_OF_MEMORY_ERROR, err);
+			break;
+#ifdef ENOSR
+		case ENOSR:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+#endif
+		case ECONNRESET:
+			PR_SetError(PR_CONNECT_RESET_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_send_error(int err)
+{
+	switch (err) {
+		case EAGAIN:
+#if EWOULDBLOCK != EAGAIN
+		case EWOULDBLOCK:
+#endif
+			PR_SetError(PR_WOULD_BLOCK_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+#if !defined(BEOS)
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#endif
+#if !defined(BEOS)
+		case EMSGSIZE:
+#endif
+		case EINVAL:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+#if !defined(SCO)
+		case ENOBUFS:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+#endif /* !defined(SCO) */
+		case ECONNREFUSED:
+			PR_SetError(PR_CONNECT_REFUSED_ERROR, err);
+			break;
+		case EISCONN:
+			PR_SetError(PR_IS_CONNECTED_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case ENOMEM:
+			PR_SetError(PR_OUT_OF_MEMORY_ERROR, err);
+			break;
+#ifdef ENOSR
+		case ENOSR:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+#endif
+		case ECONNRESET:
+		case EPIPE:
+			PR_SetError(PR_CONNECT_RESET_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_sendto_error(int err)
+{
+	switch (err) {
+		case EAGAIN:
+#if EWOULDBLOCK != EAGAIN
+		case EWOULDBLOCK:
+#endif
+			PR_SetError(PR_WOULD_BLOCK_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+#if !defined(BEOS)
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#endif
+#if !defined(BEOS)
+		case EMSGSIZE:
+#endif
+		case EINVAL:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+#if !defined(SCO)
+		case ENOBUFS:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+#endif /* !defined(SCO) */
+		case ECONNREFUSED:
+			PR_SetError(PR_CONNECT_REFUSED_ERROR, err);
+			break;
+		case EISCONN:
+			PR_SetError(PR_IS_CONNECTED_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case ENOMEM:
+			PR_SetError(PR_OUT_OF_MEMORY_ERROR, err);
+			break;
+#ifdef ENOSR
+		case ENOSR:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+#endif
+		case ECONNRESET:
+		case EPIPE:
+			PR_SetError(PR_CONNECT_RESET_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_writev_error(int err)
+{
+	switch (err) {
+		case EAGAIN:
+#if EWOULDBLOCK != EAGAIN
+		case EWOULDBLOCK:
+#endif
+			PR_SetError(PR_WOULD_BLOCK_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+#ifdef ENOSR
+		case ENOSR:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+#endif
+		case EINVAL:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		case ECONNRESET:
+		case EPIPE:
+			PR_SetError(PR_CONNECT_RESET_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_accept_error(int err)
+{
+	switch (err) {
+		case EAGAIN:
+#if EWOULDBLOCK != EAGAIN
+		case EWOULDBLOCK:
+#endif
+			PR_SetError(PR_WOULD_BLOCK_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+#if !defined(BEOS)
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#endif
+#if !defined(BEOS)
+		case EOPNOTSUPP:
+#endif
+		case ENODEV:
+			PR_SetError(PR_NOT_TCP_SOCKET_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EMFILE:
+			PR_SetError(PR_PROC_DESC_TABLE_FULL_ERROR, err);
+			break;
+		case ENFILE:
+			PR_SetError(PR_SYS_DESC_TABLE_FULL_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case ENOMEM:
+			PR_SetError(PR_OUT_OF_MEMORY_ERROR, err);
+			break;
+#ifdef ENOSR
+		case ENOSR:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+#endif
+#ifdef EPROTO
+		case EPROTO:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+#endif
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_connect_error(int err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case EADDRNOTAVAIL:
+			PR_SetError(PR_ADDRESS_NOT_AVAILABLE_ERROR, err);
+			break;
+		case EINPROGRESS:
+			PR_SetError(PR_IN_PROGRESS_ERROR, err);
+			break;
+		case EALREADY:
+			PR_SetError(PR_ALREADY_INITIATED_ERROR, err);
+			break;
+#if !defined(BEOS)
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#endif
+		case EAFNOSUPPORT:
+			PR_SetError(PR_ADDRESS_NOT_SUPPORTED_ERROR, err);
+			break;
+		case EISCONN:
+			PR_SetError(PR_IS_CONNECTED_ERROR, err);
+			break;
+		case ETIMEDOUT:
+			PR_SetError(PR_IO_TIMEOUT_ERROR, err);
+			break;
+		case ECONNREFUSED:
+			PR_SetError(PR_CONNECT_REFUSED_ERROR, err);
+			break;
+		case ENETUNREACH:
+			PR_SetError(PR_NETWORK_UNREACHABLE_ERROR, err);
+			break;
+		case EADDRINUSE:
+			PR_SetError(PR_ADDRESS_IN_USE_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		/*
+		 * UNIX domain sockets are not supported in NSPR
+		 */
+		case EACCES:
+			PR_SetError(PR_ADDRESS_NOT_SUPPORTED_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case EINVAL:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		case EIO:
+#if defined(UNIXWARE)
+			/*
+			 * On some platforms, if we connect to a port on
+			 * the local host (the loopback address) that no
+			 * process is listening on, we get EIO instead
+			 * of ECONNREFUSED.
+			 */
+			PR_SetError(PR_CONNECT_REFUSED_ERROR, err);
+#else
+			PR_SetError(PR_IO_ERROR, err);
+#endif
+			break;
+		case ELOOP:
+			PR_SetError(PR_ADDRESS_NOT_SUPPORTED_ERROR, err);
+			break;
+		case ENOENT:
+			PR_SetError(PR_ADDRESS_NOT_SUPPORTED_ERROR, err);
+			break;
+#ifdef ENOSR
+		case ENOSR:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+#endif
+		case ENXIO:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case EPROTOTYPE:
+			PR_SetError(PR_ADDRESS_NOT_SUPPORTED_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_bind_error(int err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+#if !defined(BEOS)
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#endif
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EADDRNOTAVAIL:
+			PR_SetError(PR_ADDRESS_NOT_AVAILABLE_ERROR, err);
+			break;
+		case EADDRINUSE:
+			PR_SetError(PR_ADDRESS_IN_USE_ERROR, err);
+			break;
+		case EACCES:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case EINVAL:
+			PR_SetError(PR_SOCKET_ADDRESS_IS_BOUND_ERROR, err);
+			break;
+#ifdef ENOSR
+		case ENOSR:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+#endif
+		/*
+		 * UNIX domain sockets are not supported in NSPR
+		 */
+		case EIO:
+		case EISDIR:
+		case ELOOP:
+		case ENOENT:
+		case ENOTDIR:
+		case EROFS:
+			PR_SetError(PR_ADDRESS_NOT_SUPPORTED_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_listen_error(int err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+#if !defined(BEOS)
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#endif
+#if !defined(BEOS)
+		case EOPNOTSUPP:
+			PR_SetError(PR_NOT_TCP_SOCKET_ERROR, err);
+			break;
+#endif
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_shutdown_error(int err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+#if !defined(BEOS)
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#endif
+		case ENOTCONN:
+			PR_SetError(PR_NOT_CONNECTED_ERROR, err);
+			break;
+		case ENOMEM:
+			PR_SetError(PR_OUT_OF_MEMORY_ERROR, err);
+			break;
+#ifdef ENOSR
+		case ENOSR:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+#endif
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_socketpair_error(int err)
+{
+	switch (err) {
+		case EMFILE:
+			PR_SetError(PR_PROC_DESC_TABLE_FULL_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ENOMEM:
+#ifdef ENOSR
+		case ENOSR:
+#endif
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		case EAFNOSUPPORT:
+		case EPROTONOSUPPORT:
+#if !defined(BEOS)
+		case EOPNOTSUPP:
+#endif
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_getsockname_error(int err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+#if !defined(BEOS)
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#endif
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+#if !defined(SCO)
+		case ENOBUFS:
+#endif /* !defined(SCO) */
+		case ENOMEM:
+#ifdef ENOSR
+		case ENOSR:
+#endif
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_getpeername_error(int err)
+{
+
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+#if !defined(BEOS)
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#endif
+		case ENOTCONN:
+			PR_SetError(PR_NOT_CONNECTED_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+#if !defined(SCO)
+		case ENOBUFS:
+#endif /* !defined(SCO) */
+		case ENOMEM:
+#ifdef ENOSR
+		case ENOSR:
+#endif
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_getsockopt_error(int err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+#if !defined(BEOS)
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#endif
+		case ENOPROTOOPT:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EINVAL:
+			PR_SetError(PR_BUFFER_OVERFLOW_ERROR, err);
+			break;
+		case ENOMEM:
+#ifdef ENOSR
+		case ENOSR:
+#endif
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_setsockopt_error(int err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+#if !defined(BEOS)
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#endif
+		case ENOPROTOOPT:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EINVAL:
+			PR_SetError(PR_BUFFER_OVERFLOW_ERROR, err);
+			break;
+		case ENOMEM:
+#ifdef ENOSR
+		case ENOSR:
+#endif
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_open_error(int err)
+{
+	switch (err) {
+		case EACCES:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case EAGAIN:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		case EBUSY:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case EEXIST:
+			PR_SetError(PR_FILE_EXISTS_ERROR, err);
+			break;
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case EINVAL:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		case EIO:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case EISDIR:
+			PR_SetError(PR_IS_DIRECTORY_ERROR, err);
+			break;
+		case ELOOP:
+			PR_SetError(PR_LOOP_ERROR, err);
+			break;
+		case EMFILE:
+			PR_SetError(PR_PROC_DESC_TABLE_FULL_ERROR, err);
+			break;
+		case ENAMETOOLONG:
+			PR_SetError(PR_NAME_TOO_LONG_ERROR, err);
+			break;
+		case ENFILE:
+			PR_SetError(PR_SYS_DESC_TABLE_FULL_ERROR, err);
+			break;
+		case ENODEV:
+		case ENOENT:
+		case ENXIO:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case ENOMEM:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		case ENOSPC:
+			PR_SetError(PR_NO_DEVICE_SPACE_ERROR, err);
+			break;
+#ifdef ENOSR
+		case ENOSR:
+#endif
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		case ENOTDIR:
+			PR_SetError(PR_NOT_DIRECTORY_ERROR, err);
+			break;
+		case EPERM:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case ETIMEDOUT:
+			PR_SetError(PR_REMOTE_FILE_ERROR, err);
+			break;
+		case EROFS:
+			PR_SetError(PR_READ_ONLY_FILESYSTEM_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_mmap_error(int err)
+{
+
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case EAGAIN:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		case EACCES:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case ENOMEM:
+			PR_SetError(PR_OUT_OF_MEMORY_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_unix_map_gethostname_error(int err)
+{
+    switch (err) {
+		case EFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+    }
+}
+
+void _MD_unix_map_select_error(int err)
+{
+    switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case EINTR:
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, err);
+			break;
+		case EINVAL:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+    }
+}
+
+void _MD_unix_map_poll_error(int err)
+{
+    PRErrorCode prerror;
+    switch (err) {
+        case EAGAIN:
+            prerror = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        case EINVAL:
+            prerror = PR_INVALID_ARGUMENT_ERROR;
+            break;
+        case EFAULT:
+            prerror = PR_ACCESS_FAULT_ERROR;
+            break;
+        default:
+            prerror = PR_UNKNOWN_ERROR;
+            break;
+    }
+    PR_SetError(prerror, err);
+}
+
+void _MD_unix_map_flock_error(int err)
+{
+    switch (err) {
+		case EBADF:
+		case EINVAL:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case EWOULDBLOCK:
+			PR_SetError(PR_FILE_IS_LOCKED_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+    }
+}
+
+void _MD_unix_map_lockf_error(int err)
+{
+    switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case EACCES:
+			PR_SetError(PR_FILE_IS_LOCKED_ERROR, err);
+			break;
+		case EDEADLK:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+    }
+}
+
+#ifdef HPUX11
+void _MD_hpux_map_sendfile_error(int oserror)
+{
+    PRErrorCode prerror;
+
+    switch (oserror) {
+        case ENOTSOCK:
+            prerror = PR_NOT_SOCKET_ERROR;
+            break;
+        case EFAULT:
+            prerror = PR_ACCESS_FAULT_ERROR;
+            break;
+        case ENOBUFS:
+            prerror = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        case EINVAL:
+            prerror = PR_INVALID_ARGUMENT_ERROR;
+            break;
+        case ENOTCONN:
+            prerror = PR_NOT_CONNECTED_ERROR;
+            break;
+        case EPIPE:
+            prerror = PR_CONNECT_RESET_ERROR;
+            break;
+        case ENOMEM:
+            prerror = PR_OUT_OF_MEMORY_ERROR;
+            break;
+        case EOPNOTSUPP:
+            prerror = PR_NOT_TCP_SOCKET_ERROR;
+            break;
+        default:
+            prerror = PR_UNKNOWN_ERROR;
+    }
+    PR_SetError(prerror, oserror); 
+}
+#endif /* HPUX11 */
diff --git a/nsprpub/pr/src/md/beos/bfile.c b/nsprpub/pr/src/md/beos/bfile.c
new file mode 100644
index 000000000..89fea29a2
--- /dev/null
+++ b/nsprpub/pr/src/md/beos/bfile.c
@@ -0,0 +1,873 @@
+/* -*- Mode: C++; tab-width: 8; c-basic-offset: 8 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+/*
+** Global lock variable used to bracket calls into rusty libraries that
+** aren't thread safe (like libc, libX, etc).
+*/
+static PRLock *_pr_rename_lock = NULL; 
+
+void
+_MD_InitIO (void)
+{
+}
+
+PRStatus
+_MD_open_dir (_MDDir *md,const char *name)
+{
+int err;
+
+	md->d = opendir(name);
+	if (!md->d) {
+		err = _MD_ERRNO();
+		_PR_MD_MAP_OPENDIR_ERROR(err);
+		return PR_FAILURE;
+	}
+	return PR_SUCCESS;
+}
+
+char*
+_MD_read_dir (_MDDir *md, PRIntn flags)
+{
+struct dirent *de;
+int err;
+
+	for (;;) {
+		/*
+		 * XXX: readdir() is not MT-safe
+		 */
+		_MD_ERRNO() = 0;
+		de = readdir(md->d);
+
+		if (!de) {
+			err = _MD_ERRNO();
+			_PR_MD_MAP_READDIR_ERROR(err);
+			return 0;
+		}
+
+		if ((flags & PR_SKIP_DOT) &&
+		    (de->d_name[0] == '.') && (de->d_name[1] == 0))
+			continue;
+
+		if ((flags & PR_SKIP_DOT_DOT) &&
+		    (de->d_name[0] == '.') && (de->d_name[1] == '.') &&
+		    (de->d_name[2] == 0))
+			continue;
+
+		if ((flags & PR_SKIP_HIDDEN) && (de->d_name[1] == '.'))
+			continue;
+
+		break;
+	}
+	return de->d_name;
+}
+
+
+PRInt32
+_MD_close_dir (_MDDir *md)
+{
+int rv = 0, err;
+
+	if (md->d) {
+		rv = closedir(md->d);
+		if (rv == -1) {
+			err = _MD_ERRNO();
+			_PR_MD_MAP_CLOSEDIR_ERROR(err);
+		}
+	}
+	return(rv);
+}
+
+void
+_MD_make_nonblock (PRFileDesc *fd)
+{
+	int blocking = 1;
+	setsockopt(fd->secret->md.osfd, SOL_SOCKET, SO_NONBLOCK, &blocking, sizeof(blocking));
+
+}
+
+PRStatus
+_MD_set_fd_inheritable (PRFileDesc *fd, PRBool inheritable)
+{
+        int rv;
+	
+        rv = fcntl(fd->secret->md.osfd, F_SETFD, inheritable ? 0 : FD_CLOEXEC);
+        if (-1 == rv) {
+                PR_SetError(PR_UNKNOWN_ERROR, _MD_ERRNO());
+                return PR_FAILURE;
+        }
+        return PR_SUCCESS;
+}
+
+void
+_MD_init_fd_inheritable (PRFileDesc *fd, PRBool imported)
+{
+	if (imported) {
+		fd->secret->inheritable = _PR_TRI_UNKNOWN;
+	} else {
+		int flags = fcntl(fd->secret->md.osfd, F_GETFD, 0);
+		if (flags == -1) {
+			PR_SetError(PR_UNKNOWN_ERROR, _MD_ERRNO());
+			return;
+		}
+		fd->secret->inheritable = (flags & FD_CLOEXEC) ? 
+			_PR_TRI_TRUE : _PR_TRI_FALSE;
+	}
+}
+
+void
+_MD_query_fd_inheritable (PRFileDesc *fd)
+{
+	int flags;
+	
+	PR_ASSERT(_PR_TRI_UNKNOWN == fd->secret->inheritable);
+	flags = fcntl(fd->secret->md.osfd, F_GETFD, 0);
+	PR_ASSERT(-1 != flags);
+	fd->secret->inheritable = (flags & FD_CLOEXEC) ?
+		_PR_TRI_FALSE : _PR_TRI_TRUE;
+}
+
+PRInt32
+_MD_open (const char *name, PRIntn flags, PRIntn mode)
+{
+	PRInt32 osflags;
+	PRInt32 rv, err;
+
+	if (flags & PR_RDWR) {
+		osflags = O_RDWR;
+	} else if (flags & PR_WRONLY) {
+		osflags = O_WRONLY;
+	} else {
+		osflags = O_RDONLY;
+	}
+
+	if (flags & PR_EXCL)
+		osflags |= O_EXCL;
+	if (flags & PR_APPEND)
+		osflags |= O_APPEND;
+	if (flags & PR_TRUNCATE)
+		osflags |= O_TRUNC;
+	if (flags & PR_SYNC) {
+/* Ummmm.  BeOS doesn't appear to
+   support sync in any way shape or
+   form. */
+		return PR_NOT_IMPLEMENTED_ERROR;
+	}
+
+	/*
+	** On creations we hold the 'create' lock in order to enforce
+	** the semantics of PR_Rename. (see the latter for more details)
+	*/
+	if (flags & PR_CREATE_FILE)
+	{
+		osflags |= O_CREAT ;
+		if (NULL !=_pr_rename_lock)
+		    PR_Lock(_pr_rename_lock);
+	}
+
+        rv = open(name, osflags, mode);
+
+        if (rv < 0) {
+                err = _MD_ERRNO();
+                _PR_MD_MAP_OPEN_ERROR(err);
+        }                                                                      
+
+    if ((flags & PR_CREATE_FILE) && (NULL !=_pr_rename_lock))
+        PR_Unlock(_pr_rename_lock);
+        return rv;
+}
+
+PRInt32
+_MD_close_file (PRInt32 osfd)
+{
+PRInt32 rv, err;
+
+	rv = close(osfd);
+	if (rv == -1) {
+		err = _MD_ERRNO();
+		_PR_MD_MAP_CLOSE_ERROR(err);
+	}
+	return(rv);
+}
+
+PRInt32
+_MD_read (PRFileDesc *fd, void *buf, PRInt32 amount)
+{
+    PRInt32 rv, err;
+    PRInt32 osfd = fd->secret->md.osfd;
+
+    rv = read( osfd, buf, amount );
+    if (rv < 0) {
+	err = _MD_ERRNO();
+	_PR_MD_MAP_READ_ERROR(err);
+    }
+    return(rv);
+}
+
+PRInt32
+_MD_write (PRFileDesc *fd, const void *buf, PRInt32 amount)
+{
+    PRInt32 rv, err;
+    PRInt32 osfd = fd->secret->md.osfd;
+
+    rv = write( osfd, buf, amount );
+
+    if( rv < 0 ) {
+
+	err = _MD_ERRNO();
+	_PR_MD_MAP_WRITE_ERROR(err);
+    }
+    return( rv );
+}
+
+#ifndef BONE_VERSION /* Writev moves to bnet.c with BONE */
+PRInt32
+_MD_writev (PRFileDesc *fd, const PRIOVec *iov, PRInt32 iov_size,
+	    PRIntervalTime timeout)
+{
+    return PR_NOT_IMPLEMENTED_ERROR;
+}
+#endif
+
+PRInt32
+_MD_lseek (PRFileDesc *fd, PRInt32 offset, int whence)
+{
+PRInt32 rv, err;
+
+    rv = lseek (fd->secret->md.osfd, offset, whence);
+    if (rv == -1) {
+        err = _MD_ERRNO();
+	_PR_MD_MAP_LSEEK_ERROR(err);
+    }
+    return( rv );
+}
+
+PRInt64
+_MD_lseek64 (PRFileDesc *fd, PRInt64 offset, int whence)
+{
+PRInt32 rv, err;
+
+/* According to the BeOS headers, lseek accepts a
+ * variable of type off_t for the offset, and off_t
+ * is defined to be a 64-bit value.  So no special
+ * cracking needs to be done on "offset".
+ */
+
+    rv = lseek (fd->secret->md.osfd, offset, whence);
+    if (rv == -1) {
+        err = _MD_ERRNO();
+	_PR_MD_MAP_LSEEK_ERROR(err);
+    }
+    return( rv );
+}
+
+PRInt32
+_MD_fsync (PRFileDesc *fd)
+{
+PRInt32 rv, err;
+
+    rv = fsync(fd->secret->md.osfd);
+    if (rv == -1) {
+	err = _MD_ERRNO();
+	_PR_MD_MAP_FSYNC_ERROR(err);
+    }
+    return(rv);
+}
+
+PRInt32
+_MD_delete (const char *name)
+{
+PRInt32 rv, err;
+
+    rv = unlink(name);
+    if (rv == -1)
+    {
+	err = _MD_ERRNO();
+        _PR_MD_MAP_UNLINK_ERROR(err);
+    }
+    return (rv);
+}
+
+PRInt32
+_MD_getfileinfo (const char *fn, PRFileInfo *info)
+{
+struct stat sb;
+PRInt32 rv, err;
+PRInt64 s, s2us;
+
+	rv = stat(fn, &sb);
+	if (rv < 0) {
+		err = _MD_ERRNO();
+		_PR_MD_MAP_STAT_ERROR(err);
+	} else if (info) {
+		if (S_IFREG & sb.st_mode)
+			info->type = PR_FILE_FILE;
+		else if (S_IFDIR & sb.st_mode)
+			info->type = PR_FILE_DIRECTORY;
+		else
+			info->type = PR_FILE_OTHER;
+
+		/* Must truncate file size for the 32 bit
+		   version */
+		info->size = (sb.st_size & 0xffffffff);
+		LL_I2L(s, sb.st_mtime);
+		LL_I2L(s2us, PR_USEC_PER_SEC);
+		LL_MUL(s, s, s2us);
+		info->modifyTime = s;
+		LL_I2L(s, sb.st_ctime);
+		LL_MUL(s, s, s2us);
+		info->creationTime = s;
+	}
+	return rv;
+}
+
+PRInt32
+_MD_getfileinfo64 (const char *fn, PRFileInfo64 *info)
+{
+struct stat sb;
+PRInt32 rv, err;
+PRInt64 s, s2us;
+
+	rv = stat(fn, &sb);
+	if (rv < 0) {
+		err = _MD_ERRNO();
+		_PR_MD_MAP_STAT_ERROR(err);
+	} else if (info) {
+		if (S_IFREG & sb.st_mode)
+			info->type = PR_FILE_FILE;
+		else if (S_IFDIR & sb.st_mode)
+			info->type = PR_FILE_DIRECTORY;
+		else
+			info->type = PR_FILE_OTHER;
+	
+		/* For the 64 bit version we can use
+		 * the native st_size without modification
+		 */
+		info->size = sb.st_size;
+		LL_I2L(s, sb.st_mtime);
+		LL_I2L(s2us, PR_USEC_PER_SEC);
+		LL_MUL(s, s, s2us);
+		info->modifyTime = s;
+		LL_I2L(s, sb.st_ctime);
+		LL_MUL(s, s, s2us);
+		info->creationTime = s;
+	}
+	return rv;
+}
+
+PRInt32
+_MD_getopenfileinfo (const PRFileDesc *fd, PRFileInfo *info)
+{
+        struct stat sb;
+        PRInt64 s, s2us;
+        PRInt32 rv, err;
+
+        rv = fstat(fd->secret->md.osfd, &sb);
+        if (rv < 0) {
+                        err = _MD_ERRNO();
+                        _PR_MD_MAP_FSTAT_ERROR(err);
+        } else if (info) {
+                if (info) {
+                        if (S_IFREG & sb.st_mode)
+                                info->type = PR_FILE_FILE ;
+                        else if (S_IFDIR & sb.st_mode)
+                                info->type = PR_FILE_DIRECTORY;
+                        else
+                                info->type = PR_FILE_OTHER;
+			/* Use lower 32 bits of file size */
+                        info->size = ( sb.st_size & 0xffffffff);
+                        LL_I2L(s, sb.st_mtime);
+                        LL_I2L(s2us, PR_USEC_PER_SEC);
+                        LL_MUL(s, s, s2us);
+                        info->modifyTime = s;
+                        LL_I2L(s, sb.st_ctime);
+                        LL_MUL(s, s, s2us);
+                        info->creationTime = s;
+                }
+        }
+        return rv;
+}
+
+PRInt32
+_MD_getopenfileinfo64 (const PRFileDesc *fd, PRFileInfo64 *info)
+{
+        struct stat sb;
+        PRInt64 s, s2us;
+        PRInt32 rv, err;
+
+        rv = fstat(fd->secret->md.osfd, &sb);
+        if (rv < 0) {
+                        err = _MD_ERRNO();
+                        _PR_MD_MAP_FSTAT_ERROR(err);
+        } else if (info) {
+                if (info) {
+                        if (S_IFREG & sb.st_mode)
+                                info->type = PR_FILE_FILE ;
+                        else if (S_IFDIR & sb.st_mode)
+                                info->type = PR_FILE_DIRECTORY;
+                        else
+                                info->type = PR_FILE_OTHER;
+                        info->size = sb.st_size;
+                        LL_I2L(s, sb.st_mtime);
+                        LL_I2L(s2us, PR_USEC_PER_SEC);
+                        LL_MUL(s, s, s2us);
+                        info->modifyTime = s;
+                        LL_I2L(s, sb.st_ctime);
+                        LL_MUL(s, s, s2us);
+                        info->creationTime = s;
+                }
+        }
+        return rv;
+}
+
+PRInt32
+_MD_rename (const char *from, const char *to)
+{
+    PRInt32 rv = -1, err;
+
+    /*
+    ** This is trying to enforce the semantics of WINDOZE' rename
+    ** operation. That means one is not allowed to rename over top
+    ** of an existing file. Holding a lock across these two function
+    ** and the open function is known to be a bad idea, but ....
+    */
+    if (NULL != _pr_rename_lock)
+        PR_Lock(_pr_rename_lock);
+    if (0 == access(to, F_OK))
+        PR_SetError(PR_FILE_EXISTS_ERROR, 0);
+    else
+    {
+            rv = rename(from, to);
+            if (rv < 0) {
+                    err = _MD_ERRNO();
+                    _PR_MD_MAP_RENAME_ERROR(err);
+            }
+    }
+    if (NULL != _pr_rename_lock)
+        PR_Unlock(_pr_rename_lock);
+    return rv; 
+}
+
+PRInt32
+_MD_access (const char *name, PRIntn how)
+{
+PRInt32 rv, err;
+int checkFlags;
+struct stat buf;
+
+	switch (how) {
+		case PR_ACCESS_WRITE_OK:
+			checkFlags = S_IWUSR | S_IWGRP | S_IWOTH;
+			break;
+		
+		case PR_ACCESS_READ_OK:
+			checkFlags = S_IRUSR | S_IRGRP | S_IROTH;
+			break;
+		
+		case PR_ACCESS_EXISTS:
+			/* we don't need to examine st_mode. */
+			break;
+		
+		default:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+			return -1;
+	}
+
+	rv = stat(name, &buf);
+	if (rv == 0 && how != PR_ACCESS_EXISTS && (!(buf.st_mode & checkFlags))) {
+		PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, 0);
+		return -1;
+	}
+
+	if (rv < 0) {
+		err = _MD_ERRNO();
+		_PR_MD_MAP_STAT_ERROR(err);
+	}
+
+	return(rv);
+}
+
+PRInt32
+_MD_stat (const char *name, struct stat *buf)
+{
+    return PR_NOT_IMPLEMENTED_ERROR;
+}
+
+PRInt32
+_MD_mkdir (const char *name, PRIntn mode)
+{
+    status_t rv;
+    int err;
+
+    /*
+    ** This lock is used to enforce rename semantics as described
+    ** in PR_Rename. Look there for more fun details.
+    */
+    if (NULL !=_pr_rename_lock)
+        PR_Lock(_pr_rename_lock);
+
+    rv = mkdir(name, mode);
+    if (rv < 0) {
+	err = _MD_ERRNO();
+	_PR_MD_MAP_MKDIR_ERROR(err);
+    }
+    if (NULL !=_pr_rename_lock)
+        PR_Unlock(_pr_rename_lock);
+    return rv; 
+}
+
+PRInt32
+_MD_rmdir (const char *name)
+{
+int rv, err;
+
+        rv = rmdir(name);
+        if (rv == -1) {
+                        err = _MD_ERRNO();
+                        _PR_MD_MAP_RMDIR_ERROR(err);
+        }
+        return rv;
+}
+
+PRInt32
+_MD_pr_poll(PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
+{
+	PRInt32 rv = 0;
+	PRThread *me = _PR_MD_CURRENT_THREAD();
+	/*
+	 * This code is almost a duplicate of w32poll.c's _PR_MD_PR_POLL().
+	 */
+	fd_set rd, wt, ex;
+	PRFileDesc *bottom;
+	PRPollDesc *pd, *epd;
+	PRInt32 maxfd = -1, ready, err;
+	PRIntervalTime remaining, elapsed, start;
+
+	struct timeval tv, *tvp = NULL;
+
+	if (_PR_PENDING_INTERRUPT(me))
+	{
+		me->flags &= ~_PR_INTERRUPT;
+		PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+		return -1;
+	}
+
+	if (0 == npds) {
+		PR_Sleep(timeout);
+		return rv;
+	}
+
+	FD_ZERO(&rd);
+	FD_ZERO(&wt);
+	FD_ZERO(&ex);
+
+	ready = 0;
+	for (pd = pds, epd = pd + npds; pd < epd; pd++)
+	{
+		PRInt16 in_flags_read = 0, in_flags_write = 0;
+		PRInt16 out_flags_read = 0, out_flags_write = 0; 
+		
+		if ((NULL != pd->fd) && (0 != pd->in_flags))
+		{
+			if (pd->in_flags & PR_POLL_READ)
+			{
+				in_flags_read = (pd->fd->methods->poll)(pd->fd, pd->in_flags & ~PR_POLL_WRITE, &out_flags_read);
+			}
+			if (pd->in_flags & PR_POLL_WRITE)
+			{
+				in_flags_write = (pd->fd->methods->poll)(pd->fd, pd->in_flags & ~PR_POLL_READ, &out_flags_write);
+			}
+			if ((0 != (in_flags_read & out_flags_read))
+			    || (0 != (in_flags_write & out_flags_write)))
+			{
+				/* this one's ready right now */
+				if (0 == ready)
+				{
+					/*
+					 * We will have to return without calling the
+					 * system poll/select function.  So zero the
+					 * out_flags fields of all the poll descriptors
+					 * before this one. 
+					 */
+					PRPollDesc *prev;
+					for (prev = pds; prev < pd; prev++)
+					{
+						prev->out_flags = 0;
+					}
+				}
+				ready += 1;
+				pd->out_flags = out_flags_read | out_flags_write;
+			}
+			else
+			{
+				pd->out_flags = 0;  /* pre-condition */
+				
+				/* make sure this is an NSPR supported stack */
+				bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+				PR_ASSERT(NULL != bottom);  /* what to do about that? */
+				if ((NULL != bottom)
+				    && (_PR_FILEDESC_OPEN == bottom->secret->state))
+				{
+					if (0 == ready)
+					{
+						PRInt32 osfd = bottom->secret->md.osfd; 
+						if (osfd > maxfd) maxfd = osfd;
+						if (in_flags_read & PR_POLL_READ)
+						{
+							pd->out_flags |= _PR_POLL_READ_SYS_READ;
+							FD_SET(osfd, &rd);
+						}
+						if (in_flags_read & PR_POLL_WRITE)
+						{
+							pd->out_flags |= _PR_POLL_READ_SYS_WRITE;
+							FD_SET(osfd, &wt);
+						}
+						if (in_flags_write & PR_POLL_READ)
+						{
+							pd->out_flags |= _PR_POLL_WRITE_SYS_READ;
+							FD_SET(osfd, &rd);
+						}
+						if (in_flags_write & PR_POLL_WRITE)
+						{
+							pd->out_flags |= _PR_POLL_WRITE_SYS_WRITE;
+							FD_SET(osfd, &wt);
+						}
+						if (pd->in_flags & PR_POLL_EXCEPT) FD_SET(osfd, &ex);
+					}
+				}
+				else
+				{
+					if (0 == ready)
+					{
+						PRPollDesc *prev;
+						for (prev = pds; prev < pd; prev++)
+						{
+							prev->out_flags = 0;
+						}
+					}
+					ready += 1;  /* this will cause an abrupt return */
+					pd->out_flags = PR_POLL_NVAL;  /* bogii */
+				}
+			}
+		}
+		else
+		{
+			pd->out_flags = 0;
+		}
+	}
+
+	if (0 != ready) return ready;  /* no need to block */
+
+	remaining = timeout;
+	start = PR_IntervalNow(); 
+
+ retry:
+	if (timeout != PR_INTERVAL_NO_TIMEOUT)
+	{
+		PRInt32 ticksPerSecond = PR_TicksPerSecond();
+		tv.tv_sec = remaining / ticksPerSecond;
+		tv.tv_usec = PR_IntervalToMicroseconds( remaining % ticksPerSecond );
+		tvp = &tv;
+	}
+	
+	ready = _MD_SELECT(maxfd + 1, &rd, &wt, &ex, tvp);
+	
+	if (ready == -1 && errno == EINTR)
+	{
+		if (timeout == PR_INTERVAL_NO_TIMEOUT) goto retry;
+		else
+		{
+			elapsed = (PRIntervalTime) (PR_IntervalNow() - start);
+			if (elapsed > timeout) ready = 0;  /* timed out */
+			else
+			{
+				remaining = timeout - elapsed;
+				goto retry; 
+			}
+		}
+	} 
+
+	/*
+	** Now to unravel the select sets back into the client's poll
+	** descriptor list. Is this possibly an area for pissing away
+	** a few cycles or what?
+	*/
+	if (ready > 0)
+	{
+		ready = 0;
+		for (pd = pds, epd = pd + npds; pd < epd; pd++)
+		{
+			PRInt16 out_flags = 0;
+			if ((NULL != pd->fd) && (0 != pd->in_flags))
+			{
+				PRInt32 osfd;
+				bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+				PR_ASSERT(NULL != bottom);
+				
+				osfd = bottom->secret->md.osfd; 
+				
+				if (FD_ISSET(osfd, &rd))
+				{
+					if (pd->out_flags & _PR_POLL_READ_SYS_READ)
+						out_flags |= PR_POLL_READ;
+					if (pd->out_flags & _PR_POLL_WRITE_SYS_READ)
+						out_flags |= PR_POLL_WRITE;
+				}
+				if (FD_ISSET(osfd, &wt))
+				{
+					if (pd->out_flags & _PR_POLL_READ_SYS_WRITE)
+						out_flags |= PR_POLL_READ;
+					if (pd->out_flags & _PR_POLL_WRITE_SYS_WRITE)
+						out_flags |= PR_POLL_WRITE;
+				}
+				if (FD_ISSET(osfd, &ex)) out_flags |= PR_POLL_EXCEPT;
+
+/* Workaround for nonblocking connects under net_server */
+#ifndef BONE_VERSION 		
+				if (out_flags)
+				{
+					/* check if it is a pending connect */
+					int i = 0, j = 0;
+					PR_Lock( _connectLock );
+					for( i = 0; i < connectCount; i++ ) 
+					{
+						if(connectList[i].osfd == osfd)
+						{
+							int connectError;
+							int connectResult;
+					
+							connectResult = connect(connectList[i].osfd,
+							                        &connectList[i].addr,
+							                        connectList[i].addrlen);
+							connectError = errno;
+					
+							if(connectResult < 0 ) 
+							{
+								if(connectError == EINTR || connectError == EWOULDBLOCK ||
+					  		   connectError == EINPROGRESS || connectError == EALREADY)
+								{
+									break;
+								}
+							}
+					
+							if(i == (connectCount - 1))
+							{
+								connectList[i].osfd = -1;
+							} else {
+								for(j = i; j < connectCount; j++ )
+								{
+									memcpy( &connectList[j], &connectList[j+1],
+									        sizeof(connectList[j]));
+								}
+							}
+							connectCount--;
+					
+							bottom->secret->md.connectReturnValue = connectResult;
+							bottom->secret->md.connectReturnError = connectError;
+							bottom->secret->md.connectValueValid = PR_TRUE;
+							break;
+						}
+					}
+					PR_Unlock( _connectLock );
+				}
+#endif
+			}
+			pd->out_flags = out_flags;
+			if (out_flags) ready++;
+		}
+		PR_ASSERT(ready > 0);
+	}
+	else if (ready < 0)
+	{ 
+		err = _MD_ERRNO();
+		if (err == EBADF)
+		{
+			/* Find the bad fds */
+			ready = 0;
+			for (pd = pds, epd = pd + npds; pd < epd; pd++)
+			{
+				pd->out_flags = 0;
+				if ((NULL != pd->fd) && (0 != pd->in_flags))
+				{
+					bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+					if (fcntl(bottom->secret->md.osfd, F_GETFL, 0) == -1)
+					{
+						pd->out_flags = PR_POLL_NVAL;
+						ready++;
+					}
+				}
+			}
+			PR_ASSERT(ready > 0);
+		}
+		else _PR_MD_MAP_SELECT_ERROR(err);
+	}
+	
+	return ready;
+}  /* _MD_pr_poll */
+
+/*
+ * File locking.
+ */
+
+PRStatus
+_MD_lockfile (PRInt32 osfd)
+{
+    PRInt32 rv;
+    struct flock linfo;
+
+    linfo.l_type = 
+    linfo.l_whence = SEEK_SET;
+    linfo.l_start = 0;
+    linfo.l_len = 0;
+
+    rv = fcntl(osfd, F_SETLKW, &linfo);
+    if (rv == 0)
+	return PR_SUCCESS;
+
+    _PR_MD_MAP_FLOCK_ERROR(_MD_ERRNO());
+    return PR_FAILURE;
+}
+
+PRStatus
+_MD_tlockfile (PRInt32 osfd)
+{
+    PRInt32 rv;
+    struct flock linfo;
+
+    linfo.l_type = 
+    linfo.l_whence = SEEK_SET;
+    linfo.l_start = 0;
+    linfo.l_len = 0;
+
+    rv = fcntl(osfd, F_SETLK, &linfo);
+    if (rv == 0)
+	return PR_SUCCESS;
+
+    _PR_MD_MAP_FLOCK_ERROR(_MD_ERRNO());
+    return PR_FAILURE;
+}
+
+PRStatus
+_MD_unlockfile (PRInt32 osfd)
+{
+    PRInt32 rv;
+    struct flock linfo;
+
+    linfo.l_type = 
+    linfo.l_whence = SEEK_SET;
+    linfo.l_start = 0;
+    linfo.l_len = 0;
+
+    rv = fcntl(osfd, F_UNLCK, &linfo);
+
+    if (rv == 0)
+	return PR_SUCCESS;
+
+    _PR_MD_MAP_FLOCK_ERROR(_MD_ERRNO());
+    return PR_FAILURE;
+}
+
diff --git a/nsprpub/pr/src/md/beos/bmemory.c b/nsprpub/pr/src/md/beos/bmemory.c
new file mode 100644
index 000000000..fb906f0f9
--- /dev/null
+++ b/nsprpub/pr/src/md/beos/bmemory.c
@@ -0,0 +1,10 @@
+/* -*- Mode: C++; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+PR_EXTERN(void) _PR_MD_INIT_SEGS(void);
+PR_EXTERN(PRStatus) _PR_MD_ALLOC_SEGMENT(PRSegment *seg, PRUint32 size, void *vaddr);
+PR_EXTERN(void) _PR_MD_FREE_SEGMENT(PRSegment *seg);
diff --git a/nsprpub/pr/src/md/beos/bmisc.c b/nsprpub/pr/src/md/beos/bmisc.c
new file mode 100644
index 000000000..4bdad411e
--- /dev/null
+++ b/nsprpub/pr/src/md/beos/bmisc.c
@@ -0,0 +1,91 @@
+/* -*- Mode: C++; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+#include <stdlib.h>
+
+PRLock *_connectLock = NULL;
+
+#ifndef BONE_VERSION
+/* Workaround for nonblocking connects under net_server */
+PRUint32 connectCount = 0;
+ConnectListNode connectList[64];
+#endif
+                                   
+void
+_MD_cleanup_before_exit (void)
+{
+}
+
+void
+_MD_exit (PRIntn status)
+{
+    exit(status);
+}
+
+void
+_MD_early_init (void)
+{
+}
+
+static PRLock *monitor = NULL;
+
+void
+_MD_final_init (void)
+{
+    _connectLock = PR_NewLock();
+    PR_ASSERT(NULL != _connectLock); 
+#ifndef BONE_VERSION   
+    /* Workaround for nonblocking connects under net_server */
+    connectCount = 0;
+#endif
+}
+
+void
+_MD_AtomicInit (void)
+{
+    if (monitor == NULL) {
+        monitor = PR_NewLock();
+    }
+}
+
+/*
+** This is exceedingly messy.  atomic_add returns the last value, NSPR expects the new value.
+** We just add or subtract 1 from the result.  The actual memory update is atomic.
+*/
+
+PRInt32
+_MD_AtomicAdd( PRInt32 *ptr, PRInt32 val )
+{
+    return( ( atomic_add( (long *)ptr, val ) ) + val );
+}
+
+PRInt32
+_MD_AtomicIncrement( PRInt32 *val )
+{
+    return( ( atomic_add( (long *)val, 1 ) ) + 1 );
+}
+
+PRInt32
+_MD_AtomicDecrement( PRInt32 *val )
+{
+    return( ( atomic_add( (long *)val, -1 ) ) - 1 );
+}
+
+PRInt32
+_MD_AtomicSet( PRInt32 *val, PRInt32 newval )
+{
+    PRInt32 rv;
+
+    if (!_pr_initialized) {
+        _PR_ImplicitInitialization();
+    }
+    PR_Lock(monitor);
+    rv = *val;
+    *val = newval;
+    PR_Unlock(monitor);
+    return rv;
+}
diff --git a/nsprpub/pr/src/md/beos/bmmap.c b/nsprpub/pr/src/md/beos/bmmap.c
new file mode 100644
index 000000000..a9b3ac589
--- /dev/null
+++ b/nsprpub/pr/src/md/beos/bmmap.c
@@ -0,0 +1,41 @@
+/* -*- Mode: C++; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+PR_EXTERN(PRStatus)
+_PR_MD_CREATE_FILE_MAP(PRFileMap *fmap, PRInt64 size)
+{
+    PR_SetError( PR_NOT_IMPLEMENTED_ERROR, 0 );
+    return PR_FAILURE;
+}
+
+PR_EXTERN(PRInt32)
+_PR_MD_GET_MEM_MAP_ALIGNMENT(void)
+{
+    PR_SetError( PR_NOT_IMPLEMENTED_ERROR, 0 );
+    return -1;
+}
+
+PR_EXTERN(void *)
+_PR_MD_MEM_MAP(PRFileMap *fmap, PRInt64 offset, PRUint32 len)
+{
+    PR_SetError( PR_NOT_IMPLEMENTED_ERROR, 0 );
+    return 0;
+}
+
+PR_EXTERN(PRStatus)
+_PR_MD_MEM_UNMAP(void *addr, PRUint32 size)
+{
+    PR_SetError( PR_NOT_IMPLEMENTED_ERROR, 0 );
+    return PR_FAILURE;
+}
+
+PR_EXTERN(PRStatus)
+_PR_MD_CLOSE_FILE_MAP(PRFileMap *fmap)
+{
+    PR_SetError( PR_NOT_IMPLEMENTED_ERROR, 0 );
+    return PR_FAILURE;
+}
diff --git a/nsprpub/pr/src/md/beos/bnet.c b/nsprpub/pr/src/md/beos/bnet.c
new file mode 100644
index 000000000..8bfd4aead
--- /dev/null
+++ b/nsprpub/pr/src/md/beos/bnet.c
@@ -0,0 +1,911 @@
+/* -*- Mode: C++; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+#include <signal.h>
+#include <unistd.h>
+#include <memory.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/ioctl.h>
+
+/*
+ * Make sure _PRSockLen_t is 32-bit, because we will cast a PRUint32* or
+ * PRInt32* pointer to a _PRSockLen_t* pointer.
+ */
+#define _PRSockLen_t int
+
+
+/*
+** Global lock variable used to bracket calls into rusty libraries that
+** aren't thread safe (like libc, libX, etc).
+*/
+static PRLock *_pr_rename_lock = NULL;
+static PRMonitor *_pr_Xfe_mon = NULL;
+
+#define READ_FD     1
+#define WRITE_FD    2
+
+/*
+** This is a support routine to handle "deferred" i/o on sockets. 
+** It uses "select", so it is subject to all of the BeOS limitations
+** (only READ notification, only sockets)
+*/
+
+/*
+ * socket_io_wait --
+ *
+ * wait for socket i/o, periodically checking for interrupt
+ *
+ */
+
+static PRInt32 socket_io_wait(PRInt32 osfd, PRInt32 fd_type,
+                              PRIntervalTime timeout)
+{
+    PRInt32 rv = -1;
+    struct timeval tv;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    PRIntervalTime epoch, now, elapsed, remaining;
+    PRBool wait_for_remaining;
+    PRInt32 syserror;
+    fd_set rd_wr;
+
+    switch (timeout) {
+    case PR_INTERVAL_NO_WAIT:
+        PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+        break;
+    case PR_INTERVAL_NO_TIMEOUT:
+        /*
+         * This is a special case of the 'default' case below.
+         * Please see the comments there.
+         */
+        tv.tv_sec = _PR_INTERRUPT_CHECK_INTERVAL_SECS;
+        tv.tv_usec = 0;
+        FD_ZERO(&rd_wr);
+        do {
+            FD_SET(osfd, &rd_wr);
+            if (fd_type == READ_FD)
+                rv = _MD_SELECT(osfd + 1, &rd_wr, NULL, NULL, &tv);
+            else
+                rv = _MD_SELECT(osfd + 1, NULL, &rd_wr, NULL, &tv);
+            if (rv == -1 && (syserror = _MD_ERRNO()) != EINTR) {
+#ifdef BONE_VERSION
+                _PR_MD_MAP_SELECT_ERROR(syserror);
+#else
+                if (syserror == EBADF) {
+                    PR_SetError(PR_BAD_DESCRIPTOR_ERROR, EBADF);
+                } else {
+                    PR_SetError(PR_UNKNOWN_ERROR, syserror);
+                }
+#endif
+                break;
+            }
+            if (_PR_PENDING_INTERRUPT(me)) {
+                me->flags &= ~_PR_INTERRUPT;
+                PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+                rv = -1;
+                break;
+            }
+        } while (rv == 0 || (rv == -1 && syserror == EINTR));
+        break;
+    default:
+        now = epoch = PR_IntervalNow();
+        remaining = timeout;
+        FD_ZERO(&rd_wr);
+        do {
+            /*
+             * We block in _MD_SELECT for at most
+             * _PR_INTERRUPT_CHECK_INTERVAL_SECS seconds,
+             * so that there is an upper limit on the delay
+             * before the interrupt bit is checked.
+             */
+            wait_for_remaining = PR_TRUE;
+            tv.tv_sec = PR_IntervalToSeconds(remaining);
+            if (tv.tv_sec > _PR_INTERRUPT_CHECK_INTERVAL_SECS) {
+                wait_for_remaining = PR_FALSE;
+                tv.tv_sec = _PR_INTERRUPT_CHECK_INTERVAL_SECS;
+                tv.tv_usec = 0;
+            } else {
+                tv.tv_usec = PR_IntervalToMicroseconds(
+                                 remaining -
+                                 PR_SecondsToInterval(tv.tv_sec));
+            }
+            FD_SET(osfd, &rd_wr);
+            if (fd_type == READ_FD)
+                rv = _MD_SELECT(osfd + 1, &rd_wr, NULL, NULL, &tv);
+            else
+                rv = _MD_SELECT(osfd + 1, NULL, &rd_wr, NULL, &tv);
+            /*
+             * we don't consider EINTR a real error
+             */
+            if (rv == -1 && (syserror = _MD_ERRNO()) != EINTR) {
+#ifdef BONE_VERSION
+                _PR_MD_MAP_SELECT_ERROR(syserror);
+#else
+                if (syserror == EBADF) {
+                    PR_SetError(PR_BAD_DESCRIPTOR_ERROR, EBADF);
+                } else {
+                    PR_SetError(PR_UNKNOWN_ERROR, syserror);
+                }
+#endif
+                break;
+            }
+            if (_PR_PENDING_INTERRUPT(me)) {
+                me->flags &= ~_PR_INTERRUPT;
+                PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+                rv = -1;
+                break;
+            }
+            /*
+             * We loop again if _MD_SELECT timed out or got interrupted
+             * by a signal, and the timeout deadline has not passed yet.
+             */
+            if (rv == 0 || (rv == -1 && syserror == EINTR)) {
+                /*
+                 * If _MD_SELECT timed out, we know how much time
+                 * we spent in blocking, so we can avoid a
+                 * PR_IntervalNow() call.
+                 */
+                if (rv == 0) {
+                    if (wait_for_remaining) {
+                        now += remaining;
+                    } else {
+                        now += PR_SecondsToInterval(tv.tv_sec)
+                               + PR_MicrosecondsToInterval(tv.tv_usec);
+                    }
+                } else {
+                    now = PR_IntervalNow();
+                }
+                elapsed = (PRIntervalTime) (now - epoch);
+                if (elapsed >= timeout) {
+                    PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+                    rv = -1;
+                    break;
+                } else {
+                    remaining = timeout - elapsed;
+                }
+            }
+        } while (rv == 0 || (rv == -1 && syserror == EINTR));
+        break;
+    }
+    return(rv);
+}
+
+PRInt32
+_MD_recv (PRFileDesc *fd, void *buf, PRInt32 amount, PRInt32 flags,
+          PRIntervalTime timeout)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+#ifndef BONE_VERSION
+    if (fd->secret->md.sock_state & BE_SOCK_SHUTDOWN_READ) {
+        _PR_MD_MAP_RECV_ERROR(EPIPE);
+        return -1;
+    }
+#endif
+
+#ifdef BONE_VERSION
+    /*
+    ** Gah, stupid hack.  If reading a zero amount, instantly return success.
+    ** BONE beta 6 returns EINVAL for reads of zero bytes, which parts of
+    ** mozilla use to check for socket availability.
+    */
+
+    if( 0 == amount ) return(0);
+#endif
+
+    while ((rv = recv(osfd, buf, amount, flags)) == -1) {
+        err = _MD_ERRNO();
+
+        if ((err == EAGAIN) || (err == EWOULDBLOCK)) {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            /* If socket was supposed to be blocking,
+            wait a while for the condition to be
+            satisfied. */
+            if ((rv = socket_io_wait(osfd, READ_FD, timeout)) < 0)
+                goto done;
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))){
+            continue;
+
+        } else
+            break;
+    }
+
+    if (rv < 0) {
+        _PR_MD_MAP_RECV_ERROR(err);
+    }
+
+done:
+    return(rv);
+}
+
+PRInt32
+_MD_recvfrom (PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+              PRNetAddr *addr, PRUint32 *addrlen, PRIntervalTime timeout)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    while ((*addrlen = PR_NETADDR_SIZE(addr)),
+            ((rv = recvfrom(osfd, buf, amount, flags,
+                            (struct sockaddr *) addr,
+                            (_PRSockLen_t *)addrlen)) == -1)) {
+        err = _MD_ERRNO();
+
+        if ((err == EAGAIN) || (err == EWOULDBLOCK)) {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            if ((rv = socket_io_wait(osfd, READ_FD, timeout)) < 0)
+                goto done;
+
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))) {
+            continue;
+        } else {
+            break;
+        }
+    }
+
+    if (rv < 0) {
+        _PR_MD_MAP_RECVFROM_ERROR(err);
+    }
+
+done:
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    if (rv != -1) {
+        /* ignore the sa_len field of struct sockaddr */
+        if (addr) {
+            addr->raw.family = ((struct sockaddr *) addr)->sa_family;
+        }
+    }
+#endif /* _PR_HAVE_SOCKADDR_LEN */
+    return(rv);
+}
+
+PRInt32
+_MD_send (PRFileDesc *fd, const void *buf, PRInt32 amount, PRInt32 flags,
+          PRIntervalTime timeout)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+#ifndef BONE_VERSION
+    if (fd->secret->md.sock_state & BE_SOCK_SHUTDOWN_WRITE)
+    {
+        _PR_MD_MAP_SEND_ERROR(EPIPE);
+        return -1;
+    }
+#endif
+
+    while ((rv = send(osfd, buf, amount, flags)) == -1) {
+        err = _MD_ERRNO();
+
+        if ((err == EAGAIN) || (err == EWOULDBLOCK)) {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+
+#ifndef BONE_VERSION
+            if( _PR_PENDING_INTERRUPT(me)) {
+
+                me->flags &= ~_PR_INTERRUPT;
+                PR_SetError( PR_PENDING_INTERRUPT_ERROR, 0);
+                return -1;
+            }
+
+            /* in UNIX implementations, you could do a socket_io_wait here.
+             * but since BeOS doesn't yet support WRITE notification in select,
+             * you're spanked.
+             */
+            snooze( 10000L );
+            continue;
+#else /* BONE_VERSION */
+            if ((rv = socket_io_wait(osfd, WRITE_FD, timeout))< 0)
+                goto done;
+#endif
+
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))) {
+            continue;
+
+        } else {
+            break;
+        }
+    }
+
+#ifdef BONE_VERSION
+    /*
+     * optimization; if bytes sent is less than "amount" call
+     * select before returning. This is because it is likely that
+     * the next writev() call will return EWOULDBLOCK.
+     */
+    if ((!fd->secret->nonblocking) && (rv > 0) && (rv < amount)
+        && (timeout != PR_INTERVAL_NO_WAIT)) {
+        if (socket_io_wait(osfd, WRITE_FD, timeout) < 0) {
+            rv = -1;
+            goto done;
+        }
+    }
+#endif /* BONE_VERSION */
+    
+    if (rv < 0) {
+        _PR_MD_MAP_SEND_ERROR(err);
+    }
+
+#ifdef BONE_VERSION
+done:
+#endif
+    return(rv);
+}
+
+PRInt32
+_MD_sendto (PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+            const PRNetAddr *addr, PRUint32 addrlen, PRIntervalTime timeout)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    PRNetAddr addrCopy;
+
+    addrCopy = *addr;
+    ((struct sockaddr *) &addrCopy)->sa_len = addrlen;
+    ((struct sockaddr *) &addrCopy)->sa_family = addr->raw.family;
+
+    while ((rv = sendto(osfd, buf, amount, flags,
+                        (struct sockaddr *) &addrCopy, addrlen)) == -1) {
+#else
+    while ((rv = sendto(osfd, buf, amount, flags,
+                        (struct sockaddr *) addr, addrlen)) == -1) {
+#endif
+        err = _MD_ERRNO();
+
+        if ((err == EAGAIN) || (err == EWOULDBLOCK)) {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+
+#ifdef BONE_VERSION
+            if ((rv = socket_io_wait(osfd, WRITE_FD, timeout))< 0)
+                goto done;
+#endif
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))) {
+            continue;
+
+        } else {
+            break;
+        }
+    }
+
+    if (rv < 0) {
+        _PR_MD_MAP_SENDTO_ERROR(err);
+    }
+
+#ifdef BONE_VERSION
+done:
+#endif
+    return(rv);
+}
+
+#ifdef BONE_VERSION
+
+PRInt32 _MD_writev(
+    PRFileDesc *fd, const PRIOVec *iov,
+    PRInt32 iov_size, PRIntervalTime timeout)
+{
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    PRInt32 index, amount = 0;
+    PRInt32 osfd = fd->secret->md.osfd;
+    struct iovec osiov[PR_MAX_IOVECTOR_SIZE];
+
+    /* Ensured by PR_Writev */
+    PR_ASSERT(iov_size <= PR_MAX_IOVECTOR_SIZE);
+
+    /*
+     * We can't pass iov to writev because PRIOVec and struct iovec
+     * may not be binary compatible.  Make osiov a copy of iov and
+     * pass osiov to writev.
+     */
+    for (index = 0; index < iov_size; index++) {
+        osiov[index].iov_base = iov[index].iov_base;
+        osiov[index].iov_len = iov[index].iov_len;
+    }
+
+    /*
+     * Calculate the total number of bytes to be sent; needed for
+     * optimization later.
+     * We could avoid this if this number was passed in; but it is
+     * probably not a big deal because iov_size is usually small (less than
+     * 3)
+     */
+    if (!fd->secret->nonblocking) {
+        for (index=0; index<iov_size; index++) {
+            amount += iov[index].iov_len;
+        }
+    }
+
+    while ((rv = writev(osfd, osiov, iov_size)) == -1) {
+        err = _MD_ERRNO();
+        if ((err == EAGAIN) || (err == EWOULDBLOCK))    {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            if ((rv = socket_io_wait(osfd, WRITE_FD, timeout))<0)
+                goto done;
+
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))){
+            continue;
+        } else {
+            break;
+        }
+    }
+
+    /*
+     * optimization; if bytes sent is less than "amount" call
+     * select before returning. This is because it is likely that
+     * the next writev() call will return EWOULDBLOCK.
+     */
+    if ((!fd->secret->nonblocking) && (rv > 0) && (rv < amount)
+        && (timeout != PR_INTERVAL_NO_WAIT)) {
+        if (socket_io_wait(osfd, WRITE_FD, timeout) < 0) {
+            rv = -1;
+            goto done;
+        }
+    }
+
+
+    if (rv < 0) {
+        _PR_MD_MAP_WRITEV_ERROR(err);
+    }
+done:
+    return(rv);
+}
+
+#endif /* BONE_VERSION */
+
+PRInt32
+_MD_accept (PRFileDesc *fd, PRNetAddr *addr, PRUint32 *addrlen,
+            PRIntervalTime timeout)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    while ((rv = accept(osfd, (struct sockaddr *) addr,
+                        (_PRSockLen_t *)addrlen)) == -1) {
+        err = _MD_ERRNO();
+
+        if ((err == EAGAIN) || (err == EWOULDBLOCK)) {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            /* If it's SUPPOSED to be a blocking thread, wait
+             * a while to see if the triggering condition gets
+             * satisfied.
+             */
+            /* Assume that we're always using a native thread */
+            if ((rv = socket_io_wait(osfd, READ_FD, timeout)) < 0)
+                goto done;
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))) {
+            continue;
+        } else {
+            break;
+        }
+    }
+    if (rv < 0) {
+        _PR_MD_MAP_ACCEPT_ERROR(err);
+    } else if (addr != NULL) {
+        /* bug 134099 */
+        err = getpeername(rv, (struct sockaddr *) addr, (_PRSockLen_t *)addrlen);
+    }
+done:
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    if (rv != -1) {
+        /* Mask off the first byte of struct sockaddr (the length field) */
+        if (addr) {
+            addr->raw.family = ((struct sockaddr *) addr)->sa_family;
+        }
+    }
+#endif /* _PR_HAVE_SOCKADDR_LEN */
+    return(rv);
+}
+
+PRInt32
+_MD_connect (PRFileDesc *fd, const PRNetAddr *addr, PRUint32 addrlen,
+             PRIntervalTime timeout)
+{
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    PRInt32 osfd = fd->secret->md.osfd;
+
+#ifndef BONE_VERSION
+    fd->secret->md.connectValueValid = PR_FALSE;
+#endif
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    PRNetAddr addrCopy;
+
+    addrCopy = *addr;
+    ((struct sockaddr *) &addrCopy)->sa_len = addrlen;
+    ((struct sockaddr *) &addrCopy)->sa_family = addr->raw.family;
+#endif
+
+    /* (Copied from unix.c)
+     * We initiate the connection setup by making a nonblocking connect()
+     * call.  If the connect() call fails, there are two cases we handle
+     * specially:
+     * 1. The connect() call was interrupted by a signal.  In this case
+     *    we simply retry connect().
+     * 2. The NSPR socket is nonblocking and connect() fails with
+     *    EINPROGRESS.  We first wait until the socket becomes writable.
+     *    Then we try to find out whether the connection setup succeeded
+     *    or failed.
+     */
+
+retry:
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    if ((rv = connect(osfd, (struct sockaddr *)&addrCopy, addrlen)) == -1) {
+#else
+    if ((rv = connect(osfd, (struct sockaddr *)addr, addrlen)) == -1) {
+#endif
+        err = _MD_ERRNO();
+#ifndef BONE_VERSION
+        fd->secret->md.connectReturnValue = rv;
+        fd->secret->md.connectReturnError = err;
+        fd->secret->md.connectValueValid = PR_TRUE;
+#endif
+        if( err == EINTR ) {
+
+            if( _PR_PENDING_INTERRUPT(me)) {
+
+                me->flags &= ~_PR_INTERRUPT;
+                PR_SetError( PR_PENDING_INTERRUPT_ERROR, 0);
+                return -1;
+            }
+#ifndef BONE_VERSION
+            snooze( 100000L );
+#endif
+            goto retry;
+        }
+
+#ifndef BONE_VERSION
+        if(!fd->secret->nonblocking && ((err == EINPROGRESS) || (err==EAGAIN) || (err==EALREADY))) {
+
+            /*
+            ** There's no timeout on this connect, but that's not
+            ** a big deal, since the connect times out anyways
+            ** after 30 seconds.   Just sleep for 1/10th of a second
+            ** and retry until we go through or die.
+            */
+
+            if( _PR_PENDING_INTERRUPT(me)) {
+                me->flags &= ~_PR_INTERRUPT;
+                PR_SetError( PR_PENDING_INTERRUPT_ERROR, 0);
+                return -1;
+            }
+
+            goto retry;
+        }
+
+        if( fd->secret->nonblocking && ((err == EAGAIN) || (err == EINPROGRESS))) {
+            PR_Lock(_connectLock);
+            if (connectCount < sizeof(connectList)/sizeof(connectList[0])) {
+                connectList[connectCount].osfd = osfd;
+                memcpy(&connectList[connectCount].addr, addr, addrlen);
+                connectList[connectCount].addrlen = addrlen;
+                connectList[connectCount].timeout = timeout;
+                connectCount++;
+                PR_Unlock(_connectLock);
+                _PR_MD_MAP_CONNECT_ERROR(err);
+            } else {
+                PR_Unlock(_connectLock);
+                PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, 0);
+            }
+            return rv;
+        }
+#else /* BONE_VERSION */
+        if(!fd->secret->nonblocking && (err == EINTR)) {
+
+            rv = socket_io_wait(osfd, WRITE_FD, timeout);
+            if (rv == -1) {
+                return -1;
+            }
+
+            PR_ASSERT(rv == 1);
+            if (_PR_PENDING_INTERRUPT(me)) {
+                me->flags &= ~_PR_INTERRUPT;
+                PR_SetError( PR_PENDING_INTERRUPT_ERROR, 0);
+                return -1;
+            }
+            err = _MD_beos_get_nonblocking_connect_error(osfd);
+            if (err != 0) {
+                _PR_MD_MAP_CONNECT_ERROR(err);
+                return -1;
+            }
+            return 0;
+        }
+#endif
+
+        _PR_MD_MAP_CONNECT_ERROR(err);
+    }
+
+    return rv;
+}
+
+PRInt32
+_MD_bind (PRFileDesc *fd, const PRNetAddr *addr, PRUint32 addrlen)
+{
+    PRInt32 rv, err;
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    PRNetAddr addrCopy;
+
+    addrCopy = *addr;
+    ((struct sockaddr *) &addrCopy)->sa_len = addrlen;
+    ((struct sockaddr *) &addrCopy)->sa_family = addr->raw.family;
+    rv = bind(fd->secret->md.osfd, (struct sockaddr *) &addrCopy, (int )addrlen);
+#else
+    rv = bind(fd->secret->md.osfd, (struct sockaddr *) addr, (int )addrlen);
+#endif
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_BIND_ERROR(err);
+    }
+
+    return(rv);
+}
+
+PRInt32
+_MD_listen (PRFileDesc *fd, PRIntn backlog)
+{
+    PRInt32 rv, err;
+
+#ifndef BONE_VERSION
+    /* Bug workaround!  Setting listen to 0 on Be accepts no connections.
+    ** On most UN*Xes this sets the default.
+    */
+
+    if( backlog == 0 ) backlog = 5;
+#endif
+
+    rv = listen(fd->secret->md.osfd, backlog);
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_LISTEN_ERROR(err);
+    }
+
+    return(rv);
+}
+
+PRInt32
+_MD_shutdown (PRFileDesc *fd, PRIntn how)
+{
+    PRInt32 rv, err;
+
+#ifndef BONE_VERSION
+    if (how == PR_SHUTDOWN_SEND)
+        fd->secret->md.sock_state = BE_SOCK_SHUTDOWN_WRITE;
+    else if (how == PR_SHUTDOWN_RCV)
+        fd->secret->md.sock_state = BE_SOCK_SHUTDOWN_READ;
+    else if (how == PR_SHUTDOWN_BOTH) {
+        fd->secret->md.sock_state = (BE_SOCK_SHUTDOWN_WRITE | BE_SOCK_SHUTDOWN_READ);
+    }
+
+    return 0;
+#else /* BONE_VERSION */
+    rv = shutdown(fd->secret->md.osfd, how);
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_SHUTDOWN_ERROR(err);
+    }
+    return(rv);
+#endif
+}
+
+PRInt32
+_MD_socketpair (int af, int type, int flags, PRInt32 *osfd)
+{
+    return PR_NOT_IMPLEMENTED_ERROR;
+}
+
+PRInt32
+_MD_close_socket (PRInt32 osfd)
+{
+#ifdef BONE_VERSION
+    close( osfd );
+#else
+    closesocket( osfd );
+#endif
+}
+
+PRStatus
+_MD_getsockname (PRFileDesc *fd, PRNetAddr *addr, PRUint32 *addrlen)
+{
+    PRInt32 rv, err;
+
+    rv = getsockname(fd->secret->md.osfd,
+                     (struct sockaddr *) addr, (_PRSockLen_t *)addrlen);
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    if (rv == 0) {
+        /* ignore the sa_len field of struct sockaddr */
+        if (addr) {
+            addr->raw.family = ((struct sockaddr *) addr)->sa_family;
+        }
+    }
+#endif /* _PR_HAVE_SOCKADDR_LEN */
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_GETSOCKNAME_ERROR(err);
+    }
+
+    return rv==0?PR_SUCCESS:PR_FAILURE;
+}
+
+PRStatus
+_MD_getpeername (PRFileDesc *fd, PRNetAddr *addr, PRUint32 *addrlen)
+{
+    PRInt32 rv, err;
+
+    rv = getpeername(fd->secret->md.osfd,
+                     (struct sockaddr *) addr, (_PRSockLen_t *)addrlen);
+
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    if (rv == 0) {
+        /* ignore the sa_len field of struct sockaddr */
+        if (addr) {
+            addr->raw.family = ((struct sockaddr *) addr)->sa_family;
+        }
+    }
+#endif /* _PR_HAVE_SOCKADDR_LEN */
+
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_GETPEERNAME_ERROR(err);
+    }
+    return rv==0?PR_SUCCESS:PR_FAILURE;
+}
+
+PRStatus
+_MD_getsockopt (PRFileDesc *fd, PRInt32 level,
+                PRInt32 optname, char* optval, PRInt32* optlen)
+{
+    PRInt32 rv, err;
+
+    rv = getsockopt(fd->secret->md.osfd, level, optname,
+                    optval, (_PRSockLen_t *)optlen);
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_GETSOCKOPT_ERROR(err);
+    }
+
+    return rv==0?PR_SUCCESS:PR_FAILURE;
+}
+
+PRStatus
+_MD_setsockopt (PRFileDesc *fd, PRInt32 level,
+                PRInt32 optname, const char* optval, PRInt32 optlen)
+{
+    PRInt32 rv, err;
+
+    rv = setsockopt(fd->secret->md.osfd, level, optname, optval, optlen);
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_SETSOCKOPT_ERROR(err);
+    }
+    return rv==0?PR_SUCCESS:PR_FAILURE;
+}
+
+PRInt32
+_MD_accept_read (PRFileDesc *sd, PRInt32 *newSock, PRNetAddr **raddr,
+                 void *buf, PRInt32 amount, PRIntervalTime timeout)
+{
+    return PR_NOT_IMPLEMENTED_ERROR;
+}
+
+#ifndef BONE_VERSION
+PRInt32
+_MD_socket (int af, int type, int flags)
+{
+    PRInt32 osfd, err;
+
+    osfd = socket( af, type, 0 );
+
+    if( -1 == osfd ) {
+
+        err = _MD_ERRNO();
+        _PR_MD_MAP_SOCKET_ERROR( err );
+    }
+
+    return( osfd );
+}
+#else
+PRInt32
+_MD_socket(PRInt32 domain, PRInt32 type, PRInt32 proto)
+{
+    PRInt32 osfd, err;
+
+    osfd = socket(domain, type, proto);
+
+    if (osfd == -1) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_SOCKET_ERROR(err);
+    }
+
+    return(osfd);
+}
+#endif
+
+PRInt32
+_MD_socketavailable (PRFileDesc *fd)
+{
+#ifdef BONE_VERSION
+    PRInt32 result;
+
+    if (ioctl(fd->secret->md.osfd, FIONREAD, &result) < 0) {
+        _PR_MD_MAP_SOCKETAVAILABLE_ERROR(_MD_ERRNO());
+        return -1;
+    }
+    return result;
+#else
+    return PR_NOT_IMPLEMENTED_ERROR;
+#endif
+}
+
+PRInt32
+_MD_get_socket_error (void)
+{
+    return PR_NOT_IMPLEMENTED_ERROR;
+}
+
+PRStatus
+_MD_gethostname (char *name, PRUint32 namelen)
+{
+    PRInt32 rv, err;
+
+    rv = gethostname(name, namelen);
+    if (rv == 0)
+    {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_GETHOSTNAME_ERROR(err);
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}
+
+#ifndef BONE_VERSION
+PRInt32
+_MD_beos_get_nonblocking_connect_error(PRFileDesc *fd)
+{
+    int rv;
+    int flags = 0;
+
+    rv = recv(fd->secret->md.osfd, NULL, 0, flags);
+    PR_ASSERT(-1 == rv || 0 == rv);
+    if (-1 == rv && errno != EAGAIN && errno != EWOULDBLOCK) {
+        return errno;
+    }
+    return 0;  /* no error */
+}
+#else
+PRInt32
+_MD_beos_get_nonblocking_connect_error(int osfd)
+{
+    return PR_NOT_IMPLEMENTED_ERROR;
+    //    int err;
+    //    _PRSockLen_t optlen = sizeof(err);
+    //    if (getsockopt(osfd, SOL_SOCKET, SO_ERROR, (char *) &err, &optlen) == -1) {
+    //        return errno;
+    //    } else {
+    //        return err;
+    //    }
+}
+#endif /* BONE_VERSION */
diff --git a/nsprpub/pr/src/md/beos/bproc.c b/nsprpub/pr/src/md/beos/bproc.c
new file mode 100644
index 000000000..30ac56990
--- /dev/null
+++ b/nsprpub/pr/src/md/beos/bproc.c
@@ -0,0 +1,212 @@
+/* -*- Mode: C++; tab-width: 8; c-basic-offset: 8 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+#include <stdio.h>
+#include <signal.h>
+
+#define _PR_SIGNALED_EXITSTATUS 256
+
+PRProcess*
+_MD_create_process (const char *path, char *const *argv,
+		    char *const *envp, const PRProcessAttr *attr)
+{
+	PRProcess *process;
+	int nEnv, idx;
+	char *const *childEnvp;
+	char **newEnvp = NULL;
+	int flags;
+	PRBool found = PR_FALSE;
+
+	process = PR_NEW(PRProcess);
+	if (!process) {
+		PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+		return NULL;
+	}
+
+	childEnvp = envp;
+	if (attr && attr->fdInheritBuffer) {
+		if (NULL == childEnvp) {
+			childEnvp = environ;
+		}
+		for (nEnv = 0; childEnvp[nEnv]; nEnv++) {
+		}
+		newEnvp = (char **) PR_MALLOC((nEnv + 2) * sizeof(char *));
+		if (NULL == newEnvp) {
+			PR_DELETE(process);
+			PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+			return NULL;
+		}
+		for (idx = 0; idx < nEnv; idx++) {
+			newEnvp[idx] = childEnvp[idx];
+			if (!found && !strncmp(newEnvp[idx], "NSPR_INHERIT_FDS=", 17)) {
+				newEnvp[idx] = attr->fdInheritBuffer;
+				found = PR_TRUE;
+			}
+		}
+		if (!found) {
+			newEnvp[idx++] = attr->fdInheritBuffer;
+		}
+		newEnvp[idx] = NULL;
+		childEnvp = newEnvp;
+	}
+
+	process->md.pid = fork();
+
+	if ((pid_t) -1 == process->md.pid) {
+		PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, errno);
+		PR_DELETE(process);
+		if (newEnvp) {
+			PR_DELETE(newEnvp);
+		}
+		return NULL;
+	} else if (0 == process->md.pid) {  /* the child process */
+		/*
+		 * If the child process needs to exit, it must call _exit().
+		 * Do not call exit(), because exit() will flush and close
+		 * the standard I/O file descriptors, and hence corrupt
+		 * the parent process's standard I/O data structures.
+		 */
+
+		if (attr) {
+			/* the osfd's to redirect stdin, stdout, and stderr to */
+			int in_osfd = -1, out_osfd = -1, err_osfd = -1;
+
+			if (attr->stdinFd
+			    && attr->stdinFd->secret->md.osfd != 0) {
+				in_osfd = attr->stdinFd->secret->md.osfd;
+				if (dup2(in_osfd, 0) != 0) {
+					_exit(1);  /* failed */
+				}
+				flags = fcntl(0, F_GETFL, 0);
+				if (flags & O_NONBLOCK) {
+					fcntl(0, F_SETFL, flags & ~O_NONBLOCK);
+				}
+			}
+			if (attr->stdoutFd
+			    && attr->stdoutFd->secret->md.osfd != 1) {
+				out_osfd = attr->stdoutFd->secret->md.osfd;
+				if (dup2(out_osfd, 1) != 1) {
+					_exit(1);  /* failed */
+				}
+				flags = fcntl(1, F_GETFL, 0);
+				if (flags & O_NONBLOCK) {
+					fcntl(1, F_SETFL, flags & ~O_NONBLOCK);
+				}
+			}
+			if (attr->stderrFd
+			    && attr->stderrFd->secret->md.osfd != 2) {
+				err_osfd = attr->stderrFd->secret->md.osfd;
+				if (dup2(err_osfd, 2) != 2) {
+					_exit(1);  /* failed */
+				}
+				flags = fcntl(2, F_GETFL, 0);
+				if (flags & O_NONBLOCK) {
+					fcntl(2, F_SETFL, flags & ~O_NONBLOCK);
+				}
+			}
+			if (in_osfd != -1) {
+				close(in_osfd);
+			}
+			if (out_osfd != -1 && out_osfd != in_osfd) {
+				close(out_osfd);
+			}
+			if (err_osfd != -1 && err_osfd != in_osfd
+			    && err_osfd != out_osfd) {
+				close(err_osfd);
+			}
+			if (attr->currentDirectory) {
+				if (chdir(attr->currentDirectory) < 0) {
+					_exit(1);  /* failed */
+				}
+			}
+		}
+
+		if (childEnvp) {
+			(void)execve(path, argv, childEnvp);
+		} else {
+			/* Inherit the environment of the parent. */
+			(void)execv(path, argv);
+		}
+		/* Whoops! It returned. That's a bad sign. */
+		_exit(1);
+	}
+
+	if (newEnvp) {
+		PR_DELETE(newEnvp);
+	}
+
+	return process;
+}
+
+PRStatus
+_MD_detach_process (PRProcess *process)
+{
+	/* If we kept a process table like unix does,
+	 * we'd remove the entry here.
+	 * Since we dont', just delete the process variable
+	 */
+	PR_DELETE(process);
+	return PR_SUCCESS;
+}
+
+PRStatus
+_MD_wait_process (PRProcess *process, PRInt32 *exitCode)
+{
+	PRStatus retVal = PR_SUCCESS;
+	int ret, status;
+	
+	/* Ignore interruptions */
+	do {
+		ret = waitpid(process->md.pid, &status, 0);
+	} while (ret == -1 && errno == EINTR);
+
+	/*
+	 * waitpid() cannot return 0 because we did not invoke it
+	 * with the WNOHANG option.
+	 */ 
+	PR_ASSERT(0 != ret);
+
+	if (ret < 0) {
+                PR_SetError(PR_UNKNOWN_ERROR, _MD_ERRNO());
+		return PR_FAILURE;
+	}
+
+	/* If child process exited normally, return child exit code */
+	if (WIFEXITED(status)) {
+		*exitCode = WEXITSTATUS(status);
+	} else {
+		PR_ASSERT(WIFSIGNALED(status));
+		*exitCode = _PR_SIGNALED_EXITSTATUS;
+	}		
+
+	PR_DELETE(process);
+	return PR_SUCCESS;
+}
+
+PRStatus
+_MD_kill_process (PRProcess *process)
+{
+	PRErrorCode prerror;
+	PRInt32 oserror;
+	
+	if (kill(process->md.pid, SIGKILL) == 0) {
+		return PR_SUCCESS;
+	}
+	oserror = errno;
+	switch (oserror) {
+        case EPERM:
+		prerror = PR_NO_ACCESS_RIGHTS_ERROR;
+		break;
+        case ESRCH:
+		prerror = PR_INVALID_ARGUMENT_ERROR;
+		break;
+        default:
+		prerror = PR_UNKNOWN_ERROR;
+		break;
+	}
+	PR_SetError(prerror, oserror);
+	return PR_FAILURE;
+}
diff --git a/nsprpub/pr/src/md/beos/brng.c b/nsprpub/pr/src/md/beos/brng.c
new file mode 100644
index 000000000..18a3bbf1e
--- /dev/null
+++ b/nsprpub/pr/src/md/beos/brng.c
@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+#include <stdio.h>
+#include <string.h>
+#include <signal.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <assert.h>
+#include <time.h>
+#include "primpl.h"
+
+extern PRSize _PR_MD_GetRandomNoise( void *buf, PRSize size )
+{
+    struct timeval tv;
+    int n = 0;
+    int s;
+
+    GETTIMEOFDAY(&tv);
+
+    if ( size > 0 ) {
+        s = _pr_CopyLowBits((char*)buf+n, size, &tv.tv_usec, sizeof(tv.tv_usec));
+        size -= s;
+        n += s;
+    }
+    if ( size > 0 ) {
+        s = _pr_CopyLowBits((char*)buf+n, size, &tv.tv_sec, sizeof(tv.tv_usec));
+        size -= s;
+        n += s;
+    }
+
+    return n;
+} /* end _PR_MD_GetRandomNoise() */
diff --git a/nsprpub/pr/src/md/beos/bseg.c b/nsprpub/pr/src/md/beos/bseg.c
new file mode 100644
index 000000000..e7bb9b3d7
--- /dev/null
+++ b/nsprpub/pr/src/md/beos/bseg.c
@@ -0,0 +1,22 @@
+/* -*- Mode: C++; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+PR_IMPLEMENT(void)
+    _MD_init_segs (void)
+{
+}
+
+PR_IMPLEMENT(PRStatus)
+    _MD_alloc_segment (PRSegment *seg, PRUint32 size, void *vaddr)
+{
+    return PR_NOT_IMPLEMENTED_ERROR;
+}
+
+PR_IMPLEMENT(void)
+    _MD_free_segment (PRSegment *seg)
+{
+}
diff --git a/nsprpub/pr/src/md/beos/bsrcs.mk b/nsprpub/pr/src/md/beos/bsrcs.mk
new file mode 100644
index 000000000..94424537f
--- /dev/null
+++ b/nsprpub/pr/src/md/beos/bsrcs.mk
@@ -0,0 +1,22 @@
+# 
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+# this file lists the source files to be compiled (used in Makefile) and
+# then enumerated as object files (in objs.mk) for inclusion in the NSPR
+# shared library
+
+MDCSRCS =             \
+	beos.c        \
+	beos_errors.c \
+	bfile.c       \
+	bmisc.c       \
+	bnet.c        \
+	bproc.c       \
+	brng.c        \
+	bseg.c        \
+	btime.c       \
+	bmmap.c       \
+	$(NULL)
diff --git a/nsprpub/pr/src/md/beos/btime.c b/nsprpub/pr/src/md/beos/btime.c
new file mode 100644
index 000000000..b6e02fc7d
--- /dev/null
+++ b/nsprpub/pr/src/md/beos/btime.c
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+#include <kernel/OS.h>
+
+static bigtime_t start;
+
+PRTime
+_MD_now (void)
+{
+    return (PRTime)real_time_clock_usecs();
+}
+
+void
+_MD_interval_init (void)
+{
+    /* grab the base interval time */
+    start = real_time_clock_usecs();
+}
+
+PRIntervalTime
+_MD_get_interval (void)
+{
+    return( (PRIntervalTime) real_time_clock_usecs() / 10 );
+
+#if 0
+    /* return the number of tens of microseconds that have elapsed since
+       we were initialized */
+    bigtime_t now = real_time_clock_usecs();
+    now -= start;
+    now /= 10;
+    return (PRIntervalTime)now;
+#endif
+}
+
+PRIntervalTime
+_MD_interval_per_sec (void)
+{
+    return 100000L;
+}
diff --git a/nsprpub/pr/src/md/beos/objs.mk b/nsprpub/pr/src/md/beos/objs.mk
new file mode 100644
index 000000000..8727ee0e6
--- /dev/null
+++ b/nsprpub/pr/src/md/beos/objs.mk
@@ -0,0 +1,11 @@
+# 
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# This makefile appends to the variable OBJS the platform-dependent
+# object modules that will be part of the nspr20 library.
+
+include $(srcdir)/md/beos/bsrcs.mk
+
+OBJS += $(MDCSRCS:%.c=md/beos/$(OBJDIR)/%.$(OBJ_SUFFIX))
diff --git a/nsprpub/pr/src/md/os2/Makefile.in b/nsprpub/pr/src/md/os2/Makefile.in
new file mode 100644
index 000000000..9a7648ef8
--- /dev/null
+++ b/nsprpub/pr/src/md/os2/Makefile.in
@@ -0,0 +1,47 @@
+# 
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#! gmake
+
+MOD_DEPTH	= ../../../..
+topsrcdir	= @top_srcdir@
+srcdir		= @srcdir@
+VPATH		= @srcdir@
+
+include $(MOD_DEPTH)/config/autoconf.mk
+
+include $(topsrcdir)/config/config.mk
+
+ifeq ($(OS_TARGET), OS2)
+CSRCS = \
+    os2misc.c \
+    os2sem.c   \
+    os2inrval.c \
+    os2gc.c \
+    os2thred.c \
+    os2io.c \
+    os2cv.c \
+    os2sock.c \
+    os2_errors.c \
+    os2poll.c \
+    os2rng.c \
+    $(NULL)
+endif
+
+ASFILES = os2emx.s os2vaclegacy.s
+
+TARGETS	= $(OBJS)
+
+INCLUDES = -I$(dist_includedir) -I$(topsrcdir)/pr/include -I$(topsrcdir)/pr/include/private
+
+DEFINES	+= -D_NSPR_BUILD_
+
+include $(topsrcdir)/config/rules.mk
+
+export:: $(TARGETS)
+
+
+
+
diff --git a/nsprpub/pr/src/md/os2/objs.mk b/nsprpub/pr/src/md/os2/objs.mk
new file mode 100644
index 000000000..c1a40e3f7
--- /dev/null
+++ b/nsprpub/pr/src/md/os2/objs.mk
@@ -0,0 +1,27 @@
+# 
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# This makefile appends to the variable OBJS the platform-dependent
+# object modules that will be part of the nspr20 library.
+
+CSRCS = \
+	os2io.c      \
+	os2sock.c    \
+	os2thred.c   \
+	os2cv.c      \
+	os2gc.c      \
+	os2misc.c    \
+	os2inrval.c  \
+	os2sem.c     \
+	os2_errors.c \
+	os2poll.c    \
+	os2rng.c     \
+	$(NULL)
+
+ASFILES = os2emx.s os2vaclegacy.s
+
+OBJS += $(addprefix md/os2/$(OBJDIR)/,$(CSRCS:.c=.$(OBJ_SUFFIX)))  \
+	$(addprefix md/os2/$(OBJDIR)/,$(ASFILES:.$(ASM_SUFFIX)=.$(OBJ_SUFFIX)))
+
diff --git a/nsprpub/pr/src/md/os2/os2_errors.c b/nsprpub/pr/src/md/os2/os2_errors.c
new file mode 100644
index 000000000..98f5cde59
--- /dev/null
+++ b/nsprpub/pr/src/md/os2/os2_errors.c
@@ -0,0 +1,1095 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "prerror.h"
+#include "primpl.h"
+
+void _MD_os2_map_default_error(PRInt32 err)
+{
+	switch (err) {
+		case EWOULDBLOCK:
+			PR_SetError(PR_WOULD_BLOCK_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+		case EMSGSIZE:
+		case EINVAL:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		case ENOBUFS:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		case ECONNREFUSED:
+			PR_SetError(PR_CONNECT_REFUSED_ERROR, err);
+			break;
+		case EISCONN:
+			PR_SetError(PR_IS_CONNECTED_ERROR, err);
+			break;
+#ifdef SOCEFAULT
+		case SOCEFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+#endif
+		case ERROR_NETNAME_DELETED:
+			PR_SetError(PR_CONNECT_RESET_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+void _MD_os2_map_opendir_error(PRInt32 err)
+{
+	switch (err) {
+		case ERROR_FILE_NOT_FOUND:
+		case ERROR_PATH_NOT_FOUND:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case ERROR_ACCESS_DENIED:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+      case ERROR_INVALID_ADDRESS:
+      case ERROR_INVALID_ACCESS:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+      case ERROR_INVALID_NAME:
+      case ERROR_INVALID_PARAMETER:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+      case ERROR_TOO_MANY_OPEN_FILES:
+		case ERROR_NOT_DOS_DISK:
+		case ERROR_NOT_READY:
+		case ERROR_OPEN_FAILED:
+      case ERROR_PATH_BUSY:
+      case ERROR_CANNOT_MAKE:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+      case ERROR_DRIVE_LOCKED:
+      case ERROR_DEVICE_IN_USE:
+			PR_SetError(PR_FILE_IS_LOCKED_ERROR, err);
+			break;
+		case ERROR_FILENAME_EXCED_RANGE:
+			PR_SetError(PR_NAME_TOO_LONG_ERROR, err);
+			break;
+		case ERROR_NOT_ENOUGH_MEMORY:
+		case ERROR_SHARING_BUFFER_EXCEEDED:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_closedir_error(PRInt32 err)
+{
+	switch (err) {
+      case ERROR_FILE_NOT_FOUND:
+      case ERROR_ACCESS_DENIED:
+		case ERROR_INVALID_HANDLE:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_readdir_error(PRInt32 err)
+{
+
+	switch (err) {
+		case ERROR_NO_MORE_FILES:
+			PR_SetError(PR_NO_MORE_FILES_ERROR, err);
+			break;
+		case ERROR_FILE_NOT_FOUND:
+		case ERROR_INVALID_HANDLE:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ERROR_INVALID_ADDRESS:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ERROR_NOT_DOS_DISK:
+		case ERROR_LOCK_VIOLATION:
+		case ERROR_BROKEN_PIPE:
+		case ERROR_NOT_READY:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case ERROR_NOT_ENOUGH_MEMORY:
+      case ERROR_MORE_DATA:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_delete_error(PRInt32 err)
+{
+	switch (err) {
+		case ERROR_FILE_NOT_FOUND:
+		case ERROR_PATH_NOT_FOUND:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case ERROR_ACCESS_DENIED:
+		case ERROR_WRITE_PROTECT:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case ERROR_INVALID_ADDRESS:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ERROR_DRIVE_LOCKED:
+		case ERROR_LOCKED:
+		case ERROR_SHARING_VIOLATION:
+			PR_SetError(PR_FILE_IS_LOCKED_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+/* The error code for stat() is in errno. */
+void _MD_os2_map_stat_error(PRInt32 err)
+{
+    switch (err) {
+        case ENOENT:
+            PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+            break;
+        case EACCES:
+            PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+            break;
+        default:
+            PR_SetError(PR_UNKNOWN_ERROR, err);
+    }
+}
+
+void _MD_os2_map_fstat_error(PRInt32 err)
+{
+	switch (err) {
+		case ERROR_ACCESS_DENIED:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case ERROR_INVALID_HANDLE:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ERROR_INVALID_ADDRESS:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ERROR_NOT_READY:
+		case ERROR_PATH_BUSY:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case ERROR_NOT_ENOUGH_MEMORY:
+		case ERROR_MORE_DATA:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		case ERROR_DRIVE_LOCKED:
+		case ERROR_LOCKED:
+			PR_SetError(PR_FILE_IS_LOCKED_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_rename_error(PRInt32 err)
+{
+	switch (err) {
+		case ERROR_FILE_NOT_FOUND:
+		case ERROR_PATH_NOT_FOUND:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case ERROR_ACCESS_DENIED:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case ERROR_INVALID_ADDRESS:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ERROR_INVALID_NAME:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		case ERROR_NOT_READY:
+		case ERROR_PATH_BUSY:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case ERROR_DRIVE_LOCKED:
+			PR_SetError(PR_FILE_IS_LOCKED_ERROR, err);
+			break;
+		case ERROR_FILENAME_EXCED_RANGE:
+			PR_SetError(PR_NAME_TOO_LONG_ERROR, err);
+			break;
+		case ERROR_NOT_ENOUGH_MEMORY:
+		case ERROR_MORE_DATA:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		case ERROR_ALREADY_EXISTS:
+		case ERROR_FILE_EXISTS:
+			PR_SetError(PR_FILE_EXISTS_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+/* The error code for access() is in errno. */
+void _MD_os2_map_access_error(PRInt32 err)
+{
+    switch (err) {
+        case ENOENT:
+            PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+            break;
+        case EACCES:
+            PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+            break;
+        default:
+            PR_SetError(PR_UNKNOWN_ERROR, err);
+    }
+}
+
+void _MD_os2_map_mkdir_error(PRInt32 err)
+{
+	switch (err) {
+		case ERROR_ALREADY_EXISTS:
+		case ERROR_FILE_EXISTS:
+			PR_SetError(PR_FILE_EXISTS_ERROR, err);
+			break;
+		case ERROR_FILE_NOT_FOUND:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case ERROR_ACCESS_DENIED:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case ERROR_INVALID_ADDRESS:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ERROR_INVALID_NAME:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		case ERROR_NOT_READY:
+		case ERROR_PATH_BUSY:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case ERROR_DRIVE_LOCKED:
+			PR_SetError(PR_FILE_IS_LOCKED_ERROR, err);
+			break;
+		case ERROR_FILENAME_EXCED_RANGE:
+			PR_SetError(PR_NAME_TOO_LONG_ERROR, err);
+			break;
+		case ERROR_TOO_MANY_OPEN_FILES:
+			PR_SetError(PR_SYS_DESC_TABLE_FULL_ERROR, err);
+			break;
+		case ERROR_PATH_NOT_FOUND:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case ERROR_NOT_ENOUGH_MEMORY:
+		case ERROR_MORE_DATA:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		case ERROR_DISK_FULL:
+		case ERROR_HANDLE_DISK_FULL:
+			PR_SetError(PR_NO_DEVICE_SPACE_ERROR, err);
+			break;
+		case ERROR_WRITE_PROTECT:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_rmdir_error(PRInt32 err)
+{
+
+	switch (err) {
+		case ERROR_FILE_NOT_FOUND:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case ERROR_ACCESS_DENIED:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case ERROR_INVALID_ADDRESS:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ERROR_INVALID_NAME:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		case ERROR_NOT_READY:
+		case ERROR_PATH_BUSY:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case ERROR_DRIVE_LOCKED:
+			PR_SetError(PR_FILE_IS_LOCKED_ERROR, err);
+			break;
+		case ERROR_FILENAME_EXCED_RANGE:
+			PR_SetError(PR_NAME_TOO_LONG_ERROR, err);
+			break;
+		case ERROR_TOO_MANY_OPEN_FILES:
+			PR_SetError(PR_SYS_DESC_TABLE_FULL_ERROR, err);
+			break;
+		case ERROR_PATH_NOT_FOUND:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case ERROR_NOT_ENOUGH_MEMORY:
+		case ERROR_MORE_DATA:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		case ERROR_WRITE_PROTECT:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_read_error(PRInt32 err)
+{
+	switch (err) {
+		case ERROR_ACCESS_DENIED:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case ERROR_INVALID_HANDLE:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ERROR_INVALID_ADDRESS:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ERROR_NOT_READY:
+		case ERROR_PATH_BUSY:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case ERROR_NOT_ENOUGH_MEMORY:
+		case ERROR_MORE_DATA:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		case ERROR_DRIVE_LOCKED:
+		case ERROR_LOCKED:
+		case ERROR_SHARING_VIOLATION:
+			PR_SetError(PR_FILE_IS_LOCKED_ERROR, err);
+			break;
+		case ERROR_NETNAME_DELETED:
+			PR_SetError(PR_CONNECT_RESET_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break; 
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#ifdef SOCEFAULT
+		case SOCEFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+#endif
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_transmitfile_error(PRInt32 err)
+{
+	switch (err) {
+		case ERROR_ACCESS_DENIED:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case ERROR_INVALID_HANDLE:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ERROR_INVALID_ADDRESS:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ERROR_NOT_READY:
+		case ERROR_PATH_BUSY:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case ERROR_NOT_ENOUGH_MEMORY:
+		case ERROR_MORE_DATA:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		case ERROR_DRIVE_LOCKED:
+		case ERROR_LOCKED:
+		case ERROR_SHARING_VIOLATION:
+			PR_SetError(PR_FILE_IS_LOCKED_ERROR, err);
+			break;
+		case ERROR_FILENAME_EXCED_RANGE:
+			PR_SetError(PR_NAME_TOO_LONG_ERROR, err);
+			break;
+		case ERROR_TOO_MANY_OPEN_FILES:
+			PR_SetError(PR_SYS_DESC_TABLE_FULL_ERROR, err);
+			break;
+		case ERROR_PATH_NOT_FOUND:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#ifdef SOCEFAULT
+		case SOCEFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+#endif
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_write_error(PRInt32 err)
+{
+	switch (err) {
+		case ERROR_ACCESS_DENIED:
+		case ERROR_WRITE_PROTECT:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case ERROR_INVALID_HANDLE:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ERROR_INVALID_ADDRESS:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ERROR_NOT_READY:
+		case ERROR_PATH_BUSY:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case ERROR_DRIVE_LOCKED:
+		case ERROR_LOCKED:
+		case ERROR_SHARING_VIOLATION:
+			PR_SetError(PR_FILE_IS_LOCKED_ERROR, err);
+			break;
+		case ERROR_NOT_ENOUGH_MEMORY:
+		case ERROR_MORE_DATA:
+		case ERROR_DISK_FULL:
+      case ERROR_HANDLE_DISK_FULL:
+      case ENOSPC:
+			PR_SetError(PR_NO_DEVICE_SPACE_ERROR, err);
+			break;
+		case ERROR_NETNAME_DELETED:
+			PR_SetError(PR_CONNECT_RESET_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+		case EMSGSIZE:
+		case EINVAL:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		case ENOBUFS:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		case ECONNREFUSED:
+			PR_SetError(PR_CONNECT_REFUSED_ERROR, err);
+			break;
+		case EISCONN:
+			PR_SetError(PR_IS_CONNECTED_ERROR, err);
+			break;
+#ifdef SOCEFAULT
+		case SOCEFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+#endif
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_lseek_error(PRInt32 err)
+{
+	switch (err) {
+		case ERROR_INVALID_HANDLE:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ERROR_SEEK_ON_DEVICE:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_fsync_error(PRInt32 err)
+{
+	switch (err) {
+		case ERROR_ACCESS_DENIED:
+		case ERROR_WRITE_PROTECT:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case ERROR_INVALID_HANDLE:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ERROR_NOT_ENOUGH_MEMORY:
+		case ERROR_MORE_DATA:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		case ERROR_DISK_FULL:
+		case ERROR_HANDLE_DISK_FULL:
+			PR_SetError(PR_NO_DEVICE_SPACE_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_close_error(PRInt32 err)
+{
+	switch (err) {
+		case ERROR_INVALID_HANDLE:
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ERROR_NOT_READY:
+		case ERROR_PATH_BUSY:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_socket_error(PRInt32 err)
+{
+	switch (err) {
+		case EPROTONOSUPPORT:
+			PR_SetError(PR_PROTOCOL_NOT_SUPPORTED_ERROR, err);
+			break;
+		case EACCES:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case ERROR_NOT_ENOUGH_MEMORY:
+		case ERROR_MORE_DATA:
+		case ENOBUFS:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_recv_error(PRInt32 err)
+{
+	switch (err) {
+		case EWOULDBLOCK:
+			PR_SetError(PR_WOULD_BLOCK_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#ifdef SOCEFAULT
+		case SOCEFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+#endif
+		case ERROR_NETNAME_DELETED:
+			PR_SetError(PR_CONNECT_RESET_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_recvfrom_error(PRInt32 err)
+{
+	switch (err) {
+		case EWOULDBLOCK:
+			PR_SetError(PR_WOULD_BLOCK_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#ifdef SOCEFAULT
+		case SOCEFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+#endif
+		case ERROR_NETNAME_DELETED:
+			PR_SetError(PR_CONNECT_RESET_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_send_error(PRInt32 err)
+{
+	switch (err) {
+		case EWOULDBLOCK:
+			PR_SetError(PR_WOULD_BLOCK_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+		case EMSGSIZE:
+		case EINVAL:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		case ENOBUFS:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		case ECONNREFUSED:
+			PR_SetError(PR_CONNECT_REFUSED_ERROR, err);
+			break;
+		case EISCONN:
+			PR_SetError(PR_IS_CONNECTED_ERROR, err);
+			break;
+#ifdef SOCEFAULT
+		case SOCEFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+#endif
+		case ERROR_NETNAME_DELETED:
+			PR_SetError(PR_CONNECT_RESET_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_sendto_error(PRInt32 err)
+{
+  _MD_os2_map_default_error(err);
+}
+
+void _MD_os2_map_writev_error(int err)
+{
+  _MD_os2_map_default_error(err);
+}
+
+void _MD_os2_map_accept_error(PRInt32 err)
+{
+  _MD_os2_map_default_error(err);
+}
+
+void _MD_os2_map_acceptex_error(PRInt32 err)
+{
+	switch (err) {
+		case ERROR_INVALID_HANDLE:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ERROR_INVALID_ADDRESS:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ERROR_NOT_ENOUGH_MEMORY:
+		case ERROR_MORE_DATA:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+/*
+ * An error code of 0 means that the nonblocking connect succeeded.
+ */
+
+int _MD_os2_get_nonblocking_connect_error(int osfd)
+{
+    int err;
+    int len = sizeof(err);
+    if (getsockopt(osfd, SOL_SOCKET, SO_ERROR, (char *) &err, &len) == -1) {
+        return sock_errno();
+    } else {
+        return err;
+    }
+}
+
+void _MD_os2_map_connect_error(PRInt32 err)
+{
+	switch (err) {
+       case EWOULDBLOCK:
+			PR_SetError(PR_WOULD_BLOCK_ERROR, err);
+			break;
+        case EINPROGRESS:
+			PR_SetError(PR_IN_PROGRESS_ERROR, err);
+			break;
+		case EALREADY:
+		case EINVAL:
+			PR_SetError(PR_ALREADY_INITIATED_ERROR, err);
+			break;
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case EADDRNOTAVAIL:
+			PR_SetError(PR_ADDRESS_NOT_AVAILABLE_ERROR, err);
+			break;
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+		case EAFNOSUPPORT:
+			PR_SetError(PR_ADDRESS_NOT_SUPPORTED_ERROR, err);
+			break;
+		case ETIMEDOUT:
+			PR_SetError(PR_IO_TIMEOUT_ERROR, err);
+			break;
+		case ECONNREFUSED:
+			PR_SetError(PR_CONNECT_REFUSED_ERROR, err);
+			break;
+		case ENETUNREACH:
+			PR_SetError(PR_NETWORK_UNREACHABLE_ERROR, err);
+			break;
+		case EADDRINUSE:
+			PR_SetError(PR_ADDRESS_IN_USE_ERROR, err);
+			break;
+      case EISCONN:
+         PR_SetError(PR_IS_CONNECTED_ERROR, err);
+         break;
+#ifdef SOCEFAULT
+		case SOCEFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+#endif
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_bind_error(PRInt32 err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#ifdef SOCEFAULT
+		case SOCEFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+#endif
+		case EADDRNOTAVAIL:
+			PR_SetError(PR_ADDRESS_NOT_AVAILABLE_ERROR, err);
+			break;
+		case EADDRINUSE:
+			PR_SetError(PR_ADDRESS_IN_USE_ERROR, err);
+			break;
+		case EACCES:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case EINVAL:
+			PR_SetError(PR_SOCKET_ADDRESS_IS_BOUND_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_listen_error(PRInt32 err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+		case EOPNOTSUPP:
+			PR_SetError(PR_NOT_TCP_SOCKET_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_shutdown_error(PRInt32 err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+		case ENOTCONN:
+			PR_SetError(PR_NOT_CONNECTED_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_socketpair_error(PRInt32 err)
+{
+  switch (err) {
+    case ENOMEM:
+      PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+      break;
+    case EAFNOSUPPORT:
+      PR_SetError(PR_ADDRESS_NOT_SUPPORTED_ERROR, err);
+      break;
+    case EPROTONOSUPPORT:
+      PR_SetError(PR_PROTOCOL_NOT_SUPPORTED_ERROR, err);
+      break;
+    case EOPNOTSUPP:
+      PR_SetError(PR_NOT_TCP_SOCKET_ERROR, err);
+      break;
+    case EPROTOTYPE:
+      PR_SetError(PR_ADDRESS_NOT_SUPPORTED_ERROR, err);
+      break;
+    default:
+      _MD_os2_map_default_error(err);
+      return;
+  }
+}
+
+void _MD_os2_map_getsockname_error(PRInt32 err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+#ifdef SOCEFAULT
+		case SOCEFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+#endif
+		case ENOBUFS:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_getpeername_error(PRInt32 err)
+{
+
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+		case ENOTCONN:
+			PR_SetError(PR_NOT_CONNECTED_ERROR, err);
+			break;
+#ifdef SOCEFAULT
+		case SOCEFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+#endif
+		case ENOBUFS:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_getsockopt_error(PRInt32 err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+		case ENOPROTOOPT:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+#ifdef SOCEFAULT
+		case SOCEFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+#endif
+		case EINVAL:
+			PR_SetError(PR_BUFFER_OVERFLOW_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_setsockopt_error(PRInt32 err)
+{
+	switch (err) {
+		case EBADF:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ENOTSOCK:
+			PR_SetError(PR_NOT_SOCKET_ERROR, err);
+			break;
+		case ENOPROTOOPT:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+#ifdef SOCEFAULT
+		case SOCEFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+#endif
+		case EINVAL:
+			PR_SetError(PR_BUFFER_OVERFLOW_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_open_error(PRInt32 err)
+{
+	switch (err) {
+		case ERROR_ALREADY_EXISTS:
+		case ERROR_FILE_EXISTS:
+			PR_SetError(PR_FILE_EXISTS_ERROR, err);
+			break;
+		case ERROR_FILE_NOT_FOUND:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case ERROR_ACCESS_DENIED:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case ERROR_INVALID_ADDRESS:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ERROR_INVALID_NAME:
+			PR_SetError(PR_INVALID_ARGUMENT_ERROR, err);
+			break;
+		case ERROR_NOT_READY:
+		case ERROR_OPEN_FAILED:
+		case ERROR_PATH_BUSY:
+			PR_SetError(PR_IO_ERROR, err);
+			break;
+		case ERROR_DRIVE_LOCKED:
+			PR_SetError(PR_FILE_IS_LOCKED_ERROR, err);
+			break;
+		case ERROR_FILENAME_EXCED_RANGE:
+			PR_SetError(PR_NAME_TOO_LONG_ERROR, err);
+			break;
+		case ERROR_TOO_MANY_OPEN_FILES:
+			PR_SetError(PR_SYS_DESC_TABLE_FULL_ERROR, err);
+			break;
+		case ERROR_PATH_NOT_FOUND:
+			PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+			break;
+		case ERROR_NOT_ENOUGH_MEMORY:
+		case ERROR_MORE_DATA:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		case ERROR_DISK_FULL:
+		case ERROR_HANDLE_DISK_FULL:
+			PR_SetError(PR_NO_DEVICE_SPACE_ERROR, err);
+			break;
+		case ERROR_WRITE_PROTECT:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+	}
+}
+
+void _MD_os2_map_gethostname_error(PRInt32 err)
+{
+    switch (err) {
+#ifdef SOCEFAULT
+		case SOCEFAULT:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+#endif
+		case ENETDOWN:
+		case EINPROGRESS:
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+    }
+}
+
+void _MD_os2_map_select_error(PRInt32 err)
+{
+    PRErrorCode prerror;
+
+    switch (err) {
+        /*
+         * OS/2 select() only works on sockets.  So in this
+         * context, ENOTSOCK is equivalent to EBADF on Unix.
+         */
+        case ENOTSOCK:
+            prerror = PR_BAD_DESCRIPTOR_ERROR;
+            break;
+        case EINVAL:
+            prerror = PR_INVALID_ARGUMENT_ERROR;
+            break;
+#ifdef SOCEFAULT
+        case SOCEFAULT:
+            prerror = PR_ACCESS_FAULT_ERROR;
+            break;
+#endif
+        default:
+            prerror = PR_UNKNOWN_ERROR;
+    }
+    PR_SetError(prerror, err);
+}
+
+void _MD_os2_map_lockf_error(PRInt32 err)
+{
+    switch (err) {
+		case ERROR_ACCESS_DENIED:
+			PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, err);
+			break;
+		case ERROR_INVALID_HANDLE:
+			PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+			break;
+		case ERROR_INVALID_ADDRESS:
+			PR_SetError(PR_ACCESS_FAULT_ERROR, err);
+			break;
+		case ERROR_DRIVE_LOCKED:
+		case ERROR_LOCKED:
+		case ERROR_SHARING_VIOLATION:
+			PR_SetError(PR_FILE_IS_LOCKED_ERROR, err);
+			break;
+		case ERROR_NOT_ENOUGH_MEMORY:
+		case ERROR_MORE_DATA:
+			PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, err);
+			break;
+		default:
+			PR_SetError(PR_UNKNOWN_ERROR, err);
+			break;
+    }
+}
diff --git a/nsprpub/pr/src/md/os2/os2cv.c b/nsprpub/pr/src/md/os2/os2cv.c
new file mode 100644
index 000000000..2c424c50b
--- /dev/null
+++ b/nsprpub/pr/src/md/os2/os2cv.c
@@ -0,0 +1,330 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ *  os2cv.c -- OS/2 Machine-Dependent Code for Condition Variables
+ *
+ *  We implement our own condition variable wait queue.  Each thread
+ *  has a semaphore object (thread->md.blocked_sema) to block on while
+ *  waiting on a condition variable.
+ *
+ *  We use a deferred condition notify algorithm.  When PR_NotifyCondVar
+ *  or PR_NotifyAllCondVar is called, the condition notifies are simply
+ *  recorded in the _MDLock structure.  We defer the condition notifies
+ *  until right after we unlock the lock.  This way the awakened threads
+ *  have a better chance to reaquire the lock.
+ */
+ 
+#include "primpl.h"
+
+/*
+ * AddThreadToCVWaitQueueInternal --
+ *
+ * Add the thread to the end of the condition variable's wait queue.
+ * The CV's lock must be locked when this function is called.
+ */
+
+static void
+AddThreadToCVWaitQueueInternal(PRThread *thred, struct _MDCVar *cv)
+{
+    PR_ASSERT((cv->waitTail != NULL && cv->waitHead != NULL)
+            || (cv->waitTail == NULL && cv->waitHead == NULL));
+    cv->nwait += 1;
+    thred->md.inCVWaitQueue = PR_TRUE;
+    thred->md.next = NULL;
+    thred->md.prev = cv->waitTail;
+    if (cv->waitHead == NULL) {
+        cv->waitHead = thred;
+    } else {
+        cv->waitTail->md.next = thred;
+    }
+    cv->waitTail = thred;
+}
+
+/*
+ * md_UnlockAndPostNotifies --
+ *
+ * Unlock the lock, and then do the deferred condition notifies.
+ * If waitThred and waitCV are not NULL, waitThred is added to
+ * the wait queue of waitCV before the lock is unlocked.
+ *
+ * This function is called by _PR_MD_WAIT_CV and _PR_MD_UNLOCK,
+ * the two places where a lock is unlocked.
+ */
+void
+md_UnlockAndPostNotifies(
+    _MDLock *lock,
+    PRThread *waitThred,
+    _MDCVar *waitCV)
+{
+    PRIntn index;
+    _MDNotified post;
+    _MDNotified *notified, *prev = NULL;
+
+    /*
+     * Time to actually notify any conditions that were affected
+     * while the lock was held.  Get a copy of the list that's in
+     * the lock structure and then zero the original.  If it's
+     * linked to other such structures, we own that storage.
+     */
+    post = lock->notified;  /* a safe copy; we own the lock */
+
+#if defined(DEBUG)
+    memset(&lock->notified, 0, sizeof(_MDNotified));  /* reset */
+#else
+    lock->notified.length = 0;  /* these are really sufficient */
+    lock->notified.link = NULL;
+#endif
+
+    /* 
+     * Figure out how many threads we need to wake up.
+     */
+    notified = &post;  /* this is where we start */
+    do {
+        for (index = 0; index < notified->length; ++index) {
+            _MDCVar *cv = notified->cv[index].cv;
+            PRThread *thred;
+            int i;
+            
+            /* Fast special case: no waiting threads */
+            if (cv->waitHead == NULL) {
+                notified->cv[index].notifyHead = NULL;
+                continue;
+            }
+
+            /* General case */
+            if (-1 == notified->cv[index].times) {
+                /* broadcast */
+                thred = cv->waitHead;
+                while (thred != NULL) {
+                    thred->md.inCVWaitQueue = PR_FALSE;
+                    thred = thred->md.next;
+                }
+                notified->cv[index].notifyHead = cv->waitHead;
+                cv->waitHead = cv->waitTail = NULL;
+                cv->nwait = 0;
+            } else {
+                thred = cv->waitHead;
+                i = notified->cv[index].times;
+                while (thred != NULL && i > 0) {
+                    thred->md.inCVWaitQueue = PR_FALSE;
+                    thred = thred->md.next;
+                    i--;
+                }
+                notified->cv[index].notifyHead = cv->waitHead;
+                cv->waitHead = thred;
+                if (cv->waitHead == NULL) {
+                    cv->waitTail = NULL;
+                } else {
+                    if (cv->waitHead->md.prev != NULL) {
+                        cv->waitHead->md.prev->md.next = NULL;
+                        cv->waitHead->md.prev = NULL;
+                    }
+                }
+                cv->nwait -= notified->cv[index].times - i;
+            }
+        }
+        notified = notified->link;
+    } while (NULL != notified);
+
+    if (waitThred) {
+        AddThreadToCVWaitQueueInternal(waitThred, waitCV);
+    }
+
+    /* Release the lock before notifying */
+    DosReleaseMutexSem(lock->mutex);
+
+    notified = &post;  /* this is where we start */
+    do {
+        for (index = 0; index < notified->length; ++index) {
+            PRThread *thred;
+            PRThread *next;
+
+            thred = notified->cv[index].notifyHead;
+            while (thred != NULL) {
+                BOOL rv;
+
+                next = thred->md.next;
+                thred->md.prev = thred->md.next = NULL;
+                rv = DosPostEventSem(thred->md.blocked_sema);
+                PR_ASSERT(rv == NO_ERROR);
+                thred = next;
+            }
+        }
+        prev = notified;
+        notified = notified->link;
+        if (&post != prev) PR_DELETE(prev);
+    } while (NULL != notified);
+}
+
+/*
+ * Notifies just get posted to the protecting mutex.  The
+ * actual notification is done when the lock is released so that
+ * MP systems don't contend for a lock that they can't have.
+ */
+static void md_PostNotifyToCvar(_MDCVar *cvar, _MDLock *lock,
+        PRBool broadcast)
+{
+    PRIntn index = 0;
+    _MDNotified *notified = &lock->notified;
+
+    while (1) {
+        for (index = 0; index < notified->length; ++index) {
+            if (notified->cv[index].cv == cvar) {
+                if (broadcast) {
+                    notified->cv[index].times = -1;
+                } else if (-1 != notified->cv[index].times) {
+                    notified->cv[index].times += 1;
+                }
+                return;
+            }
+        }
+        /* if not full, enter new CV in this array */
+        if (notified->length < _MD_CV_NOTIFIED_LENGTH) break;
+
+        /* if there's no link, create an empty array and link it */
+        if (NULL == notified->link) {
+            notified->link = PR_NEWZAP(_MDNotified);
+        }
+
+        notified = notified->link;
+    }
+
+    /* A brand new entry in the array */
+    notified->cv[index].times = (broadcast) ? -1 : 1;
+    notified->cv[index].cv = cvar;
+    notified->length += 1;
+}
+
+/*
+ * _PR_MD_NEW_CV() -- Creating new condition variable
+ * ... Solaris uses cond_init() in similar function.
+ *
+ * returns: -1 on failure
+ *          0 when it succeeds.
+ *
+ */
+PRInt32
+_PR_MD_NEW_CV(_MDCVar *cv)
+{
+    cv->magic = _MD_MAGIC_CV;
+    /*
+     * The waitHead, waitTail, and nwait fields are zeroed
+     * when the PRCondVar structure is created.
+     */
+    return 0;
+} 
+
+void _PR_MD_FREE_CV(_MDCVar *cv)
+{
+    cv->magic = (PRUint32)-1;
+    return;
+}
+
+/*
+ *  _PR_MD_WAIT_CV() -- Wait on condition variable
+ */
+void
+_PR_MD_WAIT_CV(_MDCVar *cv, _MDLock *lock, PRIntervalTime timeout )
+{
+    PRThread *thred = _PR_MD_CURRENT_THREAD();
+    ULONG rv, count;
+    ULONG msecs = (timeout == PR_INTERVAL_NO_TIMEOUT) ?
+            SEM_INDEFINITE_WAIT : PR_IntervalToMilliseconds(timeout);
+
+    /*
+     * If we have pending notifies, post them now.
+     */
+    if (0 != lock->notified.length) {
+        md_UnlockAndPostNotifies(lock, thred, cv);
+    } else {
+        AddThreadToCVWaitQueueInternal(thred, cv);
+        DosReleaseMutexSem(lock->mutex); 
+    }
+
+    /* Wait for notification or timeout; don't really care which */
+    rv = DosWaitEventSem(thred->md.blocked_sema, msecs);
+    if (rv == NO_ERROR) {
+        DosResetEventSem(thred->md.blocked_sema, &count);
+    }
+
+    DosRequestMutexSem((lock->mutex), SEM_INDEFINITE_WAIT);
+
+    PR_ASSERT(rv == NO_ERROR || rv == ERROR_TIMEOUT);
+
+    if(rv == ERROR_TIMEOUT)
+    {
+       if (thred->md.inCVWaitQueue) {
+           PR_ASSERT((cv->waitTail != NULL && cv->waitHead != NULL)
+                   || (cv->waitTail == NULL && cv->waitHead == NULL));
+           cv->nwait -= 1;
+           thred->md.inCVWaitQueue = PR_FALSE;
+           if (cv->waitHead == thred) {
+               cv->waitHead = thred->md.next;
+               if (cv->waitHead == NULL) {
+                   cv->waitTail = NULL;
+               } else {
+                   cv->waitHead->md.prev = NULL;
+               }
+           } else {
+               PR_ASSERT(thred->md.prev != NULL);
+               thred->md.prev->md.next = thred->md.next;
+               if (thred->md.next != NULL) {
+                   thred->md.next->md.prev = thred->md.prev;
+               } else {
+                   PR_ASSERT(cv->waitTail == thred);
+                   cv->waitTail = thred->md.prev;
+               }
+           }
+           thred->md.next = thred->md.prev = NULL;
+       } else {
+           /*
+            * This thread must have been notified, but the
+            * SemRelease call happens after SemRequest
+            * times out.  Wait on the semaphore again to make it
+            * non-signaled.  We assume this wait won't take long.
+            */
+           rv = DosWaitEventSem(thred->md.blocked_sema, SEM_INDEFINITE_WAIT);
+           if (rv == NO_ERROR) {
+               DosResetEventSem(thred->md.blocked_sema, &count);
+           }
+           PR_ASSERT(rv == NO_ERROR);
+       }
+    }
+    PR_ASSERT(thred->md.inCVWaitQueue == PR_FALSE);
+    return;
+} /* --- end _PR_MD_WAIT_CV() --- */
+
+void
+_PR_MD_NOTIFY_CV(_MDCVar *cv, _MDLock *lock)
+{
+    md_PostNotifyToCvar(cv, lock, PR_FALSE);
+    return;
+}
+
+PRStatus
+_PR_MD_NEW_LOCK(_MDLock *lock)
+{
+    DosCreateMutexSem(0, &(lock->mutex), 0, 0);
+    (lock)->notified.length=0;
+    (lock)->notified.link=NULL;
+    return PR_SUCCESS;
+}
+
+void
+_PR_MD_NOTIFYALL_CV(_MDCVar *cv, _MDLock *lock)
+{
+    md_PostNotifyToCvar(cv, lock, PR_TRUE);
+    return;
+}
+
+void _PR_MD_UNLOCK(_MDLock *lock)
+{
+    if (0 != lock->notified.length) {
+        md_UnlockAndPostNotifies(lock, NULL, NULL);
+    } else {
+        DosReleaseMutexSem(lock->mutex);
+    }
+}
diff --git a/nsprpub/pr/src/md/os2/os2emx.s b/nsprpub/pr/src/md/os2/os2emx.s
new file mode 100644
index 000000000..ef18e3bb1
--- /dev/null
+++ b/nsprpub/pr/src/md/os2/os2emx.s
@@ -0,0 +1,82 @@
+/ -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+/ 
+/ This Source Code Form is subject to the terms of the Mozilla Public
+/ License, v. 2.0. If a copy of the MPL was not distributed with this
+/ file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/ PRInt32 __PR_MD_ATOMIC_INCREMENT(PRInt32 *val)
+/
+/ Atomically increment the integer pointed to by 'val' and return
+/ the result of the increment.
+/
+    .text
+    .globl __PR_MD_ATOMIC_INCREMENT
+    .align 4
+__PR_MD_ATOMIC_INCREMENT:
+    movl 4(%esp), %ecx
+    movl $1, %eax
+    lock
+    xaddl %eax, (%ecx)
+    incl %eax
+    ret
+
+/ PRInt32 __PR_MD_ATOMIC_DECREMENT(PRInt32 *val)
+/
+/ Atomically decrement the integer pointed to by 'val' and return
+/ the result of the decrement.
+/
+    .text
+    .globl __PR_MD_ATOMIC_DECREMENT
+    .align 4
+__PR_MD_ATOMIC_DECREMENT:
+    movl 4(%esp), %ecx
+    movl $-1, %eax
+    lock
+    xaddl %eax, (%ecx)
+    decl %eax
+    ret
+
+/ PRInt32 __PR_MD_ATOMIC_SET(PRInt32 *val, PRInt32 newval)
+/
+/ Atomically set the integer pointed to by 'val' to the new
+/ value 'newval' and return the old value.
+/
+/ An alternative implementation:
+/   .text
+/   .globl __PR_MD_ATOMIC_SET
+/   .align 4
+/__PR_MD_ATOMIC_SET:
+/   movl 4(%esp), %ecx
+/   movl 8(%esp), %edx
+/   movl (%ecx), %eax
+/retry:
+/   lock
+/   cmpxchgl %edx, (%ecx)
+/   jne retry
+/   ret
+/
+    .text
+    .globl __PR_MD_ATOMIC_SET
+    .align 4
+__PR_MD_ATOMIC_SET:
+    movl 4(%esp), %ecx
+    movl 8(%esp), %eax
+    xchgl %eax, (%ecx)
+    ret
+
+/ PRInt32 __PR_MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 val)
+/
+/ Atomically add 'val' to the integer pointed to by 'ptr'
+/ and return the result of the addition.
+/
+    .text
+    .globl __PR_MD_ATOMIC_ADD
+    .align 4
+__PR_MD_ATOMIC_ADD:
+    movl 4(%esp), %ecx
+    movl 8(%esp), %eax
+    movl %eax, %edx
+    lock
+    xaddl %eax, (%ecx)
+    addl %edx, %eax
+    ret
diff --git a/nsprpub/pr/src/md/os2/os2gc.c b/nsprpub/pr/src/md/os2/os2gc.c
new file mode 100644
index 000000000..2bcbf7852
--- /dev/null
+++ b/nsprpub/pr/src/md/os2/os2gc.c
@@ -0,0 +1,58 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * GC related routines
+ *
+ */
+#include "primpl.h"
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np) 
+{
+    CONTEXTRECORD context;
+    context.ContextFlags = CONTEXT_INTEGER;
+
+    if (_PR_IS_NATIVE_THREAD(t)) {
+        context.ContextFlags |= CONTEXT_CONTROL;
+        if (QueryThreadContext(t->md.handle, CONTEXT_CONTROL, &context)) {
+            t->md.gcContext[0] = context.ctx_RegEax;
+            t->md.gcContext[1] = context.ctx_RegEbx;
+            t->md.gcContext[2] = context.ctx_RegEcx;
+            t->md.gcContext[3] = context.ctx_RegEdx;
+            t->md.gcContext[4] = context.ctx_RegEsi;
+            t->md.gcContext[5] = context.ctx_RegEdi;
+            t->md.gcContext[6] = context.ctx_RegEsp;
+            t->md.gcContext[7] = context.ctx_RegEbp;
+            *np = PR_NUM_GCREGS;
+        } else {
+            PR_ASSERT(0);/* XXX */
+        }
+    }
+    return (PRWord *)&t->md.gcContext;
+}
+
+/* This function is not used right now, but is left as a reference.
+ * If you ever need to get the fiberID from the currently running fiber, 
+ * this is it.
+ */
+void *
+GetMyFiberID()
+{
+    void *fiberData = 0;
+
+    /* A pointer to our tib entry is found at FS:[18]
+     * At offset 10h is the fiberData pointer.  The context of the 
+     * fiber is stored in there.  
+     */
+#ifdef HAVE_ASM
+    __asm {
+        mov    EDX, FS:[18h]
+        mov    EAX, DWORD PTR [EDX+10h]
+        mov    [fiberData], EAX
+    }
+#endif
+  
+    return fiberData;
+}
diff --git a/nsprpub/pr/src/md/os2/os2inrval.c b/nsprpub/pr/src/md/os2/os2inrval.c
new file mode 100644
index 000000000..aff99e2ec
--- /dev/null
+++ b/nsprpub/pr/src/md/os2/os2inrval.c
@@ -0,0 +1,80 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * OS/2 interval timers
+ *
+ */
+
+#include "primpl.h"
+
+static PRBool useHighResTimer = PR_FALSE;
+PRIntervalTime _os2_ticksPerSec = -1;
+PRIntn _os2_bitShift = 0;
+PRInt32 _os2_highMask = 0;
+   
+void
+_PR_MD_INTERVAL_INIT()
+{
+    char *envp;
+    ULONG timerFreq;
+    APIRET rc;
+
+    if ((envp = getenv("NSPR_OS2_NO_HIRES_TIMER")) != NULL) {
+        if (atoi(envp) == 1)
+           return;
+    }
+
+    timerFreq = 0; /* OS/2 high-resolution timer frequency in Hz */
+    rc = DosTmrQueryFreq(&timerFreq);
+    if (NO_ERROR == rc) {
+        useHighResTimer = PR_TRUE;
+        PR_ASSERT(timerFreq != 0);
+        while (timerFreq > PR_INTERVAL_MAX) {
+            timerFreq >>= 1;
+            _os2_bitShift++;
+            _os2_highMask = (_os2_highMask << 1)+1;
+        }
+
+        _os2_ticksPerSec = timerFreq;
+        PR_ASSERT(_os2_ticksPerSec > PR_INTERVAL_MIN);
+    }
+}
+
+PRIntervalTime
+_PR_MD_GET_INTERVAL()
+{
+    if (useHighResTimer) {
+        QWORD timestamp;
+        PRInt32 top;
+        APIRET rc = DosTmrQueryTime(&timestamp);
+        if (NO_ERROR != rc) {
+            return -1;
+        }
+        /* Sadly, nspr requires the interval to range from 1000 ticks per
+         * second to only 100000 ticks per second. DosTmrQueryTime is too
+         * high resolution...
+         */
+        top = timestamp.ulHi & _os2_highMask;
+        top = top << (32 - _os2_bitShift);
+        timestamp.ulLo = timestamp.ulLo >> _os2_bitShift;   
+        timestamp.ulLo = timestamp.ulLo + top; 
+        return (PRUint32)timestamp.ulLo;
+    } else {
+        ULONG msCount = -1;
+        DosQuerySysInfo(QSV_MS_COUNT, QSV_MS_COUNT, &msCount, sizeof(msCount));
+        return msCount;
+    }
+}
+
+PRIntervalTime
+_PR_MD_INTERVAL_PER_SEC()
+{
+    if (useHighResTimer) {
+        return _os2_ticksPerSec;
+    } else {
+        return 1000;
+    }
+}
diff --git a/nsprpub/pr/src/md/os2/os2io.c b/nsprpub/pr/src/md/os2/os2io.c
new file mode 100644
index 000000000..3c81ae346
--- /dev/null
+++ b/nsprpub/pr/src/md/os2/os2io.c
@@ -0,0 +1,942 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* OS2 IO module
+ *
+ * Assumes synchronous I/O.
+ *
+ */
+
+#include "primpl.h"
+#include "prio.h"
+#include <ctype.h>
+#include <string.h>
+#include <limits.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <io.h>
+
+struct _MDLock               _pr_ioq_lock;
+
+static PRBool isWSEB = PR_FALSE; /* whether we are using an OS/2 kernel that supports large files */
+
+typedef APIRET (*DosOpenLType)(PSZ pszFileName, PHFILE pHf, PULONG pulAction,
+                            LONGLONG cbFile, ULONG ulAttribute,
+                            ULONG fsOpenFlags, ULONG fsOpenMode,
+                            PEAOP2 peaop2);
+
+typedef APIRET (*DosSetFileLocksLType)(HFILE hFile, PFILELOCKL pflUnlock,
+                                    PFILELOCKL pflLock, ULONG timeout,
+                                    ULONG flags);
+
+typedef APIRET (*DosSetFilePtrLType)(HFILE hFile, LONGLONG ib, ULONG method,
+                                  PLONGLONG ibActual);
+
+DosOpenLType myDosOpenL;
+DosSetFileLocksLType myDosSetFileLocksL;
+DosSetFilePtrLType myDosSetFilePtrL;
+
+void
+_PR_MD_INIT_IO()
+{
+    APIRET rc;
+    HMODULE module;
+
+    sock_init();
+    
+    rc = DosLoadModule(NULL, 0, "DOSCALL1", &module);
+    if (rc != NO_ERROR)
+    {
+        return;
+    }
+    rc = DosQueryProcAddr(module, 981, NULL, (PFN*) &myDosOpenL);
+    if (rc != NO_ERROR)
+    {
+        return;
+    }
+    rc = DosQueryProcAddr(module, 986, NULL, (PFN*) &myDosSetFileLocksL);
+    if (rc != NO_ERROR)
+    {
+        return;
+    }
+    rc = DosQueryProcAddr(module, 988, NULL, (PFN*) &myDosSetFilePtrL);
+    if (rc != NO_ERROR)
+    {
+        return;
+    }
+    isWSEB = PR_TRUE;
+}
+
+PRStatus
+_PR_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PRInt32 rv;
+    ULONG count;
+
+    PRUint32 msecs = (ticks == PR_INTERVAL_NO_TIMEOUT) ?
+        SEM_INDEFINITE_WAIT : PR_IntervalToMilliseconds(ticks);
+    rv = DosWaitEventSem(thread->md.blocked_sema, msecs);
+    DosResetEventSem(thread->md.blocked_sema, &count); 
+    switch(rv) 
+    {
+        case NO_ERROR:
+            return PR_SUCCESS;
+            break;
+        case ERROR_TIMEOUT:
+            _PR_THREAD_LOCK(thread);
+            if (thread->state == _PR_IO_WAIT) {
+			  ;
+            } else {
+                if (thread->wait.cvar != NULL) {
+                    thread->wait.cvar = NULL;
+                    _PR_THREAD_UNLOCK(thread);
+                } else {
+                    /* The CVAR was notified just as the timeout
+                     * occurred.  This led to us being notified twice.
+                     * call SemRequest() to clear the semaphore.
+                     */
+                    _PR_THREAD_UNLOCK(thread);
+                    rv = DosWaitEventSem(thread->md.blocked_sema, 0);
+                    DosResetEventSem(thread->md.blocked_sema, &count); 
+                    PR_ASSERT(rv == NO_ERROR);
+                }
+            }
+            return PR_SUCCESS;
+            break;
+        default:
+            break;
+    }
+    return PR_FAILURE;
+}
+PRStatus
+_PR_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if ( _PR_IS_NATIVE_THREAD(thread) ) 
+    {
+        if (DosPostEventSem(thread->md.blocked_sema) != NO_ERROR)
+            return PR_FAILURE;
+        else
+			return PR_SUCCESS;
+	}
+}
+
+
+/* --- FILE IO ----------------------------------------------------------- */
+/*
+ *  _PR_MD_OPEN() -- Open a file
+ *
+ *  returns: a fileHandle
+ *
+ *  The NSPR open flags (osflags) are translated into flags for OS/2
+ *
+ *  Mode seems to be passed in as a unix style file permissions argument
+ *  as in 0666, in the case of opening the logFile. 
+ *
+ */
+PRInt32
+_PR_MD_OPEN(const char *name, PRIntn osflags, int mode)
+{
+    HFILE file;
+    PRInt32 access = OPEN_SHARE_DENYNONE;
+    PRInt32 flags = 0L;
+    APIRET rc = 0;
+    PRUword actionTaken;
+
+#ifdef MOZ_OS2_HIGH_MEMORY
+    /*
+     * All the pointer arguments (&file, &actionTaken and name) have to be in
+     * low memory for DosOpen to use them.
+     * The following moves name to low memory.
+     */ 
+    if ((ULONG)name >= 0x20000000)
+    {
+        size_t len = strlen(name) + 1;
+        char *copy = (char *)alloca(len);
+        memcpy(copy, name, len);
+        name = copy;
+    }
+#endif
+
+    if (osflags & PR_SYNC) access |= OPEN_FLAGS_WRITE_THROUGH;
+
+    if (osflags & PR_RDONLY)
+        access |= OPEN_ACCESS_READONLY;
+    else if (osflags & PR_WRONLY)
+        access |= OPEN_ACCESS_WRITEONLY;
+    else if(osflags & PR_RDWR)
+        access |= OPEN_ACCESS_READWRITE;
+
+    if ( osflags & PR_CREATE_FILE && osflags & PR_EXCL )
+    {
+        flags = OPEN_ACTION_CREATE_IF_NEW | OPEN_ACTION_FAIL_IF_EXISTS;
+    }
+    else if (osflags & PR_CREATE_FILE)
+    {
+        if (osflags & PR_TRUNCATE)
+            flags = OPEN_ACTION_CREATE_IF_NEW | OPEN_ACTION_REPLACE_IF_EXISTS;
+        else
+            flags = OPEN_ACTION_CREATE_IF_NEW | OPEN_ACTION_OPEN_IF_EXISTS;
+    } 
+    else
+    {
+        if (osflags & PR_TRUNCATE)
+            flags = OPEN_ACTION_FAIL_IF_NEW | OPEN_ACTION_REPLACE_IF_EXISTS;
+        else
+            flags = OPEN_ACTION_FAIL_IF_NEW | OPEN_ACTION_OPEN_IF_EXISTS;
+    }
+
+    do {
+        if (isWSEB)
+        {
+                rc = myDosOpenL((char*)name,
+                     &file,            /* file handle if successful */
+                     &actionTaken,     /* reason for failure        */
+                     0,                /* initial size of new file  */
+                     FILE_NORMAL,      /* file system attributes    */
+                     flags,            /* Open flags                */
+                     access,           /* Open mode and rights      */
+                     0);               /* OS/2 Extended Attributes  */
+        }
+        else
+        {
+                rc = DosOpen((char*)name,
+                     &file,            /* file handle if successful */
+                     &actionTaken,     /* reason for failure        */
+                     0,                /* initial size of new file  */
+                     FILE_NORMAL,      /* file system attributes    */
+                     flags,            /* Open flags                */
+                     access,           /* Open mode and rights      */
+                     0);               /* OS/2 Extended Attributes  */
+        };
+        if (rc == ERROR_TOO_MANY_OPEN_FILES) {
+            ULONG CurMaxFH = 0;
+            LONG ReqCount = 20;
+            APIRET rc2;
+            rc2 = DosSetRelMaxFH(&ReqCount, &CurMaxFH);
+            if (rc2 != NO_ERROR) {
+                break;
+            }
+        }
+    } while (rc == ERROR_TOO_MANY_OPEN_FILES);
+
+    if (rc != NO_ERROR) {
+        _PR_MD_MAP_OPEN_ERROR(rc);
+        return -1; 
+    }
+
+    return (PRInt32)file;
+}
+
+PRInt32
+_PR_MD_READ(PRFileDesc *fd, void *buf, PRInt32 len)
+{
+    ULONG bytes;
+    int rv;
+
+    rv = DosRead((HFILE)fd->secret->md.osfd,
+                 (PVOID)buf,
+                 len,
+                 &bytes);
+    
+    if (rv != NO_ERROR) 
+    {
+        /* ERROR_HANDLE_EOF can only be returned by async io */
+        PR_ASSERT(rv != ERROR_HANDLE_EOF);
+        if (rv == ERROR_BROKEN_PIPE)
+            return 0;
+		else {
+			_PR_MD_MAP_READ_ERROR(rv);
+        return -1;
+    }
+    }
+    return (PRInt32)bytes;
+}
+
+PRInt32
+_PR_MD_WRITE(PRFileDesc *fd, const void *buf, PRInt32 len)
+{
+    PRInt32 bytes;
+    int rv; 
+
+    rv = DosWrite((HFILE)fd->secret->md.osfd,
+                  (PVOID)buf,
+                  len,
+                  (PULONG)&bytes);
+
+    if (rv != NO_ERROR) 
+    {
+        _PR_MD_MAP_WRITE_ERROR(rv);
+        return -1;
+    }
+
+    if (len != bytes) {
+        rv = ERROR_DISK_FULL;
+        _PR_MD_MAP_WRITE_ERROR(rv);
+        return -1;
+    }
+
+    return bytes;
+} /* --- end _PR_MD_WRITE() --- */
+
+PRInt32
+_PR_MD_LSEEK(PRFileDesc *fd, PRInt32 offset, PRSeekWhence whence)
+{
+    PRInt32 rv;
+    PRUword newLocation;
+
+    rv = DosSetFilePtr((HFILE)fd->secret->md.osfd, offset, whence, &newLocation);
+
+	if (rv != NO_ERROR) {
+		_PR_MD_MAP_LSEEK_ERROR(rv);
+		return -1;
+	} else
+		return newLocation;
+}
+
+PRInt64
+_PR_MD_LSEEK64(PRFileDesc *fd, PRInt64 offset, PRSeekWhence whence)
+{
+#ifdef NO_LONG_LONG
+    PRInt64 result;
+    PRInt32 rv, low = offset.lo, hi = offset.hi;
+    PRUword newLocation;
+
+    rv = DosSetFilePtr((HFILE)fd->secret->md.osfd, low, whence, &newLocation);
+    rv = DosSetFilePtr((HFILE)fd->secret->md.osfd, hi, FILE_CURRENT, &newLocation);
+
+  	if (rv != NO_ERROR) {
+		_PR_MD_MAP_LSEEK_ERROR(rv);
+		hi = newLocation = -1;
+   }
+
+    result.lo = newLocation;
+    result.hi = hi;
+	return result;
+
+#else
+    PRInt32 where, rc, lo = (PRInt32)offset, hi = (PRInt32)(offset >> 32);
+    PRUint64 rv;
+    PRUint32 newLocation, uhi;
+    PRUint64 newLocationL;
+
+    switch (whence)
+      {
+      case PR_SEEK_SET:
+        where = FILE_BEGIN;
+        break;
+      case PR_SEEK_CUR:
+        where = FILE_CURRENT;
+        break;
+      case PR_SEEK_END:
+        where = FILE_END;
+        break;
+      default:
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+        return -1;
+    }
+    if (isWSEB)
+    {
+        rc = myDosSetFilePtrL((HFILE)fd->secret->md.osfd, offset, where, (PLONGLONG)&newLocationL);
+    }
+    else
+    {
+        rc = DosSetFilePtr((HFILE)fd->secret->md.osfd, lo, where, (PULONG)&newLocation);
+    }
+     
+    if (rc != NO_ERROR) {
+      _PR_MD_MAP_LSEEK_ERROR(rc);
+      return -1;
+    }
+    
+    if (isWSEB)
+    {
+        return newLocationL;
+    }
+
+    uhi = (PRUint32)hi;
+    PR_ASSERT((PRInt32)uhi >= 0);
+    rv = uhi;
+    PR_ASSERT((PRInt64)rv >= 0);
+    rv = (rv << 32);
+    PR_ASSERT((PRInt64)rv >= 0);
+    rv += newLocation;
+    PR_ASSERT((PRInt64)rv >= 0);
+    return (PRInt64)rv;
+#endif
+}
+
+PRInt32
+_PR_MD_FSYNC(PRFileDesc *fd)
+{
+    PRInt32 rc = DosResetBuffer((HFILE)fd->secret->md.osfd);
+
+    if (rc != NO_ERROR) {
+   	if (rc != ERROR_ACCESS_DENIED) {	
+   			_PR_MD_MAP_FSYNC_ERROR(rc);
+   	    return -1;
+   	}
+    }
+    return 0;
+}
+
+PRInt32
+_MD_CloseFile(PRInt32 osfd)
+{
+    PRInt32 rv;
+    
+    rv = DosClose((HFILE)osfd);
+ 	if (rv != NO_ERROR)
+		_PR_MD_MAP_CLOSE_ERROR(rv);
+    return rv;
+}
+
+
+/* --- DIR IO ------------------------------------------------------------ */
+#define GetFileFromDIR(d)       (isWSEB?(d)->d_entry.large.achName:(d)->d_entry.small.achName)
+#define GetFileAttr(d)          (isWSEB?(d)->d_entry.large.attrFile:(d)->d_entry.small.attrFile)
+
+void FlipSlashes(char *cp, int len)
+{
+    while (--len >= 0) {
+    if (cp[0] == '/') {
+        cp[0] = PR_DIRECTORY_SEPARATOR;
+    }
+    cp++;
+    }
+}
+
+/*
+**
+** Local implementations of standard Unix RTL functions which are not provided
+** by the VAC RTL.
+**
+*/
+
+PRInt32
+_PR_MD_CLOSE_DIR(_MDDir *d)
+{
+   PRInt32 rc;
+
+    if ( d ) {
+      rc = DosFindClose(d->d_hdl);
+      if(rc == NO_ERROR){
+        d->magic = (PRUint32)-1;
+        return PR_SUCCESS;
+		} else {
+			_PR_MD_MAP_CLOSEDIR_ERROR(rc);
+        	return PR_FAILURE;
+		}
+    }
+    PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+    return PR_FAILURE;
+}
+
+
+PRStatus
+_PR_MD_OPEN_DIR(_MDDir *d, const char *name)
+{
+    char filename[ CCHMAXPATH ];
+    PRUword numEntries, rc;
+
+    numEntries = 1;
+
+    PR_snprintf(filename, CCHMAXPATH, "%s%s%s",
+                name, PR_DIRECTORY_SEPARATOR_STR, "*.*");
+    FlipSlashes( filename, strlen(filename) );
+
+    d->d_hdl = HDIR_CREATE;
+
+    if (isWSEB)
+    {
+        rc = DosFindFirst( filename,
+                           &d->d_hdl,
+                           FILE_DIRECTORY | FILE_HIDDEN,
+                           &(d->d_entry.large),
+                           sizeof(d->d_entry.large),
+                           &numEntries,
+                           FIL_STANDARDL);
+    }
+    else
+    {
+        rc = DosFindFirst( filename,
+                           &d->d_hdl,
+                           FILE_DIRECTORY | FILE_HIDDEN,
+                           &(d->d_entry.small),
+                           sizeof(d->d_entry.small),
+                           &numEntries,
+                           FIL_STANDARD);
+    }
+    if ( rc != NO_ERROR ) {
+		_PR_MD_MAP_OPENDIR_ERROR(rc);
+        return PR_FAILURE;
+    }
+    d->firstEntry = PR_TRUE;
+    d->magic = _MD_MAGIC_DIR;
+    return PR_SUCCESS;
+}
+
+char *
+_PR_MD_READ_DIR(_MDDir *d, PRIntn flags)
+{
+    PRUword numFiles = 1;
+    BOOL rv;
+    char *fileName;
+    USHORT fileAttr;
+
+    if ( d ) {
+       while (1) {
+           if (d->firstEntry) {
+               d->firstEntry = PR_FALSE;
+               rv = NO_ERROR;
+           } else {
+               rv = DosFindNext(d->d_hdl,
+                                &(d->d_entry),
+                                sizeof(d->d_entry),
+                                &numFiles);
+           }
+           if (rv != NO_ERROR) {
+               break;
+           }
+           fileName = GetFileFromDIR(d);
+           fileAttr = GetFileAttr(d);
+           if ( (flags & PR_SKIP_DOT) &&
+                (fileName[0] == '.') && (fileName[1] == '\0'))
+                continue;
+           if ( (flags & PR_SKIP_DOT_DOT) &&
+                (fileName[0] == '.') && (fileName[1] == '.') &&
+                (fileName[2] == '\0'))
+                continue;
+			/*
+			 * XXX
+			 * Is this the correct definition of a hidden file on OS/2?
+			 */
+           if ((flags & PR_SKIP_NONE) && (fileAttr & FILE_HIDDEN))
+                return fileName;
+           else if ((flags & PR_SKIP_HIDDEN) && (fileAttr & FILE_HIDDEN))
+                continue;
+           return fileName;
+        }
+        PR_ASSERT(NO_ERROR != rv);
+			_PR_MD_MAP_READDIR_ERROR(rv);
+        return NULL;
+		}
+    PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+    return NULL;
+}
+
+PRInt32
+_PR_MD_DELETE(const char *name)
+{
+    PRInt32 rc = DosDelete((char*)name);
+    if(rc == NO_ERROR) {
+        return 0;
+    } else {
+		_PR_MD_MAP_DELETE_ERROR(rc);
+        return -1;
+    }
+}
+
+PRInt32
+_PR_MD_STAT(const char *fn, struct stat *info)
+{
+    PRInt32 rv;
+    char filename[CCHMAXPATH];
+
+    PR_snprintf(filename, CCHMAXPATH, "%s", fn);
+    FlipSlashes(filename, strlen(filename));
+
+    rv = _stat((char*)filename, info);
+    if (-1 == rv) {
+        /*
+         * Check for MSVC runtime library _stat() bug.
+         * (It's really a bug in FindFirstFile().)
+         * If a pathname ends in a backslash or slash,
+         * e.g., c:\temp\ or c:/temp/, _stat() will fail.
+         * Note: a pathname ending in a slash (e.g., c:/temp/)
+         * can be handled by _stat() on NT but not on Win95.
+         *
+         * We remove the backslash or slash at the end and
+         * try again.  
+         *
+         * Not sure if this happens on OS/2 or not,
+         * but it doesn't hurt to be careful.
+         */
+
+        int len = strlen(fn);
+        if (len > 0 && len <= _MAX_PATH
+                && (fn[len - 1] == '\\' || fn[len - 1] == '/')) {
+            char newfn[_MAX_PATH + 1];
+
+            strcpy(newfn, fn);
+            newfn[len - 1] = '\0';
+            rv = _stat(newfn, info);
+        }
+    }
+
+    if (-1 == rv) {
+        _PR_MD_MAP_STAT_ERROR(errno);
+    }
+    return rv;
+}
+
+PRInt32
+_PR_MD_GETFILEINFO(const char *fn, PRFileInfo *info)
+{
+    struct stat sb;
+    PRInt32 rv;
+    PRInt64 s, s2us;
+ 
+    if ( (rv = _PR_MD_STAT(fn, &sb)) == 0 ) {
+        if (info) {
+            if (S_IFREG & sb.st_mode)
+                info->type = PR_FILE_FILE ;
+            else if (S_IFDIR & sb.st_mode)
+                info->type = PR_FILE_DIRECTORY;
+            else
+                info->type = PR_FILE_OTHER;
+            info->size = sb.st_size;
+            LL_I2L(s2us, PR_USEC_PER_SEC);
+            LL_I2L(s, sb.st_mtime);
+            LL_MUL(s, s, s2us);
+            info->modifyTime = s;
+            LL_I2L(s, sb.st_ctime);
+            LL_MUL(s, s, s2us);
+            info->creationTime = s;
+        }
+    }
+    return rv;
+}
+
+PRInt32
+_PR_MD_GETFILEINFO64(const char *fn, PRFileInfo64 *info)
+{
+    PRFileInfo info32;
+    PRInt32 rv = _PR_MD_GETFILEINFO(fn, &info32);
+    if (rv != 0)
+    {
+        return rv;
+    }
+    info->type = info32.type;
+    LL_UI2L(info->size,info32.size);
+    info->modifyTime = info32.modifyTime;
+    info->creationTime = info32.creationTime;
+    
+    if (isWSEB)
+    {
+        APIRET rc ;
+        FILESTATUS3L fstatus;
+
+        rc = DosQueryPathInfo(fn, FIL_STANDARDL, &fstatus, sizeof(fstatus));
+
+        if (NO_ERROR != rc)
+        {
+            _PR_MD_MAP_OPEN_ERROR(rc);
+            return -1;
+        }
+
+        if (! (fstatus.attrFile & FILE_DIRECTORY))
+        {
+            info->size = fstatus.cbFile;
+        }
+    }
+
+    return rv;
+}
+
+PRInt32
+_PR_MD_GETOPENFILEINFO(const PRFileDesc *fd, PRFileInfo *info)
+{
+   /* For once, the VAC compiler/library did a nice thing.
+    * The file handle used by the C runtime is the same one
+    * returned by the OS when you call DosOpen().  This means
+    * that you can take an OS HFILE and use it with C file
+    * functions.  The only caveat is that you have to call
+    * _setmode() first to initialize some junk.  This is
+    * immensely useful because I did not have a clue how to
+    * implement this function otherwise.  The windows folks
+    * took the source from the Microsoft C library source, but
+    * IBM wasn't kind enough to ship the source with VAC.
+    * On second thought, the needed function could probably
+    * be gotten from the OS/2 GNU library source, but the
+    * point is now moot.
+    */
+   struct stat hinfo;
+    PRInt64 s, s2us;
+
+    _setmode(fd->secret->md.osfd, O_BINARY);
+    if(fstat((int)fd->secret->md.osfd, &hinfo) != NO_ERROR) {
+		_PR_MD_MAP_FSTAT_ERROR(errno);
+        return -1;
+	}
+
+    if (hinfo.st_mode & S_IFDIR)
+        info->type = PR_FILE_DIRECTORY;
+    else
+        info->type = PR_FILE_FILE;
+
+    info->size = hinfo.st_size;
+    LL_I2L(s2us, PR_USEC_PER_SEC);
+    LL_I2L(s, hinfo.st_mtime);
+    LL_MUL(s, s, s2us);
+    info->modifyTime = s;
+    LL_I2L(s, hinfo.st_ctime);
+    LL_MUL(s, s, s2us);
+    info->creationTime = s;
+
+    return 0;
+}
+
+PRInt32
+_PR_MD_GETOPENFILEINFO64(const PRFileDesc *fd, PRFileInfo64 *info)
+{
+    PRFileInfo info32;
+    PRInt32 rv = _PR_MD_GETOPENFILEINFO(fd, &info32);
+    if (0 == rv)
+    {
+       info->type = info32.type;
+       LL_UI2L(info->size,info32.size);
+    
+       info->modifyTime = info32.modifyTime;
+       info->creationTime = info32.creationTime;
+    }
+    
+    if (isWSEB)
+    {
+        APIRET rc ;
+        FILESTATUS3L fstatus;
+
+        rc = DosQueryFileInfo(fd->secret->md.osfd, FIL_STANDARDL, &fstatus, sizeof(fstatus));
+
+        if (NO_ERROR != rc)
+        {
+            _PR_MD_MAP_OPEN_ERROR(rc);
+            return -1;
+        }
+
+        if (! (fstatus.attrFile & FILE_DIRECTORY))
+        {
+            info->size = fstatus.cbFile;
+        }
+    }
+
+    return rv;
+}
+
+
+PRInt32
+_PR_MD_RENAME(const char *from, const char *to)
+{
+   PRInt32 rc;
+    /* Does this work with dot-relative pathnames? */
+    if ( (rc = DosMove((char *)from, (char *)to)) == NO_ERROR) {
+        return 0;
+    } else {
+		_PR_MD_MAP_RENAME_ERROR(rc);
+        return -1;
+    }
+}
+
+PRInt32
+_PR_MD_ACCESS(const char *name, PRAccessHow how)
+{
+  PRInt32 rv;
+    switch (how) {
+      case PR_ACCESS_WRITE_OK:
+        rv = access(name, 02);
+		break;
+      case PR_ACCESS_READ_OK:
+        rv = access(name, 04);
+		break;
+      case PR_ACCESS_EXISTS:
+        return access(name, 00);
+	  	break;
+      default:
+		PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+		return -1;
+    }
+	if (rv < 0)
+		_PR_MD_MAP_ACCESS_ERROR(errno);
+    return rv;
+}
+
+PRInt32
+_PR_MD_MKDIR(const char *name, PRIntn mode)
+{
+   PRInt32 rc;
+    /* XXXMB - how to translate the "mode"??? */
+    if ((rc = DosCreateDir((char *)name, NULL))== NO_ERROR) {
+        return 0;
+    } else {
+		_PR_MD_MAP_MKDIR_ERROR(rc);
+        return -1;
+    }
+}
+
+PRInt32
+_PR_MD_RMDIR(const char *name)
+{
+   PRInt32 rc;
+    if ( (rc = DosDeleteDir((char *)name)) == NO_ERROR) {
+        return 0;
+    } else {
+		_PR_MD_MAP_RMDIR_ERROR(rc);
+        return -1;
+    }
+}
+
+PRStatus
+_PR_MD_LOCKFILE(PRInt32 f)
+{
+    PRInt32   rv;
+    FILELOCK lock, unlock;
+    FILELOCKL lockL, unlockL;
+    
+    lock.lOffset = 0;
+    lockL.lOffset = 0;
+    lock.lRange = 0xffffffff;
+    lockL.lRange =  0xffffffffffffffff;
+    unlock.lOffset = 0;
+    unlock.lRange = 0;
+    unlockL.lOffset = 0;
+    unlockL.lRange = 0;
+
+    /*
+     * loop trying to DosSetFileLocks(),
+     * pause for a few miliseconds when can't get the lock
+     * and try again
+     */
+    for( rv = FALSE; rv == FALSE; /* do nothing */ )
+    {
+        if (isWSEB)
+        {
+	    rv = myDosSetFileLocksL( (HFILE) f,
+			                    &unlockL, &lockL,
+			                    0, 0);
+        }
+        else
+        {
+	    rv = DosSetFileLocks( (HFILE) f,
+			                    &unlock, &lock,
+			                    0, 0);
+        }
+		if ( rv != NO_ERROR )
+        {
+            DosSleep( 50 );  /* Sleep() a few milisecs and try again. */
+        }            
+    } /* end for() */
+    return PR_SUCCESS;
+} /* end _PR_MD_LOCKFILE() */
+
+PRStatus
+_PR_MD_TLOCKFILE(PRInt32 f)
+{
+    return _PR_MD_LOCKFILE(f);
+} /* end _PR_MD_TLOCKFILE() */
+
+
+PRStatus
+_PR_MD_UNLOCKFILE(PRInt32 f)
+{
+    PRInt32   rv;
+    FILELOCK lock, unlock;
+    FILELOCKL lockL, unlockL;
+    
+    lock.lOffset = 0;
+    lockL.lOffset = 0;
+    lock.lRange = 0;
+    lockL.lRange = 0;
+    unlock.lOffset = 0;
+    unlockL.lOffset = 0;
+    unlock.lRange = 0xffffffff;
+    unlockL.lRange = 0xffffffffffffffff;
+    
+    if (isWSEB)
+    {
+        rv = myDosSetFileLocksL( (HFILE) f,
+                                        &unlockL, &lockL,
+                                        0, 0);
+    }
+    else
+    {
+        rv = DosSetFileLocks( (HFILE) f,
+                                    &unlock, &lock,
+                                    0, 0);
+    }
+            
+    if ( rv != NO_ERROR )
+    {
+        return PR_SUCCESS;
+    }
+    else
+    {
+        return PR_FAILURE;
+    }
+} /* end _PR_MD_UNLOCKFILE() */
+
+PRStatus
+_PR_MD_SET_FD_INHERITABLE(PRFileDesc *fd, PRBool inheritable)
+{
+    APIRET rc = 0;
+    ULONG flags;
+    switch (fd->methods->file_type)
+    {
+        case PR_DESC_PIPE:
+        case PR_DESC_FILE:
+            rc = DosQueryFHState((HFILE)fd->secret->md.osfd, &flags);
+            if (rc != NO_ERROR) {
+                PR_SetError(PR_UNKNOWN_ERROR, _MD_ERRNO());
+                return PR_FAILURE;
+            }
+
+            if (inheritable)
+              flags &= ~OPEN_FLAGS_NOINHERIT;
+            else
+              flags |= OPEN_FLAGS_NOINHERIT;
+
+            /* Mask off flags DosSetFHState don't want. */
+            flags &= (OPEN_FLAGS_WRITE_THROUGH | OPEN_FLAGS_FAIL_ON_ERROR | OPEN_FLAGS_NO_CACHE | OPEN_FLAGS_NOINHERIT);
+            rc = DosSetFHState((HFILE)fd->secret->md.osfd, flags);
+            if (rc != NO_ERROR) {
+                PR_SetError(PR_UNKNOWN_ERROR, _MD_ERRNO());
+                return PR_FAILURE;
+            }
+            break;
+
+        case PR_DESC_LAYERED:
+            /* what to do here? */
+            PR_SetError(PR_UNKNOWN_ERROR, 87 /*ERROR_INVALID_PARAMETER*/);
+            return PR_FAILURE;
+
+        case PR_DESC_SOCKET_TCP:
+        case PR_DESC_SOCKET_UDP:
+            /* These are global on OS/2. */
+            break;
+    }
+
+    return PR_SUCCESS;
+}
+
+void
+_PR_MD_INIT_FD_INHERITABLE(PRFileDesc *fd, PRBool imported)
+{
+    /* XXX this function needs to be implemented */
+    fd->secret->inheritable = _PR_TRI_UNKNOWN;
+}
+
+void
+_PR_MD_QUERY_FD_INHERITABLE(PRFileDesc *fd)
+{
+    /* XXX this function needs to be reviewed */
+    ULONG flags;
+
+    PR_ASSERT(_PR_TRI_UNKNOWN == fd->secret->inheritable);
+    if (DosQueryFHState((HFILE)fd->secret->md.osfd, &flags) == 0) {
+        if (flags & OPEN_FLAGS_NOINHERIT) {
+            fd->secret->inheritable = _PR_TRI_FALSE;
+        } else {
+            fd->secret->inheritable = _PR_TRI_TRUE;
+        }
+    }
+}
diff --git a/nsprpub/pr/src/md/os2/os2misc.c b/nsprpub/pr/src/md/os2/os2misc.c
new file mode 100644
index 000000000..f0e3ceeaf
--- /dev/null
+++ b/nsprpub/pr/src/md/os2/os2misc.c
@@ -0,0 +1,619 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * os2misc.c
+ *
+ */
+
+#ifdef MOZ_OS2_HIGH_MEMORY
+/* os2safe.h has to be included before os2.h, needed for high mem */
+#include <os2safe.h>
+#endif
+
+#include <string.h>
+#include "primpl.h"
+
+extern int   _CRT_init(void);
+extern void  _CRT_term(void);
+extern void __ctordtorInit(int flag);
+extern void __ctordtorTerm(int flag);
+
+char *
+_PR_MD_GET_ENV(const char *name)
+{
+    return getenv(name);
+}
+
+PRIntn
+_PR_MD_PUT_ENV(const char *name)
+{
+    return putenv(name);
+}
+
+
+/*
+ **************************************************************************
+ **************************************************************************
+ **
+ **     Date and time routines
+ **
+ **************************************************************************
+ **************************************************************************
+ */
+
+#include <sys/timeb.h>
+/*
+ *-----------------------------------------------------------------------
+ *
+ * PR_Now --
+ *
+ *     Returns the current time in microseconds since the epoch.
+ *     The epoch is midnight January 1, 1970 GMT.
+ *     The implementation is machine dependent.  This is the
+ *     implementation for OS/2.
+ *     Cf. time_t time(time_t *tp)
+ *
+ *-----------------------------------------------------------------------
+ */
+
+PR_IMPLEMENT(PRTime)
+PR_Now(void)
+{
+    PRInt64 s, ms, ms2us, s2us;
+    struct timeb b;
+
+    ftime(&b);
+    LL_I2L(ms2us, PR_USEC_PER_MSEC);
+    LL_I2L(s2us, PR_USEC_PER_SEC);
+    LL_I2L(s, b.time);
+    LL_I2L(ms, b.millitm);
+    LL_MUL(ms, ms, ms2us);
+    LL_MUL(s, s, s2us);
+    LL_ADD(s, s, ms);
+    return s;       
+}
+
+
+/*
+ ***********************************************************************
+ ***********************************************************************
+ *
+ * Process creation routines
+ *
+ ***********************************************************************
+ ***********************************************************************
+ */
+
+/*
+ * Assemble the command line by concatenating the argv array.
+ * Special characters intentionally do not get escaped, and it is
+ * expected that the caller wraps arguments in quotes if needed
+ * (e.g. for filename with spaces).
+ *
+ * On success, this function returns 0 and the resulting command
+ * line is returned in *cmdLine.  On failure, it returns -1.
+ */
+static int assembleCmdLine(char *const *argv, char **cmdLine)
+{
+    char *const *arg;
+    int cmdLineSize;
+
+    /*
+     * Find out how large the command line buffer should be.
+     */
+    cmdLineSize = 1; /* final null */
+    for (arg = argv+1; *arg; arg++) {
+        cmdLineSize += strlen(*arg) + 1; /* space in between */
+    }
+    *cmdLine = PR_MALLOC(cmdLineSize);
+    if (*cmdLine == NULL) {
+        return -1;
+    }
+
+    (*cmdLine)[0] = '\0';
+
+    for (arg = argv+1; *arg; arg++) {
+        if (arg > argv +1) {
+            strcat(*cmdLine, " ");
+        }
+        strcat(*cmdLine, *arg);
+    } 
+    return 0;
+}
+
+/*
+ * Assemble the environment block by concatenating the envp array
+ * (preserving the terminating null byte in each array element)
+ * and adding a null byte at the end.
+ *
+ * Returns 0 on success.  The resulting environment block is returned
+ * in *envBlock.  Note that if envp is NULL, a NULL pointer is returned
+ * in *envBlock.  Returns -1 on failure.
+ */
+static int assembleEnvBlock(char **envp, char **envBlock)
+{
+    char *p;
+    char *q;
+    char **env;
+    char *curEnv;
+    char *cwdStart, *cwdEnd;
+    int envBlockSize;
+
+    PPIB ppib = NULL;
+    PTIB ptib = NULL;
+
+    if (envp == NULL) {
+        *envBlock = NULL;
+        return 0;
+    }
+
+    if(DosGetInfoBlocks(&ptib, &ppib) != NO_ERROR)
+       return -1;
+
+    curEnv = ppib->pib_pchenv;
+
+    cwdStart = curEnv;
+    while (*cwdStart) {
+        if (cwdStart[0] == '=' && cwdStart[1] != '\0'
+                && cwdStart[2] == ':' && cwdStart[3] == '=') {
+            break;
+        }
+        cwdStart += strlen(cwdStart) + 1;
+    }
+    cwdEnd = cwdStart;
+    if (*cwdEnd) {
+        cwdEnd += strlen(cwdEnd) + 1;
+        while (*cwdEnd) {
+            if (cwdEnd[0] != '=' || cwdEnd[1] == '\0'
+                    || cwdEnd[2] != ':' || cwdEnd[3] != '=') {
+                break;
+            }
+            cwdEnd += strlen(cwdEnd) + 1;
+        }
+    }
+    envBlockSize = cwdEnd - cwdStart;
+
+    for (env = envp; *env; env++) {
+        envBlockSize += strlen(*env) + 1;
+    }
+    envBlockSize++;
+
+    p = *envBlock = PR_MALLOC(envBlockSize);
+    if (p == NULL) {
+        return -1;
+    }
+
+    q = cwdStart;
+    while (q < cwdEnd) {
+        *p++ = *q++;
+    }
+
+    for (env = envp; *env; env++) {
+        q = *env;
+        while (*q) {
+            *p++ = *q++;
+        }
+        *p++ = '\0';
+    }
+    *p = '\0';
+    return 0;
+}
+
+/*
+ * For qsort.  We sort (case-insensitive) the environment strings
+ * before generating the environment block.
+ */
+static int compare(const void *arg1, const void *arg2)
+{
+    return stricmp(* (char**)arg1, * (char**)arg2);
+}
+
+PRProcess * _PR_CreateOS2Process(
+    const char *path,
+    char *const *argv,
+    char *const *envp,
+    const PRProcessAttr *attr)
+{
+    PRProcess *proc = NULL;
+    char *cmdLine = NULL;
+    char **newEnvp = NULL;
+    char *envBlock = NULL;
+   
+    STARTDATA startData = {0};
+    APIRET    rc;
+    ULONG     ulAppType = 0;
+    PID       pid = 0;
+    char     *pszComSpec;
+    char      pszEXEName[CCHMAXPATH] = "";
+    char      pszFormatString[CCHMAXPATH];
+    char      pszObjectBuffer[CCHMAXPATH];
+    char     *pszFormatResult = NULL;
+
+    /*
+     * Variables for DosExecPgm
+     */
+    char szFailed[CCHMAXPATH];
+    char *pszCmdLine = NULL;
+    RESULTCODES procInfo;
+    HFILE hStdIn  = 0,
+          hStdOut = 0,
+          hStdErr = 0;
+    HFILE hStdInSave  = -1,
+          hStdOutSave = -1,
+          hStdErrSave = -1;
+
+    proc = PR_NEW(PRProcess);
+    if (!proc) {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+        goto errorExit;
+    }
+   
+    if (assembleCmdLine(argv, &cmdLine) == -1) {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+        goto errorExit;
+    }
+
+#ifdef MOZ_OS2_HIGH_MEMORY
+    /*
+     * DosQueryAppType() fails if path (the char* in the first argument) is in
+     * high memory. If that is the case, the following moves it to low memory.
+     */ 
+    if ((ULONG)path >= 0x20000000) {
+        size_t len = strlen(path) + 1;
+        char *copy = (char *)alloca(len);
+        memcpy(copy, path, len);
+        path = copy;
+    }
+#endif
+   
+    if (envp == NULL) {
+        newEnvp = NULL;
+    } else {
+        int i;
+        int numEnv = 0;
+        while (envp[numEnv]) {
+            numEnv++;
+        }
+        newEnvp = (char **) PR_MALLOC((numEnv+1) * sizeof(char *));
+        for (i = 0; i <= numEnv; i++) {
+            newEnvp[i] = envp[i];
+        }
+        qsort((void *) newEnvp, (size_t) numEnv, sizeof(char *), compare);
+    }
+    if (assembleEnvBlock(newEnvp, &envBlock) == -1) {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+        goto errorExit;
+    }
+  
+    rc = DosQueryAppType(path, &ulAppType);
+    if (rc != NO_ERROR) {
+       char *pszDot = strrchr(path, '.');
+       if (pszDot) {
+          /* If it is a CMD file, launch the users command processor */
+          if (!stricmp(pszDot, ".cmd")) {
+             rc = DosScanEnv("COMSPEC", (PSZ *)&pszComSpec);
+             if (!rc) {
+                strcpy(pszFormatString, "/C %s %s");
+                strcpy(pszEXEName, pszComSpec);
+                ulAppType = FAPPTYP_WINDOWCOMPAT;
+             }
+          }
+       }
+    }
+    if (ulAppType == 0) {
+       PR_SetError(PR_UNKNOWN_ERROR, 0);
+       goto errorExit;
+    }
+ 
+    if ((ulAppType & FAPPTYP_WINDOWAPI) == FAPPTYP_WINDOWAPI) {
+        startData.SessionType = SSF_TYPE_PM;
+    }
+    else if (ulAppType & FAPPTYP_WINDOWCOMPAT) {
+        startData.SessionType = SSF_TYPE_WINDOWABLEVIO;
+    }
+    else {
+        startData.SessionType = SSF_TYPE_DEFAULT;
+    }
+ 
+    if (ulAppType & (FAPPTYP_WINDOWSPROT31 | FAPPTYP_WINDOWSPROT | FAPPTYP_WINDOWSREAL))
+    {
+        strcpy(pszEXEName, "WINOS2.COM");
+        startData.SessionType = PROG_31_STDSEAMLESSVDM;
+        strcpy(pszFormatString, "/3 %s %s");
+    }
+ 
+    startData.InheritOpt = SSF_INHERTOPT_SHELL;
+ 
+    if (pszEXEName[0]) {
+        pszFormatResult = PR_MALLOC(strlen(pszFormatString)+strlen(path)+strlen(cmdLine));
+        sprintf(pszFormatResult, pszFormatString, path, cmdLine);
+        startData.PgmInputs = pszFormatResult;
+    } else {
+        strcpy(pszEXEName, path);
+        startData.PgmInputs = cmdLine;
+    }
+    startData.PgmName = pszEXEName;
+ 
+    startData.Length = sizeof(startData);
+    startData.Related = SSF_RELATED_INDEPENDENT;
+    startData.ObjectBuffer = pszObjectBuffer;
+    startData.ObjectBuffLen = CCHMAXPATH;
+    startData.Environment = envBlock;
+ 
+    if (attr) {
+        /* On OS/2, there is really no way to pass file handles for stdin,
+         * stdout, and stderr to a new process.  Instead, we can make it
+         * a child process and make the given file handles a copy of our
+         * stdin, stdout, and stderr.  The child process then inherits
+         * ours, and we set ours back.  Twisted and gross I know. If you
+         * know a better way, please use it.
+         */
+        if (attr->stdinFd) {
+            hStdIn = 0;
+            DosDupHandle(hStdIn, &hStdInSave);
+            DosDupHandle((HFILE) attr->stdinFd->secret->md.osfd, &hStdIn);
+        }
+
+        if (attr->stdoutFd) {
+            hStdOut = 1;
+            DosDupHandle(hStdOut, &hStdOutSave);
+            DosDupHandle((HFILE) attr->stdoutFd->secret->md.osfd, &hStdOut);
+        }
+
+        if (attr->stderrFd) {
+            hStdErr = 2;
+            DosDupHandle(hStdErr, &hStdErrSave);
+            DosDupHandle((HFILE) attr->stderrFd->secret->md.osfd, &hStdErr);
+        }
+        /*
+         * Build up the Command Line for DosExecPgm
+         */
+        pszCmdLine = PR_MALLOC(strlen(pszEXEName) +
+                               strlen(startData.PgmInputs) + 3);
+        sprintf(pszCmdLine, "%s%c%s%c", pszEXEName, '\0',
+                startData.PgmInputs, '\0');
+        rc = DosExecPgm(szFailed,
+                        CCHMAXPATH,
+                        EXEC_ASYNCRESULT,
+                        pszCmdLine,
+                        envBlock,
+                        &procInfo,
+                        pszEXEName);
+        PR_DELETE(pszCmdLine);
+
+        /* Restore our old values.  Hope this works */
+        if (hStdInSave != -1) {
+            DosDupHandle(hStdInSave, &hStdIn);
+            DosClose(hStdInSave);
+        }
+
+        if (hStdOutSave != -1) {
+            DosDupHandle(hStdOutSave, &hStdOut);
+            DosClose(hStdOutSave);
+        }
+
+        if (hStdErrSave != -1) {
+            DosDupHandle(hStdErrSave, &hStdErr);
+            DosClose(hStdErrSave);
+        }
+
+        if (rc != NO_ERROR) {
+            /* XXX what error code? */
+            PR_SetError(PR_UNKNOWN_ERROR, rc);
+            goto errorExit;
+        }
+
+        proc->md.pid = procInfo.codeTerminate;
+    } else {	
+        /*
+         * If no STDIN/STDOUT redirection is not needed, use DosStartSession
+         * to create a new, independent session
+         */
+        rc = DosStartSession(&startData, &ulAppType, &pid);
+
+        if ((rc != NO_ERROR) && (rc != ERROR_SMG_START_IN_BACKGROUND)) {
+            PR_SetError(PR_UNKNOWN_ERROR, rc);
+            goto errorExit;
+        }
+ 
+        proc->md.pid = pid;
+    }
+
+    if (pszFormatResult) {
+        PR_DELETE(pszFormatResult);
+    }
+
+    PR_DELETE(cmdLine);
+    if (newEnvp) {
+        PR_DELETE(newEnvp);
+    }
+    if (envBlock) {
+        PR_DELETE(envBlock);
+    }
+    return proc;
+
+errorExit:
+    if (cmdLine) {
+        PR_DELETE(cmdLine);
+    }
+    if (newEnvp) {
+        PR_DELETE(newEnvp);
+    }
+    if (envBlock) {
+        PR_DELETE(envBlock);
+    }
+    if (proc) {
+        PR_DELETE(proc);
+    }
+    return NULL;
+}  /* _PR_CreateOS2Process */
+
+PRStatus _PR_DetachOS2Process(PRProcess *process)
+{
+    /* On OS/2, a process is either created as a child or not. 
+     * You can't 'detach' it later on.
+     */
+    PR_DELETE(process);
+    return PR_SUCCESS;
+}
+
+/*
+ * XXX: This will currently only work on a child process.
+ */
+PRStatus _PR_WaitOS2Process(PRProcess *process,
+    PRInt32 *exitCode)
+{
+    ULONG ulRetVal;
+    RESULTCODES results;
+    PID pidEnded = 0;
+
+    ulRetVal = DosWaitChild(DCWA_PROCESS, DCWW_WAIT, 
+                            &results,
+                            &pidEnded, process->md.pid);
+
+    if (ulRetVal != NO_ERROR) {
+       printf("\nDosWaitChild rc = %lu\n", ulRetVal);
+        PR_SetError(PR_UNKNOWN_ERROR, ulRetVal);
+        return PR_FAILURE;
+    }
+    PR_DELETE(process);
+    return PR_SUCCESS;
+}
+
+PRStatus _PR_KillOS2Process(PRProcess *process)
+{
+   ULONG ulRetVal;
+    if ((ulRetVal = DosKillProcess(DKP_PROCESS, process->md.pid)) == NO_ERROR) {
+	return PR_SUCCESS;
+    }
+    PR_SetError(PR_UNKNOWN_ERROR, ulRetVal);
+    return PR_FAILURE;
+}
+
+PRStatus _MD_OS2GetHostName(char *name, PRUint32 namelen)
+{
+    PRIntn rv;
+
+    rv = gethostname(name, (PRInt32) namelen);
+    if (0 == rv) {
+        return PR_SUCCESS;
+    }
+	_PR_MD_MAP_GETHOSTNAME_ERROR(sock_errno());
+    return PR_FAILURE;
+}
+
+void
+_PR_MD_WAKEUP_CPUS( void )
+{
+    return;
+}    
+
+/*
+ **********************************************************************
+ *
+ * Memory-mapped files
+ *
+ * A credible emulation of memory-mapped i/o on OS/2 would require
+ * an exception-handler on each thread that might access the mapped
+ * memory.  In the Mozilla environment, that would be impractical.
+ * Instead, the following simulates those modes which don't modify
+ * the mapped file.  It reads the entire mapped file segment at once
+ * when MemMap is called, and frees it on MemUnmap.  CreateFileMap
+ * only does sanity-checks, while CloseFileMap does almost nothing.
+ *
+ **********************************************************************
+ */
+
+PRStatus _MD_CreateFileMap(PRFileMap *fmap, PRInt64 size)
+{
+    PRFileInfo64 info;
+
+    /* assert on PR_PROT_READWRITE which modifies the underlying file */
+    PR_ASSERT(fmap->prot == PR_PROT_READONLY ||
+              fmap->prot == PR_PROT_WRITECOPY);
+    if (fmap->prot != PR_PROT_READONLY &&
+        fmap->prot != PR_PROT_WRITECOPY) {
+        PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+        return PR_FAILURE;
+    }
+    if (PR_GetOpenFileInfo64(fmap->fd, &info) == PR_FAILURE) {
+        return PR_FAILURE;
+    }
+    /* reject zero-byte mappings & zero-byte files */
+    if (!size || !info.size) {
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+        return PR_FAILURE;
+    }
+    /* file size rounded up to the next page boundary */
+    fmap->md.maxExtent = (info.size + 0xfff) & ~(0xfff);
+
+    return PR_SUCCESS;
+}
+
+PRInt32 _MD_GetMemMapAlignment(void)
+{
+    /* OS/2 pages are 4k */
+    return 0x1000;
+}
+
+void * _MD_MemMap(PRFileMap *fmap, PROffset64 offset, PRUint32 len)
+{
+    PRUint32 rv;
+    void *addr;
+
+    /* prevent mappings beyond EOF + remainder of page */
+    if (offset + len > fmap->md.maxExtent) {
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+        return NULL;
+    }
+    if (PR_Seek64(fmap->fd, offset, PR_SEEK_SET) == -1) {
+        return NULL;
+    }
+    /* try for high memory, fall back to low memory if hi-mem fails */
+    rv = DosAllocMem(&addr, len, OBJ_ANY | PAG_COMMIT | PAG_READ | PAG_WRITE);
+    if (rv) {
+        rv = DosAllocMem(&addr, len, PAG_COMMIT | PAG_READ | PAG_WRITE);
+        if (rv) {
+            PR_SetError(PR_OUT_OF_MEMORY_ERROR, rv);
+            return NULL;
+        }
+    }
+    if (PR_Read(fmap->fd, addr, len) == -1) {
+        DosFreeMem(addr);
+        return NULL;
+    }
+    /* don't permit writes if readonly */
+    if (fmap->prot == PR_PROT_READONLY) {
+        rv = DosSetMem(addr, len, PAG_READ);
+        if (rv) {
+            DosFreeMem(addr);
+            PR_SetError(PR_UNKNOWN_ERROR, rv);
+            return NULL;
+        }
+    }
+    return addr;
+}
+
+PRStatus _MD_MemUnmap(void *addr, PRUint32 len)
+{
+    PRUint32 rv;
+
+    /* we just have to trust that addr & len are those used by MemMap */
+    rv = DosFreeMem(addr);
+    if (rv) {
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, rv);
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}
+
+PRStatus _MD_CloseFileMap(PRFileMap *fmap)
+{
+    /* nothing to do except free the PRFileMap struct */
+    PR_Free(fmap);
+    return PR_SUCCESS;
+}
+
diff --git a/nsprpub/pr/src/md/os2/os2poll.c b/nsprpub/pr/src/md/os2/os2poll.c
new file mode 100644
index 000000000..9a0a00956
--- /dev/null
+++ b/nsprpub/pr/src/md/os2/os2poll.c
@@ -0,0 +1,348 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * This file implements _PR_MD_PR_POLL for OS/2.
+ */
+
+#include <sys/time.h> /* For timeval. */
+
+#include "primpl.h"
+
+#ifndef BSD_SELECT
+/* Utility functions called when using OS/2 select */
+
+PRBool IsSocketSet( PRInt32 osfd, int* socks, int start, int count )
+{
+  int i;
+  PRBool isSet = PR_FALSE;
+
+  for( i = start; i < start+count; i++ )
+  {
+    if( socks[i] == osfd )
+      isSet = PR_TRUE;
+  }
+  
+  return isSet; 
+}
+#endif
+
+PRInt32 _PR_MD_PR_POLL(PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
+{
+#ifdef BSD_SELECT
+    fd_set rd, wt, ex;
+#else
+    int rd, wt, ex;
+    int* socks;
+    unsigned long msecs;
+    int i, j;
+#endif
+    PRFileDesc *bottom;
+    PRPollDesc *pd, *epd;
+    PRInt32 maxfd = -1, ready, err;
+    PRIntervalTime remaining, elapsed, start;
+
+#ifdef BSD_SELECT
+    struct timeval tv, *tvp = NULL;
+
+    FD_ZERO(&rd);
+    FD_ZERO(&wt);
+    FD_ZERO(&ex);
+#else
+    rd = 0;
+    wt = 0;
+    ex = 0;
+    socks = (int) PR_MALLOC( npds * 3 * sizeof(int) );
+    
+    if (!socks)
+    {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+        return -1;
+    }
+#endif
+
+    ready = 0;
+    for (pd = pds, epd = pd + npds; pd < epd; pd++)
+    {
+        PRInt16 in_flags_read = 0, in_flags_write = 0;
+        PRInt16 out_flags_read = 0, out_flags_write = 0;
+
+        if ((NULL != pd->fd) && (0 != pd->in_flags))
+        {
+            if (pd->in_flags & PR_POLL_READ)
+            {
+                in_flags_read = (pd->fd->methods->poll)(
+                    pd->fd, pd->in_flags & ~PR_POLL_WRITE, &out_flags_read);
+            }
+            if (pd->in_flags & PR_POLL_WRITE)
+            {
+                in_flags_write = (pd->fd->methods->poll)(
+                    pd->fd, pd->in_flags & ~PR_POLL_READ, &out_flags_write);
+            }
+            if ((0 != (in_flags_read & out_flags_read)) ||
+                (0 != (in_flags_write & out_flags_write)))
+            {
+                /* this one's ready right now */
+                if (0 == ready)
+                {
+                    /*
+                     * We will have to return without calling the
+                     * system poll/select function.  So zero the
+                     * out_flags fields of all the poll descriptors
+                     * before this one.
+                     */
+                    PRPollDesc *prev;
+                    for (prev = pds; prev < pd; prev++)
+                    {
+                        prev->out_flags = 0;
+                    }
+                }
+                ready += 1;
+                pd->out_flags = out_flags_read | out_flags_write;
+            }
+            else
+            {
+                pd->out_flags = 0;  /* pre-condition */
+
+                /* make sure this is an NSPR supported stack */
+                bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+                PR_ASSERT(NULL != bottom);  /* what to do about that? */
+                if ((NULL != bottom) &&
+                    (_PR_FILEDESC_OPEN == bottom->secret->state))
+                {
+                    if (0 == ready)
+                    {
+                        PRInt32 osfd = bottom->secret->md.osfd;
+                        if (osfd > maxfd) 
+                            maxfd = osfd;
+                        if (in_flags_read & PR_POLL_READ)
+                        {
+                            pd->out_flags |= _PR_POLL_READ_SYS_READ;
+#ifdef BSD_SELECT
+                            FD_SET(osfd, &rd);
+#else
+                            socks[rd] = osfd;
+                            rd++;              
+#endif
+                        }
+                        if (in_flags_read & PR_POLL_WRITE)
+                        {
+                            pd->out_flags |= _PR_POLL_READ_SYS_WRITE;
+#ifdef BSD_SELECT
+                            FD_SET(osfd, &wt);
+#else
+                            socks[npds+wt] = osfd;
+                            wt++;              
+#endif
+                        }
+                        if (in_flags_write & PR_POLL_READ)
+                        {
+                            pd->out_flags |= _PR_POLL_WRITE_SYS_READ;
+#ifdef BSD_SELECT
+                            FD_SET(osfd, &rd);
+#else
+                            socks[rd] = osfd;
+                            rd++;              
+#endif
+                        }
+                        if (in_flags_write & PR_POLL_WRITE)
+                        {
+                            pd->out_flags |= _PR_POLL_WRITE_SYS_WRITE;
+#ifdef BSD_SELECT
+                            FD_SET(osfd, &wt);
+#else
+                            socks[npds+wt] = osfd;
+                            wt++;              
+#endif
+                        }
+                        if (pd->in_flags & PR_POLL_EXCEPT)
+                        {
+#ifdef BSD_SELECT
+                            FD_SET(osfd, &ex);
+#else
+                            socks[npds*2+ex] = osfd;
+                            ex++;
+#endif
+                        }
+                    }
+                }
+                else
+                {
+                    if (0 == ready)
+                    {
+                        PRPollDesc *prev;
+                        for (prev = pds; prev < pd; prev++)
+                        {
+                            prev->out_flags = 0;
+                        }
+                    }
+                    ready += 1;  /* this will cause an abrupt return */
+                    pd->out_flags = PR_POLL_NVAL;  /* bogii */
+                }
+            }
+        }
+        else
+        {
+            pd->out_flags = 0;
+        }
+    }
+
+    if (0 != ready)
+    {
+#ifndef BSD_SELECT
+        PR_Free(socks);
+#endif
+        return ready;  /* no need to block */
+    }
+
+    remaining = timeout;
+    start = PR_IntervalNow();
+
+retry:
+#ifdef BSD_SELECT
+    if (timeout != PR_INTERVAL_NO_TIMEOUT)
+    {
+        PRInt32 ticksPerSecond = PR_TicksPerSecond();
+        tv.tv_sec = remaining / ticksPerSecond;
+        tv.tv_usec = PR_IntervalToMicroseconds( remaining % ticksPerSecond );
+        tvp = &tv;
+    }
+
+    ready = bsdselect(maxfd + 1, &rd, &wt, &ex, tvp);
+#else
+    switch (timeout)
+    {
+        case PR_INTERVAL_NO_WAIT:
+            msecs = 0;
+            break;
+        case PR_INTERVAL_NO_TIMEOUT:
+            msecs = -1;
+            break;
+        default:
+            msecs = PR_IntervalToMilliseconds(remaining);
+    }
+
+     /* compact array */
+    for( i = rd, j = npds; j < npds+wt; i++,j++ )
+        socks[i] = socks[j];
+    for( i = rd+wt, j = npds*2; j < npds*2+ex; i++,j++ )
+        socks[i] = socks[j];
+    
+    ready = os2_select(socks, rd, wt, ex, msecs);
+#endif
+
+    if (ready == -1 && errno == EINTR)
+    {
+        if (timeout == PR_INTERVAL_NO_TIMEOUT)
+            goto retry;
+        else
+        {
+            elapsed = (PRIntervalTime) (PR_IntervalNow() - start);
+            if (elapsed > timeout)
+                ready = 0;  /* timed out */
+            else
+            {
+                remaining = timeout - elapsed;
+                goto retry;
+            }
+        }
+    }
+
+    /*
+    ** Now to unravel the select sets back into the client's poll
+    ** descriptor list. Is this possibly an area for pissing away
+    ** a few cycles or what?
+    */
+    if (ready > 0)
+    {
+        ready = 0;
+        for (pd = pds, epd = pd + npds; pd < epd; pd++)
+        {
+            PRInt16 out_flags = 0;
+            if ((NULL != pd->fd) && (0 != pd->in_flags))
+            {
+                PRInt32 osfd;
+                bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+                PR_ASSERT(NULL != bottom);
+
+                osfd = bottom->secret->md.osfd;
+
+#ifdef BSD_SELECT
+                if (FD_ISSET(osfd, &rd))
+#else
+                if( IsSocketSet(osfd, socks, 0, rd) )        
+#endif
+                {
+                    if (pd->out_flags & _PR_POLL_READ_SYS_READ)
+                        out_flags |= PR_POLL_READ;
+                    if (pd->out_flags & _PR_POLL_WRITE_SYS_READ)
+                        out_flags |= PR_POLL_WRITE;
+                } 
+
+#ifdef BSD_SELECT
+                if (FD_ISSET(osfd, &wt))
+#else
+                if( IsSocketSet(osfd, socks, rd, wt) )        
+#endif
+                {
+                    if (pd->out_flags & _PR_POLL_READ_SYS_WRITE)
+                        out_flags |= PR_POLL_READ;
+                    if (pd->out_flags & _PR_POLL_WRITE_SYS_WRITE)
+                        out_flags |= PR_POLL_WRITE;
+                } 
+
+#ifdef BSD_SELECT
+                if (FD_ISSET(osfd, &ex))
+#else
+                if( IsSocketSet(osfd, socks, rd+wt, ex) )        
+#endif
+                {
+                    out_flags |= PR_POLL_EXCEPT;
+                }
+            }
+            pd->out_flags = out_flags;
+            if (out_flags) ready++;
+        }
+        PR_ASSERT(ready > 0);
+    }
+    else if (ready < 0)
+    {
+        err = _MD_ERRNO();
+        if (err == EBADF)
+        {
+            /* Find the bad fds */
+            int optval;
+            int optlen = sizeof(optval);
+            ready = 0;
+            for (pd = pds, epd = pd + npds; pd < epd; pd++)
+            {
+                pd->out_flags = 0;
+                if ((NULL != pd->fd) && (0 != pd->in_flags))
+                {
+                    bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+                    if (getsockopt(bottom->secret->md.osfd, SOL_SOCKET,
+                        SO_TYPE, (char *) &optval, &optlen) == -1)
+                    {
+                        PR_ASSERT(sock_errno() == ENOTSOCK);
+                        if (sock_errno() == ENOTSOCK)
+                        {
+                            pd->out_flags = PR_POLL_NVAL;
+                            ready++;
+                        }
+                    }
+                }
+            }
+            PR_ASSERT(ready > 0);
+        }
+        else
+            _PR_MD_MAP_SELECT_ERROR(err);
+    }
+
+#ifndef BSD_SELECT
+    PR_Free(socks);
+#endif
+    return ready;
+}
+
diff --git a/nsprpub/pr/src/md/os2/os2rng.c b/nsprpub/pr/src/md/os2/os2rng.c
new file mode 100644
index 000000000..72f7357fa
--- /dev/null
+++ b/nsprpub/pr/src/md/os2/os2rng.c
@@ -0,0 +1,78 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+#define INCL_DOS
+#define INCL_DOSERRORS
+#include <os2.h>
+#include <stdlib.h>
+#include <time.h>
+#include "primpl.h"
+
+static BOOL clockTickTime(unsigned long *phigh, unsigned long *plow)
+{
+    APIRET rc = NO_ERROR;
+    QWORD qword = {0,0};
+
+    rc = DosTmrQueryTime(&qword);
+    if (rc != NO_ERROR)
+       return FALSE;
+
+    *phigh = qword.ulHi;
+    *plow  = qword.ulLo;
+
+    return TRUE;
+}
+
+extern PRSize _PR_MD_GetRandomNoise(void *buf, PRSize size )
+{
+    unsigned long high = 0;
+    unsigned long low  = 0;
+    clock_t val = 0;
+    int n = 0;
+    int nBytes = 0;
+    time_t sTime;
+
+    if (size <= 0)
+       return 0;
+
+    clockTickTime(&high, &low);
+
+    /* get the maximally changing bits first */
+    nBytes = sizeof(low) > size ? size : sizeof(low);
+    memcpy(buf, &low, nBytes);
+    n += nBytes;
+    size -= nBytes;
+
+    if (size <= 0)
+       return n;
+
+    nBytes = sizeof(high) > size ? size : sizeof(high);
+    memcpy(((char *)buf) + n, &high, nBytes);
+    n += nBytes;
+    size -= nBytes;
+
+    if (size <= 0)
+       return n;
+
+    /* get the number of milliseconds that have elapsed since application started */
+    val = clock();
+
+    nBytes = sizeof(val) > size ? size : sizeof(val);
+    memcpy(((char *)buf) + n, &val, nBytes);
+    n += nBytes;
+    size -= nBytes;
+
+    if (size <= 0)
+       return n;
+
+    /* get the time in seconds since midnight Jan 1, 1970 */
+    time(&sTime);
+    nBytes = sizeof(sTime) > size ? size : sizeof(sTime);
+    memcpy(((char *)buf) + n, &sTime, nBytes);
+    n += nBytes;
+
+    return n;
+}
diff --git a/nsprpub/pr/src/md/os2/os2sem.c b/nsprpub/pr/src/md/os2/os2sem.c
new file mode 100644
index 000000000..b60f35a74
--- /dev/null
+++ b/nsprpub/pr/src/md/os2/os2sem.c
@@ -0,0 +1,61 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * OS/2-specific semaphore handling code.
+ *
+ */
+
+#include "primpl.h"
+
+
+void
+_PR_MD_NEW_SEM(_MDSemaphore *md, PRUintn value)
+{
+   int rv;
+
+    /* Our Sems don't support a value > 1 */
+    PR_ASSERT(value <= 1);
+
+    rv = DosCreateEventSem(NULL, &md->sem, 0, 0);
+    PR_ASSERT(rv == NO_ERROR);
+}
+
+void
+_PR_MD_DESTROY_SEM(_MDSemaphore *md)
+{
+   int rv;
+   rv = DosCloseEventSem(md->sem);
+   PR_ASSERT(rv == NO_ERROR);
+
+}
+
+PRStatus
+_PR_MD_TIMED_WAIT_SEM(_MDSemaphore *md, PRIntervalTime ticks)
+{
+    int rv;
+    rv = DosWaitEventSem(md->sem, PR_IntervalToMilliseconds(ticks));
+
+    if (rv == NO_ERROR)
+        return PR_SUCCESS;
+    else
+        return PR_FAILURE;
+}
+
+PRStatus
+_PR_MD_WAIT_SEM(_MDSemaphore *md)
+{
+    return _PR_MD_TIMED_WAIT_SEM(md, PR_INTERVAL_NO_TIMEOUT);
+}
+
+void
+_PR_MD_POST_SEM(_MDSemaphore *md)
+{
+   int rv;
+   rv = DosPostEventSem(md->sem);
+   PR_ASSERT(rv == NO_ERROR); 
+}
+
+
diff --git a/nsprpub/pr/src/md/os2/os2sock.c b/nsprpub/pr/src/md/os2/os2sock.c
new file mode 100644
index 000000000..b32794f39
--- /dev/null
+++ b/nsprpub/pr/src/md/os2/os2sock.c
@@ -0,0 +1,654 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* OS/2 Sockets module
+ *
+ */
+
+/*Note from DSR111297 - it should be noted that there are two flavors of select() on OS/2    */
+/*There is standard BSD (which is kind of slow) and a new flavor of select() that takes      */
+/*an integer list of sockets, the number of read sockets, write sockets, except sockets, and */
+/*a millisecond count for timeout. In the interest of performance I have choosen the OS/2    */
+/*specific version of select(). See OS/2 TCP/IP Programmer's Toolkit for more info.          */ 
+
+#include "primpl.h"
+
+#include <sys/time.h> /* For timeval. */
+
+#define _PR_INTERRUPT_CHECK_INTERVAL_SECS 5
+#define READ_FD   1
+#define WRITE_FD  2
+
+/* --- SOCKET IO --------------------------------------------------------- */
+
+
+PRInt32
+_PR_MD_SOCKET(int domain, int type, int flags)
+{
+    PRInt32 osfd, err;
+
+    osfd = socket(domain, type, flags);
+
+    if (osfd == -1) 
+    {
+        err = sock_errno();
+        _PR_MD_MAP_SOCKET_ERROR(err);
+    }
+
+    return(osfd);
+}
+
+/*
+** _MD_CloseSocket() -- Close a socket
+**
+*/
+PRInt32
+_MD_CloseSocket(PRInt32 osfd)
+{
+    PRInt32 rv, err;
+
+    rv = soclose(osfd);
+    if (rv == -1) {
+        err = sock_errno();
+        _PR_MD_MAP_CLOSE_ERROR(err);
+    }
+    return rv;
+}
+
+PRInt32
+_MD_SocketAvailable(PRFileDesc *fd)
+{
+    PRInt32 result;
+
+    if (so_ioctl(fd->secret->md.osfd, FIONREAD, (char *) &result, sizeof(result)) < 0) {
+        PR_SetError(PR_BAD_DESCRIPTOR_ERROR, sock_errno());
+        return -1;
+    }
+    return result;
+}
+
+static PRInt32
+socket_io_wait( PRInt32 osfd, PRInt32 fd_type, PRIntervalTime timeout )
+{
+    PRInt32 rv = -1;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    PRIntervalTime epoch, now, elapsed, remaining;
+    PRBool wait_for_remaining;
+    PRInt32 syserror;
+#ifdef BSD_SELECT
+    struct timeval tv;
+    fd_set rd_wr;
+#else
+    int socks[1];
+    long lTimeout;
+#endif
+
+    switch (timeout) {
+        case PR_INTERVAL_NO_WAIT:
+            PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+            break;
+        case PR_INTERVAL_NO_TIMEOUT:
+            /*
+             * This is a special case of the 'default' case below.
+             * Please see the comments there.
+             */
+#ifdef BSD_SELECT
+            tv.tv_sec = _PR_INTERRUPT_CHECK_INTERVAL_SECS;
+            tv.tv_usec = 0;
+            FD_ZERO(&rd_wr);
+            do {
+                FD_SET(osfd, &rd_wr);
+                if (fd_type == READ_FD)
+                    rv = bsdselect(osfd + 1, &rd_wr, NULL, NULL, &tv);
+                else
+                    rv = bsdselect(osfd + 1, NULL, &rd_wr, NULL, &tv);
+#else
+            lTimeout = _PR_INTERRUPT_CHECK_INTERVAL_SECS * 1000; 
+            do {
+                socks[0] = osfd;
+                if (fd_type == READ_FD)
+                    rv = os2_select(socks, 1, 0, 0, lTimeout);
+                else
+                    rv = os2_select(socks, 0, 1, 0, lTimeout);
+#endif                    
+                if (rv == -1 && (syserror = sock_errno()) != EINTR) {
+                    _PR_MD_MAP_SELECT_ERROR(syserror);
+                    break;
+                }
+                if (_PR_PENDING_INTERRUPT(me)) {
+                    me->flags &= ~_PR_INTERRUPT;
+                    PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+                    rv = -1;
+                    break;
+                }
+            } while (rv == 0 || (rv == -1 && syserror == EINTR));
+            break;
+        default:
+            now = epoch = PR_IntervalNow();
+            remaining = timeout;
+#ifdef BSD_SELECT
+            FD_ZERO(&rd_wr);
+#endif
+            do {
+                /*
+                 * We block in select for at most
+                 * _PR_INTERRUPT_CHECK_INTERVAL_SECS seconds,
+                 * so that there is an upper limit on the delay
+                 * before the interrupt bit is checked.
+                 */
+#ifdef BSD_SELECT
+                wait_for_remaining = PR_TRUE;
+                tv.tv_sec = PR_IntervalToSeconds(remaining);
+                if (tv.tv_sec > _PR_INTERRUPT_CHECK_INTERVAL_SECS) {
+                    wait_for_remaining = PR_FALSE;
+                    tv.tv_sec = _PR_INTERRUPT_CHECK_INTERVAL_SECS;
+                    tv.tv_usec = 0;
+                } else {
+                    tv.tv_usec = PR_IntervalToMicroseconds(
+                        remaining -
+                        PR_SecondsToInterval(tv.tv_sec));
+                }
+                FD_SET(osfd, &rd_wr);
+                if (fd_type == READ_FD)
+                    rv = bsdselect(osfd + 1, &rd_wr, NULL, NULL, &tv);
+                else
+                    rv = bsdselect(osfd + 1, NULL, &rd_wr, NULL, &tv);
+#else
+                wait_for_remaining = PR_TRUE;
+                lTimeout = PR_IntervalToMilliseconds(remaining);
+                if (lTimeout > _PR_INTERRUPT_CHECK_INTERVAL_SECS * 1000) {
+                    wait_for_remaining = PR_FALSE;
+                    lTimeout = _PR_INTERRUPT_CHECK_INTERVAL_SECS * 1000;
+                }
+                socks[0] = osfd;
+                if (fd_type == READ_FD)
+                    rv = os2_select(socks, 1, 0, 0, lTimeout);
+                else
+                    rv = os2_select(socks, 0, 1, 0, lTimeout);
+#endif
+                /*
+                 * we don't consider EINTR a real error
+                 */
+                if (rv == -1 && (syserror = sock_errno()) != EINTR) {
+                    _PR_MD_MAP_SELECT_ERROR(syserror);
+                    break;
+                }
+                if (_PR_PENDING_INTERRUPT(me)) {
+                    me->flags &= ~_PR_INTERRUPT;
+                    PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+                    rv = -1;
+                    break;
+                }
+                /*
+                 * We loop again if select timed out or got interrupted
+                 * by a signal, and the timeout deadline has not passed yet.
+                 */
+                if (rv == 0 || (rv == -1 && syserror == EINTR)) {
+                    /*
+                     * If select timed out, we know how much time
+                     * we spent in blocking, so we can avoid a
+                     * PR_IntervalNow() call.
+                     */
+                    if (rv == 0) {
+                        if (wait_for_remaining) {
+                            now += remaining;
+                        } else {
+#ifdef BSD_SELECT
+                            now += PR_SecondsToInterval(tv.tv_sec)
+                                + PR_MicrosecondsToInterval(tv.tv_usec);
+#else
+                            now += PR_MillisecondsToInterval(lTimeout);
+#endif
+                        }
+                    } else {
+                        now = PR_IntervalNow();
+                    }
+                    elapsed = (PRIntervalTime) (now - epoch);
+                    if (elapsed >= timeout) {
+                        PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+                        rv = -1;
+                        break;
+                    } else {
+                        remaining = timeout - elapsed;
+                    }
+                }
+            } while (rv == 0 || (rv == -1 && syserror == EINTR));
+            break;
+        }
+    return(rv);
+}
+
+PRInt32
+_MD_Accept(PRFileDesc *fd, PRNetAddr *addr,
+           PRUint32 *addrlen, PRIntervalTime timeout)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    while ((rv = accept(osfd, (struct sockaddr*) addr, (int*)addrlen)) == -1)
+    {
+        err = sock_errno();
+        if ((err == EWOULDBLOCK) || (err == ECONNABORTED))
+        {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+                if ((rv = socket_io_wait(osfd, READ_FD, timeout)) < 0)
+                    goto done;
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))){
+            continue;
+        } else {
+            break;
+        }
+    }
+    if (rv < 0) {
+        _PR_MD_MAP_ACCEPT_ERROR(err);
+    }
+done:
+    return(rv);
+}
+
+PRInt32
+_PR_MD_CONNECT(PRFileDesc *fd, const PRNetAddr *addr, PRUint32 addrlen, 
+               PRIntervalTime timeout)
+{
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRNetAddr addrCopy = *addr; /* Work around a bug in OS/2 where connect
+                                 * modifies the sockaddr structure.
+                                 * See Bugzilla bug 100776. */
+
+     /*
+      * We initiate the connection setup by making a nonblocking connect()
+      * call.  If the connect() call fails, there are two cases we handle
+      * specially:
+      * 1. The connect() call was interrupted by a signal.  In this case
+      *    we simply retry connect().
+      * 2. The NSPR socket is nonblocking and connect() fails with
+      *    EINPROGRESS.  We first wait until the socket becomes writable.
+      *    Then we try to find out whether the connection setup succeeded
+      *    or failed.
+      */
+
+retry:
+    if ((rv = connect(osfd, (struct sockaddr *)&addrCopy, addrlen)) == -1)
+    {
+        err = sock_errno();
+
+        if (err == EINTR) {
+            if (_PR_PENDING_INTERRUPT(me)) {
+                me->flags &= ~_PR_INTERRUPT;
+                PR_SetError( PR_PENDING_INTERRUPT_ERROR, 0);
+                return -1;
+            }
+            goto retry;
+        }
+
+        if (!fd->secret->nonblocking && (err == EINPROGRESS))
+        {
+            /*
+             * socket_io_wait() may return -1 or 1.
+             */
+
+            rv = socket_io_wait(osfd, WRITE_FD, timeout);
+            if (rv == -1) {
+                return -1;
+            }
+
+            PR_ASSERT(rv == 1);
+            if (_PR_PENDING_INTERRUPT(me)) {
+                me->flags &= ~_PR_INTERRUPT;
+                PR_SetError( PR_PENDING_INTERRUPT_ERROR, 0);
+                return -1;
+            }
+            err = _MD_os2_get_nonblocking_connect_error(osfd);
+            if (err != 0) {
+                _PR_MD_MAP_CONNECT_ERROR(err);
+                return -1;
+            }
+            return 0;
+        }
+        
+        _PR_MD_MAP_CONNECT_ERROR(err);
+    }
+
+    return rv;
+}  /* _MD_connect */
+
+PRInt32
+_PR_MD_BIND(PRFileDesc *fd, const PRNetAddr *addr, PRUint32 addrlen)
+{
+    PRInt32 rv, err;
+    rv = bind(fd->secret->md.osfd, (struct sockaddr *) addr, (int )addrlen);
+    if (rv < 0) {
+        err = sock_errno();
+        _PR_MD_MAP_BIND_ERROR(err);
+    }
+    return(rv);
+}
+
+
+PRInt32
+_PR_MD_LISTEN(PRFileDesc *fd, PRIntn backlog)
+{
+    PRInt32 rv, err;
+    rv = listen(fd->secret->md.osfd, backlog);
+    if (rv < 0)  {
+        err = sock_errno();
+        _PR_MD_MAP_DEFAULT_ERROR(err);
+    }
+    return(rv);
+}
+
+
+PRInt32
+_PR_MD_RECV(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags, 
+            PRIntervalTime timeout)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    while ((rv = recv(osfd,buf,amount,flags)) == -1)
+    {
+        err = sock_errno();
+        if ((err == EWOULDBLOCK)) {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            if ((rv = socket_io_wait(osfd, READ_FD, timeout)) < 0)
+                goto done;
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))){
+            continue;
+        } else {
+            break;
+        }
+    }
+    if (rv < 0) {
+        _PR_MD_MAP_RECV_ERROR(err);
+    }
+done:
+    return(rv);
+}
+
+PRInt32
+_PR_MD_SEND(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+            PRIntervalTime timeout)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    while ((rv = send(osfd,buf,amount,flags)) == -1)
+    {
+        err = sock_errno();
+        if ((err == EWOULDBLOCK)) {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            if ((rv = socket_io_wait(osfd, WRITE_FD, timeout)) < 0)
+                goto done;
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))){
+            continue;
+        } else {
+            break;
+        }
+    }
+
+     /*
+      * optimization; if bytes sent is less than "amount" call
+      * select before returning. This is because it is likely that
+      * the next send() call will return EWOULDBLOCK.
+      */
+    if ((!fd->secret->nonblocking) && (rv > 0) && (rv < amount)
+        && (timeout != PR_INTERVAL_NO_WAIT))
+    {
+        if (socket_io_wait(osfd, WRITE_FD, timeout)< 0) {
+            rv = -1;
+            goto done;
+        }
+    }
+    if (rv < 0) {
+        _PR_MD_MAP_SEND_ERROR(err);
+    }
+done:
+    return(rv);
+}
+
+PRInt32
+_PR_MD_SENDTO(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+              const PRNetAddr *addr, PRUint32 addrlen, PRIntervalTime timeout)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    while ((rv = sendto(osfd, buf, amount, flags,
+           (struct sockaddr *) addr, addrlen)) == -1)
+    {
+        err = sock_errno();
+        if ((err == EWOULDBLOCK))
+        {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            if ((rv = socket_io_wait(osfd, WRITE_FD, timeout)) < 0)
+                goto done;
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))){
+            continue;
+        } else {
+            break;
+        }
+    }
+    if (rv < 0) {
+        _PR_MD_MAP_SENDTO_ERROR(err);
+    }
+done:
+    return(rv);
+}
+
+PRInt32
+_PR_MD_RECVFROM(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+                PRNetAddr *addr, PRUint32 *addrlen, PRIntervalTime timeout)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    while( (*addrlen = PR_NETADDR_SIZE(addr)),
+           ((rv = recvfrom(osfd, buf, amount, flags,
+             (struct sockaddr *) addr, (int *)addrlen)) == -1))
+    {
+        err = sock_errno();
+        if ((err == EWOULDBLOCK)) {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            if ((rv = socket_io_wait(osfd, READ_FD, timeout)) < 0)
+                goto done;
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))){
+            continue;
+        } else {
+            break;
+        }
+    }
+    if (rv < 0) {
+        _PR_MD_MAP_RECVFROM_ERROR(err);
+    }
+done:
+    return(rv);
+}
+
+PRInt32
+_PR_MD_WRITEV(PRFileDesc *fd, const PRIOVec *iov, PRInt32 iov_size,
+              PRIntervalTime timeout)
+{
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    PRInt32 index, amount = 0;
+    PRInt32 osfd = fd->secret->md.osfd;
+    struct iovec osiov[PR_MAX_IOVECTOR_SIZE];
+
+    /* Ensured by PR_Writev */
+    PR_ASSERT(iov_size <= PR_MAX_IOVECTOR_SIZE);
+
+    /*
+     * We can't pass iov to so_writev because PRIOVec and struct iovec
+     * may not be binary compatible.  Make osiov a copy of iov and
+     * pass osiov to so_writev .
+     */
+    for (index = 0; index < iov_size; index++) {
+        osiov[index].iov_base = iov[index].iov_base;
+        osiov[index].iov_len = iov[index].iov_len;
+    }
+
+     /*
+      * Calculate the total number of bytes to be sent; needed for
+      * optimization later.
+      * We could avoid this if this number was passed in; but it is
+      * probably not a big deal because iov_size is usually small (less than
+      * 3)
+      */
+    if (!fd->secret->nonblocking) {
+        for (index=0; index<iov_size; index++) {
+            amount += iov[index].iov_len;
+        }
+    }
+
+    while ((rv = so_writev(osfd, osiov, iov_size)) == -1) {
+        err = sock_errno();
+        if ((err == EWOULDBLOCK))    {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            if ((rv = socket_io_wait(osfd, WRITE_FD, timeout))<0)
+                goto done;
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))){
+            continue;
+        } else {
+            break;
+        }
+    }
+
+     /*
+      * optimization; if bytes sent is less than "amount" call
+      * select before returning. This is because it is likely that
+      * the next writev() call will return EWOULDBLOCK.
+      */
+    if ((!fd->secret->nonblocking) && (rv > 0) && (rv < amount)
+          && (timeout != PR_INTERVAL_NO_WAIT)) {
+        if (socket_io_wait(osfd, WRITE_FD, timeout) < 0) {
+            rv = -1;
+            goto done;
+        }
+    }
+    if (rv < 0) {
+        _PR_MD_MAP_WRITEV_ERROR(err);
+    }
+done:
+    return(rv);
+}
+
+PRInt32
+_PR_MD_SHUTDOWN(PRFileDesc *fd, PRIntn how)
+{
+    PRInt32 rv;
+
+    rv = shutdown(fd->secret->md.osfd, how);
+    if (rv < 0)
+        _PR_MD_MAP_SHUTDOWN_ERROR(sock_errno());
+    return rv;
+}
+
+PRInt32
+_PR_MD_SOCKETPAIR(int af, int type, int flags, PRInt32 *osfd)
+{
+    PRInt32 rv, err;
+
+    rv = socketpair(af, type, flags, osfd);
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_SOCKETPAIR_ERROR(err);
+    }
+    return rv;
+}
+
+PRStatus
+_PR_MD_GETSOCKNAME(PRFileDesc *fd, PRNetAddr *addr, PRUint32 *addrlen)
+{
+    PRInt32 rv, err;
+
+    rv = getsockname(fd->secret->md.osfd,
+                     (struct sockaddr *) addr, (int *)addrlen);
+    if (rv < 0) {
+        err = sock_errno();
+        _PR_MD_MAP_GETSOCKNAME_ERROR(err);
+    }
+    return rv==0?PR_SUCCESS:PR_FAILURE;
+}
+
+PRStatus
+_PR_MD_GETPEERNAME(PRFileDesc *fd, PRNetAddr *addr, PRUint32 *addrlen)
+{
+    PRInt32 rv, err;
+
+    rv = getpeername(fd->secret->md.osfd,
+                     (struct sockaddr *) addr, (int *)addrlen);
+    if (rv < 0) {
+        err = sock_errno();
+        _PR_MD_MAP_GETPEERNAME_ERROR(err);
+    }
+    return rv==0?PR_SUCCESS:PR_FAILURE;
+}
+
+PRStatus
+_PR_MD_GETSOCKOPT(PRFileDesc *fd, PRInt32 level, PRInt32 optname,
+                  char* optval, PRInt32* optlen)
+{
+    PRInt32 rv, err;
+
+    rv = getsockopt(fd->secret->md.osfd, level, optname, optval, (int *)optlen);
+    if (rv < 0) {
+        err = sock_errno();
+        _PR_MD_MAP_GETSOCKOPT_ERROR(err);
+    }
+    return rv==0?PR_SUCCESS:PR_FAILURE;
+}
+
+PRStatus
+_PR_MD_SETSOCKOPT(PRFileDesc *fd, PRInt32 level, PRInt32 optname,
+                  const char* optval, PRInt32 optlen)
+{
+    PRInt32 rv, err;
+
+    rv = setsockopt(fd->secret->md.osfd, level, optname, optval, optlen);
+    if (rv < 0) {
+        err = sock_errno();
+        _PR_MD_MAP_SETSOCKOPT_ERROR(err);
+    }
+    return rv==0?PR_SUCCESS:PR_FAILURE;
+}
+
+void
+_MD_MakeNonblock(PRFileDesc *fd)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRInt32 err;
+    PRUint32  one = 1;
+    
+    if (osfd <= 2) {
+        /* Don't mess around with stdin, stdout or stderr */
+        return;
+    }
+
+    err = so_ioctl( osfd, FIONBIO, (char *) &one, sizeof(one));
+    if ( err != 0 )
+    {
+        err = sock_errno();
+        _PR_MD_MAP_SOCKET_ERROR(err);
+    }
+}
diff --git a/nsprpub/pr/src/md/os2/os2thred.c b/nsprpub/pr/src/md/os2/os2thred.c
new file mode 100644
index 000000000..edb9f5f0c
--- /dev/null
+++ b/nsprpub/pr/src/md/os2/os2thred.c
@@ -0,0 +1,353 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+#include <process.h>  /* for _beginthread() */
+#include <signal.h>
+#include <float.h>
+
+/* --- globals ------------------------------------------------ */
+_NSPR_TLS*        pThreadLocalStorage = 0;
+_PRInterruptTable             _pr_interruptTable[] = { { 0 } };
+APIRET (* APIENTRY QueryThreadContext)(TID, ULONG, PCONTEXTRECORD);
+
+void
+_PR_MD_ENSURE_TLS(void)
+{
+   if(!pThreadLocalStorage)
+   {
+      /* Allocate thread local storage (TLS).  Note, that only 32 bytes can
+       * be allocated at a time. 
+       */
+      int rc = DosAllocThreadLocalMemory(sizeof(_NSPR_TLS) / 4, (PULONG*)&pThreadLocalStorage);
+      PR_ASSERT(rc == NO_ERROR);
+      memset(pThreadLocalStorage, 0, sizeof(_NSPR_TLS));
+   }
+}
+
+void
+_PR_MD_EARLY_INIT()
+{
+   HMODULE hmod;
+
+   if (DosLoadModule(NULL, 0, "DOSCALL1", &hmod) == 0)
+       DosQueryProcAddr(hmod, 877, "DOSQUERYTHREADCONTEXT",
+                        (PFN *)&QueryThreadContext);
+}
+
+static void
+_pr_SetThreadMDHandle(PRThread *thread)
+{
+   PTIB ptib;
+   PPIB ppib;
+   PRUword rc;
+
+   rc = DosGetInfoBlocks(&ptib, &ppib);
+
+   thread->md.handle = ptib->tib_ptib2->tib2_ultid;
+}
+
+/* On OS/2, some system function calls seem to change the FPU control word,
+ * such that we crash with a floating underflow exception.  The FIX_FPU() call
+ * in jsnum.c does not always work, as sometimes FIX_FPU() is called BEFORE the
+ * OS/2 system call that horks the FPU control word.  So, we set an exception
+ * handler that covers any floating point exceptions and resets the FPU CW to
+ * the required value.
+ */
+static ULONG
+_System OS2_FloatExcpHandler(PEXCEPTIONREPORTRECORD p1,
+                             PEXCEPTIONREGISTRATIONRECORD p2,
+                             PCONTEXTRECORD p3,
+                             PVOID pv)
+{
+#ifdef DEBUG_pedemonte
+    printf("Entering exception handler; ExceptionNum = %x\n", p1->ExceptionNum);
+    switch(p1->ExceptionNum) {
+        case XCPT_FLOAT_DENORMAL_OPERAND:
+            printf("got XCPT_FLOAT_DENORMAL_OPERAND\n");
+            break;
+        case XCPT_FLOAT_DIVIDE_BY_ZERO:
+            printf("got XCPT_FLOAT_DIVIDE_BY_ZERO\n");
+            break;
+        case XCPT_FLOAT_INEXACT_RESULT:
+            printf("got XCPT_FLOAT_INEXACT_RESULT\n");
+            break;
+        case XCPT_FLOAT_INVALID_OPERATION:
+            printf("got XCPT_FLOAT_INVALID_OPERATION\n");
+            break;
+        case XCPT_FLOAT_OVERFLOW:
+            printf("got XCPT_FLOAT_OVERFLOW\n");
+            break;
+        case XCPT_FLOAT_STACK_CHECK:
+            printf("got XCPT_FLOAT_STACK_CHECK\n");
+            break;
+        case XCPT_FLOAT_UNDERFLOW:
+            printf("got XCPT_FLOAT_UNDERFLOW\n");
+            break;
+    }
+#endif
+
+    switch(p1->ExceptionNum) {
+        case XCPT_FLOAT_DENORMAL_OPERAND:
+        case XCPT_FLOAT_DIVIDE_BY_ZERO:
+        case XCPT_FLOAT_INEXACT_RESULT:
+        case XCPT_FLOAT_INVALID_OPERATION:
+        case XCPT_FLOAT_OVERFLOW:
+        case XCPT_FLOAT_STACK_CHECK:
+        case XCPT_FLOAT_UNDERFLOW:
+        {
+            unsigned cw = p3->ctx_env[0];
+            if ((cw & MCW_EM) != MCW_EM) {
+                /* Mask out all floating point exceptions */
+                p3->ctx_env[0] |= MCW_EM;
+                /* Following two lines set precision to 53 bit mantissa.  See jsnum.c */
+                p3->ctx_env[0] &= ~MCW_PC;
+                p3->ctx_env[0] |= PC_53;
+                return XCPT_CONTINUE_EXECUTION;
+            }
+        }
+    }
+    return XCPT_CONTINUE_SEARCH;
+}
+
+PR_IMPLEMENT(void)
+PR_OS2_SetFloatExcpHandler(EXCEPTIONREGISTRATIONRECORD* excpreg)
+{
+    /* setup the exception handler for the thread */
+    APIRET rv;
+    excpreg->ExceptionHandler = OS2_FloatExcpHandler;
+    excpreg->prev_structure = NULL;
+    rv = DosSetExceptionHandler(excpreg);
+    PR_ASSERT(rv == NO_ERROR);
+}
+
+PR_IMPLEMENT(void)
+PR_OS2_UnsetFloatExcpHandler(EXCEPTIONREGISTRATIONRECORD* excpreg)
+{
+    /* unset exception handler */
+    APIRET rv = DosUnsetExceptionHandler(excpreg);
+    PR_ASSERT(rv == NO_ERROR);
+}
+
+PRStatus
+_PR_MD_INIT_THREAD(PRThread *thread)
+{
+   APIRET rv;
+
+   if (thread->flags & (_PR_PRIMORDIAL | _PR_ATTACHED)) {
+      _pr_SetThreadMDHandle(thread);
+   }
+
+   /* Create the blocking IO semaphore */
+   rv = DosCreateEventSem(NULL, &(thread->md.blocked_sema), 0, 0);
+   return (rv == NO_ERROR) ? PR_SUCCESS : PR_FAILURE;
+}
+
+typedef struct param_store
+{
+    void (*start)(void *);
+    PRThread* thread;
+} PARAMSTORE;
+
+/* This is a small intermediate function that sets/unsets the exception
+   handler before calling the initial thread function */
+static void
+ExcpStartFunc(void* arg)
+{
+    EXCEPTIONREGISTRATIONRECORD excpreg;
+    PARAMSTORE params, *pParams = arg;
+
+    PR_OS2_SetFloatExcpHandler(&excpreg);
+
+    params = *pParams;
+    PR_Free(pParams);
+    params.start(params.thread);
+
+    PR_OS2_UnsetFloatExcpHandler(&excpreg);
+}
+
+PRStatus
+_PR_MD_CREATE_THREAD(PRThread *thread, 
+                  void (*start)(void *), 
+                  PRThreadPriority priority, 
+                  PRThreadScope scope, 
+                  PRThreadState state, 
+                  PRUint32 stackSize)
+{
+    PARAMSTORE* params = PR_Malloc(sizeof(PARAMSTORE));
+    params->start = start;
+    params->thread = thread;
+    thread->md.handle = thread->id = (TID) _beginthread(ExcpStartFunc,
+                                                        NULL, 
+                                                        thread->stack->stackSize,
+                                                        params);
+    if(thread->md.handle == -1) {
+        return PR_FAILURE;
+    }
+
+    /*
+     * On OS/2, a thread is created with a thread priority of
+     * THREAD_PRIORITY_NORMAL
+     */
+
+    if (priority != PR_PRIORITY_NORMAL) {
+        _PR_MD_SET_PRIORITY(&(thread->md), priority);
+    }
+
+    return PR_SUCCESS;
+}
+
+void
+_PR_MD_YIELD(void)
+{
+    /* Isn't there some problem with DosSleep(0) on OS/2? */
+    DosSleep(0);
+}
+
+void
+_PR_MD_SET_PRIORITY(_MDThread *thread, PRThreadPriority newPri)
+{
+    int nativePri = PRTYC_NOCHANGE;
+    BOOL rv;
+
+    if (newPri < PR_PRIORITY_FIRST) {
+        newPri = PR_PRIORITY_FIRST;
+    } else if (newPri > PR_PRIORITY_LAST) {
+        newPri = PR_PRIORITY_LAST;
+    }
+    switch (newPri) {
+        case PR_PRIORITY_LOW:
+        case PR_PRIORITY_NORMAL:
+            nativePri = PRTYC_REGULAR;
+            break;
+        case PR_PRIORITY_HIGH:
+            nativePri = PRTYC_FOREGROUNDSERVER;
+            break;
+        case PR_PRIORITY_URGENT:
+            nativePri = PRTYC_TIMECRITICAL;
+    }
+    rv = DosSetPriority(PRTYS_THREAD, nativePri, 0, thread->handle);
+    PR_ASSERT(rv == NO_ERROR);
+    if (rv != NO_ERROR) {
+        PR_LOG(_pr_thread_lm, PR_LOG_MIN,
+                ("PR_SetThreadPriority: can't set thread priority\n"));
+    }
+    return;
+}
+
+void
+_PR_MD_CLEAN_THREAD(PRThread *thread)
+{
+    APIRET rv;
+
+    if (thread->md.blocked_sema) {
+        rv = DosCloseEventSem(thread->md.blocked_sema);
+        PR_ASSERT(rv == NO_ERROR);
+        thread->md.blocked_sema = 0;
+    }
+
+    if (thread->md.handle) {
+        thread->md.handle = 0;
+    }
+}
+
+void
+_PR_MD_EXIT_THREAD(PRThread *thread)
+{
+    _PR_MD_CLEAN_THREAD(thread);
+    _PR_MD_SET_CURRENT_THREAD(NULL);
+}
+
+
+void
+_PR_MD_EXIT(PRIntn status)
+{
+    _exit(status);
+}
+
+#ifdef HAVE_THREAD_AFFINITY
+PR_EXTERN(PRInt32) 
+_PR_MD_SETTHREADAFFINITYMASK(PRThread *thread, PRUint32 mask )
+{
+   /* Can we do this on OS/2?  Only on SMP versions? */
+   PR_NOT_REACHED("Not implemented");
+   return 0;
+
+ /* This is what windows does:
+    int rv;
+
+    rv = SetThreadAffinityMask(thread->md.handle, mask);
+
+    return rv?0:-1;
+  */
+}
+
+PR_EXTERN(PRInt32)
+_PR_MD_GETTHREADAFFINITYMASK(PRThread *thread, PRUint32 *mask)
+{
+   /* Can we do this on OS/2?  Only on SMP versions? */
+   PR_NOT_REACHED("Not implemented");
+   return 0;
+
+ /* This is what windows does:
+    PRInt32 rv, system_mask;
+
+    rv = GetProcessAffinityMask(GetCurrentProcess(), mask, &system_mask);
+    
+    return rv?0:-1;
+  */
+}
+#endif /* HAVE_THREAD_AFFINITY */
+
+void
+_PR_MD_SUSPEND_CPU(_PRCPU *cpu) 
+{
+    _PR_MD_SUSPEND_THREAD(cpu->thread);
+}
+
+void
+_PR_MD_RESUME_CPU(_PRCPU *cpu)
+{
+    _PR_MD_RESUME_THREAD(cpu->thread);
+}
+
+void
+_PR_MD_SUSPEND_THREAD(PRThread *thread)
+{
+    if (_PR_IS_NATIVE_THREAD(thread)) {
+       APIRET rc;
+
+        /* XXXMB - DosSuspendThread() is not a blocking call; how do we
+         * know when the thread is *REALLY* suspended?
+         */
+       rc = DosSuspendThread(thread->md.handle);
+       PR_ASSERT(rc == NO_ERROR);
+    }
+}
+
+void
+_PR_MD_RESUME_THREAD(PRThread *thread)
+{
+    if (_PR_IS_NATIVE_THREAD(thread)) {
+        DosResumeThread(thread->md.handle);
+    }
+}
+
+
+PRThread*
+_MD_CURRENT_THREAD(void)
+{
+    PRThread *thread;
+
+    thread = _MD_GET_ATTACHED_THREAD();
+
+    if (NULL == thread) {
+        thread = _PRI_AttachThread(PR_USER_THREAD, PR_PRIORITY_NORMAL, NULL, 0);
+    }
+
+    PR_ASSERT(thread != NULL);
+    return thread;
+}
+
diff --git a/nsprpub/pr/src/md/os2/os2vaclegacy.s b/nsprpub/pr/src/md/os2/os2vaclegacy.s
new file mode 100644
index 000000000..3dc146875
--- /dev/null
+++ b/nsprpub/pr/src/md/os2/os2vaclegacy.s
@@ -0,0 +1,45 @@
+/ -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+/ 
+/ This Source Code Form is subject to the terms of the Mozilla Public
+/ License, v. 2.0. If a copy of the MPL was not distributed with this
+/ file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+    .text
+    .align 4
+    .globl PR_NewMonitor
+PR_NewMonitor:
+    jmp _PR_NewMonitor
+
+    .align 4
+    .globl PR_EnterMonitor
+PR_EnterMonitor:
+    mov     %eax,  4(%esp) 
+    jmp _PR_EnterMonitor
+
+    .align 4
+    .globl PR_ExitMonitor 
+PR_ExitMonitor:
+    mov     %eax,  4(%esp) 
+    jmp _PR_ExitMonitor 
+
+
+    
+    .align 4
+    .globl PR_AttachThread
+PR_AttachThread:
+    mov     %eax,  4(%esp) 
+    mov     %edx,  8(%esp) 
+    mov     %ecx, 12(%esp)
+    jmp _PR_AttachThread
+    
+    .align 4
+    .globl PR_DetachThread
+PR_DetachThread:
+    jmp _PR_DetachThread
+    
+    .align 4
+    .globl PR_GetCurrentThread
+PR_GetCurrentThread:
+    jmp _PR_GetCurrentThread
+
+
diff --git a/nsprpub/pr/src/md/prosdep.c b/nsprpub/pr/src/md/prosdep.c
new file mode 100644
index 000000000..137ffaecc
--- /dev/null
+++ b/nsprpub/pr/src/md/prosdep.c
@@ -0,0 +1,76 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "prbit.h"
+#include "prsystem.h"
+
+#ifdef XP_UNIX
+#include <unistd.h>
+#endif
+#ifdef _WIN32
+#include <windows.h>
+#endif 
+#ifdef XP_BEOS
+#include <OS.h>
+#endif
+
+PRInt32 _pr_pageShift;
+PRInt32 _pr_pageSize;
+
+/*
+** Get system page size
+*/
+static void GetPageSize(void)
+{
+	PRInt32 pageSize;
+
+    /* Get page size */
+#ifdef XP_UNIX
+#if defined BSDI || defined AIX \
+        || defined LINUX || defined __GNU__ || defined __GLIBC__ \
+        || defined FREEBSD || defined NETBSD || defined OPENBSD \
+        || defined DARWIN || defined SYMBIAN
+    _pr_pageSize = getpagesize();
+#elif defined(HPUX)
+    /* I have no idea. Don't get me started. --Rob */
+    _pr_pageSize = sysconf(_SC_PAGE_SIZE);
+#else
+    _pr_pageSize = sysconf(_SC_PAGESIZE);
+#endif
+#endif /* XP_UNIX */
+
+#ifdef XP_BEOS
+    _pr_pageSize = B_PAGE_SIZE;
+#endif
+
+#ifdef XP_PC
+#ifdef _WIN32
+    SYSTEM_INFO info;
+    GetSystemInfo(&info);
+    _pr_pageSize = info.dwPageSize;
+#else
+    _pr_pageSize = 4096;
+#endif
+#endif /* XP_PC */
+
+	pageSize = _pr_pageSize;
+	PR_CEILING_LOG2(_pr_pageShift, pageSize);
+}
+
+PR_IMPLEMENT(PRInt32) PR_GetPageShift(void)
+{
+    if (!_pr_pageSize) {
+	GetPageSize();
+    }
+    return _pr_pageShift;
+}
+
+PR_IMPLEMENT(PRInt32) PR_GetPageSize(void)
+{
+    if (!_pr_pageSize) {
+	GetPageSize();
+    }
+    return _pr_pageSize;
+}
diff --git a/nsprpub/pr/src/md/unix/Makefile.in b/nsprpub/pr/src/md/unix/Makefile.in
new file mode 100644
index 000000000..f241840f8
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/Makefile.in
@@ -0,0 +1,99 @@
+# 
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+MOD_DEPTH	= ../../../..
+topsrcdir	= @top_srcdir@
+srcdir		= @srcdir@
+VPATH		= @srcdir@
+
+include $(MOD_DEPTH)/config/autoconf.mk
+
+include $(topsrcdir)/config/config.mk
+
+CSRCS =          \
+	unix.c    \
+	unix_errors.c    \
+	uxproces.c \
+	uxrng.c \
+	uxshm.c \
+	uxwrap.c \
+	$(NULL)
+
+ifneq ($(USE_PTHREADS),1)
+CSRCS += uxpoll.c
+endif
+
+ifeq ($(PTHREADS_USER),1)
+CSRCS += pthreads_user.c
+endif
+
+CSRCS += $(PR_MD_CSRCS)
+ASFILES += $(PR_MD_ASFILES)
+
+TARGETS = $(OBJS)
+
+ifeq ($(OS_ARCH),SunOS)
+	ifeq ($(CPU_ARCH),sparc)
+		ifdef USE_64
+			ULTRASPARC_ASFILES = os_SunOS_sparcv9.s
+			ULTRASPARC_ASOBJS = $(addprefix $(OBJDIR)/,$(ULTRASPARC_ASFILES:.s=.$(OBJ_SUFFIX)))
+		else
+			LIBRARY_NAME = $(ULTRASPARC_LIBRARY)
+			LIBRARY_VERSION = $(MOD_MAJOR_VERSION)
+			ULTRASPARC_ASFILES = os_SunOS_ultrasparc.s
+			ULTRASPARC_ASOBJS = $(addprefix $(OBJDIR)/,$(ULTRASPARC_ASFILES:.s=.$(OBJ_SUFFIX)))
+			TARGETS		+= $(ULTRASPARC_ASOBJS) $(SHARED_LIBRARY)
+			RELEASE_LIBS = $(SHARED_LIBRARY)
+			RELEASE_LIBS_DEST = $(RELEASE_LIB_DIR)/cpu/sparcv8plus
+			lib_subdir = cpu/sparcv8plus
+		endif
+	endif
+endif
+
+INCLUDES = -I$(dist_includedir) -I$(topsrcdir)/pr/include -I$(topsrcdir)/pr/include/private
+
+DEFINES	+= -D_NSPR_BUILD_
+
+include $(topsrcdir)/config/rules.mk
+
+export:: $(TARGETS)
+
+ifeq ($(OS_ARCH),SunOS)
+ifeq ($(CPU_ARCH),sparc)
+
+ifdef USE_64
+$(ULTRASPARC_ASOBJS): $(ULTRASPARC_ASFILES)
+	/usr/ccs/bin/as -o $@ -K PIC -P -D_ASM -D__STDC__=0 -xarch=v9 $<
+else
+$(SHARED_LIBRARY): $(ULTRASPARC_ASOBJS)
+	$(LD) -G -z text -z endfiltee -o $@ $(ULTRASPARC_ASOBJS)
+	$(INSTALL) -m 444 $@ $(dist_libdir)/cpu/sparcv8plus
+	$(INSTALL) -m 444 $@ $(dist_bindir)/cpu/sparcv8plus
+#
+# The -f $(ORIGIN)/... linker flag uses the real file, after symbolic links
+# are resolved, as the origin.  If NSDISTMODE is not "copy", libnspr4.so
+# will be installed as a symbolic link in $(dist_libdir), pointing to the
+# real libnspr4.so file in pr/src.  Therefore we need to install an
+# additional copy of libnspr_flt4.so in pr/src/cpu/sparcv8plus.
+#
+ifneq ($(NSDISTMODE),copy)
+	$(INSTALL) -m 444 $@ ../../cpu/sparcv8plus
+endif
+
+ifneq ($(NSDISTMODE),copy)
+clobber realclean clobber_all distclean::
+	rm -rf ../../cpu
+endif
+
+$(ULTRASPARC_ASOBJS): $(ULTRASPARC_ASFILES)
+	/usr/ccs/bin/as -o $@ -K PIC -P -D_ASM -D__STDC__=0 -xarch=v8plus $<
+
+clean::
+	rm -rf $(ULTRASPARC_ASOBJS)
+endif
+
+endif
+endif
diff --git a/nsprpub/pr/src/md/unix/aix.c b/nsprpub/pr/src/md/unix/aix.c
new file mode 100644
index 000000000..43f0d58de
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/aix.c
@@ -0,0 +1,301 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+#ifdef AIX_HAVE_ATOMIC_OP_H
+#include <sys/atomic_op.h>
+
+PRInt32 _AIX_AtomicSet(PRInt32 *val, PRInt32 newval)
+{
+    PRIntn oldval;
+    boolean_t stored;
+    oldval = fetch_and_add((atomic_p)val, 0);
+    do
+    {
+        stored = compare_and_swap((atomic_p)val, &oldval, newval);
+    } while (!stored);
+    return oldval;
+}  /* _AIX_AtomicSet */
+#endif /* AIX_HAVE_ATOMIC_OP_H */
+
+#if defined(AIX_TIMERS)
+
+#include <sys/time.h>
+
+static PRUint32 _aix_baseline_epoch;
+
+static void _MD_AixIntervalInit(void)
+{
+    timebasestruct_t real_time;
+    read_real_time(&real_time, TIMEBASE_SZ);
+    (void)time_base_to_time(&real_time, TIMEBASE_SZ);
+    _aix_baseline_epoch = real_time.tb_high;
+}  /* _MD_AixIntervalInit */
+
+PRIntervalTime _MD_AixGetInterval(void)
+{
+    PRIntn rv;
+    PRUint64 temp;
+    timebasestruct_t real_time;
+    read_real_time(&real_time, TIMEBASE_SZ);
+    (void)time_base_to_time(&real_time, TIMEBASE_SZ);
+    /* tb_high is in seconds, tb_low in 10(-9)seconds */
+    temp = 1000000000ULL * (PRUint64)(real_time.tb_high - _aix_baseline_epoch);
+    temp += (PRUint64)real_time.tb_low;  /* everything's 10(-9) seconds */
+    temp >>= 16;  /* now it's something way different */
+    return (PRIntervalTime)temp;
+}  /* _MD_AixGetInterval */
+
+PRIntervalTime _MD_AixIntervalPerSec(void)
+{
+    return 1000000000ULL >> 16;  /* that's 15258, I think */
+}  /* _MD_AixIntervalPerSec */
+
+#endif /* defined(AIX_TIMERS) */
+
+#if !defined(PTHREADS_USER)
+
+#if defined(_PR_PTHREADS)
+
+/*
+ * AIX 4.3 has sched_yield().  AIX 4.2 has pthread_yield().
+ * So we look up the appropriate function pointer at run time.
+ */
+
+#include <dlfcn.h>
+
+int (*_PT_aix_yield_fcn)() = NULL;
+int _pr_aix_send_file_use_disabled = 0;
+
+void _MD_EarlyInit(void)
+{
+    void *main_app_handle;
+	char *evp;
+
+    main_app_handle = dlopen(NULL, RTLD_NOW);
+    PR_ASSERT(NULL != main_app_handle);
+
+    _PT_aix_yield_fcn = (int(*)())dlsym(main_app_handle, "sched_yield");
+    if (!_PT_aix_yield_fcn) {
+        _PT_aix_yield_fcn = (int(*)())dlsym(main_app_handle,"pthread_yield");
+        PR_ASSERT(NULL != _PT_aix_yield_fcn);
+    }
+    dlclose(main_app_handle);
+
+	if (evp = getenv("NSPR_AIX_SEND_FILE_USE_DISABLED")) {
+		if (1 == atoi(evp))
+			_pr_aix_send_file_use_disabled = 1;
+	}
+
+#if defined(AIX_TIMERS)
+    _MD_AixIntervalInit();
+#endif
+}
+
+#else /* _PR_PTHREADS */
+
+void _MD_EarlyInit(void)
+{
+#if defined(AIX_TIMERS)
+    _MD_AixIntervalInit();
+#endif
+}
+
+#endif /* _PR_PTHREADS */
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+#ifndef _PR_PTHREADS
+    if (isCurrent) {
+	(void) setjmp(CONTEXT(t));
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+#else
+	*np = 0;
+	return NULL;
+#endif
+}
+
+#ifndef _PR_PTHREADS
+PR_IMPLEMENT(void)
+_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
+{
+    return;
+}
+
+PR_IMPLEMENT(PRStatus)
+_MD_InitializeThread(PRThread *thread)
+{
+	return PR_SUCCESS;
+}
+
+PR_IMPLEMENT(PRStatus)
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PR_IMPLEMENT(PRStatus)
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread) {
+	PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    }
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for AIX */
+PR_IMPLEMENT(void)
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for AIX.");
+}
+
+PR_IMPLEMENT(PRStatus)
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for AIX.");
+}
+#endif /* _PR_PTHREADS */
+#endif /* PTHREADS_USER */
+
+/*
+ * NSPR 2.0 overrides the system select() and poll() functions.
+ * On AIX 4.2, we use dlopen("/unix", RTLD_NOW) and dlsym() to get
+ * at the original system select() and poll() functions.
+ */
+
+#if !defined(AIX_RENAME_SELECT)
+
+#include <sys/select.h>
+#include <sys/poll.h>
+#include <dlfcn.h>
+
+static int (*aix_select_fcn)() = NULL;
+static int (*aix_poll_fcn)() = NULL;
+
+int _MD_SELECT(int width, fd_set *r, fd_set *w, fd_set *e, struct timeval *t)
+{
+    int rv;
+
+    if (!aix_select_fcn) {
+        void *aix_handle;
+
+	aix_handle = dlopen("/unix", RTLD_NOW);
+	if (!aix_handle) {
+	    PR_SetError(PR_UNKNOWN_ERROR, 0);
+	    return -1;
+	}
+	aix_select_fcn = (int(*)())dlsym(aix_handle,"select");
+        dlclose(aix_handle);
+	if (!aix_select_fcn) {
+	    PR_SetError(PR_UNKNOWN_ERROR, 0);
+	    return -1;
+	}
+    }
+    rv = (*aix_select_fcn)(width, r, w, e, t);
+    return rv;
+}
+
+int _MD_POLL(void *listptr, unsigned long nfds, long timeout)
+{
+    int rv;
+
+    if (!aix_poll_fcn) {
+        void *aix_handle;
+
+	aix_handle = dlopen("/unix", RTLD_NOW);
+	if (!aix_handle) {
+	    PR_SetError(PR_UNKNOWN_ERROR, 0);
+	    return -1;
+	}
+	aix_poll_fcn = (int(*)())dlsym(aix_handle,"poll");
+        dlclose(aix_handle);
+	if (!aix_poll_fcn) {
+	    PR_SetError(PR_UNKNOWN_ERROR, 0);
+	    return -1;
+	}
+    }
+    rv = (*aix_poll_fcn)(listptr, nfds, timeout);
+    return rv;
+}
+
+#else
+
+/*
+ * In AIX versions prior to 4.2, we use the two-step rename/link trick.
+ * The binary must contain at least one "poll" symbol for linker's rename
+ * to work.  So we must have this dummy function that references poll().
+ */
+#include <sys/poll.h>
+void _pr_aix_dummy()
+{
+    poll(0,0,0);
+}
+
+#endif /* !defined(AIX_RENAME_SELECT) */
+
+#ifdef _PR_HAVE_ATOMIC_CAS
+
+#include "pratom.h"
+
+#define _PR_AIX_ATOMIC_LOCK	-1
+
+PR_IMPLEMENT(void)
+PR_StackPush(PRStack *stack, PRStackElem *stack_elem)
+{
+PRStackElem *addr;
+boolean_t locked = TRUE;
+
+	/* Is it safe to cast a pointer to an int? */
+	PR_ASSERT(sizeof(int) == sizeof(PRStackElem *));
+	do {
+		while ((addr = stack->prstk_head.prstk_elem_next) ==
+											(PRStackElem *)_PR_AIX_ATOMIC_LOCK)
+			;
+		locked = _check_lock((atomic_p) &stack->prstk_head.prstk_elem_next,
+							(int) addr, _PR_AIX_ATOMIC_LOCK);
+	} while (locked == TRUE);
+	stack_elem->prstk_elem_next = addr;
+	_clear_lock((atomic_p)&stack->prstk_head.prstk_elem_next, (int)stack_elem);
+    return;
+}
+
+PR_IMPLEMENT(PRStackElem *)
+PR_StackPop(PRStack *stack)
+{
+PRStackElem *element;
+boolean_t locked = TRUE;
+
+	/* Is it safe to cast a pointer to an int? */
+	PR_ASSERT(sizeof(int) == sizeof(PRStackElem *));
+	do {
+		while ((element = stack->prstk_head.prstk_elem_next) ==
+										(PRStackElem *) _PR_AIX_ATOMIC_LOCK)
+			;
+		locked = _check_lock((atomic_p) &stack->prstk_head.prstk_elem_next,
+							(int)element, _PR_AIX_ATOMIC_LOCK);
+	} while (locked == TRUE);
+
+	if (element == NULL) {
+		_clear_lock((atomic_p) &stack->prstk_head.prstk_elem_next, NULL);
+	} else {
+		_clear_lock((atomic_p) &stack->prstk_head.prstk_elem_next,
+										(int) element->prstk_elem_next);
+	}
+	return element;
+}
+
+#endif	/* _PR_HAVE_ATOMIC_CAS */
diff --git a/nsprpub/pr/src/md/unix/aixwrap.c b/nsprpub/pr/src/md/unix/aixwrap.c
new file mode 100644
index 000000000..cb5b413f1
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/aixwrap.c
@@ -0,0 +1,33 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * File:		aixwrap.c
+ * Description:
+ *     This file contains a single function, _MD_SELECT(), which simply
+ *     invokes the select() function.  This file is used in an ugly
+ *     hack to override the system select() function on AIX releases
+ *     prior to 4.2.  (On AIX 4.2, we use a different mechanism to
+ *     override select().)
+ */
+
+#ifndef AIX_RENAME_SELECT
+#error aixwrap.c should only be used on AIX 3.2 or 4.1
+#else
+
+#include <sys/select.h>
+#include <sys/poll.h>
+
+int _MD_SELECT(int width, fd_set *r, fd_set *w, fd_set *e, struct timeval *t)
+{
+    return select(width, r, w, e, t);
+}
+
+int _MD_POLL(void *listptr, unsigned long nfds, long timeout)
+{
+    return poll(listptr, nfds, timeout);
+}
+
+#endif /* AIX_RENAME_SELECT */
diff --git a/nsprpub/pr/src/md/unix/bsdi.c b/nsprpub/pr/src/md/unix/bsdi.c
new file mode 100644
index 000000000..095547ed5
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/bsdi.c
@@ -0,0 +1,87 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+#include <signal.h>
+
+void _MD_EarlyInit(void)
+{
+    /*
+     * Ignore FPE because coercion of a NaN to an int causes SIGFPE
+     * to be raised.
+     */
+    struct sigaction act;
+
+    act.sa_handler = SIG_IGN;
+    sigemptyset(&act.sa_mask);
+    act.sa_flags = SA_RESTART;
+    sigaction(SIGFPE, &act, 0);
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+#ifndef _PR_PTHREADS
+    if (isCurrent) {
+	(void) setjmp(CONTEXT(t));
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+#else
+    *np = 0;
+    return NULL;
+#endif
+}
+
+#ifndef _PR_PTHREADS
+void
+_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
+{
+    return;
+}
+
+PRStatus
+_MD_InitializeThread(PRThread *thread)
+{
+	return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread) {
+	PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    }
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for BSDI */
+void
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for BSDI.");
+}
+
+PRStatus
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for BSDI.");
+	return PR_FAILURE;
+}
+#endif /* ! _PR_PTHREADS */
diff --git a/nsprpub/pr/src/md/unix/darwin.c b/nsprpub/pr/src/md/unix/darwin.c
new file mode 100644
index 000000000..719fc30f2
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/darwin.c
@@ -0,0 +1,113 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+#include <mach/mach_time.h>
+
+void _MD_EarlyInit(void)
+{
+}
+
+/*
+ * The multiplier (as a fraction) for converting the Mach absolute time
+ * unit to nanoseconds.
+ */
+static mach_timebase_info_data_t machTimebaseInfo;
+
+void _PR_Mach_IntervalInit(void)
+{
+    kern_return_t rv;
+
+    rv = mach_timebase_info(&machTimebaseInfo);
+    PR_ASSERT(rv == KERN_SUCCESS);
+}
+
+PRIntervalTime _PR_Mach_GetInterval(void)
+{
+    uint64_t time;
+
+    /*
+     * mach_absolute_time returns the time in the Mach absolute time unit.
+     * Convert it to milliseconds. See Mac Technical Q&A QA1398.
+     */
+    time = mach_absolute_time();
+    time = time * machTimebaseInfo.numer / machTimebaseInfo.denom /
+           PR_NSEC_PER_MSEC;
+    return (PRIntervalTime)time;
+}  /* _PR_Mach_GetInterval */
+
+PRIntervalTime _PR_Mach_TicksPerSecond(void)
+{
+    return 1000;
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+#if !defined(_PR_PTHREADS)
+    if (isCurrent) {
+	(void) setjmp(CONTEXT(t));
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+#else
+	*np = 0;
+	return NULL;
+#endif
+}
+
+#if !defined(_PR_PTHREADS)
+void
+_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
+{
+    return;
+}
+
+PRStatus
+_MD_InitializeThread(PRThread *thread)
+{
+	return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread) {
+	PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    }
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for Darwin */
+void
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for Darwin.");
+}
+
+PRStatus
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for Darwin.");
+	return PR_FAILURE;
+}
+#endif /* ! _PR_PTHREADS */
+
+/* darwin.c */
+
diff --git a/nsprpub/pr/src/md/unix/dgux.c b/nsprpub/pr/src/md/unix/dgux.c
new file mode 100644
index 000000000..a1b3602c5
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/dgux.c
@@ -0,0 +1,77 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+/*
+ * using only NSPR threads here
+ *
+ *  Copied from the UnixWare implementation.  Should be kept in sync
+ *  with ../../../include/md/_dgux.h.
+ */
+
+#include <setjmp.h>
+
+void _MD_EarlyInit(void)
+{
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+    if (isCurrent) {
+        (void) setjmp(CONTEXT(t));
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+}
+
+void
+_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
+{
+    return;
+}
+
+PRStatus
+_MD_InitializeThread(PRThread *thread)
+{
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread) {
+        PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    }
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for DG/UX */
+void
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for DG/UX.");
+}
+
+PRStatus
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for DG/UX.");
+}
+
diff --git a/nsprpub/pr/src/md/unix/freebsd.c b/nsprpub/pr/src/md/unix/freebsd.c
new file mode 100644
index 000000000..a66a81284
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/freebsd.c
@@ -0,0 +1,87 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+#include <signal.h>
+
+void _MD_EarlyInit(void)
+{
+    /*
+     * Ignore FPE because coercion of a NaN to an int causes SIGFPE
+     * to be raised.
+     */
+    struct sigaction act;
+
+    act.sa_handler = SIG_IGN;
+    sigemptyset(&act.sa_mask);
+    act.sa_flags = SA_RESTART;
+    sigaction(SIGFPE, &act, 0);
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+#ifndef _PR_PTHREADS
+    if (isCurrent) {
+	(void) sigsetjmp(CONTEXT(t), 1);
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+#else
+	*np = 0;
+	return NULL;
+#endif
+}
+
+#ifndef _PR_PTHREADS
+void
+_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
+{
+    return;
+}
+
+PRStatus
+_MD_InitializeThread(PRThread *thread)
+{
+	return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread) {
+	PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    }
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for FreeBSD */
+void
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for FreeBSD.");
+}
+
+PRStatus
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for FreeBSD.");
+	return PR_FAILURE;
+}
+#endif /* ! _PR_PTHREADS */
diff --git a/nsprpub/pr/src/md/unix/hpux.c b/nsprpub/pr/src/md/unix/hpux.c
new file mode 100644
index 000000000..56fddba29
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/hpux.c
@@ -0,0 +1,229 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+#include <setjmp.h>
+
+#if defined(HPUX_LW_TIMER)
+
+#include <machine/inline.h>
+#include <machine/clock.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/pstat.h>
+
+int __lw_get_thread_times(int which, int64_t *sample, int64_t *time);
+
+static double msecond_per_itick;
+
+void _PR_HPUX_LW_IntervalInit(void)
+{
+    struct pst_processor psp;
+    int iticksperclktick, clk_tck;
+    int rv;
+
+    rv = pstat_getprocessor(&psp, sizeof(psp), 1, 0);
+    PR_ASSERT(rv != -1);
+
+    iticksperclktick = psp.psp_iticksperclktick;
+    clk_tck = sysconf(_SC_CLK_TCK);
+    msecond_per_itick = (1000.0)/(double)(iticksperclktick * clk_tck);
+}
+
+PRIntervalTime _PR_HPUX_LW_GetInterval(void)
+{
+    int64_t time, sample;
+
+    __lw_get_thread_times(1, &sample, &time);
+    /*
+     * Division is slower than float multiplication.
+     * return (time / iticks_per_msecond);
+     */
+    return (time * msecond_per_itick);
+}
+#endif  /* HPUX_LW_TIMER */
+
+#if !defined(PTHREADS_USER)
+
+void _MD_EarlyInit(void)
+{
+#ifndef _PR_PTHREADS
+    /*
+     * The following piece of code is taken from ns/nspr/src/md_HP-UX.c.
+     * In the comment for revision 1.6, dated 1995/09/11 23:33:34,
+     * robm says:
+     *     This version has some problems which need to be addressed.
+     *     First, intercept all system calls and prevent them from
+     *     executing the library code which performs stack switches
+     *     before normal system call invocation.  In order for library
+     *     calls which make system calls to work (like stdio), however,
+     *     we must also allocate our own stack and switch the primordial
+     *     stack to use it. This isn't so bad, except that I fudged the
+     *     backtrace length when copying the old stack to the new one.
+     *
+     * This is the original comment of robm in the code:
+     *    XXXrobm Horrific. To avoid a problem with HP's system call
+     *    code, we allocate a new stack for the primordial thread and
+     *    use it. However, we don't know how far back the original stack
+     *    goes. We should create a routine that performs a backtrace and
+     *    finds out just how much we need to copy. As a temporary measure,
+     *    I just copy an arbitrary guess.
+     *
+     * In an email to servereng dated 2 Jan 1997, Mike Patnode (mikep)
+     * suggests that this only needs to be done for HP-UX 9.
+     */
+#ifdef HPUX9
+#define PIDOOMA_STACK_SIZE 524288
+#define BACKTRACE_SIZE 8192
+    {
+        jmp_buf jb;
+        char *newstack;
+        char *oldstack;
+
+        if(!setjmp(jb)) {
+            newstack = (char *) PR_MALLOC(PIDOOMA_STACK_SIZE);
+	    oldstack = (char *) (*(((int *) jb) + 1) - BACKTRACE_SIZE);
+            memcpy(newstack, oldstack, BACKTRACE_SIZE);
+            *(((int *) jb) + 1) = (int) (newstack + BACKTRACE_SIZE);
+            longjmp(jb, 1);
+        }
+    }
+#endif  /* HPUX9 */
+#endif  /* !_PR_PTHREADS */
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+#ifndef _PR_PTHREADS
+    if (isCurrent) {
+	(void) setjmp(CONTEXT(t));
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+#else
+	*np = 0;
+	return NULL;
+#endif
+}
+
+#ifndef _PR_PTHREADS
+void
+_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
+{
+    return;
+}
+
+PRStatus
+_MD_InitializeThread(PRThread *thread)
+{
+	return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread) {
+	PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    }
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for HP-UX */
+void
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for HP-UX.");
+}
+
+PRStatus
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for HP-UX.");
+}
+#endif /* _PR_PTHREADS */
+
+void
+_MD_suspend_thread(PRThread *thread)
+{
+#ifdef _PR_PTHREADS
+#endif
+}
+
+void
+_MD_resume_thread(PRThread *thread)
+{
+#ifdef _PR_PTHREADS
+#endif
+}
+#endif /* PTHREADS_USER */
+
+/*
+ * The HP version of strchr is buggy. It looks past the end of the
+ * string and causes a segmentation fault when our (NSPR) version
+ * of malloc is used.
+ *
+ * A better solution might be to put a cushion in our malloc just in
+ * case HP's version of strchr somehow gets used instead of this one.
+ */
+char *
+strchr(const char *s, int c)
+{
+    char ch;
+
+    if (!s) {
+        return NULL;
+    }
+
+    ch = (char) c;
+
+    while ((*s) && ((*s) != ch)) {
+        s++;
+    }
+
+    if ((*s) == ch) {
+        return (char *) s;
+    }
+
+    return NULL;
+}
+
+/*
+ * Implemementation of memcmp in HP-UX (verified on releases A.09.03,
+ * A.09.07, and B.10.10) dumps core if called with:
+ * 1. First operand with address = 1(mod 4).
+ * 2. Size = 1(mod 4)
+ * 3. Last byte of the second operand is the last byte of the page and 
+ *    next page is not accessible(not mapped or protected)
+ * Thus, using the following naive version (tons of optimizations are
+ * possible;^)
+ */
+
+int memcmp(const void *s1, const void *s2, size_t n)
+{
+    register unsigned char *p1 = (unsigned char *) s1,
+            *p2 = (unsigned char *) s2;
+
+    while (n-- > 0) {
+        register int r = ((int) ((unsigned int) *p1)) 
+                - ((int) ((unsigned int) *p2));
+        if (r) return r;
+        p1++; p2++;
+    }
+    return 0; 
+}
diff --git a/nsprpub/pr/src/md/unix/irix.c b/nsprpub/pr/src/md/unix/irix.c
new file mode 100644
index 000000000..c57a07b33
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/irix.c
@@ -0,0 +1,1648 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+#include <signal.h>
+
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/syssgi.h>
+#include <sys/time.h>
+#include <sys/immu.h>
+#include <sys/utsname.h>
+#include <sys/sysmp.h>
+#include <sys/pda.h>
+#include <sys/prctl.h>
+#include <sys/wait.h>
+#include <sys/resource.h>
+#include <sys/procfs.h>
+#include <task.h>
+#include <dlfcn.h>
+
+static void _MD_IrixIntervalInit(void);
+
+#if defined(_PR_PTHREADS)
+/*
+ * for compatibility with classic nspr
+ */
+void _PR_IRIX_CHILD_PROCESS()
+{
+}
+#else  /* defined(_PR_PTHREADS) */
+
+static void irix_detach_sproc(void);
+char *_nspr_sproc_private;    /* ptr. to private region in every sproc */
+
+extern PRUintn    _pr_numCPU;
+
+typedef struct nspr_arena {
+	PRCList links;
+	usptr_t *usarena;
+} nspr_arena;
+
+#define ARENA_PTR(qp) \
+	((nspr_arena *) ((char*) (qp) - offsetof(nspr_arena , links)))
+
+static usptr_t *alloc_new_arena(void);
+
+PRCList arena_list = PR_INIT_STATIC_CLIST(&arena_list);
+ulock_t arena_list_lock;
+nspr_arena first_arena;
+int	_nspr_irix_arena_cnt = 1;
+
+PRCList sproc_list = PR_INIT_STATIC_CLIST(&sproc_list);
+ulock_t sproc_list_lock;
+
+typedef struct sproc_data {
+	void (*entry) (void *, size_t);
+	unsigned inh;
+	void *arg;
+	caddr_t sp;
+	size_t len;
+	int *pid;
+	int creator_pid;
+} sproc_data;
+
+typedef struct sproc_params {
+	PRCList links;
+	sproc_data sd;
+} sproc_params;
+
+#define SPROC_PARAMS_PTR(qp) \
+	((sproc_params *) ((char*) (qp) - offsetof(sproc_params , links)))
+
+long	_nspr_irix_lock_cnt = 0;
+long	_nspr_irix_sem_cnt = 0;
+long	_nspr_irix_pollsem_cnt = 0;
+
+usptr_t *_pr_usArena;
+ulock_t _pr_heapLock;
+
+usema_t *_pr_irix_exit_sem;
+PRInt32 _pr_irix_exit_now = 0;
+PRInt32 _pr_irix_process_exit_code = 0;	/* exit code for PR_ProcessExit */
+PRInt32 _pr_irix_process_exit = 0; /* process exiting due to call to
+										   PR_ProcessExit */
+
+int _pr_irix_primoridal_cpu_fd[2] = { -1, -1 };
+static void (*libc_exit)(int) = NULL;
+static void *libc_handle = NULL;
+
+#define _NSPR_DEF_INITUSERS		100	/* default value of CONF_INITUSERS */
+#define _NSPR_DEF_INITSIZE		(4 * 1024 * 1024)	/* 4 MB */
+
+int _irix_initusers = _NSPR_DEF_INITUSERS;
+int _irix_initsize = _NSPR_DEF_INITSIZE;
+
+PRIntn _pr_io_in_progress, _pr_clock_in_progress;
+
+PRInt32 _pr_md_irix_sprocs_created, _pr_md_irix_sprocs_failed;
+PRInt32 _pr_md_irix_sprocs = 1;
+PRCList _pr_md_irix_sproc_list =
+PR_INIT_STATIC_CLIST(&_pr_md_irix_sproc_list);
+
+sigset_t ints_off;
+extern sigset_t timer_set;
+
+#if !defined(PR_SETABORTSIG)
+#define PR_SETABORTSIG 18
+#endif
+/*
+ * terminate the entire application if any sproc exits abnormally
+ */
+PRBool _nspr_terminate_on_error = PR_TRUE;
+
+/*
+ * exported interface to set the shared arena parameters
+ */
+void _PR_Irix_Set_Arena_Params(PRInt32 initusers, PRInt32 initsize)
+{
+    _irix_initusers = initusers;
+    _irix_initsize = initsize;
+}
+
+static usptr_t *alloc_new_arena()
+{
+    return(usinit("/dev/zero"));
+}
+
+static PRStatus new_poll_sem(struct _MDThread *mdthr, int val)
+{
+PRIntn _is;
+PRStatus rv = PR_SUCCESS;
+usema_t *sem = NULL;
+PRCList *qp;
+nspr_arena *arena;
+usptr_t *irix_arena;
+PRThread *me = _MD_GET_ATTACHED_THREAD();	
+
+	if (me && !_PR_IS_NATIVE_THREAD(me))
+		_PR_INTSOFF(_is); 
+	_PR_LOCK(arena_list_lock);
+	for (qp = arena_list.next; qp != &arena_list; qp = qp->next) {
+		arena = ARENA_PTR(qp);
+		sem = usnewpollsema(arena->usarena, val);
+		if (sem != NULL) {
+			mdthr->cvar_pollsem = sem;
+			mdthr->pollsem_arena = arena->usarena;
+			break;
+		}
+	}
+	if (sem == NULL) {
+		/*
+		 * If no space left in the arena allocate a new one.
+		 */
+		if (errno == ENOMEM) {
+			arena = PR_NEWZAP(nspr_arena);
+			if (arena != NULL) {
+				irix_arena = alloc_new_arena();
+				if (irix_arena) {
+					PR_APPEND_LINK(&arena->links, &arena_list);
+					_nspr_irix_arena_cnt++;
+					arena->usarena = irix_arena;
+					sem = usnewpollsema(arena->usarena, val);
+					if (sem != NULL) {
+						mdthr->cvar_pollsem = sem;
+						mdthr->pollsem_arena = arena->usarena;
+					} else
+						rv = PR_FAILURE;
+				} else {
+					PR_DELETE(arena);
+					rv = PR_FAILURE;
+				}
+
+			} else
+				rv = PR_FAILURE;
+		} else
+			rv = PR_FAILURE;
+	}
+	_PR_UNLOCK(arena_list_lock);
+	if (me && !_PR_IS_NATIVE_THREAD(me))
+		_PR_FAST_INTSON(_is);
+	if (rv == PR_SUCCESS)
+		_MD_ATOMIC_INCREMENT(&_nspr_irix_pollsem_cnt);
+	return rv;
+}
+
+static void free_poll_sem(struct _MDThread *mdthr)
+{
+PRIntn _is;
+PRThread *me = _MD_GET_ATTACHED_THREAD();	
+
+	if (me && !_PR_IS_NATIVE_THREAD(me))
+		_PR_INTSOFF(_is); 
+	usfreepollsema(mdthr->cvar_pollsem, mdthr->pollsem_arena);
+	if (me && !_PR_IS_NATIVE_THREAD(me))
+		_PR_FAST_INTSON(_is);
+	_MD_ATOMIC_DECREMENT(&_nspr_irix_pollsem_cnt);
+}
+
+static PRStatus new_lock(struct _MDLock *lockp)
+{
+PRIntn _is;
+PRStatus rv = PR_SUCCESS;
+ulock_t lock = NULL;
+PRCList *qp;
+nspr_arena *arena;
+usptr_t *irix_arena;
+PRThread *me = _MD_GET_ATTACHED_THREAD();	
+
+	if (me && !_PR_IS_NATIVE_THREAD(me))
+		_PR_INTSOFF(_is); 
+	_PR_LOCK(arena_list_lock);
+	for (qp = arena_list.next; qp != &arena_list; qp = qp->next) {
+		arena = ARENA_PTR(qp);
+		lock = usnewlock(arena->usarena);
+		if (lock != NULL) {
+			lockp->lock = lock;
+			lockp->arena = arena->usarena;
+			break;
+		}
+	}
+	if (lock == NULL) {
+		/*
+		 * If no space left in the arena allocate a new one.
+		 */
+		if (errno == ENOMEM) {
+			arena = PR_NEWZAP(nspr_arena);
+			if (arena != NULL) {
+				irix_arena = alloc_new_arena();
+				if (irix_arena) {
+					PR_APPEND_LINK(&arena->links, &arena_list);
+					_nspr_irix_arena_cnt++;
+					arena->usarena = irix_arena;
+					lock = usnewlock(irix_arena);
+					if (lock != NULL) {
+						lockp->lock = lock;
+						lockp->arena = arena->usarena;
+					} else
+						rv = PR_FAILURE;
+				} else {
+					PR_DELETE(arena);
+					rv = PR_FAILURE;
+				}
+
+			} else
+				rv = PR_FAILURE;
+		} else
+			rv = PR_FAILURE;
+	}
+	_PR_UNLOCK(arena_list_lock);
+	if (me && !_PR_IS_NATIVE_THREAD(me))
+		_PR_FAST_INTSON(_is);
+	if (rv == PR_SUCCESS)
+		_MD_ATOMIC_INCREMENT(&_nspr_irix_lock_cnt);
+	return rv;
+}
+
+static void free_lock(struct _MDLock *lockp)
+{
+PRIntn _is;
+PRThread *me = _MD_GET_ATTACHED_THREAD();	
+
+	if (me && !_PR_IS_NATIVE_THREAD(me))
+		_PR_INTSOFF(_is); 
+	usfreelock(lockp->lock, lockp->arena);
+	if (me && !_PR_IS_NATIVE_THREAD(me))
+		_PR_FAST_INTSON(_is);
+	_MD_ATOMIC_DECREMENT(&_nspr_irix_lock_cnt);
+}
+
+void _MD_FREE_LOCK(struct _MDLock *lockp)
+{
+	PRIntn _is;
+	PRThread *me = _MD_GET_ATTACHED_THREAD();	
+
+	if (me && !_PR_IS_NATIVE_THREAD(me))
+		_PR_INTSOFF(_is); 
+	free_lock(lockp);
+	if (me && !_PR_IS_NATIVE_THREAD(me))
+		_PR_FAST_INTSON(_is);
+}
+
+/*
+ * _MD_get_attached_thread
+ *		Return the thread pointer of the current thread if it is attached.
+ *
+ *		This function is needed for Irix because the thread-local-storage is
+ *		implemented by mmapin'g a page with the MAP_LOCAL flag. This causes the
+ *		sproc-private page to inherit contents of the page of the caller of sproc().
+ */
+PRThread *_MD_get_attached_thread(void)
+{
+
+	if (_MD_GET_SPROC_PID() == get_pid())
+		return _MD_THIS_THREAD();
+	else
+		return 0;
+}
+
+/*
+ * _MD_get_current_thread
+ *		Return the thread pointer of the current thread (attaching it if
+ *		necessary)
+ */
+PRThread *_MD_get_current_thread(void)
+{
+PRThread *me;
+
+	me = _MD_GET_ATTACHED_THREAD();
+    if (NULL == me) {
+        me = _PRI_AttachThread(
+            PR_USER_THREAD, PR_PRIORITY_NORMAL, NULL, 0);
+    }
+    PR_ASSERT(me != NULL);
+	return(me);
+}
+
+/*
+ * irix_detach_sproc
+ *		auto-detach a sproc when it exits
+ */
+void irix_detach_sproc(void)
+{
+PRThread *me;
+
+	me = _MD_GET_ATTACHED_THREAD();
+	if ((me != NULL) && (me->flags & _PR_ATTACHED)) {
+		_PRI_DetachThread();
+	}
+}
+
+
+PRStatus _MD_NEW_LOCK(struct _MDLock *lockp)
+{
+    PRStatus rv;
+    PRIntn is;
+    PRThread *me = _MD_GET_ATTACHED_THREAD();	
+
+	if (me && !_PR_IS_NATIVE_THREAD(me))
+		_PR_INTSOFF(is);
+	rv = new_lock(lockp);
+	if (me && !_PR_IS_NATIVE_THREAD(me))
+		_PR_FAST_INTSON(is);
+	return rv;
+}
+
+static void
+sigchld_handler(int sig)
+{
+    pid_t pid;
+    int status;
+
+    /*
+     * If an sproc exited abnormally send a SIGKILL signal to all the
+     * sprocs in the process to terminate the application
+     */
+    while ((pid = waitpid(0, &status, WNOHANG)) > 0) {
+        if (WIFSIGNALED(status) && ((WTERMSIG(status) == SIGSEGV) ||
+            (WTERMSIG(status) == SIGBUS) ||
+            (WTERMSIG(status) == SIGABRT) ||
+            (WTERMSIG(status) == SIGILL))) {
+
+				prctl(PR_SETEXITSIG, SIGKILL);
+				_exit(status);
+			}
+    }
+}
+
+static void save_context_and_block(int sig)
+{
+PRThread *me = _PR_MD_CURRENT_THREAD();
+_PRCPU *cpu = _PR_MD_CURRENT_CPU();
+
+	/*
+	 * save context
+	 */
+	(void) setjmp(me->md.jb);
+	/*
+	 * unblock the suspending thread
+	 */
+	if (me->cpu) {
+		/*
+		 * I am a cpu thread, not a user-created GLOBAL thread
+		 */
+		unblockproc(cpu->md.suspending_id);	
+	} else {
+		unblockproc(me->md.suspending_id);	
+	}
+	/*
+	 * now, block current thread
+	 */
+	blockproc(getpid());
+}
+
+/*
+** The irix kernel has a bug in it which causes async connect's which are
+** interrupted by a signal to fail terribly (EADDRINUSE is returned). 
+** We work around the bug by blocking signals during the async connect
+** attempt.
+*/
+PRInt32 _MD_irix_connect(
+    PRInt32 osfd, const PRNetAddr *addr, PRInt32 addrlen, PRIntervalTime timeout)
+{
+    PRInt32 rv;
+    sigset_t oldset;
+
+    sigprocmask(SIG_BLOCK, &ints_off, &oldset);
+    rv = connect(osfd, addr, addrlen);
+    sigprocmask(SIG_SETMASK, &oldset, 0);
+
+    return(rv);
+}
+
+#include "prprf.h"
+
+/********************************************************************/
+/********************************************************************/
+/*************** Various thread like things for IRIX ****************/
+/********************************************************************/
+/********************************************************************/
+
+void *_MD_GetSP(PRThread *t)
+{
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    void *sp;
+
+    if (me == t)
+        (void) setjmp(t->md.jb);
+
+    sp = (void *)(t->md.jb[JB_SP]);
+    PR_ASSERT((sp >= (void *) t->stack->stackBottom) &&
+        (sp <= (void *) (t->stack->stackBottom + t->stack->stackSize)));
+    return(sp);
+}
+
+void _MD_InitLocks()
+{
+    char buf[200];
+    char *init_users, *init_size;
+
+    PR_snprintf(buf, sizeof(buf), "/dev/zero");
+
+    if (init_users = getenv("_NSPR_IRIX_INITUSERS"))
+        _irix_initusers = atoi(init_users);
+
+    if (init_size = getenv("_NSPR_IRIX_INITSIZE"))
+        _irix_initsize = atoi(init_size);
+
+    usconfig(CONF_INITUSERS, _irix_initusers);
+    usconfig(CONF_INITSIZE, _irix_initsize);
+    usconfig(CONF_AUTOGROW, 1);
+    usconfig(CONF_AUTORESV, 1);
+	if (usconfig(CONF_ARENATYPE, US_SHAREDONLY) < 0) {
+		perror("PR_Init: unable to config mutex arena");
+		exit(-1);
+	}
+
+    _pr_usArena = usinit(buf);
+    if (!_pr_usArena) {
+        fprintf(stderr,
+            "PR_Init: Error - unable to create lock/monitor arena\n");
+        exit(-1);
+    }
+    _pr_heapLock = usnewlock(_pr_usArena);
+	_nspr_irix_lock_cnt++;
+
+    arena_list_lock = usnewlock(_pr_usArena);
+	_nspr_irix_lock_cnt++;
+
+    sproc_list_lock = usnewlock(_pr_usArena);
+	_nspr_irix_lock_cnt++;
+
+	_pr_irix_exit_sem = usnewsema(_pr_usArena, 0);
+	_nspr_irix_sem_cnt = 1;
+
+	first_arena.usarena = _pr_usArena;
+	PR_INIT_CLIST(&first_arena.links);
+	PR_APPEND_LINK(&first_arena.links, &arena_list);
+}
+
+/* _PR_IRIX_CHILD_PROCESS is a private API for Server group */
+void _PR_IRIX_CHILD_PROCESS()
+{
+extern PRUint32 _pr_global_threads;
+
+    PR_ASSERT(_PR_MD_CURRENT_CPU() == _pr_primordialCPU);
+    PR_ASSERT(_pr_numCPU == 1);
+    PR_ASSERT(_pr_global_threads == 0);
+    /*
+     * save the new pid
+     */
+    _pr_primordialCPU->md.id = getpid();
+	_MD_SET_SPROC_PID(getpid());	
+}
+
+static PRStatus pr_cvar_wait_sem(PRThread *thread, PRIntervalTime timeout)
+{
+    int rv;
+
+#ifdef _PR_USE_POLL
+	struct pollfd pfd;
+	int msecs;
+
+	if (timeout == PR_INTERVAL_NO_TIMEOUT)
+		msecs = -1;
+	else
+		msecs  = PR_IntervalToMilliseconds(timeout);
+#else
+    struct timeval tv, *tvp;
+    fd_set rd;
+
+	if(timeout == PR_INTERVAL_NO_TIMEOUT)
+		tvp = NULL;
+	else {
+		tv.tv_sec = PR_IntervalToSeconds(timeout);
+		tv.tv_usec = PR_IntervalToMicroseconds(
+		timeout - PR_SecondsToInterval(tv.tv_sec));
+		tvp = &tv;
+	}
+	FD_ZERO(&rd);
+	FD_SET(thread->md.cvar_pollsemfd, &rd);
+#endif
+
+    /*
+     * call uspsema only if a previous select call on this semaphore
+     * did not timeout
+     */
+    if (!thread->md.cvar_pollsem_select) {
+        rv = _PR_WAIT_SEM(thread->md.cvar_pollsem);
+		PR_ASSERT(rv >= 0);
+	} else
+        rv = 0;
+again:
+    if(!rv) {
+#ifdef _PR_USE_POLL
+		pfd.events = POLLIN;
+		pfd.fd = thread->md.cvar_pollsemfd;
+		rv = _MD_POLL(&pfd, 1, msecs);
+#else
+		rv = _MD_SELECT(thread->md.cvar_pollsemfd + 1, &rd, NULL,NULL,tvp);
+#endif
+        if ((rv == -1) && (errno == EINTR)) {
+			rv = 0;
+			goto again;
+		}
+		PR_ASSERT(rv >= 0);
+	}
+
+    if (rv > 0) {
+        /*
+         * acquired the semaphore, call uspsema next time
+         */
+        thread->md.cvar_pollsem_select = 0;
+        return PR_SUCCESS;
+    } else {
+        /*
+         * select timed out; must call select, not uspsema, when trying
+         * to acquire the semaphore the next time
+         */
+        thread->md.cvar_pollsem_select = 1;
+        return PR_FAILURE;
+    }
+}
+
+PRStatus _MD_wait(PRThread *thread, PRIntervalTime ticks)
+{
+    if ( thread->flags & _PR_GLOBAL_SCOPE ) {
+	_MD_CHECK_FOR_EXIT();
+        if (pr_cvar_wait_sem(thread, ticks) == PR_FAILURE) {
+	    _MD_CHECK_FOR_EXIT();
+            /*
+             * wait timed out
+             */
+            _PR_THREAD_LOCK(thread);
+            if (thread->wait.cvar) {
+                /*
+                 * The thread will remove itself from the waitQ
+                 * of the cvar in _PR_WaitCondVar
+                 */
+                thread->wait.cvar = NULL;
+                thread->state =  _PR_RUNNING;
+                _PR_THREAD_UNLOCK(thread);
+            }  else {
+                _PR_THREAD_UNLOCK(thread);
+                /*
+             * This thread was woken up by a notifying thread
+             * at the same time as a timeout; so, consume the
+             * extra post operation on the semaphore
+             */
+	        _MD_CHECK_FOR_EXIT();
+            pr_cvar_wait_sem(thread, PR_INTERVAL_NO_TIMEOUT);
+            }
+	    _MD_CHECK_FOR_EXIT();
+        }
+    } else {
+        _PR_MD_SWITCH_CONTEXT(thread);
+    }
+    return PR_SUCCESS;
+}
+
+PRStatus _MD_WakeupWaiter(PRThread *thread)
+{
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    PRIntn is;
+
+	PR_ASSERT(_pr_md_idle_cpus >= 0);
+    if (thread == NULL) {
+		if (_pr_md_idle_cpus)
+        	_MD_Wakeup_CPUs();
+    } else if (!_PR_IS_NATIVE_THREAD(thread)) {
+		if (_pr_md_idle_cpus)
+       		_MD_Wakeup_CPUs();
+    } else {
+		PR_ASSERT(_PR_IS_NATIVE_THREAD(thread));
+		if (!_PR_IS_NATIVE_THREAD(me))
+			_PR_INTSOFF(is);
+		_MD_CVAR_POST_SEM(thread);
+		if (!_PR_IS_NATIVE_THREAD(me))
+			_PR_FAST_INTSON(is);
+    } 
+    return PR_SUCCESS;
+}
+
+void create_sproc (void (*entry) (void *, size_t), unsigned inh,
+					void *arg, caddr_t sp, size_t len, int *pid)
+{
+sproc_params sparams;
+char data;
+int rv;
+PRThread *me = _PR_MD_CURRENT_THREAD();
+
+	if (!_PR_IS_NATIVE_THREAD(me) && (_PR_MD_CURRENT_CPU()->id == 0)) {
+		*pid = sprocsp(entry,		/* startup func		*/
+						inh,        /* attribute flags	*/
+						arg,     	/* thread param		*/
+						sp,         /* stack address	*/
+						len);       /* stack size		*/
+	} else {
+		sparams.sd.entry = entry;
+		sparams.sd.inh = inh;
+		sparams.sd.arg = arg;
+		sparams.sd.sp = sp;
+		sparams.sd.len = len;
+		sparams.sd.pid = pid;
+		sparams.sd.creator_pid = getpid();
+		_PR_LOCK(sproc_list_lock);
+		PR_APPEND_LINK(&sparams.links, &sproc_list);
+		rv = write(_pr_irix_primoridal_cpu_fd[1], &data, 1);
+		PR_ASSERT(rv == 1);
+		_PR_UNLOCK(sproc_list_lock);
+		blockproc(getpid());
+	}
+}
+
+/*
+ * _PR_MD_WAKEUP_PRIMORDIAL_CPU
+ *
+ *		wakeup cpu 0
+ */
+
+void _PR_MD_WAKEUP_PRIMORDIAL_CPU()
+{
+char data = '0';
+int rv;
+
+	rv = write(_pr_irix_primoridal_cpu_fd[1], &data, 1);
+	PR_ASSERT(rv == 1);
+}
+
+/*
+ * _PR_MD_primordial_cpu
+ *
+ *		process events that need to executed by the primordial cpu on each
+ *		iteration through the idle loop
+ */
+
+void _PR_MD_primordial_cpu()
+{
+PRCList *qp;
+sproc_params *sp;
+int pid;
+
+	_PR_LOCK(sproc_list_lock);
+	while ((qp = sproc_list.next) != &sproc_list) {
+		sp = SPROC_PARAMS_PTR(qp);
+		PR_REMOVE_LINK(&sp->links);
+		pid = sp->sd.creator_pid;
+		(*(sp->sd.pid)) = sprocsp(sp->sd.entry,		/* startup func    */
+							sp->sd.inh,            	/* attribute flags     */
+							sp->sd.arg,     		/* thread param     */
+							sp->sd.sp,             	/* stack address    */
+							sp->sd.len);         	/* stack size     */
+		unblockproc(pid);
+	}
+	_PR_UNLOCK(sproc_list_lock);
+}
+
+PRStatus _MD_CreateThread(PRThread *thread, 
+void (*start)(void *), 
+PRThreadPriority priority, 
+PRThreadScope scope, 
+PRThreadState state, 
+PRUint32 stackSize)
+{
+    typedef void (*SprocEntry) (void *, size_t);
+    SprocEntry spentry = (SprocEntry)start;
+    PRIntn is;
+	PRThread *me = _PR_MD_CURRENT_THREAD();	
+	PRInt32 pid;
+	PRStatus rv;
+
+	if (!_PR_IS_NATIVE_THREAD(me))
+		_PR_INTSOFF(is);
+    thread->md.cvar_pollsem_select = 0;
+    thread->flags |= _PR_GLOBAL_SCOPE;
+
+	thread->md.cvar_pollsemfd = -1;
+	if (new_poll_sem(&thread->md,0) == PR_FAILURE) {
+		if (!_PR_IS_NATIVE_THREAD(me))
+			_PR_FAST_INTSON(is);
+		return PR_FAILURE;
+	}
+	thread->md.cvar_pollsemfd =
+		_PR_OPEN_POLL_SEM(thread->md.cvar_pollsem);
+	if ((thread->md.cvar_pollsemfd < 0)) {
+		free_poll_sem(&thread->md);
+		if (!_PR_IS_NATIVE_THREAD(me))
+			_PR_FAST_INTSON(is);
+		return PR_FAILURE;
+	}
+
+    create_sproc(spentry,            /* startup func    */
+    			PR_SALL,            /* attribute flags     */
+    			(void *)thread,     /* thread param     */
+    			NULL,               /* stack address    */
+    			stackSize, &pid);         /* stack size     */
+    if (pid > 0) {
+        _MD_ATOMIC_INCREMENT(&_pr_md_irix_sprocs_created);
+        _MD_ATOMIC_INCREMENT(&_pr_md_irix_sprocs);
+		rv = PR_SUCCESS;
+		if (!_PR_IS_NATIVE_THREAD(me))
+			_PR_FAST_INTSON(is);
+        return rv;
+    } else {
+        close(thread->md.cvar_pollsemfd);
+        thread->md.cvar_pollsemfd = -1;
+		free_poll_sem(&thread->md);
+        thread->md.cvar_pollsem = NULL;
+        _MD_ATOMIC_INCREMENT(&_pr_md_irix_sprocs_failed);
+		if (!_PR_IS_NATIVE_THREAD(me))
+			_PR_FAST_INTSON(is);
+        return PR_FAILURE;
+    }
+}
+
+void _MD_CleanThread(PRThread *thread)
+{
+    if (thread->flags & _PR_GLOBAL_SCOPE) {
+        close(thread->md.cvar_pollsemfd);
+        thread->md.cvar_pollsemfd = -1;
+		free_poll_sem(&thread->md);
+        thread->md.cvar_pollsem = NULL;
+    }
+}
+
+void _MD_SetPriority(_MDThread *thread, PRThreadPriority newPri)
+{
+    return;
+}
+
+extern void _MD_unix_terminate_waitpid_daemon(void);
+
+void
+_MD_CleanupBeforeExit(void)
+{
+    extern PRInt32    _pr_cpus_exit;
+
+    _MD_unix_terminate_waitpid_daemon();
+
+	_pr_irix_exit_now = 1;
+    if (_pr_numCPU > 1) {
+        /*
+         * Set a global flag, and wakeup all cpus which will notice the flag
+         * and exit.
+         */
+        _pr_cpus_exit = getpid();
+        _MD_Wakeup_CPUs();
+        while(_pr_numCPU > 1) {
+            _PR_WAIT_SEM(_pr_irix_exit_sem);
+            _pr_numCPU--;
+        }
+    }
+    /*
+     * cause global threads on the recycle list to exit
+     */
+     _PR_DEADQ_LOCK;
+     if (_PR_NUM_DEADNATIVE != 0) {
+	PRThread *thread;
+    	PRCList *ptr;
+
+        ptr = _PR_DEADNATIVEQ.next;
+        while( ptr != &_PR_DEADNATIVEQ ) {
+        	thread = _PR_THREAD_PTR(ptr);
+		_MD_CVAR_POST_SEM(thread);
+                ptr = ptr->next;
+        } 
+     }
+     _PR_DEADQ_UNLOCK;
+     while(_PR_NUM_DEADNATIVE > 1) {
+	_PR_WAIT_SEM(_pr_irix_exit_sem);
+	_PR_DEC_DEADNATIVE;
+     }
+}
+
+#ifdef _PR_HAVE_SGI_PRDA_PROCMASK
+extern void __sgi_prda_procmask(int);
+#endif
+
+PRStatus
+_MD_InitAttachedThread(PRThread *thread, PRBool wakeup_parent)
+{
+	PRStatus rv = PR_SUCCESS;
+
+    if (thread->flags & _PR_GLOBAL_SCOPE) {
+		if (new_poll_sem(&thread->md,0) == PR_FAILURE) {
+			return PR_FAILURE;
+		}
+		thread->md.cvar_pollsemfd =
+			_PR_OPEN_POLL_SEM(thread->md.cvar_pollsem);
+		if ((thread->md.cvar_pollsemfd < 0)) {
+			free_poll_sem(&thread->md);
+			return PR_FAILURE;
+		}
+		if (_MD_InitThread(thread, PR_FALSE) == PR_FAILURE) {
+			close(thread->md.cvar_pollsemfd);
+			thread->md.cvar_pollsemfd = -1;
+			free_poll_sem(&thread->md);
+			thread->md.cvar_pollsem = NULL;
+			return PR_FAILURE;
+		}
+    }
+	return rv;
+}
+
+PRStatus
+_MD_InitThread(PRThread *thread, PRBool wakeup_parent)
+{
+    struct sigaction sigact;
+	PRStatus rv = PR_SUCCESS;
+
+    if (thread->flags & _PR_GLOBAL_SCOPE) {
+		thread->md.id = getpid();
+        setblockproccnt(thread->md.id, 0);
+		_MD_SET_SPROC_PID(getpid());	
+#ifdef _PR_HAVE_SGI_PRDA_PROCMASK
+		/*
+		 * enable user-level processing of sigprocmask(); this is an
+		 * undocumented feature available in Irix 6.2, 6.3, 6.4 and 6.5
+		 */
+		__sgi_prda_procmask(USER_LEVEL);
+#endif
+		/*
+		 * set up SIGUSR1 handler; this is used to save state
+		 */
+		sigact.sa_handler = save_context_and_block;
+		sigact.sa_flags = SA_RESTART;
+		/*
+		 * Must mask clock interrupts
+		 */
+		sigact.sa_mask = timer_set;
+		sigaction(SIGUSR1, &sigact, 0);
+
+
+		/*
+		 * PR_SETABORTSIG is a new command implemented in a patch to
+		 * Irix 6.2, 6.3 and 6.4. This causes a signal to be sent to all
+		 * sprocs in the process when one of them terminates abnormally
+		 *
+		 */
+		if (prctl(PR_SETABORTSIG, SIGKILL) < 0) {
+			/*
+			 *  if (errno == EINVAL)
+			 *
+			 *	PR_SETABORTSIG not supported under this OS.
+			 *	You may want to get a recent kernel rollup patch that
+			 *	supports this feature.
+			 */
+		}
+		/*
+		 * SIGCLD handler for detecting abormally-terminating
+		 * sprocs and for reaping sprocs
+		 */
+		sigact.sa_handler = sigchld_handler;
+		sigact.sa_flags = SA_RESTART;
+		sigact.sa_mask = ints_off;
+		sigaction(SIGCLD, &sigact, NULL);
+    }
+	return rv;
+}
+
+/*
+ * PR_Cleanup should be executed on the primordial sproc; migrate the thread
+ * to the primordial cpu
+ */
+
+void _PR_MD_PRE_CLEANUP(PRThread *me)
+{
+PRIntn is;
+_PRCPU *cpu = _pr_primordialCPU;
+
+	PR_ASSERT(cpu);
+
+	me->flags |= _PR_BOUND_THREAD;	
+
+	if (me->cpu->id != 0) {
+		_PR_INTSOFF(is);
+		_PR_RUNQ_LOCK(cpu);
+		me->cpu = cpu;
+		me->state = _PR_RUNNABLE;
+		_PR_ADD_RUNQ(me, cpu, me->priority);
+		_PR_RUNQ_UNLOCK(cpu);
+		_MD_Wakeup_CPUs();
+
+		_PR_MD_SWITCH_CONTEXT(me);
+
+		_PR_FAST_INTSON(is);
+		PR_ASSERT(me->cpu->id == 0);
+	}
+}
+
+/*
+ * process exiting
+ */
+PR_EXTERN(void ) _MD_exit(PRIntn status)
+{
+PRThread *me = _PR_MD_CURRENT_THREAD();
+
+	/*
+	 * the exit code of the process is the exit code of the primordial
+	 * sproc
+	 */
+	if (!_PR_IS_NATIVE_THREAD(me) && (_PR_MD_CURRENT_CPU()->id == 0)) {
+		/*
+		 * primordial sproc case: call _exit directly
+		 * Cause SIGKILL to be sent to other sprocs
+		 */
+		prctl(PR_SETEXITSIG, SIGKILL);
+		_exit(status);
+	} else {
+		int rv;
+		char data;
+		sigset_t set;
+
+		/*
+		 * non-primordial sproc case: cause the primordial sproc, cpu 0,
+		 * to wakeup and call _exit
+		 */
+		_pr_irix_process_exit = 1;
+		_pr_irix_process_exit_code = status;
+		rv = write(_pr_irix_primoridal_cpu_fd[1], &data, 1);
+		PR_ASSERT(rv == 1);
+		/*
+		 * block all signals and wait for SIGKILL to terminate this sproc
+		 */
+		sigfillset(&set);
+		sigsuspend(&set);
+		/*
+		 * this code doesn't (shouldn't) execute
+		 */
+		prctl(PR_SETEXITSIG, SIGKILL);
+		_exit(status);
+	}
+}
+
+/*
+ * Override the exit() function in libc to cause the process to exit
+ * when the primodial/main nspr thread calls exit. Calls to exit by any
+ * other thread simply result in a call to the exit function in libc.
+ * The exit code of the process is the exit code of the primordial
+ * sproc.
+ */
+
+void exit(int status)
+{
+PRThread *me, *thr;
+PRCList *qp;
+
+	if (!_pr_initialized)  {
+		if (!libc_exit) {
+
+			if (!libc_handle)
+				libc_handle = dlopen("libc.so",RTLD_NOW);
+			if (libc_handle)
+				libc_exit = (void (*)(int)) dlsym(libc_handle, "exit");
+		}
+		if (libc_exit)
+			(*libc_exit)(status);
+		else
+			_exit(status);
+	}
+
+	me = _PR_MD_CURRENT_THREAD();
+
+	if (me == NULL) 		/* detached thread */
+		(*libc_exit)(status);
+
+	PR_ASSERT(_PR_IS_NATIVE_THREAD(me) ||
+						(_PR_MD_CURRENT_CPU())->id == me->cpu->id);
+
+	if (me->flags & _PR_PRIMORDIAL) {
+
+		me->flags |= _PR_BOUND_THREAD;	
+
+		PR_ASSERT((_PR_MD_CURRENT_CPU())->id == me->cpu->id);
+		if (me->cpu->id != 0) {
+			_PRCPU *cpu = _pr_primordialCPU;
+			PRIntn is;
+
+			_PR_INTSOFF(is);
+			_PR_RUNQ_LOCK(cpu);
+			me->cpu = cpu;
+			me->state = _PR_RUNNABLE;
+			_PR_ADD_RUNQ(me, cpu, me->priority);
+			_PR_RUNQ_UNLOCK(cpu);
+			_MD_Wakeup_CPUs();
+
+			_PR_MD_SWITCH_CONTEXT(me);
+
+			_PR_FAST_INTSON(is);
+		}
+
+		PR_ASSERT((_PR_MD_CURRENT_CPU())->id == 0);
+
+		if (prctl(PR_GETNSHARE) > 1) {
+#define SPROC_EXIT_WAIT_TIME 5
+			int sleep_cnt = SPROC_EXIT_WAIT_TIME;
+
+			/*
+			 * sprocs still running; caue cpus and recycled global threads
+			 * to exit
+			 */
+			_pr_irix_exit_now = 1;
+			if (_pr_numCPU > 1) {
+				_MD_Wakeup_CPUs();
+			}
+			 _PR_DEADQ_LOCK;
+			 if (_PR_NUM_DEADNATIVE != 0) {
+				PRThread *thread;
+				PRCList *ptr;
+
+				ptr = _PR_DEADNATIVEQ.next;
+				while( ptr != &_PR_DEADNATIVEQ ) {
+					thread = _PR_THREAD_PTR(ptr);
+					_MD_CVAR_POST_SEM(thread);
+					ptr = ptr->next;
+				} 
+			 }
+
+			while (sleep_cnt-- > 0) {
+				if (waitpid(0, NULL, WNOHANG) >= 0) 
+					sleep(1);
+				else
+					break;
+			}
+			prctl(PR_SETEXITSIG, SIGKILL);
+		}
+		(*libc_exit)(status);
+	} else {
+		/*
+		 * non-primordial thread; simply call exit in libc.
+		 */
+		(*libc_exit)(status);
+	}
+}
+
+
+void
+_MD_InitRunningCPU(_PRCPU *cpu)
+{
+    extern int _pr_md_pipefd[2];
+
+    _MD_unix_init_running_cpu(cpu);
+    cpu->md.id = getpid();
+	_MD_SET_SPROC_PID(getpid());	
+	if (_pr_md_pipefd[0] >= 0) {
+    	_PR_IOQ_MAX_OSFD(cpu) = _pr_md_pipefd[0];
+#ifndef _PR_USE_POLL
+    	FD_SET(_pr_md_pipefd[0], &_PR_FD_READ_SET(cpu));
+#endif
+	}
+}
+
+void
+_MD_ExitThread(PRThread *thread)
+{
+    if (thread->flags & _PR_GLOBAL_SCOPE) {
+        _MD_ATOMIC_DECREMENT(&_pr_md_irix_sprocs);
+        _MD_CLEAN_THREAD(thread);
+        _MD_SET_CURRENT_THREAD(NULL);
+    }
+}
+
+void
+_MD_SuspendCPU(_PRCPU *cpu)
+{
+    PRInt32 rv;
+
+	cpu->md.suspending_id = getpid();
+	rv = kill(cpu->md.id, SIGUSR1);
+	PR_ASSERT(rv == 0);
+	/*
+	 * now, block the current thread/cpu until woken up by the suspended
+	 * thread from it's SIGUSR1 signal handler
+	 */
+	blockproc(getpid());
+
+}
+
+void
+_MD_ResumeCPU(_PRCPU *cpu)
+{
+    unblockproc(cpu->md.id);
+}
+
+#if 0
+/*
+ * save the register context of a suspended sproc
+ */
+void get_context(PRThread *thr)
+{
+    int len, fd;
+    char pidstr[24];
+    char path[24];
+
+    /*
+     * open the file corresponding to this process in procfs
+     */
+    sprintf(path,"/proc/%s","00000");
+    len = strlen(path);
+    sprintf(pidstr,"%d",thr->md.id);
+    len -= strlen(pidstr);
+    sprintf(path + len,"%s",pidstr);
+    fd = open(path,O_RDONLY);
+    if (fd >= 0) {
+        (void) ioctl(fd, PIOCGREG, thr->md.gregs);
+        close(fd);
+    }
+    return;
+}
+#endif	/* 0 */
+
+void
+_MD_SuspendThread(PRThread *thread)
+{
+    PRInt32 rv;
+
+    PR_ASSERT((thread->flags & _PR_GLOBAL_SCOPE) &&
+        _PR_IS_GCABLE_THREAD(thread));
+
+	thread->md.suspending_id = getpid();
+	rv = kill(thread->md.id, SIGUSR1);
+	PR_ASSERT(rv == 0);
+	/*
+	 * now, block the current thread/cpu until woken up by the suspended
+	 * thread from it's SIGUSR1 signal handler
+	 */
+	blockproc(getpid());
+}
+
+void
+_MD_ResumeThread(PRThread *thread)
+{
+    PR_ASSERT((thread->flags & _PR_GLOBAL_SCOPE) &&
+        _PR_IS_GCABLE_THREAD(thread));
+    (void)unblockproc(thread->md.id);
+}
+
+/*
+ * return the set of processors available for scheduling procs in the
+ * "mask" argument
+ */
+PRInt32 _MD_GetThreadAffinityMask(PRThread *unused, PRUint32 *mask)
+{
+    PRInt32 nprocs, rv;
+    struct pda_stat *pstat;
+#define MAX_PROCESSORS    32
+
+    nprocs = sysmp(MP_NPROCS);
+    if (nprocs < 0)
+        return(-1);
+    pstat = (struct pda_stat*)PR_MALLOC(sizeof(struct pda_stat) * nprocs);
+    if (pstat == NULL)
+        return(-1);
+    rv = sysmp(MP_STAT, pstat);
+    if (rv < 0) {
+        PR_DELETE(pstat);
+        return(-1);
+    }
+    /*
+     * look at the first 32 cpus
+     */
+    nprocs = (nprocs > MAX_PROCESSORS) ? MAX_PROCESSORS : nprocs;
+    *mask = 0;
+    while (nprocs) {
+        if ((pstat->p_flags & PDAF_ENABLED) &&
+            !(pstat->p_flags & PDAF_ISOLATED)) {
+            *mask |= (1 << pstat->p_cpuid);
+        }
+        nprocs--;
+        pstat++;
+    }
+    return 0;
+}
+
+static char *_thr_state[] = {
+    "UNBORN",
+    "RUNNABLE",
+    "RUNNING",
+    "LOCK_WAIT",
+    "COND_WAIT",
+    "JOIN_WAIT",
+    "IO_WAIT",
+    "SUSPENDED",
+    "DEAD"
+};
+
+void _PR_List_Threads()
+{
+    PRThread *thr;
+    void *handle;
+    struct _PRCPU *cpu;
+    PRCList *qp;
+    int len, fd;
+    char pidstr[24];
+    char path[24];
+    prpsinfo_t pinfo;
+
+
+    printf("\n%s %-s\n"," ","LOCAL Threads");
+    printf("%s %-s\n"," ","----- -------");
+    printf("%s %-14s %-10s %-12s %-3s %-10s %-10s %-12s\n\n"," ",
+        "Thread", "State", "Wait-Handle",
+        "Cpu","Stk-Base","Stk-Sz","SP");
+    for (qp = _PR_ACTIVE_LOCAL_THREADQ().next;
+        qp != &_PR_ACTIVE_LOCAL_THREADQ(); qp = qp->next) {
+        thr = _PR_ACTIVE_THREAD_PTR(qp);
+        printf("%s 0x%-12x %-10s "," ",thr,_thr_state[thr->state]);
+        if (thr->state == _PR_LOCK_WAIT)
+            handle = thr->wait.lock;
+        else if (thr->state == _PR_COND_WAIT)
+            handle = thr->wait.cvar;
+        else
+            handle = NULL;
+        if (handle)
+            printf("0x%-10x ",handle);
+        else
+            printf("%-12s "," ");
+        printf("%-3d ",thr->cpu->id);
+        printf("0x%-8x ",thr->stack->stackBottom);
+        printf("0x%-8x ",thr->stack->stackSize);
+        printf("0x%-10x\n",thr->md.jb[JB_SP]);
+    }
+
+    printf("\n%s %-s\n"," ","GLOBAL Threads");
+    printf("%s %-s\n"," ","------ -------");
+    printf("%s %-14s %-6s %-12s %-12s %-12s %-12s\n\n"," ","Thread",
+        "Pid","State","Wait-Handle",
+        "Stk-Base","Stk-Sz");
+
+    for (qp = _PR_ACTIVE_GLOBAL_THREADQ().next;
+        qp != &_PR_ACTIVE_GLOBAL_THREADQ(); qp = qp->next) {
+        thr = _PR_ACTIVE_THREAD_PTR(qp);
+        if (thr->cpu != NULL)
+            continue;        /* it is a cpu thread */
+        printf("%s 0x%-12x %-6d "," ",thr,thr->md.id);
+        /*
+         * check if the sproc is still running
+         * first call prctl(PR_GETSHMASK,pid) to check if
+         * the process is part of the share group (the pid
+         * could have been recycled by the OS)
+         */
+        if (prctl(PR_GETSHMASK,thr->md.id) < 0) {
+            printf("%-12s\n","TERMINATED");
+            continue;
+        }
+        /*
+         * Now, check if the sproc terminated and is in zombie
+         * state
+         */
+        sprintf(path,"/proc/pinfo/%s","00000");
+        len = strlen(path);
+        sprintf(pidstr,"%d",thr->md.id);
+        len -= strlen(pidstr);
+        sprintf(path + len,"%s",pidstr);
+        fd = open(path,O_RDONLY);
+        if (fd >= 0) {
+            if (ioctl(fd, PIOCPSINFO, &pinfo) < 0)
+                printf("%-12s ","TERMINATED");
+            else if (pinfo.pr_zomb)
+                printf("%-12s ","TERMINATED");
+            else
+                printf("%-12s ",_thr_state[thr->state]);
+            close(fd);
+        } else {
+            printf("%-12s ","TERMINATED");
+        }
+
+        if (thr->state == _PR_LOCK_WAIT)
+            handle = thr->wait.lock;
+        else if (thr->state == _PR_COND_WAIT)
+            handle = thr->wait.cvar;
+        else
+            handle = NULL;
+        if (handle)
+            printf("%-12x ",handle);
+        else
+            printf("%-12s "," ");
+        printf("0x%-10x ",thr->stack->stackBottom);
+        printf("0x%-10x\n",thr->stack->stackSize);
+    }
+
+    printf("\n%s %-s\n"," ","CPUs");
+    printf("%s %-s\n"," ","----");
+    printf("%s %-14s %-6s %-12s \n\n"," ","Id","Pid","State");
+
+
+    for (qp = _PR_CPUQ().next; qp != &_PR_CPUQ(); qp = qp->next) {
+        cpu = _PR_CPU_PTR(qp);
+        printf("%s %-14d %-6d "," ",cpu->id,cpu->md.id);
+        /*
+         * check if the sproc is still running
+         * first call prctl(PR_GETSHMASK,pid) to check if
+         * the process is part of the share group (the pid
+         * could have been recycled by the OS)
+         */
+        if (prctl(PR_GETSHMASK,cpu->md.id) < 0) {
+            printf("%-12s\n","TERMINATED");
+            continue;
+        }
+        /*
+         * Now, check if the sproc terminated and is in zombie
+         * state
+         */
+        sprintf(path,"/proc/pinfo/%s","00000");
+        len = strlen(path);
+        sprintf(pidstr,"%d",cpu->md.id);
+        len -= strlen(pidstr);
+        sprintf(path + len,"%s",pidstr);
+        fd = open(path,O_RDONLY);
+        if (fd >= 0) {
+            if (ioctl(fd, PIOCPSINFO, &pinfo) < 0)
+                printf("%-12s\n","TERMINATED");
+            else if (pinfo.pr_zomb)
+                printf("%-12s\n","TERMINATED");
+            else
+                printf("%-12s\n","RUNNING");
+            close(fd);
+        } else {
+            printf("%-12s\n","TERMINATED");
+        }
+
+    }
+    fflush(stdout);
+}
+#endif /* defined(_PR_PTHREADS) */ 
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+#if !defined(_PR_PTHREADS)
+    if (isCurrent) {
+        (void) setjmp(t->md.jb);
+    }
+    *np = sizeof(t->md.jb) / sizeof(PRWord);
+    return (PRWord *) (t->md.jb);
+#else
+	*np = 0;
+	return NULL;
+#endif
+}
+
+void _MD_EarlyInit(void)
+{
+#if !defined(_PR_PTHREADS)
+    char *eval;
+    int fd;
+	extern int __ateachexit(void (*func)(void));
+
+    sigemptyset(&ints_off);
+    sigaddset(&ints_off, SIGALRM);
+    sigaddset(&ints_off, SIGIO);
+    sigaddset(&ints_off, SIGCLD);
+
+    if (eval = getenv("_NSPR_TERMINATE_ON_ERROR"))
+        _nspr_terminate_on_error = (0 == atoi(eval) == 0) ? PR_FALSE : PR_TRUE;
+
+    fd = open("/dev/zero",O_RDWR , 0);
+    if (fd < 0) {
+        perror("open /dev/zero failed");
+        exit(1);
+    }
+    /*
+     * Set up the sproc private data area.
+     * This region exists at the same address, _nspr_sproc_private, for
+     * every sproc, but each sproc gets a private copy of the region.
+     */
+    _nspr_sproc_private = (char*)mmap(0, _pr_pageSize, PROT_READ | PROT_WRITE,
+        MAP_PRIVATE| MAP_LOCAL, fd, 0);
+    if (_nspr_sproc_private == (void*)-1) {
+        perror("mmap /dev/zero failed");
+        exit(1);
+    }
+	_MD_SET_SPROC_PID(getpid());	
+    close(fd);
+	__ateachexit(irix_detach_sproc);
+#endif
+    _MD_IrixIntervalInit();
+}  /* _MD_EarlyInit */
+
+void _MD_IrixInit(void)
+{
+#if !defined(_PR_PTHREADS)
+    struct sigaction sigact;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+	int rv;
+
+#ifdef _PR_HAVE_SGI_PRDA_PROCMASK
+	/*
+	 * enable user-level processing of sigprocmask(); this is an undocumented
+	 * feature available in Irix 6.2, 6.3, 6.4 and 6.5
+	 */
+	__sgi_prda_procmask(USER_LEVEL);
+#endif
+
+	/*
+	 * set up SIGUSR1 handler; this is used to save state
+	 * during PR_SuspendAll
+	 */
+	sigact.sa_handler = save_context_and_block;
+	sigact.sa_flags = SA_RESTART;
+	sigact.sa_mask = ints_off;
+	sigaction(SIGUSR1, &sigact, 0);
+
+    /*
+     * Change the name of the core file from core to core.pid,
+     * This is inherited by the sprocs created by this process
+     */
+#ifdef PR_COREPID
+    prctl(PR_COREPID, 0, 1);
+#endif
+    /*
+     * Irix-specific terminate on error processing
+     */
+	/*
+	 * PR_SETABORTSIG is a new command implemented in a patch to
+	 * Irix 6.2, 6.3 and 6.4. This causes a signal to be sent to all
+	 * sprocs in the process when one of them terminates abnormally
+	 *
+	 */
+	if (prctl(PR_SETABORTSIG, SIGKILL) < 0) {
+		/*
+		 *  if (errno == EINVAL)
+		 *
+		 *	PR_SETABORTSIG not supported under this OS.
+		 *	You may want to get a recent kernel rollup patch that
+		 *	supports this feature.
+		 *
+		 */
+	}
+	/*
+	 * PR_SETEXITSIG -  send the SIGCLD signal to the parent
+	 *            sproc when any sproc terminates
+	 *
+	 *    This is used to cause the entire application to
+	 *    terminate when    any sproc terminates abnormally by
+	 *     receipt of a SIGSEGV, SIGBUS or SIGABRT signal.
+	 *    If this is not done, the application may seem
+	 *     "hung" to the user because the other sprocs may be
+	 *    waiting for resources held by the
+	 *    abnormally-terminating sproc.
+	 */
+	prctl(PR_SETEXITSIG, 0);
+
+	sigact.sa_handler = sigchld_handler;
+	sigact.sa_flags = SA_RESTART;
+	sigact.sa_mask = ints_off;
+	sigaction(SIGCLD, &sigact, NULL);
+
+    /*
+     * setup stack fields for the primordial thread
+     */
+    me->stack->stackSize = prctl(PR_GETSTACKSIZE);
+    me->stack->stackBottom = me->stack->stackTop - me->stack->stackSize;
+
+    rv = pipe(_pr_irix_primoridal_cpu_fd);
+    PR_ASSERT(rv == 0);
+#ifndef _PR_USE_POLL
+    _PR_IOQ_MAX_OSFD(me->cpu) = _pr_irix_primoridal_cpu_fd[0];
+    FD_SET(_pr_irix_primoridal_cpu_fd[0], &_PR_FD_READ_SET(me->cpu));
+#endif
+
+	libc_handle = dlopen("libc.so",RTLD_NOW);
+	PR_ASSERT(libc_handle != NULL);
+	libc_exit = (void (*)(int)) dlsym(libc_handle, "exit");
+	PR_ASSERT(libc_exit != NULL);
+	/* dlclose(libc_handle); */
+
+#endif /* _PR_PTHREADS */
+
+    _PR_UnixInit();
+}
+
+/**************************************************************************/
+/************** code and such for NSPR 2.0's interval times ***************/
+/**************************************************************************/
+
+#define PR_PSEC_PER_SEC 1000000000000ULL  /* 10^12 */
+
+#ifndef SGI_CYCLECNTR_SIZE
+#define SGI_CYCLECNTR_SIZE      165     /* Size user needs to use to read CC */
+#endif
+
+static PRIntn mmem_fd = -1;
+static PRIntn clock_width = 0;
+static void *iotimer_addr = NULL;
+static PRUint32 pr_clock_mask = 0;
+static PRUint32 pr_clock_shift = 0;
+static PRIntervalTime pr_ticks = 0;
+static PRUint32 pr_clock_granularity = 1;
+static PRUint32 pr_previous = 0, pr_residual = 0;
+static PRUint32 pr_ticks_per_second = 0;
+
+extern PRIntervalTime _PR_UNIX_GetInterval(void);
+extern PRIntervalTime _PR_UNIX_TicksPerSecond(void);
+
+static void _MD_IrixIntervalInit(void)
+{
+    /*
+     * As much as I would like, the service available through this
+     * interface on R3000's (aka, IP12) just isn't going to make it.
+     * The register is only 24 bits wide, and rolls over at a verocious
+     * rate.
+     */
+    PRUint32 one_tick = 0;
+    struct utsname utsinfo;
+    uname(&utsinfo);
+    if ((strncmp("IP12", utsinfo.machine, 4) != 0)
+        && ((mmem_fd = open("/dev/mmem", O_RDONLY)) != -1))
+    {
+        int poffmask = getpagesize() - 1;
+        __psunsigned_t phys_addr, raddr, cycleval;
+
+        phys_addr = syssgi(SGI_QUERY_CYCLECNTR, &cycleval);
+        raddr = phys_addr & ~poffmask;
+        iotimer_addr = mmap(
+            0, poffmask, PROT_READ, MAP_PRIVATE, mmem_fd, (__psint_t)raddr);
+
+        clock_width = syssgi(SGI_CYCLECNTR_SIZE);
+        if (clock_width < 0)
+        {
+            /* 
+             * We must be executing on a 6.0 or earlier system, since the
+             * SGI_CYCLECNTR_SIZE call is not supported.
+             * 
+             * The only pre-6.1 platforms with 64-bit counters are
+             * IP19 and IP21 (Challenge, PowerChallenge, Onyx).
+             */
+            if (!strncmp(utsinfo.machine, "IP19", 4) ||
+                !strncmp(utsinfo.machine, "IP21", 4))
+                clock_width = 64;
+            else
+                clock_width = 32;
+        }
+
+        /*
+         * 'cycleval' is picoseconds / increment of the counter.
+         * I'm pushing for a tick to be 100 microseconds, 10^(-4).
+         * That leaves 10^(-8) left over, or 10^8 / cycleval.
+         * Did I do that right?
+         */
+
+        one_tick =  100000000UL / cycleval ;  /* 100 microseconds */
+
+        while (0 != one_tick)
+        {
+            pr_clock_shift += 1;
+            one_tick = one_tick >> 1;
+            pr_clock_granularity = pr_clock_granularity << 1;
+        }
+        pr_clock_mask = pr_clock_granularity - 1;  /* to make a mask out of it */
+        pr_ticks_per_second = PR_PSEC_PER_SEC
+                / ((PRUint64)pr_clock_granularity * (PRUint64)cycleval);
+            
+        iotimer_addr = (void*)
+            ((__psunsigned_t)iotimer_addr + (phys_addr & poffmask));
+    }
+    else
+    {
+        pr_ticks_per_second = _PR_UNIX_TicksPerSecond();
+    }
+}  /* _MD_IrixIntervalInit */
+
+PRIntervalTime _MD_IrixIntervalPerSec(void)
+{
+    return pr_ticks_per_second;
+}
+
+PRIntervalTime _MD_IrixGetInterval(void)
+{
+    if (mmem_fd != -1)
+    {
+        if (64 == clock_width)
+        {
+            PRUint64 temp = *(PRUint64*)iotimer_addr;
+            pr_ticks = (PRIntervalTime)(temp >> pr_clock_shift);
+        }
+        else
+        {
+            PRIntervalTime ticks = pr_ticks;
+            PRUint32 now = *(PRUint32*)iotimer_addr, temp;
+            PRUint32 residual = pr_residual, previous = pr_previous;
+
+            temp = now - previous + residual;
+            residual = temp & pr_clock_mask;
+            ticks += temp >> pr_clock_shift;
+
+            pr_previous = now;
+            pr_residual = residual;
+            pr_ticks = ticks;
+        }
+    }
+    else
+    {
+        /*
+         * No fast access. Use the time of day clock. This isn't the
+         * right answer since this clock can get set back, tick at odd
+         * rates, and it's expensive to acqurie.
+         */
+        pr_ticks = _PR_UNIX_GetInterval();
+    }
+    return pr_ticks;
+}  /* _MD_IrixGetInterval */
+
diff --git a/nsprpub/pr/src/md/unix/linux.c b/nsprpub/pr/src/md/unix/linux.c
new file mode 100644
index 000000000..1b485a024
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/linux.c
@@ -0,0 +1,91 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+void _MD_EarlyInit(void)
+{
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+#ifndef _PR_PTHREADS
+    if (isCurrent) {
+	(void) setjmp(CONTEXT(t));
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+#else
+	*np = 0;
+	return NULL;
+#endif
+}
+
+#ifdef _PR_PTHREADS
+
+extern void _MD_unix_terminate_waitpid_daemon(void);
+
+void _MD_CleanupBeforeExit(void)
+{
+    _MD_unix_terminate_waitpid_daemon();
+}
+
+#else /* ! _PR_PTHREADS */
+
+void
+_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
+{
+    return;
+}
+
+PRStatus
+_MD_InitializeThread(PRThread *thread)
+{
+	/*
+	 * set the pointers to the stack-pointer and frame-pointer words in the
+	 * context structure; this is for debugging use.
+	 */
+	thread->md.sp = _MD_GET_SP_PTR(thread);
+	thread->md.fp = _MD_GET_FP_PTR(thread);
+	return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread) {
+	PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    }
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for Linux */
+void
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for Linux.");
+}
+
+PRStatus
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for Linux.");
+	return PR_FAILURE;
+}
+#endif /* ! _PR_PTHREADS */
diff --git a/nsprpub/pr/src/md/unix/netbsd.c b/nsprpub/pr/src/md/unix/netbsd.c
new file mode 100644
index 000000000..aa3618a31
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/netbsd.c
@@ -0,0 +1,89 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+#include <signal.h>
+#include <poll.h>
+#include <sys/syscall.h>
+
+void _MD_EarlyInit(void)
+{
+    /*
+     * Ignore FPE because coercion of a NaN to an int causes SIGFPE
+     * to be raised.
+     */
+    struct sigaction act;
+
+    act.sa_handler = SIG_IGN;
+    sigemptyset(&act.sa_mask);
+    act.sa_flags = SA_RESTART;
+    sigaction(SIGFPE, &act, 0);
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+#ifndef _PR_PTHREADS
+    if (isCurrent) {
+        (void) sigsetjmp(CONTEXT(t), 1);
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+#else
+    *np = 0;
+    return NULL;
+#endif
+}
+
+#ifndef _PR_PTHREADS
+void
+_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
+{
+    return;
+}
+
+PRStatus
+_MD_InitializeThread(PRThread *thread)
+{
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread) {
+        PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    }
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for NetBSD */
+void
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for NetBSD.");
+}
+
+PRStatus
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for NetBSD.");
+    return PR_FAILURE;
+}
+#endif /* ! _PR_PTHREADS */
diff --git a/nsprpub/pr/src/md/unix/nto.c b/nsprpub/pr/src/md/unix/nto.c
new file mode 100644
index 000000000..e41d665ca
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/nto.c
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+#include <setjmp.h>
+
+/* Fake this out */
+int socketpair (int foo, int foo2, int foo3, int sv[2])
+{
+	printf("error in socketpair\n");
+	exit (-1);
+}
+
+void _MD_EarlyInit(void)
+{
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+#ifndef _PR_PTHREADS
+    if (isCurrent) {
+    (void) setjmp(CONTEXT(t));
+    }
+
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+#else
+	*np = 0;
+	return NULL;
+#endif
+}
diff --git a/nsprpub/pr/src/md/unix/objs.mk b/nsprpub/pr/src/md/unix/objs.mk
new file mode 100644
index 000000000..77eaa6d13
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/objs.mk
@@ -0,0 +1,31 @@
+# 
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# This makefile appends to the variable OBJS the platform-dependent
+# object modules that will be part of the nspr20 library.
+
+CSRCS =          \
+	unix.c    \
+	unix_errors.c \
+	uxproces.c \
+	uxrng.c \
+	uxshm.c \
+	uxwrap.c \
+	$(NULL)
+
+ifneq ($(USE_PTHREADS),1)
+CSRCS += uxpoll.c
+endif
+
+ifeq ($(PTHREADS_USER),1)
+CSRCS += pthreads_user.c
+endif
+
+CSRCS	+= $(PR_MD_CSRCS)
+ASFILES += $(PR_MD_ASFILES)
+
+OBJS += $(addprefix md/unix/$(OBJDIR)/,$(CSRCS:.c=.$(OBJ_SUFFIX)))  \
+	$(addprefix md/unix/$(OBJDIR)/,$(ASFILES:.s=.$(OBJ_SUFFIX)))
+
diff --git a/nsprpub/pr/src/md/unix/openbsd.c b/nsprpub/pr/src/md/unix/openbsd.c
new file mode 100644
index 000000000..b7f0a2995
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/openbsd.c
@@ -0,0 +1,89 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+#include <signal.h>
+#include <poll.h>
+#include <sys/syscall.h>
+
+void _MD_EarlyInit(void)
+{
+    /*
+     * Ignore FPE because coercion of a NaN to an int causes SIGFPE
+     * to be raised.
+     */
+    struct sigaction act;
+
+    act.sa_handler = SIG_IGN;
+    sigemptyset(&act.sa_mask);
+    act.sa_flags = SA_RESTART;
+    sigaction(SIGFPE, &act, 0);
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+#ifndef _PR_PTHREADS
+    if (isCurrent) {
+        (void) sigsetjmp(CONTEXT(t), 1);
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+#else
+    *np = 0;
+    return NULL;
+#endif
+}
+
+#ifndef _PR_PTHREADS
+void
+_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
+{
+    return;
+}
+
+PRStatus
+_MD_InitializeThread(PRThread *thread)
+{
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread) {
+        PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    }
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for OpenBSD */
+void
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for OpenBSD.");
+}
+
+PRStatus
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for OpenBSD.");
+    return PR_FAILURE;
+}
+#endif /* ! _PR_PTHREADS */
diff --git a/nsprpub/pr/src/md/unix/os_AIX.s b/nsprpub/pr/src/md/unix/os_AIX.s
new file mode 100644
index 000000000..0227cc47f
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_AIX.s
@@ -0,0 +1,91 @@
+# -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+# 
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+.set r0,0; .set SP,1; .set RTOC,2; .set r3,3; .set r4,4
+.set r5,5; .set r6,6; .set r7,7; .set r8,8; .set r9,9
+.set r10,10; .set r11,11; .set r12,12; .set r13,13; .set r14,14
+.set r15,15; .set r16,16; .set r17,17; .set r18,18; .set r19,19
+.set r20,20; .set r21,21; .set r22,22; .set r23,23; .set r24,24
+.set r25,25; .set r26,26; .set r27,27; .set r28,28; .set r29,29
+.set r30,30; .set r31,31
+
+
+        .rename H.10.NO_SYMBOL{PR},""
+        .rename H.18.longjmp{TC},"longjmp"
+
+        .lglobl H.10.NO_SYMBOL{PR}
+        .globl  .longjmp
+        .globl  longjmp{DS}
+        .extern .sigcleanup
+        .extern .jmprestfpr
+
+# .text section
+
+        .csect  H.10.NO_SYMBOL{PR}
+.longjmp:
+         mr   r13,r3
+         mr   r14,r4
+        stu   SP,-56(SP)
+         bl   .sigcleanup
+          l   RTOC,0x14(SP)
+        cal   SP,0x38(SP)
+         mr   r3,r13
+         mr   r4,r14
+          l   r5,0x8(r3)
+          l   SP,0xc(r3)
+          l   r7,0xf8(r3)
+         st   r7,0x0(SP)
+          l   RTOC,0x10(r3)
+         bl   .jmprestfpr
+# 1 == cr0 in disassembly
+       cmpi   1,r4,0x0  
+       mtlr   r5
+         lm   r13,0x14(r3)
+          l   r5,0x60(r3)
+      mtcrf   0x38,r5
+         mr   r3,r4
+        bne   __L1
+        lil   r3,0x1
+__L1:
+         br
+
+# traceback table
+        .long   0x00000000
+        .byte   0x00                    # VERSION=0
+        .byte   0x00                    # LANG=TB_C
+        .byte   0x20                    # IS_GL=0,IS_EPROL=0,HAS_TBOFF=1
+                                        # INT_PROC=0,HAS_CTL=0,TOCLESS=0
+                                        # FP_PRESENT=0,LOG_ABORT=0
+        .byte   0x40                    # INT_HNDL=0,NAME_PRESENT=1
+                                        # USES_ALLOCA=0,CL_DIS_INV=WALK_ONCOND
+                                        # SAVES_CR=0,SAVES_LR=0
+        .byte   0x80                    # STORES_BC=1,FPR_SAVED=0
+        .byte   0x00                    # GPR_SAVED=0
+        .byte   0x02                    # FIXEDPARMS=2
+        .byte   0x01                    # FLOATPARMS=0,PARMSONSTK=1
+        .long   0x00000000              #
+        .long   0x00000014              # TB_OFFSET
+        .short  7                       # NAME_LEN
+        .byte   "longjmp"
+        .byte   0                       # padding
+        .byte   0                       # padding
+        .byte   0                       # padding
+# End of traceback table
+        .long   0x00000000              # "\0\0\0\0"
+
+# .data section
+
+        .toc                            # 0x00000038
+T.18.longjmp:
+        .tc     H.18.longjmp{TC},longjmp{DS}
+
+        .csect  longjmp{DS}
+        .long   .longjmp                # "\0\0\0\0"
+        .long   TOC{TC0}                # "\0\0\0008"
+        .long   0x00000000              # "\0\0\0\0"
+# End   csect   longjmp{DS}
+
+# .bss section
diff --git a/nsprpub/pr/src/md/unix/os_BSD_386_2.s b/nsprpub/pr/src/md/unix/os_BSD_386_2.s
new file mode 100644
index 000000000..fa36599e7
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_BSD_386_2.s
@@ -0,0 +1,42 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * os_BSD_386_2.s
+ * We need to define our own setjmp/longjmp on BSDI 2.x because libc's
+ * implementation does some sanity checking that defeats user level threads.
+ * This should no longer be necessary in BSDI 3.0.
+ */
+
+.globl _setjmp
+.align 2
+_setjmp:
+		movl	4(%esp),%eax
+		movl	0(%esp),%edx
+		movl	%edx, 0(%eax)           /* rta */
+		movl	%ebx, 4(%eax)
+		movl	%esp, 8(%eax)
+		movl	%ebp,12(%eax)
+		movl	%esi,16(%eax)
+		movl	%edi,20(%eax)
+		movl	$0,%eax
+		ret
+ 
+.globl _longjmp
+.align 2
+_longjmp:
+		movl	4(%esp),%edx
+		movl	8(%esp),%eax
+		movl	0(%edx),%ecx
+		movl	4(%edx),%ebx
+		movl	8(%edx),%esp
+		movl	12(%edx),%ebp
+		movl	16(%edx),%esi
+		movl	20(%edx),%edi
+		cmpl	$0,%eax
+		jne		1f
+		movl	$1,%eax
+1:		movl	%ecx,0(%esp)
+		ret
diff --git a/nsprpub/pr/src/md/unix/os_Darwin.s b/nsprpub/pr/src/md/unix/os_Darwin.s
new file mode 100644
index 000000000..26a0b9226
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_Darwin.s
@@ -0,0 +1,13 @@
+# -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifdef __i386__
+#include "os_Darwin_x86.s"
+#elif defined(__x86_64__)
+#include "os_Darwin_x86_64.s"
+#elif defined(__ppc__)
+#include "os_Darwin_ppc.s"
+#endif
diff --git a/nsprpub/pr/src/md/unix/os_Darwin_ppc.s b/nsprpub/pr/src/md/unix/os_Darwin_ppc.s
new file mode 100644
index 000000000..8479dec01
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_Darwin_ppc.s
@@ -0,0 +1,68 @@
+# -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#
+# Based on the programming examples in The PowerPC Architecture:
+# A Specification for A New Family of RISC Processors, 2nd Ed.,
+# Book I, Section E.1, "Synchronization," pp. 249-256, May 1994.
+#
+
+.text
+
+#
+# PRInt32 __PR_DarwinPPC_AtomicIncrement(PRInt32 *val);
+#
+        .align  2
+        .globl  __PR_DarwinPPC_AtomicIncrement
+        .private_extern __PR_DarwinPPC_AtomicIncrement
+__PR_DarwinPPC_AtomicIncrement:
+        lwarx   r4,0,r3
+        addi    r0,r4,1
+        stwcx.  r0,0,r3
+        bne-    __PR_DarwinPPC_AtomicIncrement
+        mr      r3,r0
+        blr
+
+#
+# PRInt32 __PR_DarwinPPC_AtomicDecrement(PRInt32 *val);
+#
+        .align  2
+        .globl  __PR_DarwinPPC_AtomicDecrement
+        .private_extern __PR_DarwinPPC_AtomicDecrement
+__PR_DarwinPPC_AtomicDecrement:
+        lwarx   r4,0,r3
+        addi    r0,r4,-1
+        stwcx.  r0,0,r3
+        bne-    __PR_DarwinPPC_AtomicDecrement
+        mr      r3,r0
+        blr
+
+#
+# PRInt32 __PR_DarwinPPC_AtomicSet(PRInt32 *val, PRInt32 newval);
+#
+        .align  2
+        .globl  __PR_DarwinPPC_AtomicSet
+        .private_extern __PR_DarwinPPC_AtomicSet
+__PR_DarwinPPC_AtomicSet:
+        lwarx   r5,0,r3
+        stwcx.  r4,0,r3
+        bne-    __PR_DarwinPPC_AtomicSet
+        mr      r3,r5
+        blr
+
+#
+# PRInt32 __PR_DarwinPPC_AtomicAdd(PRInt32 *ptr, PRInt32 val);
+#
+        .align  2
+        .globl  __PR_DarwinPPC_AtomicAdd
+        .private_extern __PR_DarwinPPC_AtomicAdd
+__PR_DarwinPPC_AtomicAdd:
+        lwarx   r5,0,r3
+        add     r0,r4,r5
+        stwcx.  r0,0,r3
+        bne-    __PR_DarwinPPC_AtomicAdd
+        mr      r3,r0
+        blr
diff --git a/nsprpub/pr/src/md/unix/os_Darwin_x86.s b/nsprpub/pr/src/md/unix/os_Darwin_x86.s
new file mode 100644
index 000000000..fc6379f95
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_Darwin_x86.s
@@ -0,0 +1,80 @@
+# -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#
+# Based on os_Linux_x86.s
+#
+
+#
+# PRInt32 __PR_Darwin_x86_AtomicIncrement(PRInt32 *val);
+#
+# Atomically increment the integer pointed to by 'val' and return
+# the result of the increment.
+#
+    .text
+    .globl __PR_Darwin_x86_AtomicIncrement
+    .private_extern __PR_Darwin_x86_AtomicIncrement
+    .align 4
+__PR_Darwin_x86_AtomicIncrement:
+    movl 4(%esp), %ecx
+    movl $1, %eax
+    lock
+    xaddl %eax, (%ecx)
+    incl %eax
+    ret
+
+#
+# PRInt32 __PR_Darwin_x86_AtomicDecrement(PRInt32 *val);
+#
+# Atomically decrement the integer pointed to by 'val' and return
+# the result of the decrement.
+#
+    .text
+    .globl __PR_Darwin_x86_AtomicDecrement
+    .private_extern __PR_Darwin_x86_AtomicDecrement
+    .align 4
+__PR_Darwin_x86_AtomicDecrement:
+    movl 4(%esp), %ecx
+    movl $-1, %eax
+    lock
+    xaddl %eax, (%ecx)
+    decl %eax
+    ret
+
+#
+# PRInt32 __PR_Darwin_x86_AtomicSet(PRInt32 *val, PRInt32 newval);
+#
+# Atomically set the integer pointed to by 'val' to the new
+# value 'newval' and return the old value.
+#
+    .text
+    .globl __PR_Darwin_x86_AtomicSet
+    .private_extern __PR_Darwin_x86_AtomicSet
+    .align 4
+__PR_Darwin_x86_AtomicSet:
+    movl 4(%esp), %ecx
+    movl 8(%esp), %eax
+    xchgl %eax, (%ecx)
+    ret
+
+#
+# PRInt32 __PR_Darwin_x86_AtomicAdd(PRInt32 *ptr, PRInt32 val);
+#
+# Atomically add 'val' to the integer pointed to by 'ptr'
+# and return the result of the addition.
+#
+    .text
+    .globl __PR_Darwin_x86_AtomicAdd
+    .private_extern __PR_Darwin_x86_AtomicAdd
+    .align 4
+__PR_Darwin_x86_AtomicAdd:
+    movl 4(%esp), %ecx
+    movl 8(%esp), %eax
+    movl %eax, %edx
+    lock
+    xaddl %eax, (%ecx)
+    addl %edx, %eax
+    ret
diff --git a/nsprpub/pr/src/md/unix/os_Darwin_x86_64.s b/nsprpub/pr/src/md/unix/os_Darwin_x86_64.s
new file mode 100644
index 000000000..449aaa5db
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_Darwin_x86_64.s
@@ -0,0 +1,67 @@
+# -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+# 
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# PRInt32 __PR_Darwin_x86_64_AtomicIncrement(PRInt32 *val)
+#
+# Atomically increment the integer pointed to by 'val' and return
+# the result of the increment.
+#
+    .text
+    .globl __PR_Darwin_x86_64_AtomicIncrement
+    .private_extern __PR_Darwin_x86_64_AtomicIncrement
+    .align 4
+__PR_Darwin_x86_64_AtomicIncrement:
+    movl $1, %eax
+    lock
+    xaddl %eax, (%rdi)
+    incl %eax
+    ret
+
+# PRInt32 __PR_Darwin_x86_64_AtomicDecrement(PRInt32 *val)
+#
+# Atomically decrement the integer pointed to by 'val' and return
+# the result of the decrement.
+#
+    .text
+    .globl __PR_Darwin_x86_64_AtomicDecrement
+    .private_extern __PR_Darwin_x86_64_AtomicDecrement
+    .align 4
+__PR_Darwin_x86_64_AtomicDecrement:
+    movl $-1, %eax
+    lock
+    xaddl %eax, (%rdi)
+    decl %eax
+    ret
+
+# PRInt32 __PR_Darwin_x86_64_AtomicSet(PRInt32 *val, PRInt32 newval)
+#
+# Atomically set the integer pointed to by 'val' to the new
+# value 'newval' and return the old value.
+#
+    .text
+    .globl __PR_Darwin_x86_64_AtomicSet
+    .private_extern __PR_Darwin_x86_64_AtomicSet
+    .align 4
+__PR_Darwin_x86_64_AtomicSet:
+    movl %esi, %eax
+    xchgl %eax, (%rdi)
+    ret
+
+# PRInt32 __PR_Darwin_x86_64_AtomicAdd(PRInt32 *ptr, PRInt32 val)
+#
+# Atomically add 'val' to the integer pointed to by 'ptr'
+# and return the result of the addition.
+#
+    .text
+    .globl __PR_Darwin_x86_64_AtomicAdd
+    .private_extern __PR_Darwin_x86_64_AtomicAdd
+    .align 4
+__PR_Darwin_x86_64_AtomicAdd:
+    movl %esi, %eax
+    lock
+    xaddl %eax, (%rdi)
+    addl %esi, %eax
+    ret
diff --git a/nsprpub/pr/src/md/unix/os_HPUX.s b/nsprpub/pr/src/md/unix/os_HPUX.s
new file mode 100644
index 000000000..f8ecabf9b
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_HPUX.s
@@ -0,0 +1,25 @@
+; 
+; This Source Code Form is subject to the terms of the Mozilla Public
+; License, v. 2.0. If a copy of the MPL was not distributed with this
+; file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifdef __LP64__
+        .LEVEL   2.0W
+#else
+        .LEVEL   1.1
+#endif
+
+	.CODE	; equivalent to the following two lines
+;       .SPACE   $TEXT$,SORT=8
+;       .SUBSPA  $CODE$,QUAD=0,ALIGN=4,ACCESS=0x2c,CODE_ONLY,SORT=24
+
+ret_cr16
+	.PROC
+	.CALLINFO 	FRAME=0, NO_CALLS
+	.EXPORT 	ret_cr16,ENTRY
+	.ENTRY
+	BV		%r0(%rp)
+        .EXIT
+	MFCTL		%cr16,%ret0
+        .PROCEND
+        .END
diff --git a/nsprpub/pr/src/md/unix/os_HPUX_ia64.s b/nsprpub/pr/src/md/unix/os_HPUX_ia64.s
new file mode 100644
index 000000000..302ae7687
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_HPUX_ia64.s
@@ -0,0 +1,80 @@
+// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+// 
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+.text
+
+// PRInt32 _PR_ia64_AtomicIncrement(PRInt32 *val)
+//
+// Atomically increment the integer pointed to by 'val' and return
+// the result of the increment.
+//
+        .align 16
+        .global _PR_ia64_AtomicIncrement#
+        .proc _PR_ia64_AtomicIncrement#
+_PR_ia64_AtomicIncrement:
+#ifndef _LP64
+        addp4 r32 = 0, r32  ;;
+#endif
+        fetchadd4.acq r8 = [r32], 1  ;;
+        adds r8 = 1, r8
+        br.ret.sptk.many b0
+        .endp _PR_ia64_AtomicIncrement#
+
+// PRInt32 _PR_ia64_AtomicDecrement(PRInt32 *val)
+//
+// Atomically decrement the integer pointed to by 'val' and return
+// the result of the decrement.
+//
+        .align 16
+        .global _PR_ia64_AtomicDecrement#
+        .proc _PR_ia64_AtomicDecrement#
+_PR_ia64_AtomicDecrement:
+#ifndef _LP64
+        addp4 r32 = 0, r32  ;;
+#endif
+        fetchadd4.rel r8 = [r32], -1  ;;
+        adds r8 = -1, r8
+        br.ret.sptk.many b0
+        .endp _PR_ia64_AtomicDecrement#
+
+// PRInt32 _PR_ia64_AtomicAdd(PRInt32 *ptr, PRInt32 val)
+//
+// Atomically add 'val' to the integer pointed to by 'ptr'
+// and return the result of the addition.
+//
+        .align 16
+        .global _PR_ia64_AtomicAdd#
+        .proc _PR_ia64_AtomicAdd#
+_PR_ia64_AtomicAdd:
+#ifndef _LP64
+        addp4 r32 = 0, r32  ;;
+#endif
+        ld4 r15 = [r32]  ;;
+.L3:
+        mov r14 = r15
+        mov ar.ccv = r15
+        add r8 = r15, r33  ;;
+        cmpxchg4.acq r15 = [r32], r8, ar.ccv  ;;
+        cmp4.ne p6, p7 =  r15, r14
+        (p6) br.cond.dptk .L3
+        br.ret.sptk.many b0
+        .endp _PR_ia64_AtomicAdd#
+
+// PRInt32 _PR_ia64_AtomicSet(PRInt32 *val, PRInt32 newval)
+//
+// Atomically set the integer pointed to by 'val' to the new
+// value 'newval' and return the old value.
+//
+        .align 16
+        .global _PR_ia64_AtomicSet#
+        .proc _PR_ia64_AtomicSet#
+_PR_ia64_AtomicSet:
+#ifndef _LP64
+        addp4 r32 = 0, r32  ;;
+#endif
+        xchg4 r8 = [r32], r33
+        br.ret.sptk.many b0
+        .endp _PR_ia64_AtomicSet#
diff --git a/nsprpub/pr/src/md/unix/os_Irix.s b/nsprpub/pr/src/md/unix/os_Irix.s
new file mode 100644
index 000000000..ab1cb0b30
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_Irix.s
@@ -0,0 +1,134 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* 
+ *  Atomically add a new element to the top of the stack
+ *
+ *  usage : PR_StackPush(listp, elementp);
+ *  -----------------------
+ */
+
+#include "md/_irix.h"
+#ifdef _PR_HAVE_ATOMIC_CAS
+
+#include <sys/asm.h>
+#include <sys/regdef.h>
+
+LEAF(PR_StackPush)
+
+retry_push:
+.set noreorder
+		lw		v0,0(a0)
+		li		t1,1
+		beq		v0,t1,retry_push
+		move	t0,a1
+
+        ll      v0,0(a0)
+		beq		v0,t1,retry_push
+		nop
+		sc		t1,0(a0)	
+		beq		t1,0,retry_push
+		nop
+		sw		v0,0(a1)
+		sync
+		sw		t0,0(a0)
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		jr		ra
+		nop
+
+END(PR_StackPush)
+
+/*
+ *
+ *  Atomically remove the element at the top of the stack
+ *
+ *  usage : elemep = PR_StackPop(listp);
+ *
+ */
+
+LEAF(PR_StackPop)
+retry_pop:
+.set noreorder
+
+
+		lw		v0,0(a0)
+		li		t1,1
+		beq		v0,0,done
+		nop	
+		beq		v0,t1,retry_pop
+		nop	
+
+        ll      v0,0(a0)
+		beq		v0,0,done
+		nop
+		beq		v0,t1,retry_pop
+		nop
+		sc		t1,0(a0)	
+		beq		t1,0,retry_pop
+		nop
+		lw		t0,0(v0)
+		sw		t0,0(a0)
+done:
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		nop
+		jr		ra
+		nop
+
+END(PR_StackPop)
+
+#endif /* _PR_HAVE_ATOMIC_CAS */
diff --git a/nsprpub/pr/src/md/unix/os_Linux_ia64.s b/nsprpub/pr/src/md/unix/os_Linux_ia64.s
new file mode 100644
index 000000000..fef24ad10
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_Linux_ia64.s
@@ -0,0 +1,71 @@
+// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+// 
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+.text
+
+// PRInt32 _PR_ia64_AtomicIncrement(PRInt32 *val)
+//
+// Atomically increment the integer pointed to by 'val' and return
+// the result of the increment.
+//
+        .align 16
+        .global _PR_ia64_AtomicIncrement#
+        .proc _PR_ia64_AtomicIncrement#
+_PR_ia64_AtomicIncrement:
+        fetchadd4.acq r8 = [r32], 1  ;;
+        adds r8 = 1, r8
+        br.ret.sptk.many b0
+        .endp _PR_ia64_AtomicIncrement#
+
+// PRInt32 _PR_ia64_AtomicDecrement(PRInt32 *val)
+//
+// Atomically decrement the integer pointed to by 'val' and return
+// the result of the decrement.
+//
+        .align 16
+        .global _PR_ia64_AtomicDecrement#
+        .proc _PR_ia64_AtomicDecrement#
+_PR_ia64_AtomicDecrement:
+        fetchadd4.rel r8 = [r32], -1  ;;
+        adds r8 = -1, r8
+        br.ret.sptk.many b0
+        .endp _PR_ia64_AtomicDecrement#
+
+// PRInt32 _PR_ia64_AtomicAdd(PRInt32 *ptr, PRInt32 val)
+//
+// Atomically add 'val' to the integer pointed to by 'ptr'
+// and return the result of the addition.
+//
+        .align 16
+        .global _PR_ia64_AtomicAdd#
+        .proc _PR_ia64_AtomicAdd#
+_PR_ia64_AtomicAdd:
+        ld4 r15 = [r32]  ;;
+.L3:
+        mov r14 = r15
+        mov ar.ccv = r15
+        add r8 = r15, r33  ;;
+        cmpxchg4.acq r15 = [r32], r8, ar.ccv  ;;
+        cmp4.ne p6, p7 =  r15, r14
+        (p6) br.cond.dptk .L3
+        br.ret.sptk.many b0
+        .endp _PR_ia64_AtomicAdd#
+
+// PRInt32 _PR_ia64_AtomicSet(PRInt32 *val, PRInt32 newval)
+//
+// Atomically set the integer pointed to by 'val' to the new
+// value 'newval' and return the old value.
+//
+        .align 16
+        .global _PR_ia64_AtomicSet#
+        .proc _PR_ia64_AtomicSet#
+_PR_ia64_AtomicSet:
+        xchg4 r8 = [r32], r33
+        br.ret.sptk.many b0
+        .endp _PR_ia64_AtomicSet#
+
+// Magic indicating no need for an executable stack
+.section .note.GNU-stack, "", @progbits ; .previous
diff --git a/nsprpub/pr/src/md/unix/os_Linux_ppc.s b/nsprpub/pr/src/md/unix/os_Linux_ppc.s
new file mode 100644
index 000000000..a9a83174a
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_Linux_ppc.s
@@ -0,0 +1,75 @@
+# -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#
+# Based on the programming examples in The PowerPC Architecture:
+# A Specification for A New Family of RISC Processors, 2nd Ed.,
+# Book I, Section E.1, "Synchronization," pp. 249-256, May 1994.
+#
+
+        .section ".text"
+
+#
+# PRInt32 _PR_ppc_AtomicIncrement(PRInt32 *val);
+#
+        .align  2
+        .globl  _PR_ppc_AtomicIncrement
+        .type _PR_ppc_AtomicIncrement,@function
+_PR_ppc_AtomicIncrement:
+.Lfd1:  lwarx   4,0,3
+        addi    0,4,1
+        stwcx.  0,0,3
+        bne-    .Lfd1
+        mr      3,0
+        blr
+.Lfe1:  .size _PR_ppc_AtomicIncrement,.Lfe1-_PR_ppc_AtomicIncrement
+
+#
+# PRInt32 _PR_ppc_AtomicDecrement(PRInt32 *val);
+#
+        .align  2
+        .globl  _PR_ppc_AtomicDecrement
+        .type _PR_ppc_AtomicDecrement,@function
+_PR_ppc_AtomicDecrement:
+.Lfd2:  lwarx   4,0,3
+        addi    0,4,-1
+        stwcx.  0,0,3
+        bne-    .Lfd2
+        mr      3,0
+        blr
+.Lfe2:  .size _PR_ppc_AtomicDecrement,.Lfe2-_PR_ppc_AtomicDecrement
+
+#
+# PRInt32 _PR_ppc_AtomicSet(PRInt32 *val, PRInt32 newval);
+#
+        .align  2
+        .globl  _PR_ppc_AtomicSet
+        .type _PR_ppc_AtomicSet,@function
+_PR_ppc_AtomicSet:
+.Lfd3:  lwarx   5,0,3
+        stwcx.  4,0,3
+        bne-    .Lfd3
+        mr      3,5
+        blr
+.Lfe3:  .size _PR_ppc_AtomicSet,.Lfe3-_PR_ppc_AtomicSet
+
+#
+# PRInt32 _PR_ppc_AtomicAdd(PRInt32 *ptr, PRInt32 val);
+#
+        .align  2
+        .globl  _PR_ppc_AtomicAdd
+        .type _PR_ppc_AtomicAdd,@function
+_PR_ppc_AtomicAdd:
+.Lfd4:  lwarx   5,0,3
+        add     0,4,5
+        stwcx.  0,0,3
+        bne-    .Lfd4
+        mr      3,0
+        blr
+.Lfe4:  .size _PR_ppc_AtomicAdd,.Lfe4-_PR_ppc_AtomicAdd
+
+# Magic indicating no need for an executable stack
+.section .note.GNU-stack, "", @progbits ; .previous
diff --git a/nsprpub/pr/src/md/unix/os_Linux_x86.s b/nsprpub/pr/src/md/unix/os_Linux_x86.s
new file mode 100644
index 000000000..a72acf5d7
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_Linux_x86.s
@@ -0,0 +1,85 @@
+// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+// 
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// PRInt32 _PR_x86_AtomicIncrement(PRInt32 *val)
+//
+// Atomically increment the integer pointed to by 'val' and return
+// the result of the increment.
+//
+    .text
+    .globl _PR_x86_AtomicIncrement
+    .align 4
+_PR_x86_AtomicIncrement:
+    movl 4(%esp), %ecx
+    movl $1, %eax
+    lock
+    xaddl %eax, (%ecx)
+    incl %eax
+    ret
+
+// PRInt32 _PR_x86_AtomicDecrement(PRInt32 *val)
+//
+// Atomically decrement the integer pointed to by 'val' and return
+// the result of the decrement.
+//
+    .text
+    .globl _PR_x86_AtomicDecrement
+    .align 4
+_PR_x86_AtomicDecrement:
+    movl 4(%esp), %ecx
+    movl $-1, %eax
+    lock
+    xaddl %eax, (%ecx)
+    decl %eax
+    ret
+
+// PRInt32 _PR_x86_AtomicSet(PRInt32 *val, PRInt32 newval)
+//
+// Atomically set the integer pointed to by 'val' to the new
+// value 'newval' and return the old value.
+//
+// An alternative implementation:
+//   .text
+//   .globl _PR_x86_AtomicSet
+//   .align 4
+//_PR_x86_AtomicSet:
+//   movl 4(%esp), %ecx
+//   movl 8(%esp), %edx
+//   movl (%ecx), %eax
+//retry:
+//   lock
+//   cmpxchgl %edx, (%ecx)
+//   jne retry
+//   ret
+//
+    .text
+    .globl _PR_x86_AtomicSet
+    .align 4
+_PR_x86_AtomicSet:
+    movl 4(%esp), %ecx
+    movl 8(%esp), %eax
+    xchgl %eax, (%ecx)
+    ret
+
+// PRInt32 _PR_x86_AtomicAdd(PRInt32 *ptr, PRInt32 val)
+//
+// Atomically add 'val' to the integer pointed to by 'ptr'
+// and return the result of the addition.
+//
+    .text
+    .globl _PR_x86_AtomicAdd
+    .align 4
+_PR_x86_AtomicAdd:
+    movl 4(%esp), %ecx
+    movl 8(%esp), %eax
+    movl %eax, %edx
+    lock
+    xaddl %eax, (%ecx)
+    addl %edx, %eax
+    ret
+
+// Magic indicating no need for an executable stack
+.section .note.GNU-stack, "", @progbits ; .previous
diff --git a/nsprpub/pr/src/md/unix/os_Linux_x86_64.s b/nsprpub/pr/src/md/unix/os_Linux_x86_64.s
new file mode 100644
index 000000000..8e491f0e6
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_Linux_x86_64.s
@@ -0,0 +1,74 @@
+// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+// 
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// PRInt32 _PR_x86_64_AtomicIncrement(PRInt32 *val)
+//
+// Atomically increment the integer pointed to by 'val' and return
+// the result of the increment.
+//
+    .text
+    .globl _PR_x86_64_AtomicIncrement
+    .type _PR_x86_64_AtomicIncrement, @function
+    .align 4
+_PR_x86_64_AtomicIncrement:
+    movl $1, %eax
+    lock
+    xaddl %eax, (%rdi)
+    incl %eax
+    ret
+    .size _PR_x86_64_AtomicIncrement, .-_PR_x86_64_AtomicIncrement
+
+// PRInt32 _PR_x86_64_AtomicDecrement(PRInt32 *val)
+//
+// Atomically decrement the integer pointed to by 'val' and return
+// the result of the decrement.
+//
+    .text
+    .globl _PR_x86_64_AtomicDecrement
+    .type _PR_x86_64_AtomicDecrement, @function
+    .align 4
+_PR_x86_64_AtomicDecrement:
+    movl $-1, %eax
+    lock
+    xaddl %eax, (%rdi)
+    decl %eax
+    ret
+    .size _PR_x86_64_AtomicDecrement, .-_PR_x86_64_AtomicDecrement
+
+// PRInt32 _PR_x86_64_AtomicSet(PRInt32 *val, PRInt32 newval)
+//
+// Atomically set the integer pointed to by 'val' to the new
+// value 'newval' and return the old value.
+//
+    .text
+    .globl _PR_x86_64_AtomicSet
+    .type _PR_x86_64_AtomicSet, @function
+    .align 4
+_PR_x86_64_AtomicSet:
+    movl %esi, %eax
+    xchgl %eax, (%rdi)
+    ret
+    .size _PR_x86_64_AtomicSet, .-_PR_x86_64_AtomicSet
+
+// PRInt32 _PR_x86_64_AtomicAdd(PRInt32 *ptr, PRInt32 val)
+//
+// Atomically add 'val' to the integer pointed to by 'ptr'
+// and return the result of the addition.
+//
+    .text
+    .globl _PR_x86_64_AtomicAdd
+    .type _PR_x86_64_AtomicAdd, @function
+    .align 4
+_PR_x86_64_AtomicAdd:
+    movl %esi, %eax
+    lock
+    xaddl %eax, (%rdi)
+    addl %esi, %eax
+    ret
+    .size _PR_x86_64_AtomicAdd, .-_PR_x86_64_AtomicAdd
+
+// Magic indicating no need for an executable stack
+.section .note.GNU-stack, "", @progbits ; .previous
diff --git a/nsprpub/pr/src/md/unix/os_SunOS_sparcv9.s b/nsprpub/pr/src/md/unix/os_SunOS_sparcv9.s
new file mode 100644
index 000000000..8bc75af88
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_SunOS_sparcv9.s
@@ -0,0 +1,173 @@
+! -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+! 
+! This Source Code Form is subject to the terms of the Mozilla Public
+! License, v. 2.0. If a copy of the MPL was not distributed with this
+! file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+!
+!  atomic increment, decrement and swap routines for V8+ sparc (ultrasparc)
+!  using CAS (compare-and-swap) atomic instructions
+!
+!  this MUST be compiled with an ultrasparc-aware assembler
+!
+!  standard asm linkage macros; this module must be compiled
+!  with the -P option (use C preprocessor)
+
+#include <sys/asm_linkage.h>
+
+!  ======================================================================
+!
+!  Perform the sequence a = a + 1 atomically with respect to other
+!  fetch-and-adds to location a in a wait-free fashion.
+!
+!  usage : val = PR_AtomicIncrement(address)
+!  return: current value (you'd think this would be old val)
+!
+!  -----------------------
+!  Note on REGISTER USAGE:
+!  as this is a LEAF procedure, a new stack frame is not created;
+!  we use the caller's stack frame so what would normally be %i (input)
+!  registers are actually %o (output registers).  Also, we must not
+!  overwrite the contents of %l (local) registers as they are not
+!  assumed to be volatile during calls.
+!
+!  So, the registers used are:
+!     %o0  [input]   - the address of the value to increment
+!     %o1  [local]   - work register
+!     %o2  [local]   - work register
+!     %o3  [local]   - work register
+!  -----------------------
+
+        ENTRY(_MD_AtomicIncrement)      ! standard assembler/ELF prologue
+
+retryAI:
+        ld      [%o0], %o2              ! set o2 to the current value
+        add     %o2, 0x1, %o3           ! calc the new value
+        mov     %o3, %o1                ! save the return value
+        cas     [%o0], %o2, %o3         ! atomically set if o0 hasn't changed
+        cmp     %o2, %o3                ! see if we set the value
+        bne     retryAI                 ! if not, try again
+        nop                             ! empty out the branch pipeline
+        retl                            ! return back to the caller
+        mov     %o1, %o0                ! set the return code to the new value
+
+        SET_SIZE(_MD_AtomicIncrement)   ! standard assembler/ELF epilogue
+
+!
+!  end
+!
+!  ======================================================================
+!
+
+!  ======================================================================
+!
+!  Perform the sequence a = a - 1 atomically with respect to other
+!  fetch-and-decs to location a in a wait-free fashion.
+!
+!  usage : val = PR_AtomicDecrement(address)
+!  return: current value (you'd think this would be old val)
+!
+!  -----------------------
+!  Note on REGISTER USAGE:
+!  as this is a LEAF procedure, a new stack frame is not created;
+!  we use the caller's stack frame so what would normally be %i (input)
+!  registers are actually %o (output registers).  Also, we must not
+!  overwrite the contents of %l (local) registers as they are not
+!  assumed to be volatile during calls.
+!
+!  So, the registers used are:
+!     %o0  [input]   - the address of the value to increment
+!     %o1  [local]   - work register
+!     %o2  [local]   - work register
+!     %o3  [local]   - work register
+!  -----------------------
+
+        ENTRY(_MD_AtomicDecrement)      ! standard assembler/ELF prologue
+
+retryAD:
+        ld      [%o0], %o2              ! set o2 to the current value
+        sub     %o2, 0x1, %o3           ! calc the new value
+        mov     %o3, %o1                ! save the return value
+        cas     [%o0], %o2, %o3         ! atomically set if o0 hasn't changed
+        cmp     %o2, %o3                ! see if we set the value
+        bne     retryAD                 ! if not, try again
+        nop                             ! empty out the branch pipeline
+        retl                            ! return back to the caller
+        mov     %o1, %o0                ! set the return code to the new value
+
+        SET_SIZE(_MD_AtomicDecrement)   ! standard assembler/ELF epilogue
+
+!
+!  end
+!
+!  ======================================================================
+!
+
+!  ======================================================================
+!
+!  Perform the sequence a = b atomically with respect to other
+!  fetch-and-stores to location a in a wait-free fashion.
+!
+!  usage : old_val = PR_AtomicSet(address, newval)
+!
+!  -----------------------
+!  Note on REGISTER USAGE:
+!  as this is a LEAF procedure, a new stack frame is not created;
+!  we use the caller's stack frame so what would normally be %i (input)
+!  registers are actually %o (output registers).  Also, we must not
+!  overwrite the contents of %l (local) registers as they are not
+!  assumed to be volatile during calls.
+!
+!  So, the registers used are:
+!     %o0  [input]   - the address of the value to increment
+!     %o1  [input]   - the new value to set for [%o0]
+!     %o2  [local]   - work register
+!     %o3  [local]   - work register
+!  -----------------------
+
+        ENTRY(_MD_AtomicSet)            ! standard assembler/ELF prologue
+
+retryAS:
+        ld      [%o0], %o2              ! set o2 to the current value
+        mov     %o1, %o3                ! set up the new value
+        cas     [%o0], %o2, %o3         ! atomically set if o0 hasn't changed
+        cmp     %o2, %o3                ! see if we set the value
+        bne     retryAS                 ! if not, try again
+        nop                             ! empty out the branch pipeline
+        retl                            ! return back to the caller
+        mov     %o3, %o0                ! set the return code to the prev value
+
+        SET_SIZE(_MD_AtomicSet)         ! standard assembler/ELF epilogue
+
+!
+!  end
+!
+!  ======================================================================
+!
+
+!  ======================================================================
+!
+!  Perform the sequence a = a + b atomically with respect to other
+!  fetch-and-adds to location a in a wait-free fashion.
+!
+!  usage : newval = PR_AtomicAdd(address, val)
+!  return: the value after addition
+!
+        ENTRY(_MD_AtomicAdd)      ! standard assembler/ELF prologue
+
+retryAA:
+        ld      [%o0], %o2              ! set o2 to the current value
+        add     %o2, %o1, %o3           ! calc the new value
+        mov     %o3, %o4                ! save the return value
+        cas     [%o0], %o2, %o3         ! atomically set if o0 hasn't changed
+        cmp     %o2, %o3                ! see if we set the value
+        bne     retryAA                 ! if not, try again
+        nop                             ! empty out the branch pipeline
+        retl                            ! return back to the caller
+        mov     %o4, %o0                ! set the return code to the new value
+
+        SET_SIZE(_MD_AtomicAdd)    		! standard assembler/ELF epilogue
+
+!
+!  end
+!
diff --git a/nsprpub/pr/src/md/unix/os_SunOS_ultrasparc.s b/nsprpub/pr/src/md/unix/os_SunOS_ultrasparc.s
new file mode 100644
index 000000000..32bf7884a
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_SunOS_ultrasparc.s
@@ -0,0 +1,173 @@
+! -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+! 
+! This Source Code Form is subject to the terms of the Mozilla Public
+! License, v. 2.0. If a copy of the MPL was not distributed with this
+! file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+!
+!  atomic increment, decrement and swap routines for V8+ sparc (ultrasparc)
+!  using CAS (compare-and-swap) atomic instructions
+!
+!  this MUST be compiled with an ultrasparc-aware assembler
+!
+!  standard asm linkage macros; this module must be compiled
+!  with the -P option (use C preprocessor)
+
+#include <sys/asm_linkage.h>
+
+!  ======================================================================
+!
+!  Perform the sequence a = a + 1 atomically with respect to other
+!  fetch-and-adds to location a in a wait-free fashion.
+!
+!  usage : val = PR_AtomicIncrement(address)
+!  return: current value (you'd think this would be old val)
+!
+!  -----------------------
+!  Note on REGISTER USAGE:
+!  as this is a LEAF procedure, a new stack frame is not created;
+!  we use the caller's stack frame so what would normally be %i (input)
+!  registers are actually %o (output registers).  Also, we must not
+!  overwrite the contents of %l (local) registers as they are not
+!  assumed to be volatile during calls.
+!
+!  So, the registers used are:
+!     %o0  [input]   - the address of the value to increment
+!     %o1  [local]   - work register
+!     %o2  [local]   - work register
+!     %o3  [local]   - work register
+!  -----------------------
+
+        ENTRY(PR_AtomicIncrement)       ! standard assembler/ELF prologue
+
+retryAI:
+        ld      [%o0], %o2              ! set o2 to the current value
+        add     %o2, 0x1, %o3           ! calc the new value
+        mov     %o3, %o1                ! save the return value
+        cas     [%o0], %o2, %o3         ! atomically set if o0 hasn't changed
+        cmp     %o2, %o3                ! see if we set the value
+        bne     retryAI                 ! if not, try again
+        nop                             ! empty out the branch pipeline
+        retl                            ! return back to the caller
+        mov     %o1, %o0                ! set the return code to the new value
+
+        SET_SIZE(PR_AtomicIncrement)    ! standard assembler/ELF epilogue
+
+!
+!  end
+!
+!  ======================================================================
+!
+
+!  ======================================================================
+!
+!  Perform the sequence a = a - 1 atomically with respect to other
+!  fetch-and-decs to location a in a wait-free fashion.
+!
+!  usage : val = PR_AtomicDecrement(address)
+!  return: current value (you'd think this would be old val)
+!
+!  -----------------------
+!  Note on REGISTER USAGE:
+!  as this is a LEAF procedure, a new stack frame is not created;
+!  we use the caller's stack frame so what would normally be %i (input)
+!  registers are actually %o (output registers).  Also, we must not
+!  overwrite the contents of %l (local) registers as they are not
+!  assumed to be volatile during calls.
+!
+!  So, the registers used are:
+!     %o0  [input]   - the address of the value to increment
+!     %o1  [local]   - work register
+!     %o2  [local]   - work register
+!     %o3  [local]   - work register
+!  -----------------------
+
+        ENTRY(PR_AtomicDecrement)       ! standard assembler/ELF prologue
+
+retryAD:
+        ld      [%o0], %o2              ! set o2 to the current value
+        sub     %o2, 0x1, %o3           ! calc the new value
+        mov     %o3, %o1                ! save the return value
+        cas     [%o0], %o2, %o3         ! atomically set if o0 hasn't changed
+        cmp     %o2, %o3                ! see if we set the value
+        bne     retryAD                 ! if not, try again
+        nop                             ! empty out the branch pipeline
+        retl                            ! return back to the caller
+        mov     %o1, %o0                ! set the return code to the new value
+
+        SET_SIZE(PR_AtomicDecrement)    ! standard assembler/ELF epilogue
+
+!
+!  end
+!
+!  ======================================================================
+!
+
+!  ======================================================================
+!
+!  Perform the sequence a = b atomically with respect to other
+!  fetch-and-stores to location a in a wait-free fashion.
+!
+!  usage : old_val = PR_AtomicSet(address, newval)
+!
+!  -----------------------
+!  Note on REGISTER USAGE:
+!  as this is a LEAF procedure, a new stack frame is not created;
+!  we use the caller's stack frame so what would normally be %i (input)
+!  registers are actually %o (output registers).  Also, we must not
+!  overwrite the contents of %l (local) registers as they are not
+!  assumed to be volatile during calls.
+!
+!  So, the registers used are:
+!     %o0  [input]   - the address of the value to increment
+!     %o1  [input]   - the new value to set for [%o0]
+!     %o2  [local]   - work register
+!     %o3  [local]   - work register
+!  -----------------------
+
+        ENTRY(PR_AtomicSet)             ! standard assembler/ELF prologue
+
+retryAS:
+        ld      [%o0], %o2              ! set o2 to the current value
+        mov     %o1, %o3                ! set up the new value
+        cas     [%o0], %o2, %o3         ! atomically set if o0 hasn't changed
+        cmp     %o2, %o3                ! see if we set the value
+        bne     retryAS                 ! if not, try again
+        nop                             ! empty out the branch pipeline
+        retl                            ! return back to the caller
+        mov     %o3, %o0                ! set the return code to the prev value
+
+        SET_SIZE(PR_AtomicSet)          ! standard assembler/ELF epilogue
+
+!
+!  end
+!
+!  ======================================================================
+!
+
+!  ======================================================================
+!
+!  Perform the sequence a = a + b atomically with respect to other
+!  fetch-and-adds to location a in a wait-free fashion.
+!
+!  usage : newval = PR_AtomicAdd(address, val)
+!  return: the value after addition
+!
+        ENTRY(PR_AtomicAdd)       ! standard assembler/ELF prologue
+
+retryAA:
+        ld      [%o0], %o2              ! set o2 to the current value
+        add     %o2, %o1, %o3           ! calc the new value
+        mov     %o3, %o4                ! save the return value
+        cas     [%o0], %o2, %o3         ! atomically set if o0 hasn't changed
+        cmp     %o2, %o3                ! see if we set the value
+        bne     retryAA                 ! if not, try again
+        nop                             ! empty out the branch pipeline
+        retl                            ! return back to the caller
+        mov     %o4, %o0                ! set the return code to the new value
+
+        SET_SIZE(PR_AtomicAdd)    		! standard assembler/ELF epilogue
+
+!
+!  end
+!
diff --git a/nsprpub/pr/src/md/unix/os_SunOS_x86.s b/nsprpub/pr/src/md/unix/os_SunOS_x86.s
new file mode 100644
index 000000000..dcd7535bf
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_SunOS_x86.s
@@ -0,0 +1,126 @@
+// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+// 
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+	.text
+
+	.globl	getedi
+getedi:
+	movl	%edi,%eax
+	ret
+	.type	getedi,@function
+	.size	getedi,.-getedi
+ 
+	.globl	setedi
+setedi:
+	movl	4(%esp),%edi
+	ret
+	.type	setedi,@function
+	.size	setedi,.-setedi
+
+	.globl	__MD_FlushRegisterWindows
+	.globl _MD_FlushRegisterWindows
+
+__MD_FlushRegisterWindows:
+_MD_FlushRegisterWindows:
+
+	ret
+
+//
+// sol_getsp()
+//
+// Return the current sp (for debugging)
+//
+	.globl sol_getsp
+sol_getsp:
+	movl	%esp, %eax
+	ret
+
+//
+// sol_curthread()
+//
+// Return a unique identifier for the currently active thread.
+//
+	.globl sol_curthread
+sol_curthread:
+	movl	%ecx, %eax
+	ret
+
+// PRInt32 _MD_AtomicIncrement(PRInt32 *val)
+//
+// Atomically increment the integer pointed to by 'val' and return
+// the result of the increment.
+//
+    .text
+    .globl _MD_AtomicIncrement
+    .align 4
+_MD_AtomicIncrement:
+    movl 4(%esp), %ecx
+    movl $1, %eax
+    lock
+    xaddl %eax, (%ecx)
+    incl %eax
+    ret
+
+// PRInt32 _MD_AtomicDecrement(PRInt32 *val)
+//
+// Atomically decrement the integer pointed to by 'val' and return
+// the result of the decrement.
+//
+    .text
+    .globl _MD_AtomicDecrement
+    .align 4
+_MD_AtomicDecrement:
+    movl 4(%esp), %ecx
+    movl $-1, %eax
+    lock
+    xaddl %eax, (%ecx)
+    decl %eax
+    ret
+
+// PRInt32 _MD_AtomicSet(PRInt32 *val, PRInt32 newval)
+//
+// Atomically set the integer pointed to by 'val' to the new
+// value 'newval' and return the old value.
+//
+// An alternative implementation:
+//   .text
+//   .globl _MD_AtomicSet
+//   .align 4
+//_MD_AtomicSet:
+//   movl 4(%esp), %ecx
+//   movl 8(%esp), %edx
+//   movl (%ecx), %eax
+//retry:
+//   lock
+//   cmpxchgl %edx, (%ecx)
+//   jne retry
+//   ret
+//
+    .text
+    .globl _MD_AtomicSet
+    .align 4
+_MD_AtomicSet:
+    movl 4(%esp), %ecx
+    movl 8(%esp), %eax
+    xchgl %eax, (%ecx)
+    ret
+
+// PRInt32 _MD_AtomicAdd(PRInt32 *ptr, PRInt32 val)
+//
+// Atomically add 'val' to the integer pointed to by 'ptr'
+// and return the result of the addition.
+//
+    .text
+    .globl _MD_AtomicAdd
+    .align 4
+_MD_AtomicAdd:
+    movl 4(%esp), %ecx
+    movl 8(%esp), %eax
+    movl %eax, %edx
+    lock
+    xaddl %eax, (%ecx)
+    addl %edx, %eax
+    ret
diff --git a/nsprpub/pr/src/md/unix/os_SunOS_x86_64.s b/nsprpub/pr/src/md/unix/os_SunOS_x86_64.s
new file mode 100644
index 000000000..5e3df049f
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/os_SunOS_x86_64.s
@@ -0,0 +1,63 @@
+// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+// 
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// PRInt32 _MD_AtomicIncrement(PRInt32 *val)
+//
+// Atomically increment the integer pointed to by 'val' and return
+// the result of the increment.
+//
+    .text
+    .globl _MD_AtomicIncrement
+    .align 4
+_MD_AtomicIncrement:
+    movl $1, %eax
+    lock
+    xaddl %eax, (%rdi)
+    incl %eax
+    ret
+
+// PRInt32 _MD_AtomicDecrement(PRInt32 *val)
+//
+// Atomically decrement the integer pointed to by 'val' and return
+// the result of the decrement.
+//
+    .text
+    .globl _MD_AtomicDecrement
+    .align 4
+_MD_AtomicDecrement:
+    movl $-1, %eax
+    lock
+    xaddl %eax, (%rdi)
+    decl %eax
+    ret
+
+// PRInt32 _MD_AtomicSet(PRInt32 *val, PRInt32 newval)
+//
+// Atomically set the integer pointed to by 'val' to the new
+// value 'newval' and return the old value.
+//
+    .text
+    .globl _MD_AtomicSet
+    .align 4
+_MD_AtomicSet:
+    movl %esi, %eax
+    xchgl %eax, (%rdi)
+    ret
+
+// PRInt32 _MD_AtomicAdd(PRInt32 *ptr, PRInt32 val)
+//
+// Atomically add 'val' to the integer pointed to by 'ptr'
+// and return the result of the addition.
+//
+    .text
+    .globl _MD_AtomicAdd
+    .align 4
+_MD_AtomicAdd:
+    movl %esi, %eax
+    lock
+    xaddl %eax, (%rdi)
+    addl %esi, %eax
+    ret
diff --git a/nsprpub/pr/src/md/unix/osf1.c b/nsprpub/pr/src/md/unix/osf1.c
new file mode 100644
index 000000000..a9a1c67d0
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/osf1.c
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+void _MD_EarlyInit(void)
+{
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+#ifndef _PR_PTHREADS
+    if (isCurrent) {
+	(void) setjmp(CONTEXT(t));
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+#else
+	*np = 0;
+	return NULL;
+#endif
+}
+
+#ifndef _PR_PTHREADS
+void
+_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
+{
+    return;
+}
+
+PRStatus
+_MD_InitializeThread(PRThread *thread)
+{
+	return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread) {
+	PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    }
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for OSF1 */
+void
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for OSF1.");
+}
+
+PRStatus
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for OSF1.");
+	return PR_FAILURE;
+}
+#endif /* ! _PR_PTHREADS */
diff --git a/nsprpub/pr/src/md/unix/pthreads_user.c b/nsprpub/pr/src/md/unix/pthreads_user.c
new file mode 100644
index 000000000..bb64b9f44
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/pthreads_user.c
@@ -0,0 +1,448 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+#include <sys/types.h>
+#include <unistd.h>
+#include <signal.h>
+#include <pthread.h>
+
+
+sigset_t ints_off;
+pthread_mutex_t	_pr_heapLock;
+pthread_key_t current_thread_key;
+pthread_key_t current_cpu_key;
+pthread_key_t last_thread_key;
+pthread_key_t intsoff_key;
+
+
+PRInt32 _pr_md_pthreads_created, _pr_md_pthreads_failed;
+PRInt32 _pr_md_pthreads = 1;
+
+void _MD_EarlyInit(void)
+{
+extern PRInt32 _nspr_noclock;
+
+	if (pthread_key_create(&current_thread_key, NULL) != 0) {
+		perror("pthread_key_create failed");
+		exit(1);
+	}
+	if (pthread_key_create(&current_cpu_key, NULL) != 0) {
+		perror("pthread_key_create failed");
+		exit(1);
+	}
+	if (pthread_key_create(&last_thread_key, NULL) != 0) {
+		perror("pthread_key_create failed");
+		exit(1);
+	}
+	if (pthread_key_create(&intsoff_key, NULL) != 0) {
+		perror("pthread_key_create failed");
+		exit(1);
+	}
+
+	sigemptyset(&ints_off);
+	sigaddset(&ints_off, SIGALRM);
+	sigaddset(&ints_off, SIGIO);
+	sigaddset(&ints_off, SIGCLD);
+
+	/*
+	 * disable clock interrupts
+	 */
+	_nspr_noclock = 1;
+
+}
+
+void _MD_InitLocks()
+{
+	if (pthread_mutex_init(&_pr_heapLock, NULL) != 0) {
+		perror("pthread_mutex_init failed");
+		exit(1);
+	}
+}
+
+PR_IMPLEMENT(void) _MD_FREE_LOCK(struct _MDLock *lockp)
+{
+	PRIntn _is;
+	PRThread *me = _PR_MD_CURRENT_THREAD();
+
+	if (me && !_PR_IS_NATIVE_THREAD(me))
+		_PR_INTSOFF(_is); 
+	pthread_mutex_destroy(&lockp->mutex);
+	if (me && !_PR_IS_NATIVE_THREAD(me))
+		_PR_FAST_INTSON(_is);
+}
+
+
+
+PR_IMPLEMENT(PRStatus) _MD_NEW_LOCK(struct _MDLock *lockp)
+{
+    PRStatus rv;
+    PRIntn is;
+    PRThread *me = _PR_MD_CURRENT_THREAD();	
+
+	if (me && !_PR_IS_NATIVE_THREAD(me))
+		_PR_INTSOFF(is);
+	rv = pthread_mutex_init(&lockp->mutex, NULL);
+	if (me && !_PR_IS_NATIVE_THREAD(me))
+		_PR_FAST_INTSON(is);
+	return (rv == 0) ? PR_SUCCESS : PR_FAILURE;
+}
+
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+    if (isCurrent) {
+	(void) setjmp(CONTEXT(t));
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+}
+
+PR_IMPLEMENT(void)
+_MD_SetPriority(_MDThread *thread, PRThreadPriority newPri)
+{
+	/*
+	 * XXX - to be implemented
+	 */
+    return;
+}
+
+PR_IMPLEMENT(PRStatus) _MD_InitThread(struct PRThread *thread)
+{
+    struct sigaction sigact;
+
+    if (thread->flags & _PR_GLOBAL_SCOPE) {
+        thread->md.pthread = pthread_self();
+#if 0
+		/*
+		 * set up SIGUSR1 handler; this is used to save state
+		 * during PR_SuspendAll
+		 */
+		sigact.sa_handler = save_context_and_block;
+		sigact.sa_flags = SA_RESTART;
+		/*
+		 * Must mask clock interrupts
+		 */
+		sigact.sa_mask = timer_set;
+		sigaction(SIGUSR1, &sigact, 0);
+#endif
+    }
+
+    return PR_SUCCESS;
+}
+
+PR_IMPLEMENT(void) _MD_ExitThread(struct PRThread *thread)
+{
+    if (thread->flags & _PR_GLOBAL_SCOPE) {
+        _MD_CLEAN_THREAD(thread);
+        _MD_SET_CURRENT_THREAD(NULL);
+    }
+}
+
+PR_IMPLEMENT(void) _MD_CleanThread(struct PRThread *thread)
+{
+    if (thread->flags & _PR_GLOBAL_SCOPE) {
+		pthread_mutex_destroy(&thread->md.pthread_mutex);
+		pthread_cond_destroy(&thread->md.pthread_cond);
+    }
+}
+
+PR_IMPLEMENT(void) _MD_SuspendThread(struct PRThread *thread)
+{
+    PRInt32 rv;
+
+    PR_ASSERT((thread->flags & _PR_GLOBAL_SCOPE) &&
+        _PR_IS_GCABLE_THREAD(thread));
+#if 0
+	thread->md.suspending_id = getpid();
+	rv = kill(thread->md.id, SIGUSR1);
+	PR_ASSERT(rv == 0);
+	/*
+	 * now, block the current thread/cpu until woken up by the suspended
+	 * thread from it's SIGUSR1 signal handler
+	 */
+	blockproc(getpid());
+#endif
+}
+
+PR_IMPLEMENT(void) _MD_ResumeThread(struct PRThread *thread)
+{
+    PRInt32 rv;
+
+    PR_ASSERT((thread->flags & _PR_GLOBAL_SCOPE) &&
+        _PR_IS_GCABLE_THREAD(thread));
+#if 0
+    rv = unblockproc(thread->md.id);
+#endif
+}
+
+PR_IMPLEMENT(void) _MD_SuspendCPU(struct _PRCPU *thread)
+{
+    PRInt32 rv;
+
+#if 0
+	cpu->md.suspending_id = getpid();
+	rv = kill(cpu->md.id, SIGUSR1);
+	PR_ASSERT(rv == 0);
+	/*
+	 * now, block the current thread/cpu until woken up by the suspended
+	 * thread from it's SIGUSR1 signal handler
+	 */
+	blockproc(getpid());
+#endif
+}
+
+PR_IMPLEMENT(void) _MD_ResumeCPU(struct _PRCPU *thread)
+{
+#if 0
+	unblockproc(cpu->md.id);
+#endif
+}
+
+
+#define PT_NANOPERMICRO 1000UL
+#define PT_BILLION 1000000000UL
+
+PR_IMPLEMENT(PRStatus)
+_pt_wait(PRThread *thread, PRIntervalTime timeout)
+{
+int rv;
+struct timeval now;
+struct timespec tmo;
+PRUint32 ticks = PR_TicksPerSecond();
+
+
+	if (timeout != PR_INTERVAL_NO_TIMEOUT) {
+		tmo.tv_sec = timeout / ticks;
+		tmo.tv_nsec = timeout - (tmo.tv_sec * ticks);
+		tmo.tv_nsec = PR_IntervalToMicroseconds(PT_NANOPERMICRO *
+											tmo.tv_nsec);
+
+		/* pthreads wants this in absolute time, off we go ... */
+		(void)GETTIMEOFDAY(&now);
+		/* that one's usecs, this one's nsecs - grrrr! */
+		tmo.tv_sec += now.tv_sec;
+		tmo.tv_nsec += (PT_NANOPERMICRO * now.tv_usec);
+		tmo.tv_sec += tmo.tv_nsec / PT_BILLION;
+		tmo.tv_nsec %= PT_BILLION;
+	}
+
+	pthread_mutex_lock(&thread->md.pthread_mutex);
+	thread->md.wait--;
+	if (thread->md.wait < 0) {
+		if (timeout != PR_INTERVAL_NO_TIMEOUT) {
+			rv = pthread_cond_timedwait(&thread->md.pthread_cond,
+					&thread->md.pthread_mutex, &tmo);
+        }
+		else
+			rv = pthread_cond_wait(&thread->md.pthread_cond,
+					&thread->md.pthread_mutex);
+		if (rv != 0) {
+			thread->md.wait++;
+		}
+	} else
+		rv = 0;
+	pthread_mutex_unlock(&thread->md.pthread_mutex);
+
+	return (rv == 0) ? PR_SUCCESS : PR_FAILURE;
+}
+
+PR_IMPLEMENT(PRStatus)
+_MD_wait(PRThread *thread, PRIntervalTime ticks)
+{
+    if ( thread->flags & _PR_GLOBAL_SCOPE ) {
+		_MD_CHECK_FOR_EXIT();
+        if (_pt_wait(thread, ticks) == PR_FAILURE) {
+	    	_MD_CHECK_FOR_EXIT();
+            /*
+             * wait timed out
+             */
+            _PR_THREAD_LOCK(thread);
+            if (thread->wait.cvar) {
+                /*
+                 * The thread will remove itself from the waitQ
+                 * of the cvar in _PR_WaitCondVar
+                 */
+                thread->wait.cvar = NULL;
+                thread->state =  _PR_RUNNING;
+                _PR_THREAD_UNLOCK(thread);
+            }  else {
+        		_pt_wait(thread, PR_INTERVAL_NO_TIMEOUT);
+                _PR_THREAD_UNLOCK(thread);
+            }
+        }
+    } else {
+		_PR_MD_SWITCH_CONTEXT(thread);
+    }
+    return PR_SUCCESS;
+}
+
+PR_IMPLEMENT(PRStatus)
+_MD_WakeupWaiter(PRThread *thread)
+{
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    PRInt32 pid, rv;
+    PRIntn is;
+
+	PR_ASSERT(_pr_md_idle_cpus >= 0);
+    if (thread == NULL) {
+		if (_pr_md_idle_cpus)
+        	_MD_Wakeup_CPUs();
+    } else if (!_PR_IS_NATIVE_THREAD(thread)) {
+		/*
+		 * If the thread is on my cpu's runq there is no need to
+		 * wakeup any cpus
+		 */
+		if (!_PR_IS_NATIVE_THREAD(me)) {
+			if (me->cpu != thread->cpu) {
+				if (_pr_md_idle_cpus)
+        			_MD_Wakeup_CPUs();
+			}
+		} else {
+			if (_pr_md_idle_cpus)
+        		_MD_Wakeup_CPUs();
+		}
+    } else {
+		PR_ASSERT(_PR_IS_NATIVE_THREAD(thread));
+		if (!_PR_IS_NATIVE_THREAD(me))
+			_PR_INTSOFF(is);
+
+		pthread_mutex_lock(&thread->md.pthread_mutex);
+		thread->md.wait++;
+		rv = pthread_cond_signal(&thread->md.pthread_cond);
+		PR_ASSERT(rv == 0);
+		pthread_mutex_unlock(&thread->md.pthread_mutex);
+
+		if (!_PR_IS_NATIVE_THREAD(me))
+			_PR_FAST_INTSON(is);
+    } 
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for AIX */
+PR_IMPLEMENT(void)
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for AIX.");
+}
+
+PR_IMPLEMENT(PRStatus)
+_MD_CreateThread(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PRIntn is;
+    int rv;
+	PRThread *me = _PR_MD_CURRENT_THREAD();	
+	pthread_attr_t attr;
+
+	if (!_PR_IS_NATIVE_THREAD(me))
+		_PR_INTSOFF(is);
+
+	if (pthread_mutex_init(&thread->md.pthread_mutex, NULL) != 0) {
+		if (!_PR_IS_NATIVE_THREAD(me))
+			_PR_FAST_INTSON(is);
+        return PR_FAILURE;
+	}
+
+	if (pthread_cond_init(&thread->md.pthread_cond, NULL) != 0) {
+		pthread_mutex_destroy(&thread->md.pthread_mutex);
+		if (!_PR_IS_NATIVE_THREAD(me))
+			_PR_FAST_INTSON(is);
+        return PR_FAILURE;
+	}
+    thread->flags |= _PR_GLOBAL_SCOPE;
+
+	pthread_attr_init(&attr); /* initialize attr with default attributes */
+	if (pthread_attr_setstacksize(&attr, (size_t) stackSize) != 0) {
+		pthread_mutex_destroy(&thread->md.pthread_mutex);
+		pthread_cond_destroy(&thread->md.pthread_cond);
+		pthread_attr_destroy(&attr);
+		if (!_PR_IS_NATIVE_THREAD(me))
+			_PR_FAST_INTSON(is);
+        return PR_FAILURE;
+	}
+
+	thread->md.wait = 0;
+    rv = pthread_create(&thread->md.pthread, &attr, start, (void *)thread);
+    if (0 == rv) {
+        _MD_ATOMIC_INCREMENT(&_pr_md_pthreads_created);
+        _MD_ATOMIC_INCREMENT(&_pr_md_pthreads);
+		if (!_PR_IS_NATIVE_THREAD(me))
+			_PR_FAST_INTSON(is);
+        return PR_SUCCESS;
+    } else {
+		pthread_mutex_destroy(&thread->md.pthread_mutex);
+		pthread_cond_destroy(&thread->md.pthread_cond);
+		pthread_attr_destroy(&attr);
+        _MD_ATOMIC_INCREMENT(&_pr_md_pthreads_failed);
+		if (!_PR_IS_NATIVE_THREAD(me))
+			_PR_FAST_INTSON(is);
+        PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, rv);
+        return PR_FAILURE;
+    }
+}
+
+PR_IMPLEMENT(void)
+_MD_InitRunningCPU(struct _PRCPU *cpu)
+{
+    extern int _pr_md_pipefd[2];
+
+    _MD_unix_init_running_cpu(cpu);
+    cpu->md.pthread = pthread_self();
+	if (_pr_md_pipefd[0] >= 0) {
+    	_PR_IOQ_MAX_OSFD(cpu) = _pr_md_pipefd[0];
+#ifndef _PR_USE_POLL
+    	FD_SET(_pr_md_pipefd[0], &_PR_FD_READ_SET(cpu));
+#endif
+	}
+}
+
+
+void
+_MD_CleanupBeforeExit(void)
+{
+#if 0
+    extern PRInt32    _pr_cpus_exit;
+
+	_pr_irix_exit_now = 1;
+    if (_pr_numCPU > 1) {
+        /*
+         * Set a global flag, and wakeup all cpus which will notice the flag
+         * and exit.
+         */
+        _pr_cpus_exit = getpid();
+        _MD_Wakeup_CPUs();
+        while(_pr_numCPU > 1) {
+            _PR_WAIT_SEM(_pr_irix_exit_sem);
+            _pr_numCPU--;
+        }
+    }
+    /*
+     * cause global threads on the recycle list to exit
+     */
+     _PR_DEADQ_LOCK;
+     if (_PR_NUM_DEADNATIVE != 0) {
+	PRThread *thread;
+    	PRCList *ptr;
+
+        ptr = _PR_DEADNATIVEQ.next;
+        while( ptr != &_PR_DEADNATIVEQ ) {
+        	thread = _PR_THREAD_PTR(ptr);
+		_MD_CVAR_POST_SEM(thread);
+                ptr = ptr->next;
+        } 
+     }
+     _PR_DEADQ_UNLOCK;
+     while(_PR_NUM_DEADNATIVE > 1) {
+	_PR_WAIT_SEM(_pr_irix_exit_sem);
+	_PR_DEC_DEADNATIVE;
+     }
+#endif
+}
diff --git a/nsprpub/pr/src/md/unix/qnx.c b/nsprpub/pr/src/md/unix/qnx.c
new file mode 100644
index 000000000..259e29cdc
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/qnx.c
@@ -0,0 +1,70 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+#include <setjmp.h>
+
+void _MD_EarlyInit(void)
+{
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+    if (isCurrent) {
+	(void) setjmp(CONTEXT(t));
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+}
+
+void
+_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
+{
+    return;
+}
+
+PRStatus
+_MD_InitializeThread(PRThread *thread)
+{
+	return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread) {
+	PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    }
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for Unixware */
+void
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for Unixware.");
+}
+
+PRStatus
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRUintn priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for Unixware.");
+    return PR_FAILURE;
+}
diff --git a/nsprpub/pr/src/md/unix/riscos.c b/nsprpub/pr/src/md/unix/riscos.c
new file mode 100644
index 000000000..318903acb
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/riscos.c
@@ -0,0 +1,88 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+void _MD_EarlyInit(void)
+{
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+#ifndef _PR_PTHREADS
+    if (isCurrent) {
+	(void) setjmp(CONTEXT(t));
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+#else
+	*np = 0;
+	return NULL;
+#endif
+}
+
+#ifdef _PR_PTHREADS
+
+void _MD_CleanupBeforeExit(void)
+{
+}
+
+#else /* ! _PR_PTHREADS */
+
+void
+_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
+{
+    return;
+}
+
+PRStatus
+_MD_InitializeThread(PRThread *thread)
+{
+	/*
+	 * set the pointers to the stack-pointer and frame-pointer words in the
+	 * context structure; this is for debugging use.
+	 */
+	thread->md.sp = _MD_GET_SP_PTR(thread);
+	thread->md.fp = _MD_GET_FP_PTR(thread);
+	return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread) {
+	PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    }
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for RISC OS */
+void
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for RISC OS.");
+}
+
+PRStatus
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for RISC OS.");
+	return PR_FAILURE;
+}
+#endif /* ! _PR_PTHREADS */
diff --git a/nsprpub/pr/src/md/unix/scoos.c b/nsprpub/pr/src/md/unix/scoos.c
new file mode 100644
index 000000000..b727a53ae
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/scoos.c
@@ -0,0 +1,149 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * SCO ODT 5.0 - originally created by mikep
+ */
+#include "primpl.h"
+
+#include <setjmp.h>
+
+void _MD_EarlyInit(void)
+{
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+    if (isCurrent) {
+	(void) setjmp(CONTEXT(t));
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+}
+
+#ifdef ALARMS_BREAK_TCP /* I don't think they do */
+
+PRInt32 _MD_connect(PRInt32 osfd, PRNetAddr *addr, PRInt32 addrlen,
+                        PRIntervalTime timeout)
+{
+    PRInt32 rv;
+
+    _MD_BLOCK_CLOCK_INTERRUPTS();
+    rv = _connect(osfd,addr,addrlen);
+    _MD_UNBLOCK_CLOCK_INTERRUPTS();
+}
+
+PRInt32 _MD_accept(PRInt32 osfd, PRNetAddr *addr, PRInt32 addrlen,
+                        PRIntervalTime timeout)
+{
+    PRInt32 rv;
+
+    _MD_BLOCK_CLOCK_INTERRUPTS();
+    rv = _accept(osfd,addr,addrlen);
+    _MD_UNBLOCK_CLOCK_INTERRUPTS();
+    return(rv);
+}
+#endif
+
+/*
+ * These are also implemented in pratom.c using NSPR locks.  Any reason
+ * this might be better or worse?  If you like this better, define
+ * _PR_HAVE_ATOMIC_OPS in include/md/unixware.h
+ */
+#ifdef _PR_HAVE_ATOMIC_OPS
+/* Atomic operations */
+#include  <stdio.h>
+static FILE *_uw_semf;
+
+void
+_MD_INIT_ATOMIC(void)
+{
+    /* Sigh.  Sure wish SYSV semaphores weren't such a pain to use */
+    if ((_uw_semf = tmpfile()) == NULL)
+        PR_ASSERT(0);
+
+    return;
+}
+
+void
+_MD_ATOMIC_INCREMENT(PRInt32 *val)
+{
+    flockfile(_uw_semf);
+    (*val)++;
+    unflockfile(_uw_semf);
+}
+
+void
+_MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 val)
+{
+    flockfile(_uw_semf);
+    (*ptr) += val;
+    unflockfile(_uw_semf);
+}
+
+void
+_MD_ATOMIC_DECREMENT(PRInt32 *val)
+{
+    flockfile(_uw_semf);
+    (*val)--;
+    unflockfile(_uw_semf);
+}
+
+void
+_MD_ATOMIC_SET(PRInt32 *val, PRInt32 newval)
+{
+    flockfile(_uw_semf);
+    *val = newval;
+    unflockfile(_uw_semf);
+}
+#endif
+
+void
+_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
+{
+    return;
+}
+
+PRStatus
+_MD_InitializeThread(PRThread *thread)
+{
+	return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread) {
+	PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    }
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for SCO */
+void
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for SCO.");
+}
+
+PRStatus
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for SCO.");
+}
diff --git a/nsprpub/pr/src/md/unix/solaris.c b/nsprpub/pr/src/md/unix/solaris.c
new file mode 100644
index 000000000..4fe2043b1
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/solaris.c
@@ -0,0 +1,161 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+
+extern PRBool suspendAllOn;
+extern PRThread *suspendAllThread;
+
+extern void _MD_SET_PRIORITY(_MDThread *md, PRThreadPriority newPri);
+
+PRIntervalTime _MD_Solaris_TicksPerSecond(void)
+{
+    /*
+     * Ticks have a 10-microsecond resolution.  So there are
+     * 100000 ticks per second.
+     */
+    return 100000UL;
+}
+
+/* Interval timers, implemented using gethrtime() */
+
+PRIntervalTime _MD_Solaris_GetInterval(void)
+{
+    union {
+	hrtime_t hrt;  /* hrtime_t is a 64-bit (long long) integer */
+	PRInt64 pr64;
+    } time;
+    PRInt64 resolution;
+    PRIntervalTime ticks;
+
+    time.hrt = gethrtime();  /* in nanoseconds */
+    /*
+     * Convert from nanoseconds to ticks.  A tick's resolution is
+     * 10 microseconds, or 10000 nanoseconds.
+     */
+    LL_I2L(resolution, 10000);
+    LL_DIV(time.pr64, time.pr64, resolution);
+    LL_L2UI(ticks, time.pr64);
+    return ticks;
+}
+
+#ifdef _PR_PTHREADS
+void _MD_EarlyInit(void)
+{
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, PRIntn isCurrent, PRIntn *np)
+{
+	*np = 0;
+	return NULL;
+}
+#endif /* _PR_PTHREADS */
+
+#if defined(_PR_LOCAL_THREADS_ONLY)
+
+void _MD_EarlyInit(void)
+{
+}
+
+void _MD_SolarisInit()
+{
+    _PR_UnixInit();
+}
+
+void
+_MD_SET_PRIORITY(_MDThread *thread, PRThreadPriority newPri)
+{
+    return;
+}
+
+PRStatus
+_MD_InitializeThread(PRThread *thread)
+{
+	return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+	PR_ASSERT((thread == NULL) || (!(thread->flags & _PR_GLOBAL_SCOPE)));
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for Solaris */
+void
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for Solaris");
+}
+
+PRStatus
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for Solaris");
+	return(PR_FAILURE);
+}
+
+#ifdef USE_SETJMP
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+    if (isCurrent) {
+		(void) setjmp(CONTEXT(t));
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+}
+#else
+PRWord *_MD_HomeGCRegisters(PRThread *t, PRIntn isCurrent, PRIntn *np)
+{
+    if (isCurrent) {
+		(void) getcontext(CONTEXT(t));
+    }
+    *np = NGREG;
+    return (PRWord*) &t->md.context.uc_mcontext.gregs[0];
+}
+#endif  /* USE_SETJMP */
+
+#endif  /* _PR_LOCAL_THREADS_ONLY */
+
+#ifndef _PR_PTHREADS
+#if defined(i386) && defined(SOLARIS2_4)
+/* 
+ * Because clock_gettime() on Solaris/x86 2.4 always generates a
+ * segmentation fault, we use an emulated version _pr_solx86_clock_gettime(),
+ * which is implemented using gettimeofday().
+ */
+
+int
+_pr_solx86_clock_gettime(clockid_t clock_id, struct timespec *tp)
+{
+    struct timeval tv;
+
+    if (clock_id != CLOCK_REALTIME) {
+	errno = EINVAL;
+	return -1;
+    }
+
+    gettimeofday(&tv, NULL);
+    tp->tv_sec = tv.tv_sec;
+    tp->tv_nsec = tv.tv_usec * 1000;
+    return 0;
+}
+#endif  /* i386 && SOLARIS2_4 */
+#endif  /* _PR_PTHREADS */
diff --git a/nsprpub/pr/src/md/unix/symbian.c b/nsprpub/pr/src/md/unix/symbian.c
new file mode 100644
index 000000000..c797d8687
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/symbian.c
@@ -0,0 +1,16 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+void _MD_EarlyInit(void)
+{
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+    *np = 0;
+    return NULL;
+}
diff --git a/nsprpub/pr/src/md/unix/unix.c b/nsprpub/pr/src/md/unix/unix.c
new file mode 100644
index 000000000..fdae1199c
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/unix.c
@@ -0,0 +1,3787 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+#include <string.h>
+#include <signal.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <sys/utsname.h>
+
+#ifdef _PR_POLL_AVAILABLE
+#include <poll.h>
+#endif
+
+#if defined(ANDROID)
+#include <android/api-level.h>
+#endif
+
+/* To get FIONREAD */
+#if defined(UNIXWARE)
+#include <sys/filio.h>
+#endif
+
+#if defined(NTO)
+#include <sys/statvfs.h>
+#endif
+
+/*
+ * Make sure _PRSockLen_t is 32-bit, because we will cast a PRUint32* or
+ * PRInt32* pointer to a _PRSockLen_t* pointer.
+ */
+#if defined(HAVE_SOCKLEN_T) \
+    || (defined(__GLIBC__) && __GLIBC__ >= 2)
+#define _PRSockLen_t socklen_t
+#elif defined(IRIX) || defined(HPUX) || defined(OSF1) || defined(SOLARIS) \
+    || defined(AIX4_1) || defined(LINUX) \
+    || defined(BSDI) || defined(SCO) \
+    || defined(DARWIN) \
+    || defined(QNX)
+#define _PRSockLen_t int
+#elif (defined(AIX) && !defined(AIX4_1)) || defined(FREEBSD) \
+    || defined(NETBSD) || defined(OPENBSD) || defined(UNIXWARE) \
+    || defined(DGUX) || defined(NTO) || defined(RISCOS)
+#define _PRSockLen_t size_t
+#else
+#error "Cannot determine architecture"
+#endif
+
+/*
+** Global lock variable used to bracket calls into rusty libraries that
+** aren't thread safe (like libc, libX, etc).
+*/
+static PRLock *_pr_rename_lock = NULL;
+static PRMonitor *_pr_Xfe_mon = NULL;
+
+static PRInt64 minus_one;
+
+sigset_t timer_set;
+
+#if !defined(_PR_PTHREADS)
+
+static sigset_t empty_set;
+
+#ifdef SOLARIS
+#include <sys/file.h>
+#include <sys/filio.h>
+#endif
+
+#ifndef PIPE_BUF
+#define PIPE_BUF 512
+#endif
+
+/*
+ * _nspr_noclock - if set clock interrupts are disabled
+ */
+int _nspr_noclock = 1;
+
+#ifdef IRIX
+extern PRInt32 _nspr_terminate_on_error;
+#endif
+
+/*
+ * There is an assertion in this code that NSPR's definition of PRIOVec
+ * is bit compatible with UNIX' definition of a struct iovec. This is
+ * applicable to the 'writev()' operations where the types are casually
+ * cast to avoid warnings.
+ */
+
+int _pr_md_pipefd[2] = { -1, -1 };
+static char _pr_md_pipebuf[PIPE_BUF];
+static PRInt32 local_io_wait(PRInt32 osfd, PRInt32 wait_flag,
+							PRIntervalTime timeout);
+
+_PRInterruptTable _pr_interruptTable[] = {
+    { 
+        "clock", _PR_MISSED_CLOCK, _PR_ClockInterrupt,     },
+    { 
+        0     }
+};
+
+void _MD_unix_init_running_cpu(_PRCPU *cpu)
+{
+    PR_INIT_CLIST(&(cpu->md.md_unix.ioQ));
+    cpu->md.md_unix.ioq_max_osfd = -1;
+    cpu->md.md_unix.ioq_timeout = PR_INTERVAL_NO_TIMEOUT;
+}
+
+PRStatus _MD_open_dir(_MDDir *d, const char *name)
+{
+int err;
+
+    d->d = opendir(name);
+    if (!d->d) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_OPENDIR_ERROR(err);
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}
+
+PRInt32 _MD_close_dir(_MDDir *d)
+{
+int rv = 0, err;
+
+    if (d->d) {
+        rv = closedir(d->d);
+        if (rv == -1) {
+                err = _MD_ERRNO();
+                _PR_MD_MAP_CLOSEDIR_ERROR(err);
+        }
+    }
+    return rv;
+}
+
+char * _MD_read_dir(_MDDir *d, PRIntn flags)
+{
+struct dirent *de;
+int err;
+
+    for (;;) {
+        /*
+          * XXX: readdir() is not MT-safe. There is an MT-safe version
+          * readdir_r() on some systems.
+          */
+        _MD_ERRNO() = 0;
+        de = readdir(d->d);
+        if (!de) {
+            err = _MD_ERRNO();
+            _PR_MD_MAP_READDIR_ERROR(err);
+            return 0;
+        }        
+        if ((flags & PR_SKIP_DOT) &&
+            (de->d_name[0] == '.') && (de->d_name[1] == 0))
+            continue;
+        if ((flags & PR_SKIP_DOT_DOT) &&
+            (de->d_name[0] == '.') && (de->d_name[1] == '.') &&
+            (de->d_name[2] == 0))
+            continue;
+        if ((flags & PR_SKIP_HIDDEN) && (de->d_name[0] == '.'))
+            continue;
+        break;
+    }
+    return de->d_name;
+}
+
+PRInt32 _MD_delete(const char *name)
+{
+PRInt32 rv, err;
+#ifdef UNIXWARE
+    sigset_t set, oset;
+#endif
+
+#ifdef UNIXWARE
+    sigfillset(&set);
+    sigprocmask(SIG_SETMASK, &set, &oset);
+#endif
+    rv = unlink(name);
+#ifdef UNIXWARE
+    sigprocmask(SIG_SETMASK, &oset, NULL);
+#endif
+    if (rv == -1) {
+            err = _MD_ERRNO();
+            _PR_MD_MAP_UNLINK_ERROR(err);
+    }
+    return(rv);
+}
+
+PRInt32 _MD_rename(const char *from, const char *to)
+{
+    PRInt32 rv = -1, err;
+
+    /*
+    ** This is trying to enforce the semantics of WINDOZE' rename
+    ** operation. That means one is not allowed to rename over top
+    ** of an existing file. Holding a lock across these two function
+    ** and the open function is known to be a bad idea, but ....
+    */
+    if (NULL != _pr_rename_lock)
+        PR_Lock(_pr_rename_lock);
+    if (0 == access(to, F_OK))
+        PR_SetError(PR_FILE_EXISTS_ERROR, 0);
+    else
+    {
+        rv = rename(from, to);
+        if (rv < 0) {
+            err = _MD_ERRNO();
+            _PR_MD_MAP_RENAME_ERROR(err);
+        }
+    }
+    if (NULL != _pr_rename_lock)
+        PR_Unlock(_pr_rename_lock);
+    return rv;
+}
+
+PRInt32 _MD_access(const char *name, PRAccessHow how)
+{
+PRInt32 rv, err;
+int amode;
+
+    switch (how) {
+        case PR_ACCESS_WRITE_OK:
+            amode = W_OK;
+            break;
+        case PR_ACCESS_READ_OK:
+            amode = R_OK;
+            break;
+        case PR_ACCESS_EXISTS:
+            amode = F_OK;
+            break;
+        default:
+            PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+            rv = -1;
+            goto done;
+    }
+    rv = access(name, amode);
+
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_ACCESS_ERROR(err);
+    }
+
+done:
+    return(rv);
+}
+
+PRInt32 _MD_mkdir(const char *name, PRIntn mode)
+{
+int rv, err;
+
+    /*
+    ** This lock is used to enforce rename semantics as described
+    ** in PR_Rename. Look there for more fun details.
+    */
+    if (NULL !=_pr_rename_lock)
+        PR_Lock(_pr_rename_lock);
+    rv = mkdir(name, mode);
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_MKDIR_ERROR(err);
+    }
+    if (NULL !=_pr_rename_lock)
+        PR_Unlock(_pr_rename_lock);
+    return rv;
+}
+
+PRInt32 _MD_rmdir(const char *name)
+{
+int rv, err;
+
+    rv = rmdir(name);
+    if (rv == -1) {
+            err = _MD_ERRNO();
+            _PR_MD_MAP_RMDIR_ERROR(err);
+    }
+    return rv;
+}
+
+PRInt32 _MD_read(PRFileDesc *fd, void *buf, PRInt32 amount)
+{
+PRThread *me = _PR_MD_CURRENT_THREAD();
+PRInt32 rv, err;
+#ifndef _PR_USE_POLL
+fd_set rd;
+#else
+struct pollfd pfd;
+#endif /* _PR_USE_POLL */
+PRInt32 osfd = fd->secret->md.osfd;
+
+#ifndef _PR_USE_POLL
+    FD_ZERO(&rd);
+    FD_SET(osfd, &rd);
+#else
+    pfd.fd = osfd;
+    pfd.events = POLLIN;
+#endif /* _PR_USE_POLL */
+    while ((rv = read(osfd,buf,amount)) == -1) {
+        err = _MD_ERRNO();
+        if ((err == EAGAIN) || (err == EWOULDBLOCK)) {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            if (!_PR_IS_NATIVE_THREAD(me)) {
+                if ((rv = local_io_wait(osfd, _PR_UNIX_POLL_READ,
+										PR_INTERVAL_NO_TIMEOUT)) < 0)
+					goto done;								
+            } else {
+#ifndef _PR_USE_POLL
+                while ((rv = _MD_SELECT(osfd + 1, &rd, NULL, NULL, NULL))
+                        == -1 && (err = _MD_ERRNO()) == EINTR) {
+                    /* retry _MD_SELECT() if it is interrupted */
+                }
+#else /* _PR_USE_POLL */
+                while ((rv = _MD_POLL(&pfd, 1, -1))
+                        == -1 && (err = _MD_ERRNO()) == EINTR) {
+                    /* retry _MD_POLL() if it is interrupted */
+                }
+#endif /* _PR_USE_POLL */
+                if (rv == -1) {
+                    break;
+                }
+            }
+            if (_PR_PENDING_INTERRUPT(me))
+                break;
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))){
+            continue;
+        } else {
+            break;
+        }
+    }
+    if (rv < 0) {
+        if (_PR_PENDING_INTERRUPT(me)) {
+            me->flags &= ~_PR_INTERRUPT;
+            PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+        } else {
+            _PR_MD_MAP_READ_ERROR(err);
+        }
+    }
+done:
+    return(rv);
+}
+
+PRInt32 _MD_write(PRFileDesc *fd, const void *buf, PRInt32 amount)
+{
+PRThread *me = _PR_MD_CURRENT_THREAD();
+PRInt32 rv, err;
+#ifndef _PR_USE_POLL
+fd_set wd;
+#else
+struct pollfd pfd;
+#endif /* _PR_USE_POLL */
+PRInt32 osfd = fd->secret->md.osfd;
+
+#ifndef _PR_USE_POLL
+    FD_ZERO(&wd);
+    FD_SET(osfd, &wd);
+#else
+    pfd.fd = osfd;
+    pfd.events = POLLOUT;
+#endif /* _PR_USE_POLL */
+    while ((rv = write(osfd,buf,amount)) == -1) {
+        err = _MD_ERRNO();
+        if ((err == EAGAIN) || (err == EWOULDBLOCK)) {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            if (!_PR_IS_NATIVE_THREAD(me)) {
+                if ((rv = local_io_wait(osfd, _PR_UNIX_POLL_WRITE,
+										PR_INTERVAL_NO_TIMEOUT)) < 0)
+                    goto done;
+            } else {
+#ifndef _PR_USE_POLL
+                while ((rv = _MD_SELECT(osfd + 1, NULL, &wd, NULL, NULL))
+                        == -1 && (err = _MD_ERRNO()) == EINTR) {
+                    /* retry _MD_SELECT() if it is interrupted */
+                }
+#else /* _PR_USE_POLL */
+                while ((rv = _MD_POLL(&pfd, 1, -1))
+                        == -1 && (err = _MD_ERRNO()) == EINTR) {
+                    /* retry _MD_POLL() if it is interrupted */
+                }
+#endif /* _PR_USE_POLL */
+                if (rv == -1) {
+                    break;
+                }
+            }
+            if (_PR_PENDING_INTERRUPT(me))
+                break;
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))){
+            continue;
+        } else {
+            break;
+        }
+    }
+    if (rv < 0) {
+        if (_PR_PENDING_INTERRUPT(me)) {
+            me->flags &= ~_PR_INTERRUPT;
+            PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+        } else {
+            _PR_MD_MAP_WRITE_ERROR(err);
+        }
+    }
+done:
+    return(rv);
+}
+
+PRInt32 _MD_fsync(PRFileDesc *fd)
+{
+PRInt32 rv, err;
+
+    rv = fsync(fd->secret->md.osfd);
+    if (rv == -1) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_FSYNC_ERROR(err);
+    }
+    return(rv);
+}
+
+PRInt32 _MD_close(PRInt32 osfd)
+{
+PRInt32 rv, err;
+
+    rv = close(osfd);
+    if (rv == -1) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_CLOSE_ERROR(err);
+    }
+    return(rv);
+}
+
+PRInt32 _MD_socket(PRInt32 domain, PRInt32 type, PRInt32 proto)
+{
+    PRInt32 osfd, err;
+
+    osfd = socket(domain, type, proto);
+
+    if (osfd == -1) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_SOCKET_ERROR(err);
+        return(osfd);
+    }
+
+    return(osfd);
+}
+
+PRInt32 _MD_socketavailable(PRFileDesc *fd)
+{
+    PRInt32 result;
+
+    if (ioctl(fd->secret->md.osfd, FIONREAD, &result) < 0) {
+        _PR_MD_MAP_SOCKETAVAILABLE_ERROR(_MD_ERRNO());
+        return -1;
+    }
+    return result;
+}
+
+PRInt64 _MD_socketavailable64(PRFileDesc *fd)
+{
+    PRInt64 result;
+    LL_I2L(result, _MD_socketavailable(fd));
+    return result;
+}  /* _MD_socketavailable64 */
+
+#define READ_FD        1
+#define WRITE_FD    2
+
+/*
+ * socket_io_wait --
+ *
+ * wait for socket i/o, periodically checking for interrupt
+ *
+ * The first implementation uses select(), for platforms without
+ * poll().  The second (preferred) implementation uses poll().
+ */
+
+#ifndef _PR_USE_POLL
+
+static PRInt32 socket_io_wait(PRInt32 osfd, PRInt32 fd_type,
+    PRIntervalTime timeout)
+{
+    PRInt32 rv = -1;
+    struct timeval tv;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    PRIntervalTime epoch, now, elapsed, remaining;
+    PRBool wait_for_remaining;
+    PRInt32 syserror;
+    fd_set rd_wr;
+
+    switch (timeout) {
+        case PR_INTERVAL_NO_WAIT:
+            PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+            break;
+        case PR_INTERVAL_NO_TIMEOUT:
+            /*
+             * This is a special case of the 'default' case below.
+             * Please see the comments there.
+             */
+            tv.tv_sec = _PR_INTERRUPT_CHECK_INTERVAL_SECS;
+            tv.tv_usec = 0;
+            FD_ZERO(&rd_wr);
+            do {
+                FD_SET(osfd, &rd_wr);
+                if (fd_type == READ_FD)
+                    rv = _MD_SELECT(osfd + 1, &rd_wr, NULL, NULL, &tv);
+                else
+                    rv = _MD_SELECT(osfd + 1, NULL, &rd_wr, NULL, &tv);
+                if (rv == -1 && (syserror = _MD_ERRNO()) != EINTR) {
+                    _PR_MD_MAP_SELECT_ERROR(syserror);
+                    break;
+                }
+                if (_PR_PENDING_INTERRUPT(me)) {
+                    me->flags &= ~_PR_INTERRUPT;
+                    PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+                    rv = -1;
+                    break;
+                }
+            } while (rv == 0 || (rv == -1 && syserror == EINTR));
+            break;
+        default:
+            now = epoch = PR_IntervalNow();
+            remaining = timeout;
+            FD_ZERO(&rd_wr);
+            do {
+                /*
+                 * We block in _MD_SELECT for at most
+                 * _PR_INTERRUPT_CHECK_INTERVAL_SECS seconds,
+                 * so that there is an upper limit on the delay
+                 * before the interrupt bit is checked.
+                 */
+                wait_for_remaining = PR_TRUE;
+                tv.tv_sec = PR_IntervalToSeconds(remaining);
+                if (tv.tv_sec > _PR_INTERRUPT_CHECK_INTERVAL_SECS) {
+                    wait_for_remaining = PR_FALSE;
+                    tv.tv_sec = _PR_INTERRUPT_CHECK_INTERVAL_SECS;
+                    tv.tv_usec = 0;
+                } else {
+                    tv.tv_usec = PR_IntervalToMicroseconds(
+                        remaining -
+                        PR_SecondsToInterval(tv.tv_sec));
+                }
+                FD_SET(osfd, &rd_wr);
+                if (fd_type == READ_FD)
+                    rv = _MD_SELECT(osfd + 1, &rd_wr, NULL, NULL, &tv);
+                else
+                    rv = _MD_SELECT(osfd + 1, NULL, &rd_wr, NULL, &tv);
+                /*
+                 * we don't consider EINTR a real error
+                 */
+                if (rv == -1 && (syserror = _MD_ERRNO()) != EINTR) {
+                    _PR_MD_MAP_SELECT_ERROR(syserror);
+                    break;
+                }
+                if (_PR_PENDING_INTERRUPT(me)) {
+                    me->flags &= ~_PR_INTERRUPT;
+                    PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+                    rv = -1;
+                    break;
+                }
+                /*
+                 * We loop again if _MD_SELECT timed out or got interrupted
+                 * by a signal, and the timeout deadline has not passed yet.
+                 */
+                if (rv == 0 || (rv == -1 && syserror == EINTR)) {
+                    /*
+                     * If _MD_SELECT timed out, we know how much time
+                     * we spent in blocking, so we can avoid a
+                     * PR_IntervalNow() call.
+                     */
+                    if (rv == 0) {
+                        if (wait_for_remaining) {
+                            now += remaining;
+                        } else {
+                            now += PR_SecondsToInterval(tv.tv_sec)
+                                + PR_MicrosecondsToInterval(tv.tv_usec);
+                        }
+                    } else {
+                        now = PR_IntervalNow();
+                    }
+                    elapsed = (PRIntervalTime) (now - epoch);
+                    if (elapsed >= timeout) {
+                        PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+                        rv = -1;
+                        break;
+                    } else {
+                        remaining = timeout - elapsed;
+                    }
+                }
+            } while (rv == 0 || (rv == -1 && syserror == EINTR));
+            break;
+    }
+    return(rv);
+}
+
+#else /* _PR_USE_POLL */
+
+static PRInt32 socket_io_wait(PRInt32 osfd, PRInt32 fd_type,
+    PRIntervalTime timeout)
+{
+    PRInt32 rv = -1;
+    int msecs;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    PRIntervalTime epoch, now, elapsed, remaining;
+    PRBool wait_for_remaining;
+    PRInt32 syserror;
+    struct pollfd pfd;
+
+    switch (timeout) {
+        case PR_INTERVAL_NO_WAIT:
+            PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+            break;
+        case PR_INTERVAL_NO_TIMEOUT:
+            /*
+             * This is a special case of the 'default' case below.
+             * Please see the comments there.
+             */
+            msecs = _PR_INTERRUPT_CHECK_INTERVAL_SECS * 1000;
+            pfd.fd = osfd;
+            if (fd_type == READ_FD) {
+                pfd.events = POLLIN;
+            } else {
+                pfd.events = POLLOUT;
+            }
+            do {
+                rv = _MD_POLL(&pfd, 1, msecs);
+                if (rv == -1 && (syserror = _MD_ERRNO()) != EINTR) {
+                    _PR_MD_MAP_POLL_ERROR(syserror);
+                    break;
+                }
+				/*
+				 * If POLLERR is set, don't process it; retry the operation
+				 */
+                if ((rv == 1) && (pfd.revents & (POLLHUP | POLLNVAL))) {
+					rv = -1;
+                    _PR_MD_MAP_POLL_REVENTS_ERROR(pfd.revents);
+                    break;
+                }
+                if (_PR_PENDING_INTERRUPT(me)) {
+                    me->flags &= ~_PR_INTERRUPT;
+                    PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+                    rv = -1;
+                    break;
+                }
+            } while (rv == 0 || (rv == -1 && syserror == EINTR));
+            break;
+        default:
+            now = epoch = PR_IntervalNow();
+            remaining = timeout;
+            pfd.fd = osfd;
+            if (fd_type == READ_FD) {
+                pfd.events = POLLIN;
+            } else {
+                pfd.events = POLLOUT;
+            }
+            do {
+                /*
+                 * We block in _MD_POLL for at most
+                 * _PR_INTERRUPT_CHECK_INTERVAL_SECS seconds,
+                 * so that there is an upper limit on the delay
+                 * before the interrupt bit is checked.
+                 */
+                wait_for_remaining = PR_TRUE;
+                msecs = PR_IntervalToMilliseconds(remaining);
+                if (msecs > _PR_INTERRUPT_CHECK_INTERVAL_SECS * 1000) {
+                    wait_for_remaining = PR_FALSE;
+                    msecs = _PR_INTERRUPT_CHECK_INTERVAL_SECS * 1000;
+                }
+                rv = _MD_POLL(&pfd, 1, msecs);
+                /*
+                 * we don't consider EINTR a real error
+                 */
+                if (rv == -1 && (syserror = _MD_ERRNO()) != EINTR) {
+                    _PR_MD_MAP_POLL_ERROR(syserror);
+                    break;
+                }
+                if (_PR_PENDING_INTERRUPT(me)) {
+                    me->flags &= ~_PR_INTERRUPT;
+                    PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+                    rv = -1;
+                    break;
+                }
+				/*
+				 * If POLLERR is set, don't process it; retry the operation
+				 */
+                if ((rv == 1) && (pfd.revents & (POLLHUP | POLLNVAL))) {
+					rv = -1;
+                    _PR_MD_MAP_POLL_REVENTS_ERROR(pfd.revents);
+                    break;
+                }
+                /*
+                 * We loop again if _MD_POLL timed out or got interrupted
+                 * by a signal, and the timeout deadline has not passed yet.
+                 */
+                if (rv == 0 || (rv == -1 && syserror == EINTR)) {
+                    /*
+                     * If _MD_POLL timed out, we know how much time
+                     * we spent in blocking, so we can avoid a
+                     * PR_IntervalNow() call.
+                     */
+                    if (rv == 0) {
+                        if (wait_for_remaining) {
+                            now += remaining;
+                        } else {
+                            now += PR_MillisecondsToInterval(msecs);
+                        }
+                    } else {
+                        now = PR_IntervalNow();
+                    }
+                    elapsed = (PRIntervalTime) (now - epoch);
+                    if (elapsed >= timeout) {
+                        PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+                        rv = -1;
+                        break;
+                    } else {
+                        remaining = timeout - elapsed;
+                    }
+                }
+            } while (rv == 0 || (rv == -1 && syserror == EINTR));
+            break;
+    }
+    return(rv);
+}
+
+#endif /* _PR_USE_POLL */
+
+static PRInt32 local_io_wait(
+    PRInt32 osfd,
+    PRInt32 wait_flag,
+    PRIntervalTime timeout)
+{
+    _PRUnixPollDesc pd;
+    PRInt32 rv;
+
+    PR_LOG(_pr_io_lm, PR_LOG_MIN,
+       ("waiting to %s on osfd=%d",
+        (wait_flag == _PR_UNIX_POLL_READ) ? "read" : "write",
+        osfd));
+
+    if (timeout == PR_INTERVAL_NO_WAIT) return 0;
+
+    pd.osfd = osfd;
+    pd.in_flags = wait_flag;
+    pd.out_flags = 0;
+
+    rv = _PR_WaitForMultipleFDs(&pd, 1, timeout);
+
+    if (rv == 0) {
+        PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+        rv = -1;
+    }
+    return rv;
+}
+
+
+PRInt32 _MD_recv(PRFileDesc *fd, void *buf, PRInt32 amount,
+                                PRInt32 flags, PRIntervalTime timeout)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+/*
+ * Many OS's (Solaris, Unixware) have a broken recv which won't read
+ * from socketpairs.  As long as we don't use flags on socketpairs, this
+ * is a decent fix. - mikep
+ */
+#if defined(UNIXWARE) || defined(SOLARIS)
+    while ((rv = read(osfd,buf,amount)) == -1) {
+#else
+    while ((rv = recv(osfd,buf,amount,flags)) == -1) {
+#endif
+        err = _MD_ERRNO();
+        if ((err == EAGAIN) || (err == EWOULDBLOCK)) {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            if (!_PR_IS_NATIVE_THREAD(me)) {
+				if ((rv = local_io_wait(osfd,_PR_UNIX_POLL_READ,timeout)) < 0)
+					goto done;
+            } else {
+                if ((rv = socket_io_wait(osfd, READ_FD, timeout)) < 0)
+                    goto done;
+            }
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))){
+            continue;
+        } else {
+            break;
+        }
+    }
+    if (rv < 0) {
+        _PR_MD_MAP_RECV_ERROR(err);
+    }
+done:
+    return(rv);
+}
+
+PRInt32 _MD_recvfrom(PRFileDesc *fd, void *buf, PRInt32 amount,
+                        PRIntn flags, PRNetAddr *addr, PRUint32 *addrlen,
+                        PRIntervalTime timeout)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    while ((*addrlen = PR_NETADDR_SIZE(addr)),
+                ((rv = recvfrom(osfd, buf, amount, flags,
+                        (struct sockaddr *) addr, (_PRSockLen_t *)addrlen)) == -1)) {
+        err = _MD_ERRNO();
+        if ((err == EAGAIN) || (err == EWOULDBLOCK)) {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            if (!_PR_IS_NATIVE_THREAD(me)) {
+                if ((rv = local_io_wait(osfd, _PR_UNIX_POLL_READ, timeout)) < 0)
+                    goto done;
+            } else {
+                if ((rv = socket_io_wait(osfd, READ_FD, timeout)) < 0)
+                    goto done;
+            }
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))){
+            continue;
+        } else {
+            break;
+        }
+    }
+    if (rv < 0) {
+        _PR_MD_MAP_RECVFROM_ERROR(err);
+    }
+done:
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    if (rv != -1) {
+        /* ignore the sa_len field of struct sockaddr */
+        if (addr) {
+            addr->raw.family = ((struct sockaddr *) addr)->sa_family;
+        }
+    }
+#endif /* _PR_HAVE_SOCKADDR_LEN */
+    return(rv);
+}
+
+PRInt32 _MD_send(PRFileDesc *fd, const void *buf, PRInt32 amount,
+                            PRInt32 flags, PRIntervalTime timeout)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+#if defined(SOLARIS)
+	PRInt32 tmp_amount = amount;
+#endif
+
+    /*
+     * On pre-2.6 Solaris, send() is much slower than write().
+     * On 2.6 and beyond, with in-kernel sockets, send() and
+     * write() are fairly equivalent in performance.
+     */
+#if defined(SOLARIS)
+    PR_ASSERT(0 == flags);
+    while ((rv = write(osfd,buf,tmp_amount)) == -1) {
+#else
+    while ((rv = send(osfd,buf,amount,flags)) == -1) {
+#endif
+        err = _MD_ERRNO();
+        if ((err == EAGAIN) || (err == EWOULDBLOCK))    {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            if (!_PR_IS_NATIVE_THREAD(me)) {
+                if ((rv = local_io_wait(osfd, _PR_UNIX_POLL_WRITE, timeout)) < 0)
+                    goto done;
+            } else {
+                if ((rv = socket_io_wait(osfd, WRITE_FD, timeout))< 0)
+                    goto done;
+            }
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))){
+            continue;
+        } else {
+#if defined(SOLARIS)
+			/*
+			 * The write system call has been reported to return the ERANGE
+			 * error on occasion. Try to write in smaller chunks to workaround
+			 * this bug.
+			 */
+			if (err == ERANGE) {
+				if (tmp_amount > 1) {
+					tmp_amount = tmp_amount/2;	/* half the bytes */
+					continue;
+				}
+			}
+#endif
+            break;
+        }
+    }
+        /*
+         * optimization; if bytes sent is less than "amount" call
+         * select before returning. This is because it is likely that
+         * the next send() call will return EWOULDBLOCK.
+         */
+    if ((!fd->secret->nonblocking) && (rv > 0) && (rv < amount)
+            && (timeout != PR_INTERVAL_NO_WAIT)) {
+        if (_PR_IS_NATIVE_THREAD(me)) {
+			if (socket_io_wait(osfd, WRITE_FD, timeout)< 0) {
+				rv = -1;
+				goto done;
+			}
+        } else {
+			if (local_io_wait(osfd, _PR_UNIX_POLL_WRITE, timeout) < 0) {
+				rv = -1;
+				goto done;
+			}
+        }
+    }
+    if (rv < 0) {
+        _PR_MD_MAP_SEND_ERROR(err);
+    }
+done:
+    return(rv);
+}
+
+PRInt32 _MD_sendto(
+    PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+    const PRNetAddr *addr, PRUint32 addrlen, PRIntervalTime timeout)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    PRNetAddr addrCopy;
+
+    addrCopy = *addr;
+    ((struct sockaddr *) &addrCopy)->sa_len = addrlen;
+    ((struct sockaddr *) &addrCopy)->sa_family = addr->raw.family;
+
+    while ((rv = sendto(osfd, buf, amount, flags,
+            (struct sockaddr *) &addrCopy, addrlen)) == -1) {
+#else
+    while ((rv = sendto(osfd, buf, amount, flags,
+            (struct sockaddr *) addr, addrlen)) == -1) {
+#endif
+        err = _MD_ERRNO();
+        if ((err == EAGAIN) || (err == EWOULDBLOCK))    {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            if (!_PR_IS_NATIVE_THREAD(me)) {
+				if ((rv = local_io_wait(osfd, _PR_UNIX_POLL_WRITE, timeout)) < 0)
+					goto done;
+            } else {
+                if ((rv = socket_io_wait(osfd, WRITE_FD, timeout))< 0)
+                    goto done;
+            }
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))){
+            continue;
+        } else {
+            break;
+        }
+    }
+    if (rv < 0) {
+        _PR_MD_MAP_SENDTO_ERROR(err);
+    }
+done:
+    return(rv);
+}
+
+PRInt32 _MD_writev(
+    PRFileDesc *fd, const PRIOVec *iov,
+    PRInt32 iov_size, PRIntervalTime timeout)
+{
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    PRInt32 index, amount = 0;
+    PRInt32 osfd = fd->secret->md.osfd;
+
+    /*
+     * Calculate the total number of bytes to be sent; needed for
+     * optimization later.
+     * We could avoid this if this number was passed in; but it is
+     * probably not a big deal because iov_size is usually small (less than
+     * 3)
+     */
+    if (!fd->secret->nonblocking) {
+        for (index=0; index<iov_size; index++) {
+            amount += iov[index].iov_len;
+        }
+    }
+
+    while ((rv = writev(osfd, (const struct iovec*)iov, iov_size)) == -1) {
+        err = _MD_ERRNO();
+        if ((err == EAGAIN) || (err == EWOULDBLOCK))    {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            if (!_PR_IS_NATIVE_THREAD(me)) {
+				if ((rv = local_io_wait(osfd, _PR_UNIX_POLL_WRITE, timeout)) < 0)
+					goto done;
+            } else {
+                if ((rv = socket_io_wait(osfd, WRITE_FD, timeout))<0)
+                    goto done;
+            }
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))){
+            continue;
+        } else {
+            break;
+        }
+    }
+    /*
+     * optimization; if bytes sent is less than "amount" call
+     * select before returning. This is because it is likely that
+     * the next writev() call will return EWOULDBLOCK.
+     */
+    if ((!fd->secret->nonblocking) && (rv > 0) && (rv < amount)
+            && (timeout != PR_INTERVAL_NO_WAIT)) {
+        if (_PR_IS_NATIVE_THREAD(me)) {
+            if (socket_io_wait(osfd, WRITE_FD, timeout) < 0) {
+				rv = -1;
+                goto done;
+			}
+        } else {
+			if (local_io_wait(osfd, _PR_UNIX_POLL_WRITE, timeout) < 0) {
+				rv = -1;
+				goto done;
+			}
+        }
+    }
+    if (rv < 0) {
+        _PR_MD_MAP_WRITEV_ERROR(err);
+    }
+done:
+    return(rv);
+}
+
+PRInt32 _MD_accept(PRFileDesc *fd, PRNetAddr *addr,
+                            PRUint32 *addrlen, PRIntervalTime timeout)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    while ((rv = accept(osfd, (struct sockaddr *) addr,
+                                        (_PRSockLen_t *)addrlen)) == -1) {
+        err = _MD_ERRNO();
+        if ((err == EAGAIN) || (err == EWOULDBLOCK) || (err == ECONNABORTED)) {
+            if (fd->secret->nonblocking) {
+                break;
+            }
+            if (!_PR_IS_NATIVE_THREAD(me)) {
+				if ((rv = local_io_wait(osfd, _PR_UNIX_POLL_READ, timeout)) < 0)
+					goto done;
+            } else {
+                if ((rv = socket_io_wait(osfd, READ_FD, timeout)) < 0)
+                    goto done;
+            }
+        } else if ((err == EINTR) && (!_PR_PENDING_INTERRUPT(me))){
+            continue;
+        } else {
+            break;
+        }
+    }
+    if (rv < 0) {
+        _PR_MD_MAP_ACCEPT_ERROR(err);
+    }
+done:
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    if (rv != -1) {
+        /* ignore the sa_len field of struct sockaddr */
+        if (addr) {
+            addr->raw.family = ((struct sockaddr *) addr)->sa_family;
+        }
+    }
+#endif /* _PR_HAVE_SOCKADDR_LEN */
+    return(rv);
+}
+
+extern int _connect (int s, const struct sockaddr *name, int namelen);
+PRInt32 _MD_connect(
+    PRFileDesc *fd, const PRNetAddr *addr, PRUint32 addrlen, PRIntervalTime timeout)
+{
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    PRInt32 osfd = fd->secret->md.osfd;
+#ifdef IRIX
+extern PRInt32 _MD_irix_connect(
+        PRInt32 osfd, const PRNetAddr *addr, PRInt32 addrlen, PRIntervalTime timeout);
+#endif
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    PRNetAddr addrCopy;
+
+    addrCopy = *addr;
+    ((struct sockaddr *) &addrCopy)->sa_len = addrlen;
+    ((struct sockaddr *) &addrCopy)->sa_family = addr->raw.family;
+#endif
+
+    /*
+     * We initiate the connection setup by making a nonblocking connect()
+     * call.  If the connect() call fails, there are two cases we handle
+     * specially:
+     * 1. The connect() call was interrupted by a signal.  In this case
+     *    we simply retry connect().
+     * 2. The NSPR socket is nonblocking and connect() fails with
+     *    EINPROGRESS.  We first wait until the socket becomes writable.
+     *    Then we try to find out whether the connection setup succeeded
+     *    or failed.
+     */
+
+retry:
+#ifdef IRIX
+    if ((rv = _MD_irix_connect(osfd, addr, addrlen, timeout)) == -1) {
+#else
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    if ((rv = connect(osfd, (struct sockaddr *)&addrCopy, addrlen)) == -1) {
+#else
+    if ((rv = connect(osfd, (struct sockaddr *)addr, addrlen)) == -1) {
+#endif
+#endif
+        err = _MD_ERRNO();
+
+        if (err == EINTR) {
+            if (_PR_PENDING_INTERRUPT(me)) {
+                me->flags &= ~_PR_INTERRUPT;
+                PR_SetError( PR_PENDING_INTERRUPT_ERROR, 0);
+                return -1;
+            }
+            goto retry;
+        }
+
+        if (!fd->secret->nonblocking && (err == EINPROGRESS)) {
+            if (!_PR_IS_NATIVE_THREAD(me)) {
+
+				if ((rv = local_io_wait(osfd, _PR_UNIX_POLL_WRITE, timeout)) < 0)
+                    return -1;
+            } else {
+                /*
+                 * socket_io_wait() may return -1 or 1.
+                 */
+
+                rv = socket_io_wait(osfd, WRITE_FD, timeout);
+                if (rv == -1) {
+                    return -1;
+                }
+            }
+
+            PR_ASSERT(rv == 1);
+            if (_PR_PENDING_INTERRUPT(me)) {
+                me->flags &= ~_PR_INTERRUPT;
+                PR_SetError( PR_PENDING_INTERRUPT_ERROR, 0);
+                return -1;
+            }
+            err = _MD_unix_get_nonblocking_connect_error(osfd);
+            if (err != 0) {
+                _PR_MD_MAP_CONNECT_ERROR(err);
+                return -1;
+            }
+            return 0;
+        }
+
+        _PR_MD_MAP_CONNECT_ERROR(err);
+    }
+
+    return rv;
+}  /* _MD_connect */
+
+PRInt32 _MD_bind(PRFileDesc *fd, const PRNetAddr *addr, PRUint32 addrlen)
+{
+    PRInt32 rv, err;
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    PRNetAddr addrCopy;
+
+    addrCopy = *addr;
+    ((struct sockaddr *) &addrCopy)->sa_len = addrlen;
+    ((struct sockaddr *) &addrCopy)->sa_family = addr->raw.family;
+    rv = bind(fd->secret->md.osfd, (struct sockaddr *) &addrCopy, (int )addrlen);
+#else
+    rv = bind(fd->secret->md.osfd, (struct sockaddr *) addr, (int )addrlen);
+#endif
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_BIND_ERROR(err);
+    }
+    return(rv);
+}
+
+PRInt32 _MD_listen(PRFileDesc *fd, PRIntn backlog)
+{
+    PRInt32 rv, err;
+
+    rv = listen(fd->secret->md.osfd, backlog);
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_LISTEN_ERROR(err);
+    }
+    return(rv);
+}
+
+PRInt32 _MD_shutdown(PRFileDesc *fd, PRIntn how)
+{
+    PRInt32 rv, err;
+
+    rv = shutdown(fd->secret->md.osfd, how);
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_SHUTDOWN_ERROR(err);
+    }
+    return(rv);
+}
+
+PRInt32 _MD_socketpair(int af, int type, int flags,
+                                                        PRInt32 *osfd)
+{
+    PRInt32 rv, err;
+
+    rv = socketpair(af, type, flags, osfd);
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_SOCKETPAIR_ERROR(err);
+    }
+    return rv;
+}
+
+PRStatus _MD_getsockname(PRFileDesc *fd, PRNetAddr *addr,
+                                                PRUint32 *addrlen)
+{
+    PRInt32 rv, err;
+
+    rv = getsockname(fd->secret->md.osfd,
+            (struct sockaddr *) addr, (_PRSockLen_t *)addrlen);
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    if (rv == 0) {
+        /* ignore the sa_len field of struct sockaddr */
+        if (addr) {
+            addr->raw.family = ((struct sockaddr *) addr)->sa_family;
+        }
+    }
+#endif /* _PR_HAVE_SOCKADDR_LEN */
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_GETSOCKNAME_ERROR(err);
+    }
+    return rv==0?PR_SUCCESS:PR_FAILURE;
+}
+
+PRStatus _MD_getpeername(PRFileDesc *fd, PRNetAddr *addr,
+                                        PRUint32 *addrlen)
+{
+    PRInt32 rv, err;
+
+    rv = getpeername(fd->secret->md.osfd,
+            (struct sockaddr *) addr, (_PRSockLen_t *)addrlen);
+#ifdef _PR_HAVE_SOCKADDR_LEN
+    if (rv == 0) {
+        /* ignore the sa_len field of struct sockaddr */
+        if (addr) {
+            addr->raw.family = ((struct sockaddr *) addr)->sa_family;
+        }
+    }
+#endif /* _PR_HAVE_SOCKADDR_LEN */
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_GETPEERNAME_ERROR(err);
+    }
+    return rv==0?PR_SUCCESS:PR_FAILURE;
+}
+
+PRStatus _MD_getsockopt(PRFileDesc *fd, PRInt32 level,
+                        PRInt32 optname, char* optval, PRInt32* optlen)
+{
+    PRInt32 rv, err;
+
+    rv = getsockopt(fd->secret->md.osfd, level, optname, optval, (_PRSockLen_t *)optlen);
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_GETSOCKOPT_ERROR(err);
+    }
+    return rv==0?PR_SUCCESS:PR_FAILURE;
+}
+
+PRStatus _MD_setsockopt(PRFileDesc *fd, PRInt32 level,   
+                    PRInt32 optname, const char* optval, PRInt32 optlen)
+{
+    PRInt32 rv, err;
+
+    rv = setsockopt(fd->secret->md.osfd, level, optname, optval, optlen);
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_SETSOCKOPT_ERROR(err);
+    }
+    return rv==0?PR_SUCCESS:PR_FAILURE;
+}
+
+PRStatus _MD_set_fd_inheritable(PRFileDesc *fd, PRBool inheritable)
+{
+    int rv;
+
+    rv = fcntl(fd->secret->md.osfd, F_SETFD, inheritable ? 0 : FD_CLOEXEC);
+    if (-1 == rv) {
+        PR_SetError(PR_UNKNOWN_ERROR, _MD_ERRNO());
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}
+
+void _MD_init_fd_inheritable(PRFileDesc *fd, PRBool imported)
+{
+    if (imported) {
+        fd->secret->inheritable = _PR_TRI_UNKNOWN;
+    } else {
+        /* By default, a Unix fd is not closed on exec. */
+#ifdef DEBUG
+        {
+            int flags = fcntl(fd->secret->md.osfd, F_GETFD, 0);
+            PR_ASSERT(0 == flags);
+        }
+#endif
+        fd->secret->inheritable = _PR_TRI_TRUE;
+    }
+}
+
+/************************************************************************/
+#if !defined(_PR_USE_POLL)
+
+/*
+** Scan through io queue and find any bad fd's that triggered the error
+** from _MD_SELECT
+*/
+static void FindBadFDs(void)
+{
+    PRCList *q;
+    PRThread *me = _MD_CURRENT_THREAD();
+
+    PR_ASSERT(!_PR_IS_NATIVE_THREAD(me));
+    q = (_PR_IOQ(me->cpu)).next;
+    _PR_IOQ_MAX_OSFD(me->cpu) = -1;
+    _PR_IOQ_TIMEOUT(me->cpu) = PR_INTERVAL_NO_TIMEOUT;
+    while (q != &_PR_IOQ(me->cpu)) {
+        PRPollQueue *pq = _PR_POLLQUEUE_PTR(q);
+        PRBool notify = PR_FALSE;
+        _PRUnixPollDesc *pds = pq->pds;
+        _PRUnixPollDesc *epds = pds + pq->npds;
+        PRInt32 pq_max_osfd = -1;
+
+        q = q->next;
+        for (; pds < epds; pds++) {
+            PRInt32 osfd = pds->osfd;
+            pds->out_flags = 0;
+            PR_ASSERT(osfd >= 0 || pds->in_flags == 0);
+            if (pds->in_flags == 0) {
+                continue;  /* skip this fd */
+            }
+            if (fcntl(osfd, F_GETFL, 0) == -1) {
+                /* Found a bad descriptor, remove it from the fd_sets. */
+                PR_LOG(_pr_io_lm, PR_LOG_MAX,
+                    ("file descriptor %d is bad", osfd));
+                pds->out_flags = _PR_UNIX_POLL_NVAL;
+                notify = PR_TRUE;
+            }
+            if (osfd > pq_max_osfd) {
+                pq_max_osfd = osfd;
+            }
+        }
+
+        if (notify) {
+            PRIntn pri;
+            PR_REMOVE_LINK(&pq->links);
+            pq->on_ioq = PR_FALSE;
+
+            /*
+         * Decrement the count of descriptors for each desciptor/event
+         * because this I/O request is being removed from the
+         * ioq
+         */
+            pds = pq->pds;
+            for (; pds < epds; pds++) {
+                PRInt32 osfd = pds->osfd;
+                PRInt16 in_flags = pds->in_flags;
+                PR_ASSERT(osfd >= 0 || in_flags == 0);
+                if (in_flags & _PR_UNIX_POLL_READ) {
+                    if (--(_PR_FD_READ_CNT(me->cpu))[osfd] == 0)
+                        FD_CLR(osfd, &_PR_FD_READ_SET(me->cpu));
+                }
+                if (in_flags & _PR_UNIX_POLL_WRITE) {
+                    if (--(_PR_FD_WRITE_CNT(me->cpu))[osfd] == 0)
+                        FD_CLR(osfd, &_PR_FD_WRITE_SET(me->cpu));
+                }
+                if (in_flags & _PR_UNIX_POLL_EXCEPT) {
+                    if (--(_PR_FD_EXCEPTION_CNT(me->cpu))[osfd] == 0)
+                        FD_CLR(osfd, &_PR_FD_EXCEPTION_SET(me->cpu));
+                }
+            }
+
+            _PR_THREAD_LOCK(pq->thr);
+            if (pq->thr->flags & (_PR_ON_PAUSEQ|_PR_ON_SLEEPQ)) {
+                _PRCPU *cpu = pq->thr->cpu;
+                _PR_SLEEPQ_LOCK(pq->thr->cpu);
+                _PR_DEL_SLEEPQ(pq->thr, PR_TRUE);
+                _PR_SLEEPQ_UNLOCK(pq->thr->cpu);
+
+				if (pq->thr->flags & _PR_SUSPENDING) {
+				    /*
+				     * set thread state to SUSPENDED;
+				     * a Resume operation on the thread
+				     * will move it to the runQ
+				     */
+				    pq->thr->state = _PR_SUSPENDED;
+				    _PR_MISCQ_LOCK(pq->thr->cpu);
+				    _PR_ADD_SUSPENDQ(pq->thr, pq->thr->cpu);
+				    _PR_MISCQ_UNLOCK(pq->thr->cpu);
+				} else {
+				    pri = pq->thr->priority;
+				    pq->thr->state = _PR_RUNNABLE;
+
+				    _PR_RUNQ_LOCK(cpu);
+				    _PR_ADD_RUNQ(pq->thr, cpu, pri);
+				    _PR_RUNQ_UNLOCK(cpu);
+				}
+            }
+            _PR_THREAD_UNLOCK(pq->thr);
+        } else {
+            if (pq->timeout < _PR_IOQ_TIMEOUT(me->cpu))
+                _PR_IOQ_TIMEOUT(me->cpu) = pq->timeout;
+            if (_PR_IOQ_MAX_OSFD(me->cpu) < pq_max_osfd)
+                _PR_IOQ_MAX_OSFD(me->cpu) = pq_max_osfd;
+        }
+    }
+    if (_PR_IS_NATIVE_THREAD_SUPPORTED()) {
+        if (_PR_IOQ_MAX_OSFD(me->cpu) < _pr_md_pipefd[0])
+            _PR_IOQ_MAX_OSFD(me->cpu) = _pr_md_pipefd[0];
+    }
+}
+#endif  /* !defined(_PR_USE_POLL) */
+
+/************************************************************************/
+
+/*
+** Called by the scheduler when there is nothing to do. This means that
+** all threads are blocked on some monitor somewhere.
+**
+** Note: this code doesn't release the scheduler lock.
+*/
+/*
+** Pause the current CPU. longjmp to the cpu's pause stack
+**
+** This must be called with the scheduler locked
+*/
+void _MD_PauseCPU(PRIntervalTime ticks)
+{
+    PRThread *me = _MD_CURRENT_THREAD();
+#ifdef _PR_USE_POLL
+    int timeout;
+    struct pollfd *pollfds;    /* an array of pollfd structures */
+    struct pollfd *pollfdPtr;    /* a pointer that steps through the array */
+    unsigned long npollfds;     /* number of pollfd structures in array */
+    unsigned long pollfds_size;
+    int nfd;                    /* to hold the return value of poll() */
+#else
+    struct timeval timeout, *tvp;
+    fd_set r, w, e;
+    fd_set *rp, *wp, *ep;
+    PRInt32 max_osfd, nfd;
+#endif  /* _PR_USE_POLL */
+    PRInt32 rv;
+    PRCList *q;
+    PRUint32 min_timeout;
+    sigset_t oldset;
+#ifdef IRIX
+extern sigset_t ints_off;
+#endif
+
+    PR_ASSERT(_PR_MD_GET_INTSOFF() != 0);
+
+    _PR_MD_IOQ_LOCK();
+
+#ifdef _PR_USE_POLL
+    /* Build up the pollfd structure array to wait on */
+
+    /* Find out how many pollfd structures are needed */
+    npollfds = _PR_IOQ_OSFD_CNT(me->cpu);
+    PR_ASSERT(npollfds >= 0);
+
+    /*
+     * We use a pipe to wake up a native thread.  An fd is needed
+     * for the pipe and we poll it for reading.
+     */
+    if (_PR_IS_NATIVE_THREAD_SUPPORTED()) {
+        npollfds++;
+#ifdef	IRIX
+		/*
+		 * On Irix, a second pipe is used to cause the primordial cpu to
+		 * wakeup and exit, when the process is exiting because of a call
+		 * to exit/PR_ProcessExit.
+		 */
+		if (me->cpu->id == 0) {
+        	npollfds++;
+		}
+#endif
+	}
+
+    /*
+     * if the cpu's pollfd array is not big enough, release it and allocate a new one
+     */
+    if (npollfds > _PR_IOQ_POLLFDS_SIZE(me->cpu)) {
+        if (_PR_IOQ_POLLFDS(me->cpu) != NULL)
+            PR_DELETE(_PR_IOQ_POLLFDS(me->cpu));
+        pollfds_size =  PR_MAX(_PR_IOQ_MIN_POLLFDS_SIZE(me->cpu), npollfds);
+        pollfds = (struct pollfd *) PR_MALLOC(pollfds_size * sizeof(struct pollfd));
+        _PR_IOQ_POLLFDS(me->cpu) = pollfds;
+        _PR_IOQ_POLLFDS_SIZE(me->cpu) = pollfds_size;
+    } else {
+        pollfds = _PR_IOQ_POLLFDS(me->cpu);
+    }
+    pollfdPtr = pollfds;
+
+    /*
+     * If we need to poll the pipe for waking up a native thread,
+     * the pipe's fd is the first element in the pollfds array.
+     */
+    if (_PR_IS_NATIVE_THREAD_SUPPORTED()) {
+        pollfdPtr->fd = _pr_md_pipefd[0];
+        pollfdPtr->events = POLLIN;
+        pollfdPtr++;
+#ifdef	IRIX
+		/*
+		 * On Irix, the second element is the exit pipe
+		 */
+		if (me->cpu->id == 0) {
+			pollfdPtr->fd = _pr_irix_primoridal_cpu_fd[0];
+			pollfdPtr->events = POLLIN;
+			pollfdPtr++;
+		}
+#endif
+    }
+
+    min_timeout = PR_INTERVAL_NO_TIMEOUT;
+    for (q = _PR_IOQ(me->cpu).next; q != &_PR_IOQ(me->cpu); q = q->next) {
+        PRPollQueue *pq = _PR_POLLQUEUE_PTR(q);
+        _PRUnixPollDesc *pds = pq->pds;
+        _PRUnixPollDesc *epds = pds + pq->npds;
+
+        if (pq->timeout < min_timeout) {
+            min_timeout = pq->timeout;
+        }
+        for (; pds < epds; pds++, pollfdPtr++) {
+            /*
+         * Assert that the pollfdPtr pointer does not go
+         * beyond the end of the pollfds array
+         */
+            PR_ASSERT(pollfdPtr < pollfds + npollfds);
+            pollfdPtr->fd = pds->osfd;
+            /* direct copy of poll flags */
+            pollfdPtr->events = pds->in_flags;
+        }
+    }
+    _PR_IOQ_TIMEOUT(me->cpu) = min_timeout;
+#else
+    /*
+     * assigment of fd_sets
+     */
+    r = _PR_FD_READ_SET(me->cpu);
+    w = _PR_FD_WRITE_SET(me->cpu);
+    e = _PR_FD_EXCEPTION_SET(me->cpu);
+
+    rp = &r;
+    wp = &w;
+    ep = &e;
+
+    max_osfd = _PR_IOQ_MAX_OSFD(me->cpu) + 1;
+    min_timeout = _PR_IOQ_TIMEOUT(me->cpu);
+#endif  /* _PR_USE_POLL */
+    /*
+    ** Compute the minimum timeout value: make it the smaller of the
+    ** timeouts specified by the i/o pollers or the timeout of the first
+    ** sleeping thread.
+    */
+    q = _PR_SLEEPQ(me->cpu).next;
+
+    if (q != &_PR_SLEEPQ(me->cpu)) {
+        PRThread *t = _PR_THREAD_PTR(q);
+
+        if (t->sleep < min_timeout) {
+            min_timeout = t->sleep;
+        }
+    }
+    if (min_timeout > ticks) {
+        min_timeout = ticks;
+    }
+
+#ifdef _PR_USE_POLL
+    if (min_timeout == PR_INTERVAL_NO_TIMEOUT)
+        timeout = -1;
+    else
+        timeout = PR_IntervalToMilliseconds(min_timeout);
+#else
+    if (min_timeout == PR_INTERVAL_NO_TIMEOUT) {
+        tvp = NULL;
+    } else {
+        timeout.tv_sec = PR_IntervalToSeconds(min_timeout);
+        timeout.tv_usec = PR_IntervalToMicroseconds(min_timeout)
+            % PR_USEC_PER_SEC;
+        tvp = &timeout;
+    }
+#endif  /* _PR_USE_POLL */
+
+    _PR_MD_IOQ_UNLOCK();
+    _MD_CHECK_FOR_EXIT();
+    /*
+     * check for i/o operations
+     */
+#ifndef _PR_NO_CLOCK_TIMER
+    /*
+     * Disable the clock interrupts while we are in select, if clock interrupts
+     * are enabled. Otherwise, when the select/poll calls are interrupted, the
+     * timer value starts ticking from zero again when the system call is restarted.
+     */
+#ifdef IRIX
+    /*
+     * SIGCHLD signal is used on Irix to detect he termination of an
+     * sproc by SIGSEGV, SIGBUS or SIGABRT signals when
+     * _nspr_terminate_on_error is set.
+     */
+    if ((!_nspr_noclock) || (_nspr_terminate_on_error))
+#else
+        if (!_nspr_noclock)
+#endif    /* IRIX */
+#ifdef IRIX
+    sigprocmask(SIG_BLOCK, &ints_off, &oldset);
+#else
+    PR_ASSERT(sigismember(&timer_set, SIGALRM));
+    sigprocmask(SIG_BLOCK, &timer_set, &oldset);
+#endif    /* IRIX */
+#endif  /* !_PR_NO_CLOCK_TIMER */
+
+#ifndef _PR_USE_POLL
+    PR_ASSERT(FD_ISSET(_pr_md_pipefd[0],rp));
+    nfd = _MD_SELECT(max_osfd, rp, wp, ep, tvp);
+#else
+    nfd = _MD_POLL(pollfds, npollfds, timeout);
+#endif  /* !_PR_USE_POLL */
+
+#ifndef _PR_NO_CLOCK_TIMER
+#ifdef IRIX
+    if ((!_nspr_noclock) || (_nspr_terminate_on_error))
+#else
+        if (!_nspr_noclock)
+#endif    /* IRIX */
+    sigprocmask(SIG_SETMASK, &oldset, 0);
+#endif  /* !_PR_NO_CLOCK_TIMER */
+
+    _MD_CHECK_FOR_EXIT();
+
+#ifdef IRIX
+	_PR_MD_primordial_cpu();
+#endif
+
+    _PR_MD_IOQ_LOCK();
+    /*
+    ** Notify monitors that are associated with the selected descriptors.
+    */
+#ifdef _PR_USE_POLL
+    if (nfd > 0) {
+        pollfdPtr = pollfds;
+        if (_PR_IS_NATIVE_THREAD_SUPPORTED()) {
+            /*
+			 * Assert that the pipe is the first element in the
+			 * pollfds array.
+			 */
+            PR_ASSERT(pollfds[0].fd == _pr_md_pipefd[0]);
+            if ((pollfds[0].revents & POLLIN) && (nfd == 1)) {
+                /*
+				 * woken up by another thread; read all the data
+				 * in the pipe to empty the pipe
+				 */
+                while ((rv = read(_pr_md_pipefd[0], _pr_md_pipebuf,
+                    PIPE_BUF)) == PIPE_BUF){
+                }
+                PR_ASSERT((rv > 0) || ((rv == -1) && (errno == EAGAIN)));
+            }
+            pollfdPtr++;
+#ifdef	IRIX
+			/*
+			 * On Irix, check to see if the primordial cpu needs to exit
+			 * to cause the process to terminate
+			 */
+			if (me->cpu->id == 0) {
+            	PR_ASSERT(pollfds[1].fd == _pr_irix_primoridal_cpu_fd[0]);
+				if (pollfdPtr->revents & POLLIN) {
+					if (_pr_irix_process_exit) {
+						/*
+						 * process exit due to a call to PR_ProcessExit
+						 */
+						prctl(PR_SETEXITSIG, SIGKILL);
+						_exit(_pr_irix_process_exit_code);
+					} else {
+						while ((rv = read(_pr_irix_primoridal_cpu_fd[0],
+							_pr_md_pipebuf, PIPE_BUF)) == PIPE_BUF) {
+						}
+						PR_ASSERT(rv > 0);
+					}
+				}
+				pollfdPtr++;
+			}
+#endif
+        }
+        for (q = _PR_IOQ(me->cpu).next; q != &_PR_IOQ(me->cpu); q = q->next) {
+            PRPollQueue *pq = _PR_POLLQUEUE_PTR(q);
+            PRBool notify = PR_FALSE;
+            _PRUnixPollDesc *pds = pq->pds;
+            _PRUnixPollDesc *epds = pds + pq->npds;
+
+            for (; pds < epds; pds++, pollfdPtr++) {
+                /*
+                  * Assert that the pollfdPtr pointer does not go beyond
+                  * the end of the pollfds array.
+                  */
+                PR_ASSERT(pollfdPtr < pollfds + npollfds);
+                /*
+                 * Assert that the fd's in the pollfds array (stepped
+                 * through by pollfdPtr) are in the same order as
+                 * the fd's in _PR_IOQ() (stepped through by q and pds).
+                 * This is how the pollfds array was created earlier.
+                 */
+                PR_ASSERT(pollfdPtr->fd == pds->osfd);
+                pds->out_flags = pollfdPtr->revents;
+                /* Negative fd's are ignored by poll() */
+                if (pds->osfd >= 0 && pds->out_flags) {
+                    notify = PR_TRUE;
+                }
+            }
+            if (notify) {
+                PRIntn pri;
+                PRThread *thred;
+
+                PR_REMOVE_LINK(&pq->links);
+                pq->on_ioq = PR_FALSE;
+
+                thred = pq->thr;
+                _PR_THREAD_LOCK(thred);
+                if (pq->thr->flags & (_PR_ON_PAUSEQ|_PR_ON_SLEEPQ)) {
+                    _PRCPU *cpu = pq->thr->cpu;
+                    _PR_SLEEPQ_LOCK(pq->thr->cpu);
+                    _PR_DEL_SLEEPQ(pq->thr, PR_TRUE);
+                    _PR_SLEEPQ_UNLOCK(pq->thr->cpu);
+
+					if (pq->thr->flags & _PR_SUSPENDING) {
+					    /*
+					     * set thread state to SUSPENDED;
+					     * a Resume operation on the thread
+					     * will move it to the runQ
+					     */
+					    pq->thr->state = _PR_SUSPENDED;
+					    _PR_MISCQ_LOCK(pq->thr->cpu);
+					    _PR_ADD_SUSPENDQ(pq->thr, pq->thr->cpu);
+					    _PR_MISCQ_UNLOCK(pq->thr->cpu);
+					} else {
+						pri = pq->thr->priority;
+						pq->thr->state = _PR_RUNNABLE;
+
+						_PR_RUNQ_LOCK(cpu);
+						_PR_ADD_RUNQ(pq->thr, cpu, pri);
+						_PR_RUNQ_UNLOCK(cpu);
+						if (_pr_md_idle_cpus > 1)
+							_PR_MD_WAKEUP_WAITER(thred);
+					}
+                }
+                _PR_THREAD_UNLOCK(thred);
+                _PR_IOQ_OSFD_CNT(me->cpu) -= pq->npds;
+                PR_ASSERT(_PR_IOQ_OSFD_CNT(me->cpu) >= 0);
+            }
+        }
+    } else if (nfd == -1) {
+        PR_LOG(_pr_io_lm, PR_LOG_MAX, ("poll() failed with errno %d", errno));
+    }
+
+#else
+    if (nfd > 0) {
+        q = _PR_IOQ(me->cpu).next;
+        _PR_IOQ_MAX_OSFD(me->cpu) = -1;
+        _PR_IOQ_TIMEOUT(me->cpu) = PR_INTERVAL_NO_TIMEOUT;
+        while (q != &_PR_IOQ(me->cpu)) {
+            PRPollQueue *pq = _PR_POLLQUEUE_PTR(q);
+            PRBool notify = PR_FALSE;
+            _PRUnixPollDesc *pds = pq->pds;
+            _PRUnixPollDesc *epds = pds + pq->npds;
+            PRInt32 pq_max_osfd = -1;
+
+            q = q->next;
+            for (; pds < epds; pds++) {
+                PRInt32 osfd = pds->osfd;
+                PRInt16 in_flags = pds->in_flags;
+                PRInt16 out_flags = 0;
+                PR_ASSERT(osfd >= 0 || in_flags == 0);
+                if ((in_flags & _PR_UNIX_POLL_READ) && FD_ISSET(osfd, rp)) {
+                    out_flags |= _PR_UNIX_POLL_READ;
+                }
+                if ((in_flags & _PR_UNIX_POLL_WRITE) && FD_ISSET(osfd, wp)) {
+                    out_flags |= _PR_UNIX_POLL_WRITE;
+                }
+                if ((in_flags & _PR_UNIX_POLL_EXCEPT) && FD_ISSET(osfd, ep)) {
+                    out_flags |= _PR_UNIX_POLL_EXCEPT;
+                }
+                pds->out_flags = out_flags;
+                if (out_flags) {
+                    notify = PR_TRUE;
+                }
+                if (osfd > pq_max_osfd) {
+                    pq_max_osfd = osfd;
+                }
+            }
+            if (notify == PR_TRUE) {
+                PRIntn pri;
+                PRThread *thred;
+
+                PR_REMOVE_LINK(&pq->links);
+                pq->on_ioq = PR_FALSE;
+
+                /*
+                 * Decrement the count of descriptors for each desciptor/event
+                 * because this I/O request is being removed from the
+                 * ioq
+                 */
+                pds = pq->pds;
+                for (; pds < epds; pds++) {
+                    PRInt32 osfd = pds->osfd;
+                    PRInt16 in_flags = pds->in_flags;
+                    PR_ASSERT(osfd >= 0 || in_flags == 0);
+                    if (in_flags & _PR_UNIX_POLL_READ) {
+                        if (--(_PR_FD_READ_CNT(me->cpu))[osfd] == 0)
+                            FD_CLR(osfd, &_PR_FD_READ_SET(me->cpu));
+                    }
+                    if (in_flags & _PR_UNIX_POLL_WRITE) {
+                        if (--(_PR_FD_WRITE_CNT(me->cpu))[osfd] == 0)
+                            FD_CLR(osfd, &_PR_FD_WRITE_SET(me->cpu));
+                    }
+                    if (in_flags & _PR_UNIX_POLL_EXCEPT) {
+                        if (--(_PR_FD_EXCEPTION_CNT(me->cpu))[osfd] == 0)
+                            FD_CLR(osfd, &_PR_FD_EXCEPTION_SET(me->cpu));
+                    }
+                }
+
+                /*
+                 * Because this thread can run on a different cpu right
+                 * after being added to the run queue, do not dereference
+                 * pq
+                 */
+                 thred = pq->thr;
+                _PR_THREAD_LOCK(thred);
+                if (pq->thr->flags & (_PR_ON_PAUSEQ|_PR_ON_SLEEPQ)) {
+                    _PRCPU *cpu = thred->cpu;
+                    _PR_SLEEPQ_LOCK(pq->thr->cpu);
+                    _PR_DEL_SLEEPQ(pq->thr, PR_TRUE);
+                    _PR_SLEEPQ_UNLOCK(pq->thr->cpu);
+
+					if (pq->thr->flags & _PR_SUSPENDING) {
+					    /*
+					     * set thread state to SUSPENDED;
+					     * a Resume operation on the thread
+					     * will move it to the runQ
+					     */
+					    pq->thr->state = _PR_SUSPENDED;
+					    _PR_MISCQ_LOCK(pq->thr->cpu);
+					    _PR_ADD_SUSPENDQ(pq->thr, pq->thr->cpu);
+					    _PR_MISCQ_UNLOCK(pq->thr->cpu);
+					} else {
+						pri = pq->thr->priority;
+						pq->thr->state = _PR_RUNNABLE;
+
+						pq->thr->cpu = cpu;
+						_PR_RUNQ_LOCK(cpu);
+						_PR_ADD_RUNQ(pq->thr, cpu, pri);
+						_PR_RUNQ_UNLOCK(cpu);
+						if (_pr_md_idle_cpus > 1)
+							_PR_MD_WAKEUP_WAITER(thred);
+					}
+                }
+                _PR_THREAD_UNLOCK(thred);
+            } else {
+                if (pq->timeout < _PR_IOQ_TIMEOUT(me->cpu))
+                    _PR_IOQ_TIMEOUT(me->cpu) = pq->timeout;
+                if (_PR_IOQ_MAX_OSFD(me->cpu) < pq_max_osfd)
+                    _PR_IOQ_MAX_OSFD(me->cpu) = pq_max_osfd;
+            }
+        }
+        if (_PR_IS_NATIVE_THREAD_SUPPORTED()) {
+            if ((FD_ISSET(_pr_md_pipefd[0], rp)) && (nfd == 1)) {
+                /*
+             * woken up by another thread; read all the data
+             * in the pipe to empty the pipe
+             */
+                while ((rv =
+                    read(_pr_md_pipefd[0], _pr_md_pipebuf, PIPE_BUF))
+                    == PIPE_BUF){
+                }
+                PR_ASSERT((rv > 0) ||
+                    ((rv == -1) && (errno == EAGAIN)));
+            }
+            if (_PR_IOQ_MAX_OSFD(me->cpu) < _pr_md_pipefd[0])
+                _PR_IOQ_MAX_OSFD(me->cpu) = _pr_md_pipefd[0];
+#ifdef	IRIX
+			if ((me->cpu->id == 0) && 
+						(FD_ISSET(_pr_irix_primoridal_cpu_fd[0], rp))) {
+				if (_pr_irix_process_exit) {
+					/*
+					 * process exit due to a call to PR_ProcessExit
+					 */
+					prctl(PR_SETEXITSIG, SIGKILL);
+					_exit(_pr_irix_process_exit_code);
+				} else {
+						while ((rv = read(_pr_irix_primoridal_cpu_fd[0],
+							_pr_md_pipebuf, PIPE_BUF)) == PIPE_BUF) {
+						}
+						PR_ASSERT(rv > 0);
+				}
+			}
+			if (me->cpu->id == 0) {
+				if (_PR_IOQ_MAX_OSFD(me->cpu) < _pr_irix_primoridal_cpu_fd[0])
+					_PR_IOQ_MAX_OSFD(me->cpu) = _pr_irix_primoridal_cpu_fd[0];
+			}
+#endif
+        }
+    } else if (nfd < 0) {
+        if (errno == EBADF) {
+            FindBadFDs();
+        } else {
+            PR_LOG(_pr_io_lm, PR_LOG_MAX, ("select() failed with errno %d",
+                errno));
+        }
+    } else {
+        PR_ASSERT(nfd == 0);
+        /*
+         * compute the new value of _PR_IOQ_TIMEOUT
+         */
+        q = _PR_IOQ(me->cpu).next;
+        _PR_IOQ_MAX_OSFD(me->cpu) = -1;
+        _PR_IOQ_TIMEOUT(me->cpu) = PR_INTERVAL_NO_TIMEOUT;
+        while (q != &_PR_IOQ(me->cpu)) {
+            PRPollQueue *pq = _PR_POLLQUEUE_PTR(q);
+            _PRUnixPollDesc *pds = pq->pds;
+            _PRUnixPollDesc *epds = pds + pq->npds;
+            PRInt32 pq_max_osfd = -1;
+
+            q = q->next;
+            for (; pds < epds; pds++) {
+                if (pds->osfd > pq_max_osfd) {
+                    pq_max_osfd = pds->osfd;
+                }
+            }
+            if (pq->timeout < _PR_IOQ_TIMEOUT(me->cpu))
+                _PR_IOQ_TIMEOUT(me->cpu) = pq->timeout;
+            if (_PR_IOQ_MAX_OSFD(me->cpu) < pq_max_osfd)
+                _PR_IOQ_MAX_OSFD(me->cpu) = pq_max_osfd;
+        }
+        if (_PR_IS_NATIVE_THREAD_SUPPORTED()) {
+            if (_PR_IOQ_MAX_OSFD(me->cpu) < _pr_md_pipefd[0])
+                _PR_IOQ_MAX_OSFD(me->cpu) = _pr_md_pipefd[0];
+        }
+    }
+#endif  /* _PR_USE_POLL */
+    _PR_MD_IOQ_UNLOCK();
+}
+
+void _MD_Wakeup_CPUs()
+{
+    PRInt32 rv, data;
+
+    data = 0;
+    rv = write(_pr_md_pipefd[1], &data, 1);
+
+    while ((rv < 0) && (errno == EAGAIN)) {
+        /*
+         * pipe full, read all data in pipe to empty it
+         */
+        while ((rv =
+            read(_pr_md_pipefd[0], _pr_md_pipebuf, PIPE_BUF))
+            == PIPE_BUF) {
+        }
+        PR_ASSERT((rv > 0) ||
+            ((rv == -1) && (errno == EAGAIN)));
+        rv = write(_pr_md_pipefd[1], &data, 1);
+    }
+}
+
+
+void _MD_InitCPUS()
+{
+    PRInt32 rv, flags;
+    PRThread *me = _MD_CURRENT_THREAD();
+
+    rv = pipe(_pr_md_pipefd);
+    PR_ASSERT(rv == 0);
+    _PR_IOQ_MAX_OSFD(me->cpu) = _pr_md_pipefd[0];
+#ifndef _PR_USE_POLL
+    FD_SET(_pr_md_pipefd[0], &_PR_FD_READ_SET(me->cpu));
+#endif
+
+    flags = fcntl(_pr_md_pipefd[0], F_GETFL, 0);
+    fcntl(_pr_md_pipefd[0], F_SETFL, flags | O_NONBLOCK);
+    flags = fcntl(_pr_md_pipefd[1], F_GETFL, 0);
+    fcntl(_pr_md_pipefd[1], F_SETFL, flags | O_NONBLOCK);
+}
+
+/*
+** Unix SIGALRM (clock) signal handler
+*/
+static void ClockInterruptHandler()
+{
+    int olderrno;
+    PRUintn pri;
+    _PRCPU *cpu = _PR_MD_CURRENT_CPU();
+    PRThread *me = _MD_CURRENT_THREAD();
+
+#ifdef SOLARIS
+    if (!me || _PR_IS_NATIVE_THREAD(me)) {
+        _pr_primordialCPU->u.missed[_pr_primordialCPU->where] |= _PR_MISSED_CLOCK;
+        return;
+    }
+#endif
+
+    if (_PR_MD_GET_INTSOFF() != 0) {
+        cpu->u.missed[cpu->where] |= _PR_MISSED_CLOCK;
+        return;
+    }
+    _PR_MD_SET_INTSOFF(1);
+
+    olderrno = errno;
+    _PR_ClockInterrupt();
+    errno = olderrno;
+
+    /*
+    ** If the interrupt wants a resched or if some other thread at
+    ** the same priority needs the cpu, reschedule.
+    */
+    pri = me->priority;
+    if ((cpu->u.missed[3] || (_PR_RUNQREADYMASK(me->cpu) >> pri))) {
+#ifdef _PR_NO_PREEMPT
+        cpu->resched = PR_TRUE;
+        if (pr_interruptSwitchHook) {
+            (*pr_interruptSwitchHook)(pr_interruptSwitchHookArg);
+        }
+#else /* _PR_NO_PREEMPT */
+        /*
+    ** Re-enable unix interrupts (so that we can use
+    ** setjmp/longjmp for context switching without having to
+    ** worry about the signal state)
+    */
+        sigprocmask(SIG_SETMASK, &empty_set, 0);
+        PR_LOG(_pr_sched_lm, PR_LOG_MIN, ("clock caused context switch"));
+
+        if(!(me->flags & _PR_IDLE_THREAD)) {
+            _PR_THREAD_LOCK(me);
+            me->state = _PR_RUNNABLE;
+            me->cpu = cpu;
+            _PR_RUNQ_LOCK(cpu);
+            _PR_ADD_RUNQ(me, cpu, pri);
+            _PR_RUNQ_UNLOCK(cpu);
+            _PR_THREAD_UNLOCK(me);
+        } else
+            me->state = _PR_RUNNABLE;
+        _MD_SWITCH_CONTEXT(me);
+        PR_LOG(_pr_sched_lm, PR_LOG_MIN, ("clock back from context switch"));
+#endif /* _PR_NO_PREEMPT */
+    }
+    /*
+     * Because this thread could be running on a different cpu after
+     * a context switch the current cpu should be accessed and the
+     * value of the 'cpu' variable should not be used.
+     */
+    _PR_MD_SET_INTSOFF(0);
+}
+
+/*
+ * On HP-UX 9, we have to use the sigvector() interface to restart
+ * interrupted system calls, because sigaction() does not have the
+ * SA_RESTART flag.
+ */
+
+#ifdef HPUX9
+static void HPUX9_ClockInterruptHandler(
+    int sig,
+    int code,
+    struct sigcontext *scp)
+{
+    ClockInterruptHandler();
+    scp->sc_syscall_action = SIG_RESTART;
+}
+#endif /* HPUX9 */
+
+/* # of milliseconds per clock tick that we will use */
+#define MSEC_PER_TICK    50
+
+
+void _MD_StartInterrupts()
+{
+    char *eval;
+
+    if ((eval = getenv("NSPR_NOCLOCK")) != NULL) {
+        if (atoi(eval) == 0)
+            _nspr_noclock = 0;
+        else
+            _nspr_noclock = 1;
+    }
+
+#ifndef _PR_NO_CLOCK_TIMER
+    if (!_nspr_noclock) {
+        _MD_EnableClockInterrupts();
+    }
+#endif
+}
+
+void _MD_StopInterrupts()
+{
+    sigprocmask(SIG_BLOCK, &timer_set, 0);
+}
+
+void _MD_EnableClockInterrupts()
+{
+    struct itimerval itval;
+    extern PRUintn _pr_numCPU;
+#ifdef HPUX9
+    struct sigvec vec;
+
+    vec.sv_handler = (void (*)()) HPUX9_ClockInterruptHandler;
+    vec.sv_mask = 0;
+    vec.sv_flags = 0;
+    sigvector(SIGALRM, &vec, 0);
+#else
+    struct sigaction vtact;
+
+    vtact.sa_handler = (void (*)()) ClockInterruptHandler;
+    sigemptyset(&vtact.sa_mask);
+    vtact.sa_flags = SA_RESTART;
+    sigaction(SIGALRM, &vtact, 0);
+#endif /* HPUX9 */
+
+    PR_ASSERT(_pr_numCPU == 1);
+	itval.it_interval.tv_sec = 0;
+	itval.it_interval.tv_usec = MSEC_PER_TICK * PR_USEC_PER_MSEC;
+	itval.it_value = itval.it_interval;
+	setitimer(ITIMER_REAL, &itval, 0);
+}
+
+void _MD_DisableClockInterrupts()
+{
+    struct itimerval itval;
+    extern PRUintn _pr_numCPU;
+
+    PR_ASSERT(_pr_numCPU == 1);
+	itval.it_interval.tv_sec = 0;
+	itval.it_interval.tv_usec = 0;
+	itval.it_value = itval.it_interval;
+	setitimer(ITIMER_REAL, &itval, 0);
+}
+
+void _MD_BlockClockInterrupts()
+{
+    sigprocmask(SIG_BLOCK, &timer_set, 0);
+}
+
+void _MD_UnblockClockInterrupts()
+{
+    sigprocmask(SIG_UNBLOCK, &timer_set, 0);
+}
+
+void _MD_MakeNonblock(PRFileDesc *fd)
+{
+    PRInt32 osfd = fd->secret->md.osfd;
+    int flags;
+
+    if (osfd <= 2) {
+        /* Don't mess around with stdin, stdout or stderr */
+        return;
+    }
+    flags = fcntl(osfd, F_GETFL, 0);
+
+    /*
+     * Use O_NONBLOCK (POSIX-style non-blocking I/O) whenever possible.
+     * On SunOS 4, we must use FNDELAY (BSD-style non-blocking I/O),
+     * otherwise connect() still blocks and can be interrupted by SIGALRM.
+     */
+
+    fcntl(osfd, F_SETFL, flags | O_NONBLOCK);
+    }
+
+PRInt32 _MD_open(const char *name, PRIntn flags, PRIntn mode)
+{
+    PRInt32 osflags;
+    PRInt32 rv, err;
+
+    if (flags & PR_RDWR) {
+        osflags = O_RDWR;
+    } else if (flags & PR_WRONLY) {
+        osflags = O_WRONLY;
+    } else {
+        osflags = O_RDONLY;
+    }
+
+    if (flags & PR_EXCL)
+        osflags |= O_EXCL;
+    if (flags & PR_APPEND)
+        osflags |= O_APPEND;
+    if (flags & PR_TRUNCATE)
+        osflags |= O_TRUNC;
+    if (flags & PR_SYNC) {
+#if defined(O_SYNC)
+        osflags |= O_SYNC;
+#elif defined(O_FSYNC)
+        osflags |= O_FSYNC;
+#else
+#error "Neither O_SYNC nor O_FSYNC is defined on this platform"
+#endif
+    }
+
+    /*
+    ** On creations we hold the 'create' lock in order to enforce
+    ** the semantics of PR_Rename. (see the latter for more details)
+    */
+    if (flags & PR_CREATE_FILE)
+    {
+        osflags |= O_CREAT;
+        if (NULL !=_pr_rename_lock)
+            PR_Lock(_pr_rename_lock);
+    }
+
+#if defined(ANDROID)
+    osflags |= O_LARGEFILE;
+#endif
+
+    rv = _md_iovector._open64(name, osflags, mode);
+
+    if (rv < 0) {
+        err = _MD_ERRNO();
+        _PR_MD_MAP_OPEN_ERROR(err);
+    }
+
+    if ((flags & PR_CREATE_FILE) && (NULL !=_pr_rename_lock))
+        PR_Unlock(_pr_rename_lock);
+    return rv;
+}
+
+PRIntervalTime intr_timeout_ticks;
+
+#if defined(SOLARIS) || defined(IRIX)
+static void sigsegvhandler() {
+    fprintf(stderr,"Received SIGSEGV\n");
+    fflush(stderr);
+    pause();
+}
+
+static void sigaborthandler() {
+    fprintf(stderr,"Received SIGABRT\n");
+    fflush(stderr);
+    pause();
+}
+
+static void sigbushandler() {
+    fprintf(stderr,"Received SIGBUS\n");
+    fflush(stderr);
+    pause();
+}
+#endif /* SOLARIS, IRIX */
+
+#endif  /* !defined(_PR_PTHREADS) */
+
+void _MD_query_fd_inheritable(PRFileDesc *fd)
+{
+    int flags;
+
+    PR_ASSERT(_PR_TRI_UNKNOWN == fd->secret->inheritable);
+    flags = fcntl(fd->secret->md.osfd, F_GETFD, 0);
+    PR_ASSERT(-1 != flags);
+    fd->secret->inheritable = (flags & FD_CLOEXEC) ?
+        _PR_TRI_FALSE : _PR_TRI_TRUE;
+}
+
+PROffset32 _MD_lseek(PRFileDesc *fd, PROffset32 offset, PRSeekWhence whence)
+{
+    PROffset32 rv, where;
+
+    switch (whence) {
+        case PR_SEEK_SET:
+            where = SEEK_SET;
+            break;
+        case PR_SEEK_CUR:
+            where = SEEK_CUR;
+            break;
+        case PR_SEEK_END:
+            where = SEEK_END;
+            break;
+        default:
+            PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+            rv = -1;
+            goto done;
+    }
+    rv = lseek(fd->secret->md.osfd,offset,where);
+    if (rv == -1)
+    {
+        PRInt32 syserr = _MD_ERRNO();
+        _PR_MD_MAP_LSEEK_ERROR(syserr);
+    }
+done:
+    return(rv);
+}
+
+PROffset64 _MD_lseek64(PRFileDesc *fd, PROffset64 offset, PRSeekWhence whence)
+{
+    PRInt32 where;
+    PROffset64 rv;
+
+    switch (whence)
+    {
+        case PR_SEEK_SET:
+            where = SEEK_SET;
+            break;
+        case PR_SEEK_CUR:
+            where = SEEK_CUR;
+            break;
+        case PR_SEEK_END:
+            where = SEEK_END;
+            break;
+        default:
+            PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+            rv = minus_one;
+            goto done;
+    }
+    rv = _md_iovector._lseek64(fd->secret->md.osfd, offset, where);
+    if (LL_EQ(rv, minus_one))
+    {
+        PRInt32 syserr = _MD_ERRNO();
+        _PR_MD_MAP_LSEEK_ERROR(syserr);
+    }
+done:
+    return rv;
+}  /* _MD_lseek64 */
+
+/*
+** _MD_set_fileinfo_times --
+**     Set the modifyTime and creationTime of the PRFileInfo
+**     structure using the values in struct stat.
+**
+** _MD_set_fileinfo64_times --
+**     Set the modifyTime and creationTime of the PRFileInfo64
+**     structure using the values in _MDStat64.
+*/
+
+#if defined(_PR_STAT_HAS_ST_ATIM)
+/*
+** struct stat has st_atim, st_mtim, and st_ctim fields of
+** type timestruc_t.
+*/
+static void _MD_set_fileinfo_times(
+    const struct stat *sb,
+    PRFileInfo *info)
+{
+    PRInt64 us, s2us;
+
+    LL_I2L(s2us, PR_USEC_PER_SEC);
+    LL_I2L(info->modifyTime, sb->st_mtim.tv_sec);
+    LL_MUL(info->modifyTime, info->modifyTime, s2us);
+    LL_I2L(us, sb->st_mtim.tv_nsec / 1000);
+    LL_ADD(info->modifyTime, info->modifyTime, us);
+    LL_I2L(info->creationTime, sb->st_ctim.tv_sec);
+    LL_MUL(info->creationTime, info->creationTime, s2us);
+    LL_I2L(us, sb->st_ctim.tv_nsec / 1000);
+    LL_ADD(info->creationTime, info->creationTime, us);
+}
+
+static void _MD_set_fileinfo64_times(
+    const _MDStat64 *sb,
+    PRFileInfo64 *info)
+{
+    PRInt64 us, s2us;
+
+    LL_I2L(s2us, PR_USEC_PER_SEC);
+    LL_I2L(info->modifyTime, sb->st_mtim.tv_sec);
+    LL_MUL(info->modifyTime, info->modifyTime, s2us);
+    LL_I2L(us, sb->st_mtim.tv_nsec / 1000);
+    LL_ADD(info->modifyTime, info->modifyTime, us);
+    LL_I2L(info->creationTime, sb->st_ctim.tv_sec);
+    LL_MUL(info->creationTime, info->creationTime, s2us);
+    LL_I2L(us, sb->st_ctim.tv_nsec / 1000);
+    LL_ADD(info->creationTime, info->creationTime, us);
+}
+#elif defined(_PR_STAT_HAS_ST_ATIM_UNION)
+/*
+** The st_atim, st_mtim, and st_ctim fields in struct stat are
+** unions with a st__tim union member of type timestruc_t.
+*/
+static void _MD_set_fileinfo_times(
+    const struct stat *sb,
+    PRFileInfo *info)
+{
+    PRInt64 us, s2us;
+
+    LL_I2L(s2us, PR_USEC_PER_SEC);
+    LL_I2L(info->modifyTime, sb->st_mtim.st__tim.tv_sec);
+    LL_MUL(info->modifyTime, info->modifyTime, s2us);
+    LL_I2L(us, sb->st_mtim.st__tim.tv_nsec / 1000);
+    LL_ADD(info->modifyTime, info->modifyTime, us);
+    LL_I2L(info->creationTime, sb->st_ctim.st__tim.tv_sec);
+    LL_MUL(info->creationTime, info->creationTime, s2us);
+    LL_I2L(us, sb->st_ctim.st__tim.tv_nsec / 1000);
+    LL_ADD(info->creationTime, info->creationTime, us);
+}
+
+static void _MD_set_fileinfo64_times(
+    const _MDStat64 *sb,
+    PRFileInfo64 *info)
+{
+    PRInt64 us, s2us;
+
+    LL_I2L(s2us, PR_USEC_PER_SEC);
+    LL_I2L(info->modifyTime, sb->st_mtim.st__tim.tv_sec);
+    LL_MUL(info->modifyTime, info->modifyTime, s2us);
+    LL_I2L(us, sb->st_mtim.st__tim.tv_nsec / 1000);
+    LL_ADD(info->modifyTime, info->modifyTime, us);
+    LL_I2L(info->creationTime, sb->st_ctim.st__tim.tv_sec);
+    LL_MUL(info->creationTime, info->creationTime, s2us);
+    LL_I2L(us, sb->st_ctim.st__tim.tv_nsec / 1000);
+    LL_ADD(info->creationTime, info->creationTime, us);
+}
+#elif defined(_PR_STAT_HAS_ST_ATIMESPEC)
+/*
+** struct stat has st_atimespec, st_mtimespec, and st_ctimespec
+** fields of type struct timespec.
+*/
+#if defined(_PR_TIMESPEC_HAS_TS_SEC)
+static void _MD_set_fileinfo_times(
+    const struct stat *sb,
+    PRFileInfo *info)
+{
+    PRInt64 us, s2us;
+
+    LL_I2L(s2us, PR_USEC_PER_SEC);
+    LL_I2L(info->modifyTime, sb->st_mtimespec.ts_sec);
+    LL_MUL(info->modifyTime, info->modifyTime, s2us);
+    LL_I2L(us, sb->st_mtimespec.ts_nsec / 1000);
+    LL_ADD(info->modifyTime, info->modifyTime, us);
+    LL_I2L(info->creationTime, sb->st_ctimespec.ts_sec);
+    LL_MUL(info->creationTime, info->creationTime, s2us);
+    LL_I2L(us, sb->st_ctimespec.ts_nsec / 1000);
+    LL_ADD(info->creationTime, info->creationTime, us);
+}
+
+static void _MD_set_fileinfo64_times(
+    const _MDStat64 *sb,
+    PRFileInfo64 *info)
+{
+    PRInt64 us, s2us;
+
+    LL_I2L(s2us, PR_USEC_PER_SEC);
+    LL_I2L(info->modifyTime, sb->st_mtimespec.ts_sec);
+    LL_MUL(info->modifyTime, info->modifyTime, s2us);
+    LL_I2L(us, sb->st_mtimespec.ts_nsec / 1000);
+    LL_ADD(info->modifyTime, info->modifyTime, us);
+    LL_I2L(info->creationTime, sb->st_ctimespec.ts_sec);
+    LL_MUL(info->creationTime, info->creationTime, s2us);
+    LL_I2L(us, sb->st_ctimespec.ts_nsec / 1000);
+    LL_ADD(info->creationTime, info->creationTime, us);
+}
+#else /* _PR_TIMESPEC_HAS_TS_SEC */
+/*
+** The POSIX timespec structure has tv_sec and tv_nsec.
+*/
+static void _MD_set_fileinfo_times(
+    const struct stat *sb,
+    PRFileInfo *info)
+{
+    PRInt64 us, s2us;
+
+    LL_I2L(s2us, PR_USEC_PER_SEC);
+    LL_I2L(info->modifyTime, sb->st_mtimespec.tv_sec);
+    LL_MUL(info->modifyTime, info->modifyTime, s2us);
+    LL_I2L(us, sb->st_mtimespec.tv_nsec / 1000);
+    LL_ADD(info->modifyTime, info->modifyTime, us);
+    LL_I2L(info->creationTime, sb->st_ctimespec.tv_sec);
+    LL_MUL(info->creationTime, info->creationTime, s2us);
+    LL_I2L(us, sb->st_ctimespec.tv_nsec / 1000);
+    LL_ADD(info->creationTime, info->creationTime, us);
+}
+
+static void _MD_set_fileinfo64_times(
+    const _MDStat64 *sb,
+    PRFileInfo64 *info)
+{
+    PRInt64 us, s2us;
+
+    LL_I2L(s2us, PR_USEC_PER_SEC);
+    LL_I2L(info->modifyTime, sb->st_mtimespec.tv_sec);
+    LL_MUL(info->modifyTime, info->modifyTime, s2us);
+    LL_I2L(us, sb->st_mtimespec.tv_nsec / 1000);
+    LL_ADD(info->modifyTime, info->modifyTime, us);
+    LL_I2L(info->creationTime, sb->st_ctimespec.tv_sec);
+    LL_MUL(info->creationTime, info->creationTime, s2us);
+    LL_I2L(us, sb->st_ctimespec.tv_nsec / 1000);
+    LL_ADD(info->creationTime, info->creationTime, us);
+}
+#endif /* _PR_TIMESPEC_HAS_TS_SEC */
+#elif defined(_PR_STAT_HAS_ONLY_ST_ATIME)
+/*
+** struct stat only has st_atime, st_mtime, and st_ctime fields
+** of type time_t.
+*/
+static void _MD_set_fileinfo_times(
+    const struct stat *sb,
+    PRFileInfo *info)
+{
+    PRInt64 s, s2us;
+    LL_I2L(s2us, PR_USEC_PER_SEC);
+    LL_I2L(s, sb->st_mtime);
+    LL_MUL(s, s, s2us);
+    info->modifyTime = s;
+    LL_I2L(s, sb->st_ctime);
+    LL_MUL(s, s, s2us);
+    info->creationTime = s;
+}
+
+static void _MD_set_fileinfo64_times(
+    const _MDStat64 *sb,
+    PRFileInfo64 *info)
+{
+    PRInt64 s, s2us;
+    LL_I2L(s2us, PR_USEC_PER_SEC);
+    LL_I2L(s, sb->st_mtime);
+    LL_MUL(s, s, s2us);
+    info->modifyTime = s;
+    LL_I2L(s, sb->st_ctime);
+    LL_MUL(s, s, s2us);
+    info->creationTime = s;
+}
+#else
+#error "I don't know yet"
+#endif
+
+static int _MD_convert_stat_to_fileinfo(
+    const struct stat *sb,
+    PRFileInfo *info)
+{
+    if (S_IFREG & sb->st_mode)
+        info->type = PR_FILE_FILE;
+    else if (S_IFDIR & sb->st_mode)
+        info->type = PR_FILE_DIRECTORY;
+    else
+        info->type = PR_FILE_OTHER;
+
+#if defined(_PR_HAVE_LARGE_OFF_T)
+    if (0x7fffffffL < sb->st_size)
+    {
+        PR_SetError(PR_FILE_TOO_BIG_ERROR, 0);
+        return -1;
+    }
+#endif /* defined(_PR_HAVE_LARGE_OFF_T) */
+    info->size = sb->st_size;
+
+    _MD_set_fileinfo_times(sb, info);
+    return 0;
+}  /* _MD_convert_stat_to_fileinfo */
+
+static int _MD_convert_stat64_to_fileinfo64(
+    const _MDStat64 *sb,
+    PRFileInfo64 *info)
+{
+    if (S_IFREG & sb->st_mode)
+        info->type = PR_FILE_FILE;
+    else if (S_IFDIR & sb->st_mode)
+        info->type = PR_FILE_DIRECTORY;
+    else
+        info->type = PR_FILE_OTHER;
+
+    LL_I2L(info->size, sb->st_size);
+
+    _MD_set_fileinfo64_times(sb, info);
+    return 0;
+}  /* _MD_convert_stat64_to_fileinfo64 */
+
+PRInt32 _MD_getfileinfo(const char *fn, PRFileInfo *info)
+{
+    PRInt32 rv;
+    struct stat sb;
+
+    rv = stat(fn, &sb);
+    if (rv < 0)
+        _PR_MD_MAP_STAT_ERROR(_MD_ERRNO());
+    else if (NULL != info)
+        rv = _MD_convert_stat_to_fileinfo(&sb, info);
+    return rv;
+}
+
+PRInt32 _MD_getfileinfo64(const char *fn, PRFileInfo64 *info)
+{
+    _MDStat64 sb;
+    PRInt32 rv = _md_iovector._stat64(fn, &sb);
+    if (rv < 0)
+        _PR_MD_MAP_STAT_ERROR(_MD_ERRNO());
+    else if (NULL != info)
+        rv = _MD_convert_stat64_to_fileinfo64(&sb, info);
+    return rv;
+}
+
+PRInt32 _MD_getopenfileinfo(const PRFileDesc *fd, PRFileInfo *info)
+{
+    struct stat sb;
+    PRInt32 rv = fstat(fd->secret->md.osfd, &sb);
+    if (rv < 0)
+        _PR_MD_MAP_FSTAT_ERROR(_MD_ERRNO());
+    else if (NULL != info)
+        rv = _MD_convert_stat_to_fileinfo(&sb, info);
+    return rv;
+}
+
+PRInt32 _MD_getopenfileinfo64(const PRFileDesc *fd, PRFileInfo64 *info)
+{
+    _MDStat64 sb;
+    PRInt32 rv = _md_iovector._fstat64(fd->secret->md.osfd, &sb);
+    if (rv < 0)
+        _PR_MD_MAP_FSTAT_ERROR(_MD_ERRNO());
+    else if (NULL != info)
+        rv = _MD_convert_stat64_to_fileinfo64(&sb, info);
+    return rv;
+}
+
+/*
+ * _md_iovector._open64 must be initialized to 'open' so that _PR_InitLog can
+ * open the log file during NSPR initialization, before _md_iovector is
+ * initialized by _PR_MD_FINAL_INIT.  This means the log file cannot be a
+ * large file on some platforms.
+ */
+#ifdef SYMBIAN
+struct _MD_IOVector _md_iovector; /* Will crash if NSPR_LOG_FILE is set. */
+#else
+struct _MD_IOVector _md_iovector = { open };
+#endif
+
+/*
+** These implementations are to emulate large file routines on systems that
+** don't have them. Their goal is to check in case overflow occurs. Otherwise
+** they will just operate as normal using 32-bit file routines.
+**
+** The checking might be pre- or post-op, depending on the semantics.
+*/
+
+#if defined(SOLARIS2_5)
+
+static PRIntn _MD_solaris25_fstat64(PRIntn osfd, _MDStat64 *buf)
+{
+    PRInt32 rv;
+    struct stat sb;
+
+    rv = fstat(osfd, &sb);
+    if (rv >= 0)
+    {
+        /*
+        ** I'm only copying the fields that are immediately needed.
+        ** If somebody else calls this function, some of the fields
+        ** may not be defined.
+        */
+        (void)memset(buf, 0, sizeof(_MDStat64));
+        buf->st_mode = sb.st_mode;
+        buf->st_ctim = sb.st_ctim;
+        buf->st_mtim = sb.st_mtim;
+        buf->st_size = sb.st_size;
+    }
+    return rv;
+}  /* _MD_solaris25_fstat64 */
+
+static PRIntn _MD_solaris25_stat64(const char *fn, _MDStat64 *buf)
+{
+    PRInt32 rv;
+    struct stat sb;
+
+    rv = stat(fn, &sb);
+    if (rv >= 0)
+    {
+        /*
+        ** I'm only copying the fields that are immediately needed.
+        ** If somebody else calls this function, some of the fields
+        ** may not be defined.
+        */
+        (void)memset(buf, 0, sizeof(_MDStat64));
+        buf->st_mode = sb.st_mode;
+        buf->st_ctim = sb.st_ctim;
+        buf->st_mtim = sb.st_mtim;
+        buf->st_size = sb.st_size;
+    }
+    return rv;
+}  /* _MD_solaris25_stat64 */
+#endif /* defined(SOLARIS2_5) */
+
+#if defined(_PR_NO_LARGE_FILES) || defined(SOLARIS2_5)
+
+static PROffset64 _MD_Unix_lseek64(PRIntn osfd, PROffset64 offset, PRIntn whence)
+{
+    PRUint64 maxoff;
+    PROffset64 rv = minus_one;
+    LL_I2L(maxoff, 0x7fffffff);
+    if (LL_CMP(offset, <=, maxoff))
+    {
+        off_t off;
+        LL_L2I(off, offset);
+        LL_I2L(rv, lseek(osfd, off, whence));
+    }
+    else errno = EFBIG;  /* we can't go there */
+    return rv;
+}  /* _MD_Unix_lseek64 */
+
+static void* _MD_Unix_mmap64(
+    void *addr, PRSize len, PRIntn prot, PRIntn flags,
+    PRIntn fildes, PRInt64 offset)
+{
+    PR_SetError(PR_FILE_TOO_BIG_ERROR, 0);
+    return NULL;
+}  /* _MD_Unix_mmap64 */
+#endif /* defined(_PR_NO_LARGE_FILES) || defined(SOLARIS2_5) */
+
+/* Android <= 19 doesn't have mmap64. */
+#if defined(ANDROID) && __ANDROID_API__ <= 19
+PR_IMPORT(void) *__mmap2(void *, size_t, int, int, int, size_t);
+
+#define ANDROID_PAGE_SIZE 4096
+
+static void *
+mmap64(void *addr, size_t len, int prot, int flags, int fd, loff_t offset)
+{
+    if (offset & (ANDROID_PAGE_SIZE - 1)) {
+        errno = EINVAL;
+        return MAP_FAILED;
+    }
+    return __mmap2(addr, len, prot, flags, fd, offset / ANDROID_PAGE_SIZE);
+}
+#endif
+
+#if defined(OSF1) && defined(__GNUC__)
+
+/*
+ * On OSF1 V5.0A, <sys/stat.h> defines stat and fstat as
+ * macros when compiled under gcc, so it is rather tricky to
+ * take the addresses of the real functions the macros expend
+ * to.  A simple solution is to define forwarder functions
+ * and take the addresses of the forwarder functions instead.
+ */
+
+static int stat_forwarder(const char *path, struct stat *buffer)
+{
+    return stat(path, buffer);
+}
+
+static int fstat_forwarder(int filedes, struct stat *buffer)
+{
+    return fstat(filedes, buffer);
+}
+
+#endif
+
+static void _PR_InitIOV(void)
+{
+#if defined(SOLARIS2_5)
+    PRLibrary *lib;
+    void *open64_func;
+
+    open64_func = PR_FindSymbolAndLibrary("open64", &lib);
+    if (NULL != open64_func)
+    {
+        PR_ASSERT(NULL != lib);
+        _md_iovector._open64 = (_MD_Open64)open64_func;
+        _md_iovector._mmap64 = (_MD_Mmap64)PR_FindSymbol(lib, "mmap64");
+        _md_iovector._fstat64 = (_MD_Fstat64)PR_FindSymbol(lib, "fstat64");
+        _md_iovector._stat64 = (_MD_Stat64)PR_FindSymbol(lib, "stat64");
+        _md_iovector._lseek64 = (_MD_Lseek64)PR_FindSymbol(lib, "lseek64");
+        (void)PR_UnloadLibrary(lib);
+    }
+    else
+    {
+        _md_iovector._open64 = open;
+        _md_iovector._mmap64 = _MD_Unix_mmap64;
+        _md_iovector._fstat64 = _MD_solaris25_fstat64;
+        _md_iovector._stat64 = _MD_solaris25_stat64;
+        _md_iovector._lseek64 = _MD_Unix_lseek64;
+    }
+#elif defined(_PR_NO_LARGE_FILES)
+    _md_iovector._open64 = open;
+    _md_iovector._mmap64 = _MD_Unix_mmap64;
+    _md_iovector._fstat64 = fstat;
+    _md_iovector._stat64 = stat;
+    _md_iovector._lseek64 = _MD_Unix_lseek64;
+#elif defined(_PR_HAVE_OFF64_T)
+#if defined(IRIX5_3) || defined(ANDROID)
+    /*
+     * Android doesn't have open64.  We pass the O_LARGEFILE flag to open
+     * in _MD_open.
+     */
+    _md_iovector._open64 = open;
+#else
+    _md_iovector._open64 = open64;
+#endif
+    _md_iovector._mmap64 = mmap64;
+    _md_iovector._fstat64 = fstat64;
+    _md_iovector._stat64 = stat64;
+    _md_iovector._lseek64 = lseek64;
+#elif defined(_PR_HAVE_LARGE_OFF_T)
+    _md_iovector._open64 = open;
+    _md_iovector._mmap64 = mmap;
+#if defined(OSF1) && defined(__GNUC__)
+    _md_iovector._fstat64 = fstat_forwarder;
+    _md_iovector._stat64 = stat_forwarder;
+#else
+    _md_iovector._fstat64 = fstat;
+    _md_iovector._stat64 = stat;
+#endif
+    _md_iovector._lseek64 = lseek;
+#else
+#error "I don't know yet"
+#endif
+    LL_I2L(minus_one, -1);
+}  /* _PR_InitIOV */
+
+void _PR_UnixInit(void)
+{
+    struct sigaction sigact;
+    int rv;
+
+    sigemptyset(&timer_set);
+
+#if !defined(_PR_PTHREADS)
+
+    sigaddset(&timer_set, SIGALRM);
+    sigemptyset(&empty_set);
+    intr_timeout_ticks =
+            PR_SecondsToInterval(_PR_INTERRUPT_CHECK_INTERVAL_SECS);
+
+#if defined(SOLARIS) || defined(IRIX)
+
+    if (getenv("NSPR_SIGSEGV_HANDLE")) {
+        sigact.sa_handler = sigsegvhandler;
+        sigact.sa_flags = 0;
+        sigact.sa_mask = timer_set;
+        sigaction(SIGSEGV, &sigact, 0);
+    }
+
+    if (getenv("NSPR_SIGABRT_HANDLE")) {
+        sigact.sa_handler = sigaborthandler;
+        sigact.sa_flags = 0;
+        sigact.sa_mask = timer_set;
+        sigaction(SIGABRT, &sigact, 0);
+    }
+
+    if (getenv("NSPR_SIGBUS_HANDLE")) {
+        sigact.sa_handler = sigbushandler;
+        sigact.sa_flags = 0;
+        sigact.sa_mask = timer_set;
+        sigaction(SIGBUS, &sigact, 0);
+    }
+
+#endif
+#endif  /* !defined(_PR_PTHREADS) */
+
+    /*
+     * Under HP-UX DCE threads, sigaction() installs a per-thread
+     * handler, so we use sigvector() to install a process-wide
+     * handler.
+     */
+#if defined(HPUX) && defined(_PR_DCETHREADS)
+    {
+        struct sigvec vec;
+
+        vec.sv_handler = SIG_IGN;
+        vec.sv_mask = 0;
+        vec.sv_flags = 0;
+        rv = sigvector(SIGPIPE, &vec, NULL);
+        PR_ASSERT(0 == rv);
+    }
+#else
+    sigact.sa_handler = SIG_IGN;
+    sigemptyset(&sigact.sa_mask);
+    sigact.sa_flags = 0;
+    rv = sigaction(SIGPIPE, &sigact, 0);
+    PR_ASSERT(0 == rv);
+#endif /* HPUX && _PR_DCETHREADS */
+
+    _pr_rename_lock = PR_NewLock();
+    PR_ASSERT(NULL != _pr_rename_lock);
+    _pr_Xfe_mon = PR_NewMonitor();
+    PR_ASSERT(NULL != _pr_Xfe_mon);
+
+    _PR_InitIOV();  /* one last hack */
+}
+
+void _PR_UnixCleanup(void)
+{
+    if (_pr_rename_lock) {
+        PR_DestroyLock(_pr_rename_lock);
+        _pr_rename_lock = NULL;
+    }
+    if (_pr_Xfe_mon) {
+        PR_DestroyMonitor(_pr_Xfe_mon);
+        _pr_Xfe_mon = NULL;
+    }
+}
+
+#if !defined(_PR_PTHREADS)
+
+/*
+ * Variables used by the GC code, initialized in _MD_InitSegs().
+ */
+static PRInt32 _pr_zero_fd = -1;
+static PRLock *_pr_md_lock = NULL;
+
+/*
+ * _MD_InitSegs --
+ *
+ * This is Unix's version of _PR_MD_INIT_SEGS(), which is
+ * called by _PR_InitSegs(), which in turn is called by
+ * PR_Init().
+ */
+void _MD_InitSegs(void)
+{
+#ifdef DEBUG
+    /*
+    ** Disable using mmap(2) if NSPR_NO_MMAP is set
+    */
+    if (getenv("NSPR_NO_MMAP")) {
+        _pr_zero_fd = -2;
+        return;
+    }
+#endif
+    _pr_zero_fd = open("/dev/zero",O_RDWR , 0);
+    /* Prevent the fd from being inherited by child processes */
+    fcntl(_pr_zero_fd, F_SETFD, FD_CLOEXEC);
+    _pr_md_lock = PR_NewLock();
+}
+
+PRStatus _MD_AllocSegment(PRSegment *seg, PRUint32 size, void *vaddr)
+{
+    static char *lastaddr = (char*) _PR_STACK_VMBASE;
+    PRStatus retval = PR_SUCCESS;
+    int prot;
+    void *rv;
+
+    PR_ASSERT(seg != 0);
+    PR_ASSERT(size != 0);
+
+    PR_Lock(_pr_md_lock);
+    if (_pr_zero_fd < 0) {
+from_heap:
+        seg->vaddr = PR_MALLOC(size);
+        if (!seg->vaddr) {
+            retval = PR_FAILURE;
+        }
+        else {
+            seg->size = size;
+        }
+        goto exit;
+    }
+
+    prot = PROT_READ|PROT_WRITE;
+    /*
+     * On Alpha Linux, the user-level thread stack needs
+     * to be made executable because longjmp/signal seem
+     * to put machine instructions on the stack.
+     */
+#if defined(LINUX) && defined(__alpha)
+    prot |= PROT_EXEC;
+#endif
+    rv = mmap((vaddr != 0) ? vaddr : lastaddr, size, prot,
+        _MD_MMAP_FLAGS,
+        _pr_zero_fd, 0);
+    if (rv == (void*)-1) {
+        goto from_heap;
+    }
+    lastaddr += size;
+    seg->vaddr = rv;
+    seg->size = size;
+    seg->flags = _PR_SEG_VM;
+
+exit:
+    PR_Unlock(_pr_md_lock);
+    return retval;
+}
+
+void _MD_FreeSegment(PRSegment *seg)
+{
+    if (seg->flags & _PR_SEG_VM)
+        (void) munmap(seg->vaddr, seg->size);
+    else
+        PR_DELETE(seg->vaddr);
+}
+
+#endif /* _PR_PTHREADS */
+
+/*
+ *-----------------------------------------------------------------------
+ *
+ * PR_Now --
+ *
+ *     Returns the current time in microseconds since the epoch.
+ *     The epoch is midnight January 1, 1970 GMT.
+ *     The implementation is machine dependent.  This is the Unix
+ *     implementation.
+ *     Cf. time_t time(time_t *tp)
+ *
+ *-----------------------------------------------------------------------
+ */
+
+PR_IMPLEMENT(PRTime)
+PR_Now(void)
+{
+    struct timeval tv;
+    PRInt64 s, us, s2us;
+
+    GETTIMEOFDAY(&tv);
+    LL_I2L(s2us, PR_USEC_PER_SEC);
+    LL_I2L(s, tv.tv_sec);
+    LL_I2L(us, tv.tv_usec);
+    LL_MUL(s, s, s2us);
+    LL_ADD(s, s, us);
+    return s;
+}
+
+#if defined(_MD_INTERVAL_USE_GTOD)
+/*
+ * This version of interval times is based on the time of day
+ * capability offered by the system. This isn't valid for two reasons:
+ * 1) The time of day is neither linear nor montonically increasing
+ * 2) The units here are milliseconds. That's not appropriate for our use.
+ */
+PRIntervalTime _PR_UNIX_GetInterval()
+{
+    struct timeval time;
+    PRIntervalTime ticks;
+
+    (void)GETTIMEOFDAY(&time);  /* fallicy of course */
+    ticks = (PRUint32)time.tv_sec * PR_MSEC_PER_SEC;  /* that's in milliseconds */
+    ticks += (PRUint32)time.tv_usec / PR_USEC_PER_MSEC;  /* so's that */
+    return ticks;
+}  /* _PR_UNIX_GetInterval */
+
+PRIntervalTime _PR_UNIX_TicksPerSecond()
+{
+    return 1000;  /* this needs some work :) */
+}
+#endif
+
+#if defined(_PR_HAVE_CLOCK_MONOTONIC)
+PRIntervalTime _PR_UNIX_GetInterval2()
+{
+    struct timespec time;
+    PRIntervalTime ticks;
+
+    if (clock_gettime(CLOCK_MONOTONIC, &time) != 0) {
+        fprintf(stderr, "clock_gettime failed: %d\n", errno);
+        abort();
+    }
+
+    ticks = (PRUint32)time.tv_sec * PR_MSEC_PER_SEC;
+    ticks += (PRUint32)time.tv_nsec / PR_NSEC_PER_MSEC;
+    return ticks;
+}
+
+PRIntervalTime _PR_UNIX_TicksPerSecond2()
+{
+    return 1000;
+}
+#endif
+
+#if !defined(_PR_PTHREADS)
+/*
+ * Wait for I/O on multiple descriptors.
+ *
+ * Return 0 if timed out, return -1 if interrupted,
+ * else return the number of ready descriptors.
+ */
+PRInt32 _PR_WaitForMultipleFDs(
+    _PRUnixPollDesc *unixpds,
+    PRInt32 pdcnt,
+    PRIntervalTime timeout)
+{
+    PRPollQueue pq;
+    PRIntn is;
+    PRInt32 rv;
+    _PRCPU *io_cpu;
+    _PRUnixPollDesc *unixpd, *eunixpd;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    PR_ASSERT(!(me->flags & _PR_IDLE_THREAD));
+
+    if (_PR_PENDING_INTERRUPT(me)) {
+        me->flags &= ~_PR_INTERRUPT;
+        PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+        return -1;
+    }
+
+    pq.pds = unixpds;
+    pq.npds = pdcnt;
+
+    _PR_INTSOFF(is);
+    _PR_MD_IOQ_LOCK();
+    _PR_THREAD_LOCK(me);
+
+    pq.thr = me;
+    io_cpu = me->cpu;
+    pq.on_ioq = PR_TRUE;
+    pq.timeout = timeout;
+    _PR_ADD_TO_IOQ(pq, me->cpu);
+
+#if !defined(_PR_USE_POLL)
+    eunixpd = unixpds + pdcnt;
+    for (unixpd = unixpds; unixpd < eunixpd; unixpd++) {
+        PRInt32 osfd = unixpd->osfd;
+        if (unixpd->in_flags & _PR_UNIX_POLL_READ) {
+            FD_SET(osfd, &_PR_FD_READ_SET(me->cpu));
+            _PR_FD_READ_CNT(me->cpu)[osfd]++;
+        }
+        if (unixpd->in_flags & _PR_UNIX_POLL_WRITE) {
+            FD_SET(osfd, &_PR_FD_WRITE_SET(me->cpu));
+            (_PR_FD_WRITE_CNT(me->cpu))[osfd]++;
+        }
+        if (unixpd->in_flags & _PR_UNIX_POLL_EXCEPT) {
+            FD_SET(osfd, &_PR_FD_EXCEPTION_SET(me->cpu));
+            (_PR_FD_EXCEPTION_CNT(me->cpu))[osfd]++;
+        }
+        if (osfd > _PR_IOQ_MAX_OSFD(me->cpu)) {
+            _PR_IOQ_MAX_OSFD(me->cpu) = osfd;
+        }
+    }
+#endif  /* !defined(_PR_USE_POLL) */
+
+    if (_PR_IOQ_TIMEOUT(me->cpu) > timeout) {
+        _PR_IOQ_TIMEOUT(me->cpu) = timeout;
+    }
+
+    _PR_IOQ_OSFD_CNT(me->cpu) += pdcnt;
+        
+    _PR_SLEEPQ_LOCK(me->cpu);
+    _PR_ADD_SLEEPQ(me, timeout);
+    me->state = _PR_IO_WAIT;
+    me->io_pending = PR_TRUE;
+    me->io_suspended = PR_FALSE;
+    _PR_SLEEPQ_UNLOCK(me->cpu);
+    _PR_THREAD_UNLOCK(me);
+    _PR_MD_IOQ_UNLOCK();
+
+    _PR_MD_WAIT(me, timeout);
+
+    me->io_pending = PR_FALSE;
+    me->io_suspended = PR_FALSE;
+
+    /*
+     * This thread should run on the same cpu on which it was blocked; when 
+     * the IO request times out the fd sets and fd counts for the
+     * cpu are updated below.
+     */
+    PR_ASSERT(me->cpu == io_cpu);
+
+    /*
+    ** If we timed out the pollq might still be on the ioq. Remove it
+    ** before continuing.
+    */
+    if (pq.on_ioq) {
+        _PR_MD_IOQ_LOCK();
+        /*
+         * Need to check pq.on_ioq again
+         */
+        if (pq.on_ioq) {
+            PR_REMOVE_LINK(&pq.links);
+#ifndef _PR_USE_POLL
+            eunixpd = unixpds + pdcnt;
+            for (unixpd = unixpds; unixpd < eunixpd; unixpd++) {
+                PRInt32 osfd = unixpd->osfd;
+                PRInt16 in_flags = unixpd->in_flags;
+
+                if (in_flags & _PR_UNIX_POLL_READ) {
+                    if (--(_PR_FD_READ_CNT(me->cpu))[osfd] == 0)
+                        FD_CLR(osfd, &_PR_FD_READ_SET(me->cpu));
+                }
+                if (in_flags & _PR_UNIX_POLL_WRITE) {
+                    if (--(_PR_FD_WRITE_CNT(me->cpu))[osfd] == 0)
+                        FD_CLR(osfd, &_PR_FD_WRITE_SET(me->cpu));
+                }
+                if (in_flags & _PR_UNIX_POLL_EXCEPT) {
+                    if (--(_PR_FD_EXCEPTION_CNT(me->cpu))[osfd] == 0)
+                        FD_CLR(osfd, &_PR_FD_EXCEPTION_SET(me->cpu));
+                }
+            }
+#endif  /* _PR_USE_POLL */
+            PR_ASSERT(pq.npds == pdcnt);
+            _PR_IOQ_OSFD_CNT(me->cpu) -= pdcnt;
+            PR_ASSERT(_PR_IOQ_OSFD_CNT(me->cpu) >= 0);
+        }
+        _PR_MD_IOQ_UNLOCK();
+    }
+    /* XXX Should we use _PR_FAST_INTSON or _PR_INTSON? */
+    if (1 == pdcnt) {
+        _PR_FAST_INTSON(is);
+    } else {
+        _PR_INTSON(is);
+    }
+
+    if (_PR_PENDING_INTERRUPT(me)) {
+        me->flags &= ~_PR_INTERRUPT;
+        PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+        return -1;
+    }
+
+    rv = 0;
+    if (pq.on_ioq == PR_FALSE) {
+        /* Count the number of ready descriptors */
+        while (--pdcnt >= 0) {
+            if (unixpds->out_flags != 0) {
+                rv++;
+            }
+            unixpds++;
+        }
+    }
+
+    return rv;
+}
+
+/*
+ * Unblock threads waiting for I/O
+ *    used when interrupting threads
+ *
+ * NOTE: The thread lock should held when this function is called.
+ * On return, the thread lock is released.
+ */
+void _PR_Unblock_IO_Wait(PRThread *thr)
+{
+    int pri = thr->priority;
+    _PRCPU *cpu = thr->cpu;
+ 
+    /*
+     * GLOBAL threads wakeup periodically to check for interrupt
+     */
+    if (_PR_IS_NATIVE_THREAD(thr)) {
+        _PR_THREAD_UNLOCK(thr); 
+        return;
+    }
+
+    PR_ASSERT(thr->flags & (_PR_ON_SLEEPQ | _PR_ON_PAUSEQ));
+    _PR_SLEEPQ_LOCK(cpu);
+    _PR_DEL_SLEEPQ(thr, PR_TRUE);
+    _PR_SLEEPQ_UNLOCK(cpu);
+
+    PR_ASSERT(!(thr->flags & _PR_IDLE_THREAD));
+    thr->state = _PR_RUNNABLE;
+    _PR_RUNQ_LOCK(cpu);
+    _PR_ADD_RUNQ(thr, cpu, pri);
+    _PR_RUNQ_UNLOCK(cpu);
+    _PR_THREAD_UNLOCK(thr);
+    _PR_MD_WAKEUP_WAITER(thr);
+}
+#endif  /* !defined(_PR_PTHREADS) */
+
+/*
+ * When a nonblocking connect has completed, determine whether it
+ * succeeded or failed, and if it failed, what the error code is.
+ *
+ * The function returns the error code.  An error code of 0 means
+ * that the nonblocking connect succeeded.
+ */
+
+int _MD_unix_get_nonblocking_connect_error(int osfd)
+{
+#if defined(NTO)
+    /* Neutrino does not support the SO_ERROR socket option */
+    PRInt32      rv;
+    PRNetAddr    addr;
+    _PRSockLen_t addrlen = sizeof(addr);
+
+    /* Test to see if we are using the Tiny TCP/IP Stack or the Full one. */
+    struct statvfs superblock;
+    rv = fstatvfs(osfd, &superblock);
+    if (rv == 0) {
+        if (strcmp(superblock.f_basetype, "ttcpip") == 0) {
+            /* Using the Tiny Stack! */
+            rv = getpeername(osfd, (struct sockaddr *) &addr,
+                    (_PRSockLen_t *) &addrlen);
+            if (rv == -1) {
+                int errno_copy = errno;    /* make a copy so I don't
+                                            * accidentally reset */
+
+                if (errno_copy == ENOTCONN) {
+                    struct stat StatInfo;
+                    rv = fstat(osfd, &StatInfo);
+                    if (rv == 0) {
+                        time_t current_time = time(NULL);
+
+                        /*
+                         * this is a real hack, can't explain why it
+                         * works it just does
+                         */
+                        if (abs(current_time - StatInfo.st_atime) < 5) {
+                            return ECONNREFUSED;
+                        } else {
+                            return ETIMEDOUT;
+                        }
+                    } else {
+                        return ECONNREFUSED;
+                    }
+                } else {
+                    return errno_copy;
+                }
+            } else {
+                /* No Error */
+                return 0;
+            }
+        } else {
+            /* Have the FULL Stack which supports SO_ERROR */
+            /* Hasn't been written yet, never been tested! */
+            /* Jerry.Kirk@Nexwarecorp.com */
+
+            int err;
+            _PRSockLen_t optlen = sizeof(err);
+
+            if (getsockopt(osfd, SOL_SOCKET, SO_ERROR,
+                    (char *) &err, &optlen) == -1) {
+                return errno;
+            } else {
+                return err;
+            }		
+        }
+    } else {
+        return ECONNREFUSED;
+    }	
+#elif defined(UNIXWARE)
+    /*
+     * getsockopt() fails with EPIPE, so use getmsg() instead.
+     */
+
+    int rv;
+    int flags = 0;
+    rv = getmsg(osfd, NULL, NULL, &flags);
+    PR_ASSERT(-1 == rv || 0 == rv);
+    if (-1 == rv && errno != EAGAIN && errno != EWOULDBLOCK) {
+        return errno;
+    }
+    return 0;  /* no error */
+#else
+    int err;
+    _PRSockLen_t optlen = sizeof(err);
+    if (getsockopt(osfd, SOL_SOCKET, SO_ERROR, (char *) &err, &optlen) == -1) {
+        return errno;
+    } else {
+        return err;
+    }
+#endif
+}
+
+/************************************************************************/
+
+/*
+** Special hacks for xlib. Xlib/Xt/Xm is not re-entrant nor is it thread
+** safe.  Unfortunately, neither is mozilla. To make these programs work
+** in a pre-emptive threaded environment, we need to use a lock.
+*/
+
+void PR_XLock(void)
+{
+    PR_EnterMonitor(_pr_Xfe_mon);
+}
+
+void PR_XUnlock(void)
+{
+    PR_ExitMonitor(_pr_Xfe_mon);
+}
+
+PRBool PR_XIsLocked(void)
+{
+    return (PR_InMonitor(_pr_Xfe_mon)) ? PR_TRUE : PR_FALSE;
+}
+
+void PR_XWait(int ms)
+{
+    PR_Wait(_pr_Xfe_mon, PR_MillisecondsToInterval(ms));
+}
+
+void PR_XNotify(void)
+{
+    PR_Notify(_pr_Xfe_mon);
+}
+
+void PR_XNotifyAll(void)
+{
+    PR_NotifyAll(_pr_Xfe_mon);
+}
+
+#if defined(HAVE_FCNTL_FILE_LOCKING)
+
+PRStatus
+_MD_LockFile(PRInt32 f)
+{
+    PRInt32 rv;
+    struct flock arg;
+
+    arg.l_type = F_WRLCK;
+    arg.l_whence = SEEK_SET;
+    arg.l_start = 0;
+    arg.l_len = 0;  /* until EOF */
+    rv = fcntl(f, F_SETLKW, &arg);
+    if (rv == 0)
+        return PR_SUCCESS;
+    _PR_MD_MAP_FLOCK_ERROR(_MD_ERRNO());
+    return PR_FAILURE;
+}
+
+PRStatus
+_MD_TLockFile(PRInt32 f)
+{
+    PRInt32 rv;
+    struct flock arg;
+
+    arg.l_type = F_WRLCK;
+    arg.l_whence = SEEK_SET;
+    arg.l_start = 0;
+    arg.l_len = 0;  /* until EOF */
+    rv = fcntl(f, F_SETLK, &arg);
+    if (rv == 0)
+        return PR_SUCCESS;
+    _PR_MD_MAP_FLOCK_ERROR(_MD_ERRNO());
+    return PR_FAILURE;
+}
+
+PRStatus
+_MD_UnlockFile(PRInt32 f)
+{
+    PRInt32 rv;
+    struct flock arg;
+
+    arg.l_type = F_UNLCK;
+    arg.l_whence = SEEK_SET;
+    arg.l_start = 0;
+    arg.l_len = 0;  /* until EOF */
+    rv = fcntl(f, F_SETLK, &arg);
+    if (rv == 0)
+        return PR_SUCCESS;
+    _PR_MD_MAP_FLOCK_ERROR(_MD_ERRNO());
+    return PR_FAILURE;
+}
+
+#elif defined(HAVE_BSD_FLOCK)
+
+#include <sys/file.h>
+
+PRStatus
+_MD_LockFile(PRInt32 f)
+{
+    PRInt32 rv;
+    rv = flock(f, LOCK_EX);
+    if (rv == 0)
+        return PR_SUCCESS;
+    _PR_MD_MAP_FLOCK_ERROR(_MD_ERRNO());
+    return PR_FAILURE;
+}
+
+PRStatus
+_MD_TLockFile(PRInt32 f)
+{
+    PRInt32 rv;
+    rv = flock(f, LOCK_EX|LOCK_NB);
+    if (rv == 0)
+        return PR_SUCCESS;
+    _PR_MD_MAP_FLOCK_ERROR(_MD_ERRNO());
+    return PR_FAILURE;
+}
+
+PRStatus
+_MD_UnlockFile(PRInt32 f)
+{
+    PRInt32 rv;
+    rv = flock(f, LOCK_UN);
+    if (rv == 0)
+        return PR_SUCCESS;
+    _PR_MD_MAP_FLOCK_ERROR(_MD_ERRNO());
+    return PR_FAILURE;
+}
+#else
+
+PRStatus
+_MD_LockFile(PRInt32 f)
+{
+    PRInt32 rv;
+    rv = lockf(f, F_LOCK, 0);
+    if (rv == 0)
+        return PR_SUCCESS;
+    _PR_MD_MAP_LOCKF_ERROR(_MD_ERRNO());
+    return PR_FAILURE;
+}
+
+PRStatus
+_MD_TLockFile(PRInt32 f)
+{
+    PRInt32 rv;
+    rv = lockf(f, F_TLOCK, 0);
+    if (rv == 0)
+        return PR_SUCCESS;
+    _PR_MD_MAP_LOCKF_ERROR(_MD_ERRNO());
+    return PR_FAILURE;
+}
+
+PRStatus
+_MD_UnlockFile(PRInt32 f)
+{
+    PRInt32 rv;
+    rv = lockf(f, F_ULOCK, 0);
+    if (rv == 0)
+        return PR_SUCCESS;
+    _PR_MD_MAP_LOCKF_ERROR(_MD_ERRNO());
+    return PR_FAILURE;
+}
+#endif
+
+PRStatus _MD_gethostname(char *name, PRUint32 namelen)
+{
+    PRIntn rv;
+
+    rv = gethostname(name, namelen);
+    if (0 == rv) {
+        return PR_SUCCESS;
+    }
+    _PR_MD_MAP_GETHOSTNAME_ERROR(_MD_ERRNO());
+    return PR_FAILURE;
+}
+
+PRStatus _MD_getsysinfo(PRSysInfo cmd, char *name, PRUint32 namelen)
+{
+	struct utsname info;
+
+	PR_ASSERT((cmd == PR_SI_SYSNAME) || (cmd == PR_SI_RELEASE));
+
+	if (uname(&info) == -1) {
+		_PR_MD_MAP_DEFAULT_ERROR(errno);
+    	return PR_FAILURE;
+	}
+	if (PR_SI_SYSNAME == cmd)
+		(void)PR_snprintf(name, namelen, info.sysname);
+	else if (PR_SI_RELEASE == cmd)
+		(void)PR_snprintf(name, namelen, info.release);
+	else
+		return PR_FAILURE;
+    return PR_SUCCESS;
+}
+
+/*
+ *******************************************************************
+ *
+ * Memory-mapped files
+ *
+ *******************************************************************
+ */
+
+PRStatus _MD_CreateFileMap(PRFileMap *fmap, PRInt64 size)
+{
+    PRFileInfo info;
+    PRUint32 sz;
+
+    LL_L2UI(sz, size);
+    if (sz) {
+        if (PR_GetOpenFileInfo(fmap->fd, &info) == PR_FAILURE) {
+            return PR_FAILURE;
+        }
+        if (sz > info.size) {
+            /*
+             * Need to extend the file
+             */
+            if (fmap->prot != PR_PROT_READWRITE) {
+                PR_SetError(PR_NO_ACCESS_RIGHTS_ERROR, 0);
+                return PR_FAILURE;
+            }
+            if (PR_Seek(fmap->fd, sz - 1, PR_SEEK_SET) == -1) {
+                return PR_FAILURE;
+            }
+            if (PR_Write(fmap->fd, "", 1) != 1) {
+                return PR_FAILURE;
+            }
+        }
+    }
+    if (fmap->prot == PR_PROT_READONLY) {
+        fmap->md.prot = PROT_READ;
+#ifdef OSF1V4_MAP_PRIVATE_BUG
+        /*
+         * Use MAP_SHARED to work around a bug in OSF1 V4.0D
+         * (QAR 70220 in the OSF_QAR database) that results in
+         * corrupted data in the memory-mapped region.  This
+         * bug is fixed in V5.0.
+         */
+        fmap->md.flags = MAP_SHARED;
+#else
+        fmap->md.flags = MAP_PRIVATE;
+#endif
+    } else if (fmap->prot == PR_PROT_READWRITE) {
+        fmap->md.prot = PROT_READ | PROT_WRITE;
+        fmap->md.flags = MAP_SHARED;
+    } else {
+        PR_ASSERT(fmap->prot == PR_PROT_WRITECOPY);
+        fmap->md.prot = PROT_READ | PROT_WRITE;
+        fmap->md.flags = MAP_PRIVATE;
+    }
+    return PR_SUCCESS;
+}
+
+void * _MD_MemMap(
+    PRFileMap *fmap,
+    PRInt64 offset,
+    PRUint32 len)
+{
+    PRInt32 off;
+    void *addr;
+
+    LL_L2I(off, offset);
+    if ((addr = mmap(0, len, fmap->md.prot, fmap->md.flags,
+        fmap->fd->secret->md.osfd, off)) == (void *) -1) {
+            _PR_MD_MAP_MMAP_ERROR(_MD_ERRNO());
+        addr = NULL;
+    }
+    return addr;
+}
+
+PRStatus _MD_MemUnmap(void *addr, PRUint32 len)
+{
+    if (munmap(addr, len) == 0) {
+        return PR_SUCCESS;
+    }
+    _PR_MD_MAP_DEFAULT_ERROR(errno);
+    return PR_FAILURE;
+}
+
+PRStatus _MD_CloseFileMap(PRFileMap *fmap)
+{
+    if ( PR_TRUE == fmap->md.isAnonFM ) {
+        PRStatus rc = PR_Close( fmap->fd );
+        if ( PR_FAILURE == rc ) {
+            PR_LOG( _pr_io_lm, PR_LOG_DEBUG,
+                ("_MD_CloseFileMap(): error closing anonymnous file map osfd"));
+            return PR_FAILURE;
+        }
+    }
+    PR_DELETE(fmap);
+    return PR_SUCCESS;
+}
+
+PRStatus _MD_SyncMemMap(
+    PRFileDesc *fd,
+    void *addr,
+    PRUint32 len)
+{
+    /* msync(..., MS_SYNC) alone is sufficient to flush modified data to disk
+     * synchronously. It is not necessary to call fsync. */
+    if (msync(addr, len, MS_SYNC) == 0) {
+        return PR_SUCCESS;
+    }
+    _PR_MD_MAP_DEFAULT_ERROR(errno);
+    return PR_FAILURE;
+}
+
+#if defined(_PR_NEED_FAKE_POLL)
+
+/*
+ * Some platforms don't have poll().  For easier porting of code
+ * that calls poll(), we emulate poll() using select().
+ */
+
+int poll(struct pollfd *filedes, unsigned long nfds, int timeout)
+{
+    int i;
+    int rv;
+    int maxfd;
+    fd_set rd, wr, ex;
+    struct timeval tv, *tvp;
+
+    if (timeout < 0 && timeout != -1) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    if (timeout == -1) {
+        tvp = NULL;
+    } else {
+        tv.tv_sec = timeout / 1000;
+        tv.tv_usec = (timeout % 1000) * 1000;
+        tvp = &tv;
+    }
+
+    maxfd = -1;
+    FD_ZERO(&rd);
+    FD_ZERO(&wr);
+    FD_ZERO(&ex);
+
+    for (i = 0; i < nfds; i++) {
+        int osfd = filedes[i].fd;
+        int events = filedes[i].events;
+        PRBool fdHasEvent = PR_FALSE;
+
+        if (osfd < 0) {
+            continue;  /* Skip this osfd. */
+        }
+
+        /*
+         * Map the poll events to the select fd_sets.
+         *     POLLIN, POLLRDNORM  ===> readable
+         *     POLLOUT, POLLWRNORM ===> writable
+         *     POLLPRI, POLLRDBAND ===> exception
+         *     POLLNORM, POLLWRBAND (and POLLMSG on some platforms)
+         *     are ignored.
+         *
+         * The output events POLLERR and POLLHUP are never turned on.
+         * POLLNVAL may be turned on.
+         */
+
+        if (events & (POLLIN | POLLRDNORM)) {
+            FD_SET(osfd, &rd);
+            fdHasEvent = PR_TRUE;
+        }
+        if (events & (POLLOUT | POLLWRNORM)) {
+            FD_SET(osfd, &wr);
+            fdHasEvent = PR_TRUE;
+        }
+        if (events & (POLLPRI | POLLRDBAND)) {
+            FD_SET(osfd, &ex);
+            fdHasEvent = PR_TRUE;
+        }
+        if (fdHasEvent && osfd > maxfd) {
+            maxfd = osfd;
+        }
+    }
+
+    rv = select(maxfd + 1, &rd, &wr, &ex, tvp);
+
+    /* Compute poll results */
+    if (rv > 0) {
+        rv = 0;
+        for (i = 0; i < nfds; i++) {
+            PRBool fdHasEvent = PR_FALSE;
+
+            filedes[i].revents = 0;
+            if (filedes[i].fd < 0) {
+                continue;
+            }
+            if (FD_ISSET(filedes[i].fd, &rd)) {
+                if (filedes[i].events & POLLIN) {
+                    filedes[i].revents |= POLLIN;
+                }
+                if (filedes[i].events & POLLRDNORM) {
+                    filedes[i].revents |= POLLRDNORM;
+                }
+                fdHasEvent = PR_TRUE;
+            }
+            if (FD_ISSET(filedes[i].fd, &wr)) {
+                if (filedes[i].events & POLLOUT) {
+                    filedes[i].revents |= POLLOUT;
+                }
+                if (filedes[i].events & POLLWRNORM) {
+                    filedes[i].revents |= POLLWRNORM;
+                }
+                fdHasEvent = PR_TRUE;
+            }
+            if (FD_ISSET(filedes[i].fd, &ex)) {
+                if (filedes[i].events & POLLPRI) {
+                    filedes[i].revents |= POLLPRI;
+                }
+                if (filedes[i].events & POLLRDBAND) {
+                    filedes[i].revents |= POLLRDBAND;
+                }
+                fdHasEvent = PR_TRUE;
+            }
+            if (fdHasEvent) {
+                rv++;
+            }
+        }
+        PR_ASSERT(rv > 0);
+    } else if (rv == -1 && errno == EBADF) {
+        rv = 0;
+        for (i = 0; i < nfds; i++) {
+            filedes[i].revents = 0;
+            if (filedes[i].fd < 0) {
+                continue;
+            }
+            if (fcntl(filedes[i].fd, F_GETFL, 0) == -1) {
+                filedes[i].revents = POLLNVAL;
+                rv++;
+            }
+        }
+        PR_ASSERT(rv > 0);
+    }
+    PR_ASSERT(-1 != timeout || rv != 0);
+
+    return rv;
+}
+#endif /* _PR_NEED_FAKE_POLL */
diff --git a/nsprpub/pr/src/md/unix/unix_errors.c b/nsprpub/pr/src/md/unix/unix_errors.c
new file mode 100644
index 000000000..bcea0993f
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/unix_errors.c
@@ -0,0 +1,829 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+#if defined(_PR_POLL_AVAILABLE)
+#include <poll.h>
+#endif
+#include <errno.h>
+
+void _MD_unix_map_default_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err ) {
+        case EACCES:
+            prError = PR_NO_ACCESS_RIGHTS_ERROR;
+            break;
+        case EADDRINUSE:
+            prError = PR_ADDRESS_IN_USE_ERROR;
+            break;
+        case EADDRNOTAVAIL:
+            prError = PR_ADDRESS_NOT_AVAILABLE_ERROR;
+            break;
+        case EAFNOSUPPORT:
+            prError = PR_ADDRESS_NOT_SUPPORTED_ERROR;
+            break;
+        case EAGAIN:
+            prError = PR_WOULD_BLOCK_ERROR;
+            break;
+        /*
+         * On QNX and Neutrino, EALREADY is defined as EBUSY.
+         */
+#if EALREADY != EBUSY
+        case EALREADY:
+            prError = PR_ALREADY_INITIATED_ERROR;
+            break;
+#endif
+        case EBADF:
+            prError = PR_BAD_DESCRIPTOR_ERROR;
+            break;
+#ifdef EBADMSG
+        case EBADMSG:
+            prError = PR_IO_ERROR;
+            break;
+#endif
+        case EBUSY:
+            prError = PR_FILESYSTEM_MOUNTED_ERROR;
+            break;
+        case ECONNABORTED:
+            prError = PR_CONNECT_ABORTED_ERROR;
+            break;
+        case ECONNREFUSED:
+            prError = PR_CONNECT_REFUSED_ERROR;
+            break;
+        case ECONNRESET:
+            prError = PR_CONNECT_RESET_ERROR;
+            break;
+        case EDEADLK:
+            prError = PR_DEADLOCK_ERROR;
+            break;
+#ifdef EDIRCORRUPTED
+        case EDIRCORRUPTED:
+            prError = PR_DIRECTORY_CORRUPTED_ERROR;
+            break;
+#endif
+#ifdef EDQUOT
+        case EDQUOT:
+            prError = PR_NO_DEVICE_SPACE_ERROR;
+            break;
+#endif
+        case EEXIST:
+            prError = PR_FILE_EXISTS_ERROR;
+            break;
+        case EFAULT:
+            prError = PR_ACCESS_FAULT_ERROR;
+            break;
+        case EFBIG:
+            prError = PR_FILE_TOO_BIG_ERROR;
+            break;
+        case EHOSTUNREACH:
+        case EHOSTDOWN:
+            prError = PR_HOST_UNREACHABLE_ERROR;
+            break;
+        case EINPROGRESS:
+            prError = PR_IN_PROGRESS_ERROR;
+            break;
+        case EINTR:
+            prError = PR_PENDING_INTERRUPT_ERROR;
+            break;
+        case EINVAL:
+            prError = PR_INVALID_ARGUMENT_ERROR;
+            break;
+        case EIO:
+            prError = PR_IO_ERROR;
+            break;
+        case EISCONN:
+            prError = PR_IS_CONNECTED_ERROR;
+            break;
+        case EISDIR:
+            prError = PR_IS_DIRECTORY_ERROR;
+            break;
+        case ELOOP:
+            prError = PR_LOOP_ERROR;
+            break;
+        case EMFILE:
+            prError = PR_PROC_DESC_TABLE_FULL_ERROR;
+            break;
+        case EMLINK:
+            prError = PR_MAX_DIRECTORY_ENTRIES_ERROR;
+            break;
+        case EMSGSIZE:
+            prError = PR_INVALID_ARGUMENT_ERROR;
+            break;
+#ifdef EMULTIHOP
+        case EMULTIHOP:
+            prError = PR_REMOTE_FILE_ERROR;
+            break;
+#endif
+        case ENAMETOOLONG:
+            prError = PR_NAME_TOO_LONG_ERROR;
+            break;
+        case ENETUNREACH:
+            prError = PR_NETWORK_UNREACHABLE_ERROR;
+            break;
+        case ENFILE:
+            prError = PR_SYS_DESC_TABLE_FULL_ERROR;
+            break;
+        /*
+         * On SCO OpenServer 5, ENOBUFS is defined as ENOSR.
+         */
+#if defined(ENOBUFS) && (ENOBUFS != ENOSR)
+        case ENOBUFS:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+#endif
+        case ENODEV:
+            prError = PR_FILE_NOT_FOUND_ERROR;
+            break;
+        case ENOENT:
+            prError = PR_FILE_NOT_FOUND_ERROR;
+            break;
+        case ENOLCK:
+            prError = PR_FILE_IS_LOCKED_ERROR;
+            break;
+#ifdef ENOLINK 
+        case ENOLINK:
+            prError = PR_REMOTE_FILE_ERROR;
+            break;
+#endif
+        case ENOMEM:
+            prError = PR_OUT_OF_MEMORY_ERROR;
+            break;
+        case ENOPROTOOPT:
+            prError = PR_INVALID_ARGUMENT_ERROR;
+            break;
+        case ENOSPC:
+            prError = PR_NO_DEVICE_SPACE_ERROR;
+            break;
+#ifdef ENOSR
+        case ENOSR:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+#endif
+        case ENOSYS:
+            prError = PR_NOT_IMPLEMENTED_ERROR;
+            break;
+        case ENOTCONN:
+            prError = PR_NOT_CONNECTED_ERROR;
+            break;
+        case ENOTDIR:
+            prError = PR_NOT_DIRECTORY_ERROR;
+            break;
+        case ENOTSOCK:
+            prError = PR_NOT_SOCKET_ERROR;
+            break;
+        case ENXIO:
+            prError = PR_FILE_NOT_FOUND_ERROR;
+            break;
+        case EOPNOTSUPP:
+            prError = PR_NOT_TCP_SOCKET_ERROR;
+            break;
+#ifdef EOVERFLOW
+        case EOVERFLOW:
+            prError = PR_BUFFER_OVERFLOW_ERROR;
+            break;
+#endif
+        case EPERM:
+            prError = PR_NO_ACCESS_RIGHTS_ERROR;
+            break;
+        case EPIPE:
+            prError = PR_CONNECT_RESET_ERROR;
+            break;
+#ifdef EPROTO
+        case EPROTO:
+            prError = PR_IO_ERROR;
+            break;
+#endif
+        case EPROTONOSUPPORT:
+            prError = PR_PROTOCOL_NOT_SUPPORTED_ERROR;
+            break;
+        case EPROTOTYPE:
+            prError = PR_ADDRESS_NOT_SUPPORTED_ERROR;
+            break;
+        case ERANGE:
+            prError = PR_INVALID_METHOD_ERROR;
+            break;
+        case EROFS:
+            prError = PR_READ_ONLY_FILESYSTEM_ERROR;
+            break;
+        case ESPIPE:
+            prError = PR_INVALID_METHOD_ERROR;
+            break;
+        case ETIMEDOUT:
+            prError = PR_IO_TIMEOUT_ERROR;
+            break;
+#if EWOULDBLOCK != EAGAIN
+        case EWOULDBLOCK:
+            prError = PR_WOULD_BLOCK_ERROR;
+            break;
+#endif
+        case EXDEV:
+            prError = PR_NOT_SAME_DEVICE_ERROR;
+            break;
+        default:
+            prError = PR_UNKNOWN_ERROR;
+            break;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_opendir_error(int err)
+{
+    _MD_unix_map_default_error(err);
+}
+
+void _MD_unix_map_closedir_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case EINVAL:
+            prError = PR_BAD_DESCRIPTOR_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_readdir_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case 0:
+        case ENOENT:
+            prError = PR_NO_MORE_FILES_ERROR;
+            break;
+#ifdef EOVERFLOW
+        case EOVERFLOW:
+            prError = PR_IO_ERROR;
+            break;
+#endif
+        case EINVAL:
+            prError = PR_IO_ERROR;
+            break;
+        case ENXIO:
+            prError = PR_IO_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_unlink_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case EPERM:
+            prError = PR_IS_DIRECTORY_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_stat_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case ETIMEDOUT:
+            prError = PR_REMOTE_FILE_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_fstat_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case ETIMEDOUT:
+            prError = PR_REMOTE_FILE_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_rename_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case EEXIST:
+            prError = PR_DIRECTORY_NOT_EMPTY_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_access_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case ETIMEDOUT:
+            prError = PR_REMOTE_FILE_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_mkdir_error(int err)
+{
+    _MD_unix_map_default_error(err);
+}
+
+void _MD_unix_map_rmdir_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        /*
+         * On AIX 4.3, ENOTEMPTY is defined as EEXIST.
+         */
+#if ENOTEMPTY != EEXIST
+        case ENOTEMPTY:
+            prError = PR_DIRECTORY_NOT_EMPTY_ERROR;
+            break;
+#endif
+        case EEXIST:
+            prError = PR_DIRECTORY_NOT_EMPTY_ERROR;
+            break;
+        case EINVAL:
+            prError = PR_DIRECTORY_NOT_EMPTY_ERROR;
+            break;
+        case ETIMEDOUT:
+            prError = PR_REMOTE_FILE_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_read_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case EINVAL:
+            prError = PR_INVALID_METHOD_ERROR;
+            break;
+        case ENXIO:
+            prError = PR_INVALID_ARGUMENT_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_write_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case EINVAL:
+            prError = PR_INVALID_METHOD_ERROR;
+            break;
+        case ENXIO:
+            prError = PR_INVALID_METHOD_ERROR;
+            break;
+        case ETIMEDOUT:
+            prError = PR_REMOTE_FILE_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_lseek_error(int err)
+{
+    _MD_unix_map_default_error(err);
+}
+
+void _MD_unix_map_fsync_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case ETIMEDOUT:
+            prError = PR_REMOTE_FILE_ERROR;
+            break;
+        case EINVAL:
+            prError = PR_INVALID_METHOD_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_close_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case ETIMEDOUT:
+            prError = PR_REMOTE_FILE_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_socket_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case ENOMEM:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_socketavailable_error(int err)
+{
+    PR_SetError(PR_BAD_DESCRIPTOR_ERROR, err);
+}
+
+void _MD_unix_map_recv_error(int err)
+{
+    _MD_unix_map_default_error(err);
+}
+
+void _MD_unix_map_recvfrom_error(int err)
+{
+    _MD_unix_map_default_error(err);
+}
+
+void _MD_unix_map_send_error(int err)
+{
+    _MD_unix_map_default_error(err);
+}
+
+void _MD_unix_map_sendto_error(int err)
+{
+    _MD_unix_map_default_error(err);
+}
+
+void _MD_unix_map_writev_error(int err)
+{
+    _MD_unix_map_default_error(err);
+}
+
+void _MD_unix_map_accept_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case ENODEV:
+            prError = PR_NOT_TCP_SOCKET_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_connect_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+#if defined(UNIXWARE)
+        /*
+         * On some platforms, if we connect to a port on the local host 
+         * (the loopback address) that no process is listening on, we get 
+         * EIO instead of ECONNREFUSED.
+         */
+        case EIO:
+            prError = PR_CONNECT_REFUSED_ERROR;
+            break;
+#endif
+        case ENXIO:
+            prError = PR_IO_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_bind_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case EINVAL:
+            prError = PR_SOCKET_ADDRESS_IS_BOUND_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_listen_error(int err)
+{
+    _MD_unix_map_default_error(err);
+}
+
+void _MD_unix_map_shutdown_error(int err)
+{
+    _MD_unix_map_default_error(err);
+}
+
+void _MD_unix_map_socketpair_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case ENOMEM:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_getsockname_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case ENOMEM:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_getpeername_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case ENOMEM:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_getsockopt_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case EINVAL:
+            prError = PR_BUFFER_OVERFLOW_ERROR;
+            break;
+        case ENOMEM:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_setsockopt_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case EINVAL:
+            prError = PR_BUFFER_OVERFLOW_ERROR;
+            break;
+        case ENOMEM:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_open_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case EAGAIN:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        case EBUSY:
+            prError = PR_IO_ERROR;
+            break;
+        case ENODEV:
+            prError = PR_FILE_NOT_FOUND_ERROR;
+            break;
+        case ENOMEM:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+#ifdef EOVERFLOW
+        case EOVERFLOW:
+            prError = PR_FILE_TOO_BIG_ERROR;
+            break;
+#endif
+        case ETIMEDOUT:
+            prError = PR_REMOTE_FILE_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_mmap_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case EAGAIN:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        case EMFILE:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        case ENODEV:
+            prError = PR_OPERATION_NOT_SUPPORTED_ERROR;
+            break;
+        case ENXIO:
+            prError = PR_INVALID_ARGUMENT_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_gethostname_error(int err)
+{
+    _MD_unix_map_default_error(err);
+}
+
+void _MD_unix_map_select_error(int err)
+{
+    _MD_unix_map_default_error(err);
+}
+
+#if defined(_PR_POLL_AVAILABLE) || defined(_PR_NEED_FAKE_POLL)
+void _MD_unix_map_poll_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case EAGAIN:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_poll_revents_error(int err)
+{
+    if (err & POLLNVAL)
+        PR_SetError(PR_BAD_DESCRIPTOR_ERROR, EBADF);
+    else if (err & POLLHUP)
+        PR_SetError(PR_CONNECT_RESET_ERROR, EPIPE);
+    else if (err & POLLERR)
+        PR_SetError(PR_IO_ERROR, EIO);
+    else
+        PR_SetError(PR_UNKNOWN_ERROR, err);
+}
+#endif /* _PR_POLL_AVAILABLE || _PR_NEED_FAKE_POLL */
+
+
+void _MD_unix_map_flock_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case EINVAL:
+            prError = PR_BAD_DESCRIPTOR_ERROR;
+            break;
+        case EWOULDBLOCK:
+            prError = PR_FILE_IS_LOCKED_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_unix_map_lockf_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case EACCES:
+            prError = PR_FILE_IS_LOCKED_ERROR;
+            break;
+        case EDEADLK:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        default:
+            _MD_unix_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+#ifdef AIX
+void _MD_aix_map_sendfile_error(int err)
+{
+    _MD_unix_map_default_error(err);
+}
+#endif /* AIX */
+
+#ifdef HPUX11
+void _MD_hpux_map_sendfile_error(int err)
+{
+    _MD_unix_map_default_error(err);
+}
+#endif /* HPUX11 */
+
+#ifdef SOLARIS
+void _MD_solaris_map_sendfile_error(int err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        /*
+         * Solaris defines a 0 return value for sendfile to mean end-of-file.
+         */
+        case 0:
+            prError = PR_END_OF_FILE_ERROR;
+            break;
+
+        default:
+            _MD_unix_map_default_error(err) ;
+            return;
+    }
+    PR_SetError(prError, err);
+}
+#endif /* SOLARIS */
+
+#ifdef LINUX
+void _MD_linux_map_sendfile_error(int err)
+{
+    _MD_unix_map_default_error(err) ;
+}
+#endif /* LINUX */
diff --git a/nsprpub/pr/src/md/unix/unixware.c b/nsprpub/pr/src/md/unix/unixware.c
new file mode 100644
index 000000000..638af5f2e
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/unixware.c
@@ -0,0 +1,551 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+#if !defined (USE_SVR4_THREADS)
+
+/*
+         * using only NSPR threads here
+ */
+
+#include <setjmp.h>
+
+void _MD_EarlyInit(void)
+{
+}
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+    if (isCurrent) {
+	(void) setjmp(CONTEXT(t));
+    }
+    *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
+    return (PRWord *) CONTEXT(t);
+}
+
+#ifdef ALARMS_BREAK_TCP /* I don't think they do */
+
+PRInt32 _MD_connect(PRInt32 osfd, const PRNetAddr *addr, PRInt32 addrlen,
+                        PRIntervalTime timeout)
+{
+    PRInt32 rv;
+
+    _MD_BLOCK_CLOCK_INTERRUPTS();
+    rv = _connect(osfd,addr,addrlen);
+    _MD_UNBLOCK_CLOCK_INTERRUPTS();
+}
+
+PRInt32 _MD_accept(PRInt32 osfd, PRNetAddr *addr, PRInt32 addrlen,
+                        PRIntervalTime timeout)
+{
+    PRInt32 rv;
+
+    _MD_BLOCK_CLOCK_INTERRUPTS();
+    rv = _accept(osfd,addr,addrlen);
+    _MD_UNBLOCK_CLOCK_INTERRUPTS();
+    return(rv);
+}
+#endif
+
+/*
+ * These are also implemented in pratom.c using NSPR locks.  Any reason
+ * this might be better or worse?  If you like this better, define
+ * _PR_HAVE_ATOMIC_OPS in include/md/unixware.h
+ */
+#ifdef _PR_HAVE_ATOMIC_OPS
+/* Atomic operations */
+#include  <stdio.h>
+static FILE *_uw_semf;
+
+void
+_MD_INIT_ATOMIC(void)
+{
+    /* Sigh.  Sure wish SYSV semaphores weren't such a pain to use */
+    if ((_uw_semf = tmpfile()) == NULL)
+        PR_ASSERT(0);
+
+    return;
+}
+
+void
+_MD_ATOMIC_INCREMENT(PRInt32 *val)
+{
+    flockfile(_uw_semf);
+    (*val)++;
+    unflockfile(_uw_semf);
+}
+
+void
+_MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 val)
+{
+    flockfile(_uw_semf);
+    (*ptr) += val;
+    unflockfile(_uw_semf);
+}
+
+void
+_MD_ATOMIC_DECREMENT(PRInt32 *val)
+{
+    flockfile(_uw_semf);
+    (*val)--;
+    unflockfile(_uw_semf);
+}
+
+void
+_MD_ATOMIC_SET(PRInt32 *val, PRInt32 newval)
+{
+    flockfile(_uw_semf);
+    *val = newval;
+    unflockfile(_uw_semf);
+}
+#endif
+
+void
+_MD_SET_PRIORITY(_MDThread *thread, PRUintn newPri)
+{
+    return;
+}
+
+PRStatus
+_MD_InitializeThread(PRThread *thread)
+{
+	return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    _PR_MD_SWITCH_CONTEXT(thread);
+    return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread) {
+	PR_ASSERT(!(thread->flags & _PR_GLOBAL_SCOPE));
+    }
+    return PR_SUCCESS;
+}
+
+/* These functions should not be called for Unixware */
+void
+_MD_YIELD(void)
+{
+    PR_NOT_REACHED("_MD_YIELD should not be called for Unixware.");
+}
+
+PRStatus
+_MD_CREATE_THREAD(
+    PRThread *thread,
+    void (*start) (void *),
+    PRThreadPriority priority,
+    PRThreadScope scope,
+    PRThreadState state,
+    PRUint32 stackSize)
+{
+    PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for Unixware.");
+}
+
+#else  /* USE_SVR4_THREADS */
+
+/* NOTE:
+ * SPARC v9 (Ultras) do have an atomic test-and-set operation.  But
+ * SPARC v8 doesn't.  We should detect in the init if we are running on
+ * v8 or v9, and then use assembly where we can.
+ */
+
+#include <thread.h>
+#include <synch.h>
+
+static mutex_t _unixware_atomic = DEFAULTMUTEX;
+
+#define TEST_THEN_ADD(where, inc) \
+    if (mutex_lock(&_unixware_atomic) != 0)\
+        PR_ASSERT(0);\
+    *where += inc;\
+    if (mutex_unlock(&_unixware_atomic) != 0)\
+        PR_ASSERT(0);
+
+#define TEST_THEN_SET(where, val) \
+    if (mutex_lock(&_unixware_atomic) != 0)\
+        PR_ASSERT(0);\
+    *where = val;\
+    if (mutex_unlock(&_unixware_atomic) != 0)\
+        PR_ASSERT(0);
+
+void
+_MD_INIT_ATOMIC(void)
+{
+}
+
+void
+_MD_ATOMIC_INCREMENT(PRInt32 *val)
+{
+    TEST_THEN_ADD(val, 1);
+}
+
+void
+_MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 val)
+{
+    TEST_THEN_ADD(ptr, val);
+}
+
+void
+_MD_ATOMIC_DECREMENT(PRInt32 *val)
+{
+    TEST_THEN_ADD(val, 0xffffffff);
+}
+
+void
+_MD_ATOMIC_SET(PRInt32 *val, PRInt32 newval)
+{
+    TEST_THEN_SET(val, newval);
+}
+
+#include <signal.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include <sys/lwp.h>
+#include <sys/procfs.h>
+#include <sys/syscall.h>
+
+
+THREAD_KEY_T threadid_key;
+THREAD_KEY_T cpuid_key;
+THREAD_KEY_T last_thread_key;
+static sigset_t set, oldset;
+
+void _MD_EarlyInit(void)
+{
+    THR_KEYCREATE(&threadid_key, NULL);
+    THR_KEYCREATE(&cpuid_key, NULL);
+    THR_KEYCREATE(&last_thread_key, NULL);
+    sigemptyset(&set);
+    sigaddset(&set, SIGALRM);
+}
+
+PRStatus _MD_CREATE_THREAD(PRThread *thread, 
+					void (*start)(void *), 
+					PRThreadPriority priority,
+					PRThreadScope scope, 
+					PRThreadState state, 
+					PRUint32 stackSize) 
+{
+	long flags;
+	
+    /* mask out SIGALRM for native thread creation */
+    thr_sigsetmask(SIG_BLOCK, &set, &oldset); 
+
+    flags = (state == PR_JOINABLE_THREAD ? THR_SUSPENDED/*|THR_NEW_LWP*/ 
+			   : THR_SUSPENDED|THR_DETACHED/*|THR_NEW_LWP*/);
+	if (_PR_IS_GCABLE_THREAD(thread) ||
+							(scope == PR_GLOBAL_BOUND_THREAD))
+		flags |= THR_BOUND;
+
+    if (thr_create(NULL, thread->stack->stackSize,
+                  (void *(*)(void *)) start, (void *) thread, 
+				  flags,
+                  &thread->md.handle)) {
+        thr_sigsetmask(SIG_SETMASK, &oldset, NULL); 
+	return PR_FAILURE;
+    }
+
+
+    /* When the thread starts running, then the lwpid is set to the right
+     * value. Until then we want to mark this as 'uninit' so that
+     * its register state is initialized properly for GC */
+
+    thread->md.lwpid = -1;
+    thr_sigsetmask(SIG_SETMASK, &oldset, NULL); 
+    _MD_NEW_SEM(&thread->md.waiter_sem, 0);
+
+	if ((scope == PR_GLOBAL_THREAD) || (scope == PR_GLOBAL_BOUND_THREAD)) {
+		thread->flags |= _PR_GLOBAL_SCOPE;
+    }
+
+    /* 
+    ** Set the thread priority.  This will also place the thread on 
+    ** the runQ.
+    **
+    ** Force PR_SetThreadPriority to set the priority by
+    ** setting thread->priority to 100.
+    */
+    {
+    int pri;
+    pri = thread->priority;
+    thread->priority = 100;
+    PR_SetThreadPriority( thread, pri );
+
+    PR_LOG(_pr_thread_lm, PR_LOG_MIN, 
+            ("(0X%x)[Start]: on to runq at priority %d",
+            thread, thread->priority));
+    }
+
+    /* Activate the thread */
+    if (thr_continue( thread->md.handle ) ) {
+	return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}
+
+void _MD_cleanup_thread(PRThread *thread)
+{
+    thread_t hdl;
+    PRMonitor *mon;
+
+    hdl = thread->md.handle;
+
+    /* 
+    ** First, suspend the thread (unless it's the active one)
+    ** Because we suspend it first, we don't have to use LOCK_SCHEDULER to
+    ** prevent both of us modifying the thread structure at the same time.
+    */
+    if ( thread != _PR_MD_CURRENT_THREAD() ) {
+        thr_suspend(hdl);
+    }
+    PR_LOG(_pr_thread_lm, PR_LOG_MIN,
+            ("(0X%x)[DestroyThread]\n", thread));
+
+    _MD_DESTROY_SEM(&thread->md.waiter_sem);
+}
+
+void _MD_SET_PRIORITY(_MDThread *md_thread, PRUintn newPri)
+{
+	if(thr_setprio((thread_t)md_thread->handle, newPri)) {
+		PR_LOG(_pr_thread_lm, PR_LOG_MIN,
+		   ("_PR_SetThreadPriority: can't set thread priority\n"));
+	}
+}
+
+void _MD_WAIT_CV(
+    struct _MDCVar *md_cv, struct _MDLock *md_lock, PRIntervalTime timeout)
+{
+    struct timespec tt;
+    PRUint32 msec;
+    int rv;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    msec = PR_IntervalToMilliseconds(timeout);
+
+    GETTIME (&tt);
+
+    tt.tv_sec += msec / PR_MSEC_PER_SEC;
+    tt.tv_nsec += (msec % PR_MSEC_PER_SEC) * PR_NSEC_PER_MSEC;
+    /* Check for nsec overflow - otherwise we'll get an EINVAL */
+    if (tt.tv_nsec >= PR_NSEC_PER_SEC) {
+        tt.tv_sec++;
+        tt.tv_nsec -= PR_NSEC_PER_SEC;
+    }
+    me->md.sp = unixware_getsp();
+
+
+    /* XXX Solaris 2.5.x gives back EINTR occasionally for no reason
+     * hence ignore EINTR for now */
+
+    COND_TIMEDWAIT(&md_cv->cv, &md_lock->lock, &tt);
+}
+
+void _MD_lock(struct _MDLock *md_lock)
+{
+    mutex_lock(&md_lock->lock);
+}
+
+void _MD_unlock(struct _MDLock *md_lock)
+{
+    mutex_unlock(&((md_lock)->lock));
+}
+
+
+PRThread *_pr_current_thread_tls()
+{
+    PRThread *ret;
+
+    thr_getspecific(threadid_key, (void **)&ret);
+    return ret;
+}
+
+PRStatus
+_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+        _MD_WAIT_SEM(&thread->md.waiter_sem);
+        return PR_SUCCESS;
+}
+
+PRStatus
+_MD_WAKEUP_WAITER(PRThread *thread)
+{
+	if (thread == NULL) {
+		return PR_SUCCESS;
+	}
+	_MD_POST_SEM(&thread->md.waiter_sem);
+	return PR_SUCCESS;
+}
+
+_PRCPU *_pr_current_cpu_tls()
+{
+    _PRCPU *ret;
+
+    thr_getspecific(cpuid_key, (void **)&ret);
+    return ret;
+}
+
+PRThread *_pr_last_thread_tls()
+{
+    PRThread *ret;
+
+    thr_getspecific(last_thread_key, (void **)&ret);
+    return ret;
+}
+
+_MDLock _pr_ioq_lock;
+
+void _MD_INIT_IO (void)
+{
+    _MD_NEW_LOCK(&_pr_ioq_lock);
+}
+
+PRStatus _MD_InitializeThread(PRThread *thread)
+{
+    if (!_PR_IS_NATIVE_THREAD(thread))
+        return;
+		/* prime the sp; substract 4 so we don't hit the assert that
+		 * curr sp > base_stack
+		 */
+    thread->md.sp = (uint_t) thread->stack->allocBase - sizeof(long);
+    thread->md.lwpid = _lwp_self();
+    thread->md.handle = THR_SELF();
+
+	/* all threads on Solaris are global threads from NSPR's perspective
+	 * since all of them are mapped to Solaris threads.
+	 */
+    thread->flags |= _PR_GLOBAL_SCOPE;
+
+ 	/* For primordial/attached thread, we don't create an underlying native thread.
+ 	 * So, _MD_CREATE_THREAD() does not get called.  We need to do initialization
+ 	 * like allocating thread's synchronization variables and set the underlying
+ 	 * native thread's priority.
+ 	 */
+	if (thread->flags & (_PR_PRIMORDIAL | _PR_ATTACHED)) {
+	    _MD_NEW_SEM(&thread->md.waiter_sem, 0);
+	    _MD_SET_PRIORITY(&(thread->md), thread->priority);
+	}
+	return PR_SUCCESS;
+}
+
+static sigset_t old_mask;	/* store away original gc thread sigmask */
+static int gcprio;		/* store away original gc thread priority */
+static lwpid_t *all_lwps=NULL;	/* list of lwps that we suspended */
+static int num_lwps ;
+static int suspendAllOn = 0;
+
+#define VALID_SP(sp, bottom, top)	\
+       (((uint_t)(sp)) > ((uint_t)(bottom)) && ((uint_t)(sp)) < ((uint_t)(top)))
+
+void unixware_preempt_off()
+{
+    sigset_t set;
+    (void)sigfillset(&set);
+    sigprocmask (SIG_SETMASK, &set, &old_mask);
+}
+
+void unixware_preempt_on()
+{
+    sigprocmask (SIG_SETMASK, &old_mask, NULL);      
+}
+
+void _MD_Begin_SuspendAll()
+{
+    unixware_preempt_off();
+
+    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin_SuspendAll\n"));
+    /* run at highest prio so I cannot be preempted */
+    thr_getprio(thr_self(), &gcprio);
+    thr_setprio(thr_self(), 0x7fffffff); 
+    suspendAllOn = 1;
+}
+
+void _MD_End_SuspendAll()
+{
+}
+
+void _MD_End_ResumeAll()
+{
+    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("End_ResumeAll\n"));
+    thr_setprio(thr_self(), gcprio);
+    unixware_preempt_on();
+    suspendAllOn = 0;
+}
+
+void _MD_Suspend(PRThread *thr)
+{
+   int lwp_fd, result;
+   int lwp_main_proc_fd = 0;
+
+    thr_suspend(thr->md.handle);
+    if (!_PR_IS_GCABLE_THREAD(thr))
+      return;
+    /* XXX Primordial thread can't be bound to an lwp, hence there is no
+     * way we can assume that we can get the lwp status for primordial
+     * thread reliably. Hence we skip this for primordial thread, hoping
+     * that the SP is saved during lock and cond. wait. 
+     * XXX - Again this is concern only for java interpreter, not for the
+     * server, 'cause primordial thread in the server does not do java work
+     */
+    if (thr->flags & _PR_PRIMORDIAL)
+      return;
+
+    /* if the thread is not started yet then don't do anything */
+    if (!suspendAllOn || thr->md.lwpid == -1)
+      return;
+
+}
+void _MD_Resume(PRThread *thr)
+{
+   if (!_PR_IS_GCABLE_THREAD(thr) || !suspendAllOn){
+     /*XXX When the suspendAllOn is set, we will be trying to do lwp_suspend
+      * during that time we can't call any thread lib or libc calls. Hence
+      * make sure that no resume is requested for Non gcable thread
+      * during suspendAllOn */
+      PR_ASSERT(!suspendAllOn);
+      thr_continue(thr->md.handle);
+      return;
+   }
+   if (thr->md.lwpid == -1)
+     return;
+ 
+   if ( _lwp_continue(thr->md.lwpid) < 0) {
+      PR_ASSERT(0);  /* ARGH, we are hosed! */
+   }
+}
+
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
+{
+    if (isCurrent) {
+	(void) getcontext(CONTEXT(t));	/* XXX tune me: set md_IRIX.c */
+    }
+    *np = NGREG;
+    if (t->md.lwpid == -1)
+      memset(&t->md.context.uc_mcontext.gregs[0], 0, NGREG * sizeof(PRWord));
+    return (PRWord*) &t->md.context.uc_mcontext.gregs[0];
+}
+
+int
+_pr_unixware_clock_gettime (struct timespec *tp)
+{
+    struct timeval tv;
+ 
+    gettimeofday(&tv, NULL);
+    tp->tv_sec = tv.tv_sec;
+    tp->tv_nsec = tv.tv_usec * 1000;
+    return 0;
+}
+
+
+#endif /* USE_SVR4_THREADS */
diff --git a/nsprpub/pr/src/md/unix/uxpoll.c b/nsprpub/pr/src/md/unix/uxpoll.c
new file mode 100644
index 000000000..8a618ed80
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/uxpoll.c
@@ -0,0 +1,676 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#if defined(_PR_PTHREADS)
+
+#error "This file should not be compiled"
+
+#else  /* defined(_PR_PTHREADS) */
+
+#include "primpl.h"
+
+#include <sys/time.h>
+
+#include <fcntl.h>
+#ifdef _PR_USE_POLL
+#include <poll.h>
+#endif
+
+#if defined(_PR_USE_POLL)
+static PRInt32 NativeThreadPoll(
+    PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
+{
+    /*
+     * This function is mostly duplicated from ptio.s's PR_Poll().
+     */
+    PRInt32 ready = 0;
+    /*
+     * For restarting poll() if it is interrupted by a signal.
+     * We use these variables to figure out how much time has
+     * elapsed and how much of the timeout still remains.
+     */
+    PRIntn index, msecs;
+    struct pollfd *syspoll = NULL;
+    PRIntervalTime start, elapsed, remaining;
+
+    syspoll = (struct pollfd*)PR_MALLOC(npds * sizeof(struct pollfd));
+    if (NULL == syspoll)
+    {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+        return -1;
+    }
+    for (index = 0; index < npds; ++index)
+    {
+        PRFileDesc *bottom;
+        PRInt16 in_flags_read = 0, in_flags_write = 0;
+        PRInt16 out_flags_read = 0, out_flags_write = 0;
+
+        if ((NULL != pds[index].fd) && (0 != pds[index].in_flags))
+        {
+            if (pds[index].in_flags & PR_POLL_READ)
+            {
+                in_flags_read = (pds[index].fd->methods->poll)(
+                    pds[index].fd,
+                    pds[index].in_flags & ~PR_POLL_WRITE,
+                    &out_flags_read);
+            }
+            if (pds[index].in_flags & PR_POLL_WRITE)
+            {
+                in_flags_write = (pds[index].fd->methods->poll)(
+                    pds[index].fd,
+                    pds[index].in_flags & ~PR_POLL_READ,
+                    &out_flags_write);
+            }
+            if ((0 != (in_flags_read & out_flags_read))
+            || (0 != (in_flags_write & out_flags_write)))
+            {
+                /* this one is ready right now */
+                if (0 == ready)
+                {
+                    /*
+                     * We will return without calling the system
+                     * poll function.  So zero the out_flags
+                     * fields of all the poll descriptors before
+                     * this one.
+                     */
+                    int i;
+                    for (i = 0; i < index; i++)
+                    {
+                        pds[i].out_flags = 0;
+                    }
+                }
+                ready += 1;
+                pds[index].out_flags = out_flags_read | out_flags_write;
+            }
+            else
+            {
+                pds[index].out_flags = 0;  /* pre-condition */
+                /* now locate the NSPR layer at the bottom of the stack */
+                bottom = PR_GetIdentitiesLayer(pds[index].fd, PR_NSPR_IO_LAYER);
+                PR_ASSERT(NULL != bottom);  /* what to do about that? */
+                if ((NULL != bottom)
+                && (_PR_FILEDESC_OPEN == bottom->secret->state))
+                {
+                    if (0 == ready)
+                    {
+                        syspoll[index].fd = bottom->secret->md.osfd;
+                        syspoll[index].events = 0;  /* pre-condition */
+                        if (in_flags_read & PR_POLL_READ)
+                        {
+                            pds[index].out_flags |=
+                                _PR_POLL_READ_SYS_READ;
+                            syspoll[index].events |= POLLIN;
+                        }
+                        if (in_flags_read & PR_POLL_WRITE)
+                        {
+                            pds[index].out_flags |=
+                                _PR_POLL_READ_SYS_WRITE;
+                            syspoll[index].events |= POLLOUT;
+                        }
+                        if (in_flags_write & PR_POLL_READ)
+                        {
+                            pds[index].out_flags |=
+                                _PR_POLL_WRITE_SYS_READ;
+                            syspoll[index].events |= POLLIN;
+                        }
+                        if (in_flags_write & PR_POLL_WRITE)
+                        {
+                            pds[index].out_flags |=
+                                _PR_POLL_WRITE_SYS_WRITE;
+                            syspoll[index].events |= POLLOUT;
+                        }
+                        if (pds[index].in_flags & PR_POLL_EXCEPT)
+                            syspoll[index].events |= POLLPRI;
+                    }
+                }
+                else
+                {
+                    if (0 == ready)
+                    {
+                        int i;
+                        for (i = 0; i < index; i++)
+                        {
+                            pds[i].out_flags = 0;
+                        }
+                    }
+                    ready += 1;  /* this will cause an abrupt return */
+                    pds[index].out_flags = PR_POLL_NVAL;  /* bogii */
+                }
+            }
+        }
+        else
+        {
+            /* make poll() ignore this entry */
+            syspoll[index].fd = -1;
+            syspoll[index].events = 0;
+            pds[index].out_flags = 0;
+        }
+    }
+
+    if (0 == ready)
+    {
+        switch (timeout)
+        {
+            case PR_INTERVAL_NO_WAIT: msecs = 0; break;
+            case PR_INTERVAL_NO_TIMEOUT: msecs = -1; break;
+            default:
+                msecs = PR_IntervalToMilliseconds(timeout);
+                start = PR_IntervalNow();
+        }
+
+retry:
+        ready = _MD_POLL(syspoll, npds, msecs);
+        if (-1 == ready)
+        {
+            PRIntn oserror = errno;
+
+            if (EINTR == oserror)
+            {
+                if (timeout == PR_INTERVAL_NO_TIMEOUT) goto retry;
+                else if (timeout == PR_INTERVAL_NO_WAIT) ready = 0;
+                else
+                {
+                    elapsed = (PRIntervalTime)(PR_IntervalNow() - start);
+                    if (elapsed > timeout) ready = 0;  /* timed out */
+                    else
+                    {
+                        remaining = timeout - elapsed;
+                        msecs = PR_IntervalToMilliseconds(remaining);
+                        goto retry;
+                    }
+                }
+            }
+            else _PR_MD_MAP_POLL_ERROR(oserror);
+        }
+        else if (ready > 0)
+        {
+            for (index = 0; index < npds; ++index)
+            {
+                PRInt16 out_flags = 0;
+                if ((NULL != pds[index].fd) && (0 != pds[index].in_flags))
+                {
+                    if (0 != syspoll[index].revents)
+                    {
+                        /*
+                        ** Set up the out_flags so that it contains the
+                        ** bits that the highest layer thinks are nice
+                        ** to have. Then the client of that layer will
+                        ** call the appropriate I/O function and maybe
+                        ** the protocol will make progress.
+                        */
+                        if (syspoll[index].revents & POLLIN)
+                        {
+                            if (pds[index].out_flags
+                            & _PR_POLL_READ_SYS_READ)
+                            {
+                                out_flags |= PR_POLL_READ;
+                            }
+                            if (pds[index].out_flags
+                            & _PR_POLL_WRITE_SYS_READ)
+                            {
+                                out_flags |= PR_POLL_WRITE;
+                            }
+                        }
+                        if (syspoll[index].revents & POLLOUT)
+                        {
+                            if (pds[index].out_flags
+                            & _PR_POLL_READ_SYS_WRITE)
+                            {
+                                out_flags |= PR_POLL_READ;
+                            }
+                            if (pds[index].out_flags
+                            & _PR_POLL_WRITE_SYS_WRITE)
+                            {
+                                out_flags |= PR_POLL_WRITE;
+                            }
+                        }
+                        if (syspoll[index].revents & POLLPRI)
+                            out_flags |= PR_POLL_EXCEPT;
+                        if (syspoll[index].revents & POLLERR)
+                            out_flags |= PR_POLL_ERR;
+                        if (syspoll[index].revents & POLLNVAL)
+                            out_flags |= PR_POLL_NVAL;
+                        if (syspoll[index].revents & POLLHUP)
+                            out_flags |= PR_POLL_HUP;
+                    }
+                }
+                pds[index].out_flags = out_flags;
+            }
+        }
+    }
+
+    PR_DELETE(syspoll);
+    return ready;
+
+}  /* NativeThreadPoll */
+#endif  /* defined(_PR_USE_POLL) */
+
+#if !defined(_PR_USE_POLL)
+static PRInt32 NativeThreadSelect(
+    PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
+{
+    /*
+     * This code is almost a duplicate of w32poll.c's _PR_MD_PR_POLL().
+     */
+    fd_set rd, wt, ex;
+    PRFileDesc *bottom;
+    PRPollDesc *pd, *epd;
+    PRInt32 maxfd = -1, ready, err;
+    PRIntervalTime remaining, elapsed, start;
+
+    struct timeval tv, *tvp = NULL;
+
+    FD_ZERO(&rd);
+    FD_ZERO(&wt);
+    FD_ZERO(&ex);
+
+    ready = 0;
+    for (pd = pds, epd = pd + npds; pd < epd; pd++)
+    {
+        PRInt16 in_flags_read = 0, in_flags_write = 0;
+        PRInt16 out_flags_read = 0, out_flags_write = 0;
+
+        if ((NULL != pd->fd) && (0 != pd->in_flags))
+        {
+            if (pd->in_flags & PR_POLL_READ)
+            {
+                in_flags_read = (pd->fd->methods->poll)(
+                    pd->fd, pd->in_flags & ~PR_POLL_WRITE, &out_flags_read);
+            }
+            if (pd->in_flags & PR_POLL_WRITE)
+            {
+                in_flags_write = (pd->fd->methods->poll)(
+                    pd->fd, pd->in_flags & ~PR_POLL_READ, &out_flags_write);
+            }
+            if ((0 != (in_flags_read & out_flags_read))
+            || (0 != (in_flags_write & out_flags_write)))
+            {
+                /* this one's ready right now */
+                if (0 == ready)
+                {
+                    /*
+                     * We will have to return without calling the
+                     * system poll/select function.  So zero the
+                     * out_flags fields of all the poll descriptors
+                     * before this one.
+                     */
+                    PRPollDesc *prev;
+                    for (prev = pds; prev < pd; prev++)
+                    {
+                        prev->out_flags = 0;
+                    }
+                }
+                ready += 1;
+                pd->out_flags = out_flags_read | out_flags_write;
+            }
+            else
+            {
+                pd->out_flags = 0;  /* pre-condition */
+
+                /* make sure this is an NSPR supported stack */
+                bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+                PR_ASSERT(NULL != bottom);  /* what to do about that? */
+                if ((NULL != bottom)
+                && (_PR_FILEDESC_OPEN == bottom->secret->state))
+                {
+                    if (0 == ready)
+                    {
+                        PRInt32 osfd = bottom->secret->md.osfd;
+                        if (osfd > maxfd) maxfd = osfd;
+                        if (in_flags_read & PR_POLL_READ)
+                        {
+                            pd->out_flags |= _PR_POLL_READ_SYS_READ;
+                            FD_SET(osfd, &rd);
+                        }
+                        if (in_flags_read & PR_POLL_WRITE)
+                        {
+                            pd->out_flags |= _PR_POLL_READ_SYS_WRITE;
+                            FD_SET(osfd, &wt);
+                        }
+                        if (in_flags_write & PR_POLL_READ)
+                        {
+                            pd->out_flags |= _PR_POLL_WRITE_SYS_READ;
+                            FD_SET(osfd, &rd);
+                        }
+                        if (in_flags_write & PR_POLL_WRITE)
+                        {
+                            pd->out_flags |= _PR_POLL_WRITE_SYS_WRITE;
+                            FD_SET(osfd, &wt);
+                        }
+                        if (pd->in_flags & PR_POLL_EXCEPT) FD_SET(osfd, &ex);
+                    }
+                }
+                else
+                {
+                    if (0 == ready)
+                    {
+                        PRPollDesc *prev;
+                        for (prev = pds; prev < pd; prev++)
+                        {
+                            prev->out_flags = 0;
+                        }
+                    }
+                    ready += 1;  /* this will cause an abrupt return */
+                    pd->out_flags = PR_POLL_NVAL;  /* bogii */
+                }
+            }
+        }
+        else
+        {
+            pd->out_flags = 0;
+        }
+    }
+
+    if (0 != ready) return ready;  /* no need to block */
+
+    remaining = timeout;
+    start = PR_IntervalNow();
+
+retry:
+    if (timeout != PR_INTERVAL_NO_TIMEOUT)
+    {
+        PRInt32 ticksPerSecond = PR_TicksPerSecond();
+        tv.tv_sec = remaining / ticksPerSecond;
+        tv.tv_usec = PR_IntervalToMicroseconds( remaining % ticksPerSecond );
+        tvp = &tv;
+    }
+
+    ready = _MD_SELECT(maxfd + 1, &rd, &wt, &ex, tvp);
+
+    if (ready == -1 && errno == EINTR)
+    {
+        if (timeout == PR_INTERVAL_NO_TIMEOUT) goto retry;
+        else
+        {
+            elapsed = (PRIntervalTime) (PR_IntervalNow() - start);
+            if (elapsed > timeout) ready = 0;  /* timed out */
+            else
+            {
+                remaining = timeout - elapsed;
+                goto retry;
+            }
+        }
+    }
+
+    /*
+    ** Now to unravel the select sets back into the client's poll
+    ** descriptor list. Is this possibly an area for pissing away
+    ** a few cycles or what?
+    */
+    if (ready > 0)
+    {
+        ready = 0;
+        for (pd = pds, epd = pd + npds; pd < epd; pd++)
+        {
+            PRInt16 out_flags = 0;
+            if ((NULL != pd->fd) && (0 != pd->in_flags))
+            {
+                PRInt32 osfd;
+                bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+                PR_ASSERT(NULL != bottom);
+
+                osfd = bottom->secret->md.osfd;
+
+                if (FD_ISSET(osfd, &rd))
+                {
+                    if (pd->out_flags & _PR_POLL_READ_SYS_READ)
+                        out_flags |= PR_POLL_READ;
+                    if (pd->out_flags & _PR_POLL_WRITE_SYS_READ)
+                        out_flags |= PR_POLL_WRITE;
+                } 
+                if (FD_ISSET(osfd, &wt))
+                {
+                    if (pd->out_flags & _PR_POLL_READ_SYS_WRITE)
+                        out_flags |= PR_POLL_READ;
+                    if (pd->out_flags & _PR_POLL_WRITE_SYS_WRITE)
+                        out_flags |= PR_POLL_WRITE;
+                } 
+                if (FD_ISSET(osfd, &ex)) out_flags |= PR_POLL_EXCEPT;
+            }
+            pd->out_flags = out_flags;
+            if (out_flags) ready++;
+        }
+        PR_ASSERT(ready > 0);
+    }
+    else if (ready < 0)
+    {
+        err = _MD_ERRNO();
+        if (err == EBADF)
+        {
+            /* Find the bad fds */
+            ready = 0;
+            for (pd = pds, epd = pd + npds; pd < epd; pd++)
+            {
+                pd->out_flags = 0;
+                if ((NULL != pd->fd) && (0 != pd->in_flags))
+                {
+                    bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+                    if (fcntl(bottom->secret->md.osfd, F_GETFL, 0) == -1)
+                    {
+                        pd->out_flags = PR_POLL_NVAL;
+                        ready++;
+                    }
+                }
+            }
+            PR_ASSERT(ready > 0);
+        }
+        else _PR_MD_MAP_SELECT_ERROR(err);
+    }
+
+    return ready;
+}  /* NativeThreadSelect */
+#endif  /* !defined(_PR_USE_POLL) */
+
+static PRInt32 LocalThreads(
+    PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
+{
+    PRPollDesc *pd, *epd;
+    PRInt32 ready, pdcnt;
+    _PRUnixPollDesc *unixpds, *unixpd;
+
+    /*
+     * XXX
+     *        PRPollDesc has a PRFileDesc field, fd, while the IOQ
+     *        is a list of PRPollQueue structures, each of which contains
+     *        a _PRUnixPollDesc. A _PRUnixPollDesc struct contains
+     *        the OS file descriptor, osfd, and not a PRFileDesc.
+     *        So, we have allocate memory for _PRUnixPollDesc structures,
+     *        copy the flags information from the pds list and have pq
+     *        point to this list of _PRUnixPollDesc structures.
+     *
+     *        It would be better if the memory allocation can be avoided.
+     */
+
+    unixpd = unixpds = (_PRUnixPollDesc*)
+        PR_MALLOC(npds * sizeof(_PRUnixPollDesc));
+    if (NULL == unixpds)
+    {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+        return -1;
+    }
+
+    ready = 0;
+    for (pdcnt = 0, pd = pds, epd = pd + npds; pd < epd; pd++)
+    {
+        PRFileDesc *bottom;
+        PRInt16 in_flags_read = 0, in_flags_write = 0;
+        PRInt16 out_flags_read = 0, out_flags_write = 0;
+
+        if ((NULL != pd->fd) && (0 != pd->in_flags))
+        {
+            if (pd->in_flags & PR_POLL_READ)
+            {
+                in_flags_read = (pd->fd->methods->poll)(
+                    pd->fd, pd->in_flags & ~PR_POLL_WRITE, &out_flags_read);
+            }
+            if (pd->in_flags & PR_POLL_WRITE)
+            {
+                in_flags_write = (pd->fd->methods->poll)(
+                    pd->fd, pd->in_flags & ~PR_POLL_READ, &out_flags_write);
+            }
+            if ((0 != (in_flags_read & out_flags_read))
+            || (0 != (in_flags_write & out_flags_write)))
+            {
+                /* this one's ready right now */
+                if (0 == ready)
+                {
+                    /*
+                     * We will have to return without calling the
+                     * system poll/select function.  So zero the
+                     * out_flags fields of all the poll descriptors
+                     * before this one.
+                     */
+                    PRPollDesc *prev;
+                    for (prev = pds; prev < pd; prev++)
+                    {
+                        prev->out_flags = 0;
+                    }
+                }
+                ready += 1;
+                pd->out_flags = out_flags_read | out_flags_write;
+            }
+            else
+            {
+                pd->out_flags = 0;  /* pre-condition */
+                bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+                PR_ASSERT(NULL != bottom);  /* what to do about that? */
+                if ((NULL != bottom)
+                && (_PR_FILEDESC_OPEN == bottom->secret->state))
+                {
+                    if (0 == ready)
+                    {
+                        unixpd->osfd = bottom->secret->md.osfd;
+                        unixpd->in_flags = 0;
+                        if (in_flags_read & PR_POLL_READ)
+                        {
+                            unixpd->in_flags |= _PR_UNIX_POLL_READ;
+                            pd->out_flags |= _PR_POLL_READ_SYS_READ;
+                        }
+                        if (in_flags_read & PR_POLL_WRITE)
+                        {
+                            unixpd->in_flags |= _PR_UNIX_POLL_WRITE;
+                            pd->out_flags |= _PR_POLL_READ_SYS_WRITE;
+                        }
+                        if (in_flags_write & PR_POLL_READ)
+                        {
+                            unixpd->in_flags |= _PR_UNIX_POLL_READ;
+                            pd->out_flags |= _PR_POLL_WRITE_SYS_READ;
+                        }
+                        if (in_flags_write & PR_POLL_WRITE)
+                        {
+                            unixpd->in_flags |= _PR_UNIX_POLL_WRITE;
+                            pd->out_flags |= _PR_POLL_WRITE_SYS_WRITE;
+                        }
+                        if ((in_flags_read | in_flags_write) & PR_POLL_EXCEPT)
+                        {
+                            unixpd->in_flags |= _PR_UNIX_POLL_EXCEPT;
+                        }
+                        unixpd++; pdcnt++;
+                    }
+                }
+                else
+                {
+                    if (0 == ready)
+                    {
+                        PRPollDesc *prev;
+                        for (prev = pds; prev < pd; prev++)
+                        {
+                            prev->out_flags = 0;
+                        }
+                    }
+                    ready += 1;  /* this will cause an abrupt return */
+                    pd->out_flags = PR_POLL_NVAL;  /* bogii */
+                }
+            }
+        }
+    }
+
+    if (0 != ready)
+    {
+        /* no need to block */
+        PR_DELETE(unixpds);
+        return ready;
+    }
+
+    ready = _PR_WaitForMultipleFDs(unixpds, pdcnt, timeout);
+
+    /*
+     * Copy the out_flags from the _PRUnixPollDesc structures to the
+     * user's PRPollDesc structures and free the allocated memory
+     */
+    unixpd = unixpds;
+    for (pd = pds, epd = pd + npds; pd < epd; pd++)
+    {
+        PRInt16 out_flags = 0;
+        if ((NULL != pd->fd) && (0 != pd->in_flags))
+        {
+            /*
+             * take errors from the poll operation,
+             * the R/W bits from the request
+             */
+            if (0 != unixpd->out_flags)
+            {
+                if (unixpd->out_flags & _PR_UNIX_POLL_READ)
+                {
+                    if (pd->out_flags & _PR_POLL_READ_SYS_READ)
+                        out_flags |= PR_POLL_READ;
+                    if (pd->out_flags & _PR_POLL_WRITE_SYS_READ)
+                        out_flags |= PR_POLL_WRITE;
+                }
+                if (unixpd->out_flags & _PR_UNIX_POLL_WRITE)
+                {
+                    if (pd->out_flags & _PR_POLL_READ_SYS_WRITE)
+                        out_flags |= PR_POLL_READ;
+                    if (pd->out_flags & _PR_POLL_WRITE_SYS_WRITE)
+                        out_flags |= PR_POLL_WRITE;
+                }
+                if (unixpd->out_flags & _PR_UNIX_POLL_EXCEPT)
+                    out_flags |= PR_POLL_EXCEPT;
+                if (unixpd->out_flags & _PR_UNIX_POLL_ERR)
+                    out_flags |= PR_POLL_ERR;
+                if (unixpd->out_flags & _PR_UNIX_POLL_NVAL)
+                    out_flags |= PR_POLL_NVAL;
+                if (unixpd->out_flags & _PR_UNIX_POLL_HUP)
+                    out_flags |= PR_POLL_HUP;
+            }
+            unixpd++;
+        }
+        pd->out_flags = out_flags;
+    }
+
+    PR_DELETE(unixpds);
+
+    return ready;
+}  /* LocalThreads */
+
+#if defined(_PR_USE_POLL)
+#define NativeThreads NativeThreadPoll
+#else
+#define NativeThreads NativeThreadSelect
+#endif
+
+PRInt32 _MD_pr_poll(PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
+{
+    PRInt32 rv = 0;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    if (_PR_PENDING_INTERRUPT(me))
+    {
+        me->flags &= ~_PR_INTERRUPT;
+        PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+        return -1;
+    }
+    if (0 == npds) PR_Sleep(timeout);
+    else if (_PR_IS_NATIVE_THREAD(me))
+        rv = NativeThreads(pds, npds, timeout);
+    else rv = LocalThreads(pds, npds, timeout);
+
+    return rv;
+}  /* _MD_pr_poll */
+
+#endif  /* defined(_PR_PTHREADS) */               
+
+/* uxpoll.c */
+
diff --git a/nsprpub/pr/src/md/unix/uxproces.c b/nsprpub/pr/src/md/unix/uxproces.c
new file mode 100644
index 000000000..a3b35e540
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/uxproces.c
@@ -0,0 +1,885 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/wait.h>
+#include <string.h>
+#if defined(AIX)
+#include <dlfcn.h>  /* For dlopen, dlsym, dlclose */
+#endif
+
+#if defined(DARWIN)
+#if defined(HAVE_CRT_EXTERNS_H)
+#include <crt_externs.h>
+#endif
+#else
+PR_IMPORT_DATA(char **) environ;
+#endif
+
+/*
+ * HP-UX 9 doesn't have the SA_RESTART flag.
+ */
+#ifndef SA_RESTART
+#define SA_RESTART 0
+#endif
+
+/*
+ **********************************************************************
+ *
+ * The Unix process routines
+ *
+ **********************************************************************
+ */
+
+#define _PR_SIGNALED_EXITSTATUS 256
+
+typedef enum pr_PidState {
+    _PR_PID_DETACHED,
+    _PR_PID_REAPED,
+    _PR_PID_WAITING
+} pr_PidState;
+
+typedef struct pr_PidRecord {
+    pid_t pid;
+    int exitStatus;
+    pr_PidState state;
+    PRCondVar *reapedCV;
+    struct pr_PidRecord *next;
+} pr_PidRecord;
+
+/*
+ * Irix sprocs and LinuxThreads are actually a kind of processes
+ * that can share the virtual address space and file descriptors.
+ */
+#if (defined(IRIX) && !defined(_PR_PTHREADS)) \
+        || ((defined(LINUX) || defined(__GNU__) || defined(__GLIBC__)) \
+        && defined(_PR_PTHREADS))
+#define _PR_SHARE_CLONES
+#endif
+
+/*
+ * The macro _PR_NATIVE_THREADS indicates that we are
+ * using native threads only, so waitpid() blocks just the
+ * calling thread, not the process.  In this case, the waitpid
+ * daemon thread can safely block in waitpid().  So we don't
+ * need to catch SIGCHLD, and the pipe to unblock PR_Poll() is
+ * also not necessary.
+ */
+
+#if defined(_PR_GLOBAL_THREADS_ONLY) \
+	|| (defined(_PR_PTHREADS) \
+	&& !defined(LINUX) && !defined(__GNU__) && !defined(__GLIBC__))
+#define _PR_NATIVE_THREADS
+#endif
+
+/*
+ * All the static variables used by the Unix process routines are
+ * collected in this structure.
+ */
+
+static struct {
+    PRCallOnceType once;
+    PRThread *thread;
+    PRLock *ml;
+#if defined(_PR_NATIVE_THREADS)
+    PRInt32 numProcs;
+    PRCondVar *cv;
+#else
+    int pipefd[2];
+#endif
+    pr_PidRecord **pidTable;
+
+#ifdef _PR_SHARE_CLONES
+    struct pr_CreateProcOp *opHead, *opTail;
+#endif
+
+#ifdef AIX
+    pid_t (*forkptr)(void);  /* Newer versions of AIX (starting in 4.3.2)
+                              * have f_fork, which is faster than the
+                              * regular fork in a multithreaded process
+                              * because it skips calling the fork handlers.
+                              * So we look up the f_fork symbol to see if
+                              * it's available and fall back on fork.
+                              */
+#endif /* AIX */
+} pr_wp;
+
+#ifdef _PR_SHARE_CLONES
+static int pr_waitpid_daemon_exit;
+
+void
+_MD_unix_terminate_waitpid_daemon(void)
+{
+    if (pr_wp.thread) {
+        pr_waitpid_daemon_exit = 1;
+        write(pr_wp.pipefd[1], "", 1);
+        PR_JoinThread(pr_wp.thread);
+    }
+}
+#endif
+
+static PRStatus _MD_InitProcesses(void);
+#if !defined(_PR_NATIVE_THREADS)
+static void pr_InstallSigchldHandler(void);
+#endif
+
+static PRProcess *
+ForkAndExec(
+    const char *path,
+    char *const *argv,
+    char *const *envp,
+    const PRProcessAttr *attr)
+{
+    PRProcess *process;
+    int nEnv, idx;
+    char *const *childEnvp;
+    char **newEnvp = NULL;
+    int flags;
+
+    process = PR_NEW(PRProcess);
+    if (!process) {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+        return NULL;
+    }
+
+    childEnvp = envp;
+    if (attr && attr->fdInheritBuffer) {
+        PRBool found = PR_FALSE;
+
+        if (NULL == childEnvp) {
+#ifdef DARWIN
+#ifdef HAVE_CRT_EXTERNS_H
+            childEnvp = *(_NSGetEnviron());
+#else
+            /* _NSGetEnviron() is not available on iOS. */
+            PR_DELETE(process);
+            PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+            return NULL;
+#endif
+#else
+            childEnvp = environ;
+#endif
+        }
+
+        for (nEnv = 0; childEnvp[nEnv]; nEnv++) {
+        }
+        newEnvp = (char **) PR_MALLOC((nEnv + 2) * sizeof(char *));
+        if (NULL == newEnvp) {
+            PR_DELETE(process);
+            PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+            return NULL;
+        }
+        for (idx = 0; idx < nEnv; idx++) {
+            newEnvp[idx] = childEnvp[idx];
+            if (!found && !strncmp(newEnvp[idx], "NSPR_INHERIT_FDS=", 17)) {
+                newEnvp[idx] = attr->fdInheritBuffer;
+                found = PR_TRUE;
+            }
+        }
+        if (!found) {
+            newEnvp[idx++] = attr->fdInheritBuffer;
+        }
+        newEnvp[idx] = NULL;
+        childEnvp = newEnvp;
+    }
+
+#ifdef AIX
+    process->md.pid = (*pr_wp.forkptr)();
+#elif defined(NTO) || defined(SYMBIAN)
+    /*
+     * fork() & exec() does not work in a multithreaded process.
+     * Use spawn() instead.
+     */
+    {
+        int fd_map[3] = { 0, 1, 2 };
+
+        if (attr) {
+            if (attr->stdinFd && attr->stdinFd->secret->md.osfd != 0) {
+                fd_map[0] = dup(attr->stdinFd->secret->md.osfd);
+                flags = fcntl(fd_map[0], F_GETFL, 0);
+                if (flags & O_NONBLOCK)
+                    fcntl(fd_map[0], F_SETFL, flags & ~O_NONBLOCK);
+            }
+            if (attr->stdoutFd && attr->stdoutFd->secret->md.osfd != 1) {
+                fd_map[1] = dup(attr->stdoutFd->secret->md.osfd);
+                flags = fcntl(fd_map[1], F_GETFL, 0);
+                if (flags & O_NONBLOCK)
+                    fcntl(fd_map[1], F_SETFL, flags & ~O_NONBLOCK);
+            }
+            if (attr->stderrFd && attr->stderrFd->secret->md.osfd != 2) {
+                fd_map[2] = dup(attr->stderrFd->secret->md.osfd);
+                flags = fcntl(fd_map[2], F_GETFL, 0);
+                if (flags & O_NONBLOCK)
+                    fcntl(fd_map[2], F_SETFL, flags & ~O_NONBLOCK);
+            }
+
+            PR_ASSERT(attr->currentDirectory == NULL);  /* not implemented */
+        }
+
+#ifdef SYMBIAN
+        /* In Symbian OS, we use posix_spawn instead of fork() and exec() */
+        posix_spawn(&(process->md.pid), path, NULL, NULL, argv, childEnvp);
+#else
+        process->md.pid = spawn(path, 3, fd_map, NULL, argv, childEnvp);
+#endif
+
+        if (fd_map[0] != 0)
+            close(fd_map[0]);
+        if (fd_map[1] != 1)
+            close(fd_map[1]);
+        if (fd_map[2] != 2)
+            close(fd_map[2]);
+    }
+#else
+    process->md.pid = fork();
+#endif
+    if ((pid_t) -1 == process->md.pid) {
+        PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, errno);
+        PR_DELETE(process);
+        if (newEnvp) {
+            PR_DELETE(newEnvp);
+        }
+        return NULL;
+    } else if (0 == process->md.pid) {  /* the child process */
+        /*
+         * If the child process needs to exit, it must call _exit().
+         * Do not call exit(), because exit() will flush and close
+         * the standard I/O file descriptors, and hence corrupt
+         * the parent process's standard I/O data structures.
+         */
+
+#if !defined(NTO) && !defined(SYMBIAN)
+        if (attr) {
+            /* the osfd's to redirect stdin, stdout, and stderr to */
+            int in_osfd = -1, out_osfd = -1, err_osfd = -1;
+
+            if (attr->stdinFd
+                    && attr->stdinFd->secret->md.osfd != 0) {
+                in_osfd = attr->stdinFd->secret->md.osfd;
+                if (dup2(in_osfd, 0) != 0) {
+                    _exit(1);  /* failed */
+                }
+                flags = fcntl(0, F_GETFL, 0);
+                if (flags & O_NONBLOCK) {
+                    fcntl(0, F_SETFL, flags & ~O_NONBLOCK);
+                }
+            }
+            if (attr->stdoutFd
+                    && attr->stdoutFd->secret->md.osfd != 1) {
+                out_osfd = attr->stdoutFd->secret->md.osfd;
+                if (dup2(out_osfd, 1) != 1) {
+                    _exit(1);  /* failed */
+                }
+                flags = fcntl(1, F_GETFL, 0);
+                if (flags & O_NONBLOCK) {
+                    fcntl(1, F_SETFL, flags & ~O_NONBLOCK);
+                }
+            }
+            if (attr->stderrFd
+                    && attr->stderrFd->secret->md.osfd != 2) {
+                err_osfd = attr->stderrFd->secret->md.osfd;
+                if (dup2(err_osfd, 2) != 2) {
+                    _exit(1);  /* failed */
+                }
+                flags = fcntl(2, F_GETFL, 0);
+                if (flags & O_NONBLOCK) {
+                    fcntl(2, F_SETFL, flags & ~O_NONBLOCK);
+                }
+            }
+            if (in_osfd != -1) {
+                close(in_osfd);
+            }
+            if (out_osfd != -1 && out_osfd != in_osfd) {
+                close(out_osfd);
+            }
+            if (err_osfd != -1 && err_osfd != in_osfd
+                    && err_osfd != out_osfd) {
+                close(err_osfd);
+            }
+            if (attr->currentDirectory) {
+                if (chdir(attr->currentDirectory) < 0) {
+                    _exit(1);  /* failed */
+                }
+            }
+        }
+
+        if (childEnvp) {
+            (void)execve(path, argv, childEnvp);
+        } else {
+            /* Inherit the environment of the parent. */
+            (void)execv(path, argv);
+        }
+        /* Whoops! It returned. That's a bad sign. */
+        _exit(1);
+#endif /* !NTO */
+    }
+
+    if (newEnvp) {
+        PR_DELETE(newEnvp);
+    }
+
+#if defined(_PR_NATIVE_THREADS)
+    PR_Lock(pr_wp.ml);
+    if (0 == pr_wp.numProcs++) {
+        PR_NotifyCondVar(pr_wp.cv);
+    }
+    PR_Unlock(pr_wp.ml);
+#endif
+    return process;
+}
+
+#ifdef _PR_SHARE_CLONES
+
+struct pr_CreateProcOp {
+    const char *path;
+    char *const *argv;
+    char *const *envp;
+    const PRProcessAttr *attr;
+    PRProcess *process;
+    PRErrorCode prerror;
+    PRInt32 oserror;
+    PRBool done;
+    PRCondVar *doneCV;
+    struct pr_CreateProcOp *next;
+};
+
+PRProcess *
+_MD_CreateUnixProcess(
+    const char *path,
+    char *const *argv,
+    char *const *envp,
+    const PRProcessAttr *attr)
+{
+    struct pr_CreateProcOp *op;
+    PRProcess *proc;
+    int rv;
+
+    if (PR_CallOnce(&pr_wp.once, _MD_InitProcesses) == PR_FAILURE) {
+	return NULL;
+    }
+
+    op = PR_NEW(struct pr_CreateProcOp);
+    if (NULL == op) {
+	PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+	return NULL;
+    }
+    op->path = path;
+    op->argv = argv;
+    op->envp = envp;
+    op->attr = attr;
+    op->done = PR_FALSE;
+    op->doneCV = PR_NewCondVar(pr_wp.ml);
+    if (NULL == op->doneCV) {
+	PR_DELETE(op);
+	return NULL;
+    }
+    PR_Lock(pr_wp.ml);
+
+    /* add to the tail of op queue */
+    op->next = NULL;
+    if (pr_wp.opTail) {
+	pr_wp.opTail->next = op;
+	pr_wp.opTail = op;
+    } else {
+	PR_ASSERT(NULL == pr_wp.opHead);
+	pr_wp.opHead = pr_wp.opTail = op;
+    }
+
+    /* wake up the daemon thread */
+    do {
+        rv = write(pr_wp.pipefd[1], "", 1);
+    } while (-1 == rv && EINTR == errno);
+
+    while (op->done == PR_FALSE) {
+	PR_WaitCondVar(op->doneCV, PR_INTERVAL_NO_TIMEOUT);
+    }
+    PR_Unlock(pr_wp.ml);
+    PR_DestroyCondVar(op->doneCV);
+    proc = op->process;
+    if (!proc) {
+	PR_SetError(op->prerror, op->oserror);
+    }
+    PR_DELETE(op);
+    return proc;
+}
+
+#else  /* ! _PR_SHARE_CLONES */
+
+PRProcess *
+_MD_CreateUnixProcess(
+    const char *path,
+    char *const *argv,
+    char *const *envp,
+    const PRProcessAttr *attr)
+{
+    if (PR_CallOnce(&pr_wp.once, _MD_InitProcesses) == PR_FAILURE) {
+	return NULL;
+    }
+    return ForkAndExec(path, argv, envp, attr);
+}  /* _MD_CreateUnixProcess */
+
+#endif  /* _PR_SHARE_CLONES */
+
+/*
+ * The pid table is a hashtable.
+ *
+ * The number of buckets in the hashtable (NBUCKETS) must be a power of 2.
+ */
+#define NBUCKETS_LOG2 6
+#define NBUCKETS (1 << NBUCKETS_LOG2)
+#define PID_HASH_MASK ((pid_t) (NBUCKETS - 1))
+
+static pr_PidRecord *
+FindPidTable(pid_t pid)
+{
+    pr_PidRecord *pRec;
+    int keyHash = (int) (pid & PID_HASH_MASK);
+
+    pRec =  pr_wp.pidTable[keyHash];
+    while (pRec) {
+	if (pRec->pid == pid) {
+	    break;
+	}
+	pRec = pRec->next;
+    }
+    return pRec;
+}
+
+static void
+InsertPidTable(pr_PidRecord *pRec)
+{
+    int keyHash = (int) (pRec->pid & PID_HASH_MASK);
+
+    pRec->next = pr_wp.pidTable[keyHash];
+    pr_wp.pidTable[keyHash] = pRec;
+}
+
+static void
+DeletePidTable(pr_PidRecord *pRec)
+{
+    int keyHash = (int) (pRec->pid & PID_HASH_MASK);
+
+    if (pr_wp.pidTable[keyHash] == pRec) {
+	pr_wp.pidTable[keyHash] = pRec->next;
+    } else {
+	pr_PidRecord *pred, *cur;  /* predecessor and current */
+
+	pred = pr_wp.pidTable[keyHash];
+	cur = pred->next;
+	while (cur) {
+	    if (cur == pRec) {
+		pred->next = cur->next;
+		break;
+            }
+	    pred = cur;
+	    cur = cur->next;
+        }
+	PR_ASSERT(cur != NULL);
+    }
+}
+
+static int
+ExtractExitStatus(int rawExitStatus)
+{
+    /*
+     * We did not specify the WCONTINUED and WUNTRACED options
+     * for waitpid, so these two events should not be reported.
+     */
+    PR_ASSERT(!WIFSTOPPED(rawExitStatus));
+#ifdef WIFCONTINUED
+    PR_ASSERT(!WIFCONTINUED(rawExitStatus));
+#endif
+    if (WIFEXITED(rawExitStatus)) {
+	return WEXITSTATUS(rawExitStatus);
+    } else {
+	PR_ASSERT(WIFSIGNALED(rawExitStatus));
+	return _PR_SIGNALED_EXITSTATUS;
+    }
+}
+
+static void
+ProcessReapedChildInternal(pid_t pid, int status)
+{
+    pr_PidRecord *pRec;
+
+    pRec = FindPidTable(pid);
+    if (NULL == pRec) {
+        pRec = PR_NEW(pr_PidRecord);
+        pRec->pid = pid;
+        pRec->state = _PR_PID_REAPED;
+        pRec->exitStatus = ExtractExitStatus(status);
+        pRec->reapedCV = NULL;
+        InsertPidTable(pRec);
+    } else {
+        PR_ASSERT(pRec->state != _PR_PID_REAPED);
+        if (_PR_PID_DETACHED == pRec->state) {
+            PR_ASSERT(NULL == pRec->reapedCV);
+            DeletePidTable(pRec);
+            PR_DELETE(pRec);
+        } else {
+            PR_ASSERT(_PR_PID_WAITING == pRec->state);
+            PR_ASSERT(NULL != pRec->reapedCV);
+            pRec->exitStatus = ExtractExitStatus(status);
+            pRec->state = _PR_PID_REAPED;
+            PR_NotifyCondVar(pRec->reapedCV);
+        }
+    }
+}
+
+#if defined(_PR_NATIVE_THREADS)
+
+/*
+ * If all the threads are native threads, the daemon thread is
+ * simpler.  We don't need to catch the SIGCHLD signal.  We can
+ * just have the daemon thread block in waitpid().
+ */
+
+static void WaitPidDaemonThread(void *unused)
+{
+    pid_t pid;
+    int status;
+
+    while (1) {
+        PR_Lock(pr_wp.ml);
+        while (0 == pr_wp.numProcs) {
+            PR_WaitCondVar(pr_wp.cv, PR_INTERVAL_NO_TIMEOUT);
+        }
+        PR_Unlock(pr_wp.ml);
+
+	while (1) {
+	    do {
+	        pid = waitpid((pid_t) -1, &status, 0);
+	    } while ((pid_t) -1 == pid && EINTR == errno);
+
+            /*
+             * waitpid() cannot return 0 because we did not invoke it
+             * with the WNOHANG option.
+             */ 
+	    PR_ASSERT(0 != pid);
+
+            /*
+             * The only possible error code is ECHILD.  But if we do
+             * our accounting correctly, we should only call waitpid()
+             * when there is a child process to wait for.
+             */
+            PR_ASSERT((pid_t) -1 != pid);
+	    if ((pid_t) -1 == pid) {
+                break;
+            }
+
+	    PR_Lock(pr_wp.ml);
+            ProcessReapedChildInternal(pid, status);
+            pr_wp.numProcs--;
+            while (0 == pr_wp.numProcs) {
+                PR_WaitCondVar(pr_wp.cv, PR_INTERVAL_NO_TIMEOUT);
+            }
+	    PR_Unlock(pr_wp.ml);
+	}
+    }
+}
+
+#else /* _PR_NATIVE_THREADS */
+
+static void WaitPidDaemonThread(void *unused)
+{
+    PRPollDesc pd;
+    PRFileDesc *fd;
+    int rv;
+    char buf[128];
+    pid_t pid;
+    int status;
+#ifdef _PR_SHARE_CLONES
+    struct pr_CreateProcOp *op;
+#endif
+
+#ifdef _PR_SHARE_CLONES
+    pr_InstallSigchldHandler();
+#endif
+
+    fd = PR_ImportFile(pr_wp.pipefd[0]);
+    PR_ASSERT(NULL != fd);
+    pd.fd = fd;
+    pd.in_flags = PR_POLL_READ;
+
+    while (1) {
+        rv = PR_Poll(&pd, 1, PR_INTERVAL_NO_TIMEOUT);
+        PR_ASSERT(1 == rv);
+
+#ifdef _PR_SHARE_CLONES
+        if (pr_waitpid_daemon_exit) {
+            return;
+        }
+	PR_Lock(pr_wp.ml);
+#endif
+	    
+        do {
+            rv = read(pr_wp.pipefd[0], buf, sizeof(buf));
+        } while (sizeof(buf) == rv || (-1 == rv && EINTR == errno));
+
+#ifdef _PR_SHARE_CLONES
+	PR_Unlock(pr_wp.ml);
+	while ((op = pr_wp.opHead) != NULL) {
+	    op->process = ForkAndExec(op->path, op->argv,
+		    op->envp, op->attr);
+	    if (NULL == op->process) {
+		op->prerror = PR_GetError();
+		op->oserror = PR_GetOSError();
+	    }
+	    PR_Lock(pr_wp.ml);
+	    pr_wp.opHead = op->next;
+	    if (NULL == pr_wp.opHead) {
+		pr_wp.opTail = NULL;
+	    }
+	    op->done = PR_TRUE;
+	    PR_NotifyCondVar(op->doneCV);
+	    PR_Unlock(pr_wp.ml);
+	}
+#endif
+
+	while (1) {
+	    do {
+	        pid = waitpid((pid_t) -1, &status, WNOHANG);
+	    } while ((pid_t) -1 == pid && EINTR == errno);
+	    if (0 == pid) break;
+	    if ((pid_t) -1 == pid) {
+		/* must be because we have no child processes */
+		PR_ASSERT(ECHILD == errno);
+		break;
+            }
+
+	    PR_Lock(pr_wp.ml);
+            ProcessReapedChildInternal(pid, status);
+	    PR_Unlock(pr_wp.ml);
+	}
+    }
+}
+
+static void pr_SigchldHandler(int sig)
+{
+    int errnoCopy;
+    int rv;
+
+    errnoCopy = errno;
+
+    do {
+        rv = write(pr_wp.pipefd[1], "", 1);
+    } while (-1 == rv && EINTR == errno);
+
+#ifdef DEBUG
+    if (-1 == rv && EAGAIN != errno && EWOULDBLOCK != errno) {
+        char *msg = "cannot write to pipe\n";
+        write(2, msg, strlen(msg) + 1);
+        _exit(1);
+    }
+#endif
+
+    errno = errnoCopy;
+}
+
+static void pr_InstallSigchldHandler()
+{
+#if defined(HPUX) && defined(_PR_DCETHREADS)
+#error "HP-UX DCE threads have their own SIGCHLD handler"
+#endif
+
+    struct sigaction act, oact;
+    int rv;
+
+    act.sa_handler = pr_SigchldHandler;
+    sigemptyset(&act.sa_mask);
+    act.sa_flags = SA_NOCLDSTOP | SA_RESTART;
+    rv = sigaction(SIGCHLD, &act, &oact);
+    PR_ASSERT(0 == rv);
+    /* Make sure we are not overriding someone else's SIGCHLD handler */
+#ifndef _PR_SHARE_CLONES
+    PR_ASSERT(oact.sa_handler == SIG_DFL);
+#endif
+}
+
+#endif  /* !defined(_PR_NATIVE_THREADS) */
+
+static PRStatus _MD_InitProcesses(void)
+{
+#if !defined(_PR_NATIVE_THREADS)
+    int rv;
+    int flags;
+#endif
+
+#ifdef AIX
+    {
+        void *handle = dlopen(NULL, RTLD_NOW | RTLD_GLOBAL);
+        pr_wp.forkptr = (pid_t (*)(void)) dlsym(handle, "f_fork");
+        if (!pr_wp.forkptr) {
+            pr_wp.forkptr = fork;
+        }
+        dlclose(handle);
+    }
+#endif /* AIX */
+
+    pr_wp.ml = PR_NewLock();
+    PR_ASSERT(NULL != pr_wp.ml);
+
+#if defined(_PR_NATIVE_THREADS)
+    pr_wp.numProcs = 0;
+    pr_wp.cv = PR_NewCondVar(pr_wp.ml);
+    PR_ASSERT(NULL != pr_wp.cv);
+#else
+    rv = pipe(pr_wp.pipefd);
+    PR_ASSERT(0 == rv);
+    flags = fcntl(pr_wp.pipefd[0], F_GETFL, 0);
+    fcntl(pr_wp.pipefd[0], F_SETFL, flags | O_NONBLOCK);
+    flags = fcntl(pr_wp.pipefd[1], F_GETFL, 0);
+    fcntl(pr_wp.pipefd[1], F_SETFL, flags | O_NONBLOCK);
+
+#ifndef _PR_SHARE_CLONES
+    pr_InstallSigchldHandler();
+#endif
+#endif  /* !_PR_NATIVE_THREADS */
+
+    pr_wp.thread = PR_CreateThread(PR_SYSTEM_THREAD,
+	    WaitPidDaemonThread, NULL, PR_PRIORITY_NORMAL,
+#ifdef _PR_SHARE_CLONES
+            PR_GLOBAL_THREAD,
+#else
+	    PR_LOCAL_THREAD,
+#endif
+	    PR_JOINABLE_THREAD, 0);
+    PR_ASSERT(NULL != pr_wp.thread);
+
+    pr_wp.pidTable = (pr_PidRecord**)PR_CALLOC(NBUCKETS * sizeof(pr_PidRecord *));
+    PR_ASSERT(NULL != pr_wp.pidTable);
+    return PR_SUCCESS;
+}
+
+PRStatus _MD_DetachUnixProcess(PRProcess *process)
+{
+    PRStatus retVal = PR_SUCCESS;
+    pr_PidRecord *pRec;
+
+    PR_Lock(pr_wp.ml);
+    pRec = FindPidTable(process->md.pid);
+    if (NULL == pRec) {
+	pRec = PR_NEW(pr_PidRecord);
+	if (NULL == pRec) {
+	    PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+	    retVal = PR_FAILURE;
+	    goto done;
+	}
+	pRec->pid = process->md.pid;
+	pRec->state = _PR_PID_DETACHED;
+	pRec->reapedCV = NULL;
+	InsertPidTable(pRec);
+    } else {
+	PR_ASSERT(_PR_PID_REAPED == pRec->state);
+	if (_PR_PID_REAPED != pRec->state) {
+	    PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+	    retVal = PR_FAILURE;
+	} else {
+	    DeletePidTable(pRec);
+	    PR_ASSERT(NULL == pRec->reapedCV);
+	    PR_DELETE(pRec);
+	}
+    }
+    PR_DELETE(process);
+
+done:
+    PR_Unlock(pr_wp.ml);
+    return retVal;
+}
+
+PRStatus _MD_WaitUnixProcess(
+    PRProcess *process,
+    PRInt32 *exitCode)
+{
+    pr_PidRecord *pRec;
+    PRStatus retVal = PR_SUCCESS;
+    PRBool interrupted = PR_FALSE;
+
+    PR_Lock(pr_wp.ml);
+    pRec = FindPidTable(process->md.pid);
+    if (NULL == pRec) {
+	pRec = PR_NEW(pr_PidRecord);
+	if (NULL == pRec) {
+	    PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+	    retVal = PR_FAILURE;
+	    goto done;
+	}
+	pRec->pid = process->md.pid;
+	pRec->state = _PR_PID_WAITING;
+	pRec->reapedCV = PR_NewCondVar(pr_wp.ml);
+	if (NULL == pRec->reapedCV) {
+	    PR_DELETE(pRec);
+	    retVal = PR_FAILURE;
+	    goto done;
+	}
+	InsertPidTable(pRec);
+	while (!interrupted && _PR_PID_REAPED != pRec->state) {
+	    if (PR_WaitCondVar(pRec->reapedCV,
+		    PR_INTERVAL_NO_TIMEOUT) == PR_FAILURE
+		    && PR_GetError() == PR_PENDING_INTERRUPT_ERROR) {
+		interrupted = PR_TRUE;
+            }
+	}
+	if (_PR_PID_REAPED == pRec->state) {
+            if (exitCode) {
+                *exitCode = pRec->exitStatus;
+            }
+	} else {
+	    PR_ASSERT(interrupted);
+	    retVal = PR_FAILURE;
+	}
+	DeletePidTable(pRec);
+	PR_DestroyCondVar(pRec->reapedCV);
+	PR_DELETE(pRec);
+    } else {
+	PR_ASSERT(_PR_PID_REAPED == pRec->state);
+	PR_ASSERT(NULL == pRec->reapedCV);
+	DeletePidTable(pRec);
+        if (exitCode) {
+            *exitCode = pRec->exitStatus;
+        }
+	PR_DELETE(pRec);
+    }
+    PR_DELETE(process);
+
+done:
+    PR_Unlock(pr_wp.ml);
+    return retVal;
+}  /* _MD_WaitUnixProcess */
+
+PRStatus _MD_KillUnixProcess(PRProcess *process)
+{
+    PRErrorCode prerror;
+    PRInt32 oserror;
+
+#ifdef SYMBIAN
+    /* In Symbian OS, we can not kill other process with Open C */
+    PR_SetError(PR_OPERATION_NOT_SUPPORTED_ERROR, oserror);
+    return PR_FAILURE;
+#else
+    if (kill(process->md.pid, SIGKILL) == 0) {
+	return PR_SUCCESS;
+    }
+    oserror = errno;
+    switch (oserror) {
+        case EPERM:
+	    prerror = PR_NO_ACCESS_RIGHTS_ERROR;
+	    break;
+        case ESRCH:
+	    prerror = PR_INVALID_ARGUMENT_ERROR;
+	    break;
+        default:
+	    prerror = PR_UNKNOWN_ERROR;
+	    break;
+    }
+    PR_SetError(prerror, oserror);
+    return PR_FAILURE;
+#endif
+}  /* _MD_KillUnixProcess */
diff --git a/nsprpub/pr/src/md/unix/uxrng.c b/nsprpub/pr/src/md/unix/uxrng.c
new file mode 100644
index 000000000..da2f7e9fe
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/uxrng.c
@@ -0,0 +1,252 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+#include "primpl.h"
+
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/time.h>
+
+
+#if defined(SOLARIS)
+
+static size_t
+GetHighResClock(void *buf, size_t maxbytes)
+{
+    hrtime_t t;
+    t = gethrtime();
+    if (t) {
+	    return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));
+    }
+    return 0;
+}
+
+#elif defined(HPUX)
+
+#ifdef __ia64
+#include <ia64/sys/inline.h>
+
+static size_t
+GetHighResClock(void *buf, size_t maxbytes)
+{
+    PRUint64 t;
+
+#ifdef __GNUC__
+    __asm__ __volatile__("mov %0 = ar.itc" : "=r" (t));
+#else
+    t = _Asm_mov_from_ar(_AREG44);
+#endif
+    return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));
+}
+#else
+static size_t
+GetHighResClock(void *buf, size_t maxbytes)
+{
+    extern int ret_cr16();
+    int cr16val;
+
+    cr16val = ret_cr16();
+    return(_pr_CopyLowBits(buf, maxbytes, &cr16val, sizeof(cr16val)));
+}
+#endif
+
+#elif defined(OSF1)
+
+#include <c_asm.h>
+
+/*
+ * Use the "get the cycle counter" instruction on the alpha.
+ * The low 32 bits completely turn over in less than a minute.
+ * The high 32 bits are some non-counter gunk that changes sometimes.
+ */
+static size_t
+GetHighResClock(void *buf, size_t maxbytes)
+{
+    unsigned long t;
+
+#ifdef __GNUC__
+    __asm__("rpcc %0" : "=r" (t));
+#else
+    t = asm("rpcc %v0");
+#endif
+    return _pr_CopyLowBits(buf, maxbytes, &t, sizeof(t));
+}
+
+#elif defined(AIX)
+
+static size_t
+GetHighResClock(void *buf, size_t maxbytes)
+{
+    return 0;
+}
+
+#elif (defined(LINUX) || defined(FREEBSD) || defined(__FreeBSD_kernel__) \
+    || defined(NETBSD) || defined(__NetBSD_kernel__) || defined(OPENBSD) \
+    || defined(SYMBIAN) || defined(__GNU__))
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+static int      fdDevURandom;
+static PRCallOnceType coOpenDevURandom;
+
+static PRStatus OpenDevURandom( void )
+{
+    fdDevURandom = open( "/dev/urandom", O_RDONLY );
+    return((-1 == fdDevURandom)? PR_FAILURE : PR_SUCCESS );
+} /* end OpenDevURandom() */
+
+static size_t GetDevURandom( void *buf, size_t size )
+{
+    int bytesIn;
+    int rc;
+
+    rc = PR_CallOnce( &coOpenDevURandom, OpenDevURandom );
+    if ( PR_FAILURE == rc ) {
+        _PR_MD_MAP_OPEN_ERROR( errno );
+        return(0);
+    }
+
+    bytesIn = read( fdDevURandom, buf, size );
+    if ( -1 == bytesIn ) {
+        _PR_MD_MAP_READ_ERROR( errno );
+        return(0);
+    }
+
+    return( bytesIn );
+} /* end GetDevURandom() */
+
+static size_t
+GetHighResClock(void *buf, size_t maxbytes)
+{             
+    return(GetDevURandom( buf, maxbytes ));
+}
+
+#elif defined(IRIX)
+#include <fcntl.h>
+#undef PRIVATE
+#include <sys/mman.h>
+#include <sys/syssgi.h>
+#include <sys/immu.h>
+#include <sys/systeminfo.h>
+#include <sys/utsname.h>
+
+static size_t GetHighResClock(void *buf, size_t maxbuf)
+{
+    unsigned phys_addr, raddr, cycleval;
+    static volatile unsigned *iotimer_addr = NULL;
+    static int tries = 0;
+    static int cntr_size;
+    int mfd;
+    unsigned s0[2];
+
+#ifndef SGI_CYCLECNTR_SIZE
+#define SGI_CYCLECNTR_SIZE      165     /* Size user needs to use to read CC */
+#endif
+
+    if (iotimer_addr == NULL) {
+	    if (tries++ > 1) {
+	        /* Don't keep trying if it didn't work */
+	        return 0;
+	    }
+
+	    /*
+	    ** For SGI machines we can use the cycle counter, if it has one,
+	    ** to generate some truly random numbers
+	    */
+	    phys_addr = syssgi(SGI_QUERY_CYCLECNTR, &cycleval);
+	    if (phys_addr) {
+	        int pgsz = getpagesize();
+	        int pgoffmask = pgsz - 1;
+
+	        raddr = phys_addr & ~pgoffmask;
+	        mfd = open("/dev/mmem", O_RDONLY);
+	        if (mfd < 0) {
+    		    return 0;
+	        }
+	        iotimer_addr = (unsigned *)
+		    mmap(0, pgoffmask, PROT_READ, MAP_PRIVATE, mfd, (int)raddr);
+	        if (iotimer_addr == (unsigned*)-1) {
+	    	    close(mfd);
+		        iotimer_addr = NULL;
+		        return 0;
+	        }
+	        iotimer_addr = (unsigned*)
+		    ((__psint_t)iotimer_addr | (phys_addr & pgoffmask));
+	        /*
+	         * The file 'mfd' is purposefully not closed.
+	         */
+	        cntr_size = syssgi(SGI_CYCLECNTR_SIZE);
+	        if (cntr_size < 0) {
+    		    struct utsname utsinfo;
+
+		        /* 
+		         * We must be executing on a 6.0 or earlier system, since the
+		         * SGI_CYCLECNTR_SIZE call is not supported.
+		         * 
+		         * The only pre-6.1 platforms with 64-bit counters are
+		         * IP19 and IP21 (Challenge, PowerChallenge, Onyx).
+		         */
+		        uname(&utsinfo);
+		        if (!strncmp(utsinfo.machine, "IP19", 4) ||
+		            !strncmp(utsinfo.machine, "IP21", 4))
+			        cntr_size = 64;
+		        else
+			        cntr_size = 32;
+	        }
+	        cntr_size /= 8;	/* Convert from bits to bytes */
+	    }
+    }
+
+    s0[0] = *iotimer_addr;
+    if (cntr_size > 4)
+	s0[1] = *(iotimer_addr + 1);
+    memcpy(buf, (char *)&s0[0], cntr_size);
+    return _pr_CopyLowBits(buf, maxbuf, &s0, cntr_size);
+}
+
+#elif defined(SCO) || defined(UNIXWARE) || defined(BSDI) || defined(NTO) \
+    || defined(QNX) || defined(DARWIN) || defined(RISCOS)
+#include <sys/times.h>
+
+static size_t
+GetHighResClock(void *buf, size_t maxbytes)
+{
+    int ticks;
+    struct tms buffer;
+
+    ticks=times(&buffer);
+    return _pr_CopyLowBits(buf, maxbytes, &ticks, sizeof(ticks));
+}
+#else
+#error! Platform undefined
+#endif /* defined(SOLARIS) */
+
+extern PRSize _PR_MD_GetRandomNoise( void *buf, PRSize size )
+{
+    struct timeval tv;
+    int n = 0;
+    int s;
+
+    n += GetHighResClock(buf, size);
+    size -= n;
+
+    GETTIMEOFDAY(&tv);
+
+    if ( size > 0 ) {
+        s = _pr_CopyLowBits((char*)buf+n, size, &tv.tv_usec, sizeof(tv.tv_usec));
+        size -= s;
+        n += s;
+    }
+    if ( size > 0 ) {
+        s = _pr_CopyLowBits((char*)buf+n, size, &tv.tv_sec, sizeof(tv.tv_usec));
+        size -= s;
+        n += s;
+    }
+
+    return n;
+} /* end _PR_MD_GetRandomNoise() */
diff --git a/nsprpub/pr/src/md/unix/uxshm.c b/nsprpub/pr/src/md/unix/uxshm.c
new file mode 100644
index 000000000..dec4e3a7a
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/uxshm.c
@@ -0,0 +1,643 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+** uxshm.c -- Unix Implementations NSPR Named Shared Memory
+**
+**
+** lth. Jul-1999.
+**
+*/
+#include <string.h>
+#include <prshm.h>
+#include <prerr.h>
+#include <prmem.h>
+#include "primpl.h"       
+#include <fcntl.h>
+
+extern PRLogModuleInfo *_pr_shm_lm;
+
+
+#define NSPR_IPC_SHM_KEY 'b'
+/*
+** Implementation for System V
+*/
+#if defined PR_HAVE_SYSV_NAMED_SHARED_MEMORY
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#define _MD_OPEN_SHARED_MEMORY _MD_OpenSharedMemory
+#define _MD_ATTACH_SHARED_MEMORY _MD_AttachSharedMemory
+#define _MD_DETACH_SHARED_MEMORY _MD_DetachSharedMemory
+#define _MD_CLOSE_SHARED_MEMORY _MD_CloseSharedMemory
+#define _MD_DELETE_SHARED_MEMORY  _MD_DeleteSharedMemory
+
+extern PRSharedMemory * _MD_OpenSharedMemory( 
+    const char *name,
+    PRSize      size,
+    PRIntn      flags,
+    PRIntn      mode
+)
+{
+    PRStatus rc = PR_SUCCESS;
+    key_t   key;
+    PRSharedMemory *shm;
+    char        ipcname[PR_IPC_NAME_SIZE];
+
+    rc = _PR_MakeNativeIPCName( name, ipcname, PR_IPC_NAME_SIZE, _PRIPCShm );
+    if ( PR_FAILURE == rc )
+    {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_OpenSharedMemory(): _PR_MakeNativeIPCName() failed: %s", name ));
+        return( NULL );
+    }
+
+    shm = PR_NEWZAP( PRSharedMemory );
+    if ( NULL == shm ) 
+    {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0 );
+        PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: New PRSharedMemory out of memory")); 
+        return( NULL );
+    }
+
+    shm->ipcname = (char*)PR_MALLOC( strlen( ipcname ) + 1 );
+    if ( NULL == shm->ipcname )
+    {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0 );
+        PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: New shm->ipcname out of memory")); 
+        PR_DELETE( shm );
+        return( NULL );
+    }
+
+    /* copy args to struct */
+    strcpy( shm->ipcname, ipcname );
+    shm->size = size; 
+    shm->mode = mode; 
+    shm->flags = flags;
+    shm->ident = _PR_SHM_IDENT;
+
+    /* create the file first */
+    if ( flags & PR_SHM_CREATE )  {
+        int osfd = open( shm->ipcname, (O_RDWR | O_CREAT), shm->mode );
+        if ( -1 == osfd ) {
+            _PR_MD_MAP_OPEN_ERROR( errno );
+            PR_FREEIF( shm->ipcname );
+            PR_DELETE( shm );
+            return( NULL );
+        } 
+        if ( close(osfd) == -1 ) {
+            _PR_MD_MAP_CLOSE_ERROR( errno );
+            PR_FREEIF( shm->ipcname );
+            PR_DELETE( shm );
+            return( NULL );
+        }
+    }
+
+    /* hash the shm.name to an ID */
+    key = ftok( shm->ipcname, NSPR_IPC_SHM_KEY );
+    if ( -1 == key )
+    {
+        rc = PR_FAILURE;
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_OpenSharedMemory(): ftok() failed on name: %s", shm->ipcname));
+        PR_FREEIF( shm->ipcname );
+        PR_DELETE( shm );
+        return( NULL );
+    }
+
+    /* get the shared memory */
+    if ( flags & PR_SHM_CREATE )  {
+        shm->id = shmget( key, shm->size, ( shm->mode | IPC_CREAT|IPC_EXCL));
+        if ( shm->id >= 0 ) {
+            return( shm );
+        }
+        if ((errno == EEXIST) && (flags & PR_SHM_EXCL)) {
+            PR_SetError( PR_FILE_EXISTS_ERROR, errno );
+            PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+                ("_MD_OpenSharedMemory(): shmget() exclusive failed, errno: %d", errno));
+            PR_FREEIF(shm->ipcname);
+            PR_DELETE(shm);
+            return(NULL);
+        }
+    } 
+
+    shm->id = shmget( key, shm->size, shm->mode );
+    if ( -1 == shm->id ) {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_OpenSharedMemory(): shmget() failed, errno: %d", errno));
+        PR_FREEIF(shm->ipcname);
+        PR_DELETE(shm);
+        return(NULL);
+    }
+
+    return( shm );
+} /* end _MD_OpenSharedMemory() */
+
+extern void * _MD_AttachSharedMemory( PRSharedMemory *shm, PRIntn flags )
+{
+    void        *addr;
+    PRUint32    aFlags = shm->mode;
+
+    PR_ASSERT( shm->ident == _PR_SHM_IDENT );
+
+    aFlags |= (flags & PR_SHM_READONLY )? SHM_RDONLY : 0;
+
+    addr = shmat( shm->id, NULL, aFlags );
+    if ( (void*)-1 == addr )
+    {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_AttachSharedMemory(): shmat() failed on name: %s, OsError: %d", 
+                shm->ipcname, PR_GetOSError() ));
+        addr = NULL;
+    }
+
+    return addr;
+}    
+
+extern PRStatus _MD_DetachSharedMemory( PRSharedMemory *shm, void *addr )
+{
+    PRStatus rc = PR_SUCCESS;
+    PRIntn   urc;
+
+    PR_ASSERT( shm->ident == _PR_SHM_IDENT );
+
+    urc = shmdt( addr );
+    if ( -1 == urc )
+    {
+        rc = PR_FAILURE;
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DetachSharedMemory(): shmdt() failed on name: %s", shm->ipcname ));
+    }
+
+    return rc;
+}    
+
+extern PRStatus _MD_CloseSharedMemory( PRSharedMemory *shm )
+{
+    PR_ASSERT( shm->ident == _PR_SHM_IDENT );
+
+    PR_FREEIF(shm->ipcname);
+    PR_DELETE(shm);
+
+    return PR_SUCCESS;
+}    
+
+extern PRStatus _MD_DeleteSharedMemory( const char *name )
+{
+    PRStatus rc = PR_SUCCESS;
+    key_t   key;
+    int     id;
+    PRIntn  urc;
+    char        ipcname[PR_IPC_NAME_SIZE];
+
+    rc = _PR_MakeNativeIPCName( name, ipcname, PR_IPC_NAME_SIZE, _PRIPCShm );
+    if ( PR_FAILURE == rc )
+    {
+        PR_SetError( PR_UNKNOWN_ERROR , errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DeleteSharedMemory(): _PR_MakeNativeIPCName() failed: %s", name ));
+        return(PR_FAILURE);
+    }
+
+    /* create the file first */ 
+    {
+        int osfd = open( ipcname, (O_RDWR | O_CREAT), 0666 );
+        if ( -1 == osfd ) {
+            _PR_MD_MAP_OPEN_ERROR( errno );
+            return( PR_FAILURE );
+        } 
+        if ( close(osfd) == -1 ) {
+            _PR_MD_MAP_CLOSE_ERROR( errno );
+            return( PR_FAILURE );
+        }
+    }
+
+    /* hash the shm.name to an ID */
+    key = ftok( ipcname, NSPR_IPC_SHM_KEY );
+    if ( -1 == key )
+    {
+        rc = PR_FAILURE;
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DeleteSharedMemory(): ftok() failed on name: %s", ipcname));
+    }
+
+#ifdef SYMBIAN
+    /* In Symbian OS the system imposed minimum is 1 byte, instead of ZERO */
+    id = shmget( key, 1, 0 );
+#else
+    id = shmget( key, 0, 0 );
+#endif
+    if ( -1 == id ) {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DeleteSharedMemory(): shmget() failed, errno: %d", errno));
+        return(PR_FAILURE);
+    }
+
+    urc = shmctl( id, IPC_RMID, NULL );
+    if ( -1 == urc )
+    {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DeleteSharedMemory(): shmctl() failed on name: %s", ipcname ));
+        return(PR_FAILURE);
+    }
+
+    urc = unlink( ipcname );
+    if ( -1 == urc ) {
+        _PR_MD_MAP_UNLINK_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DeleteSharedMemory(): unlink() failed: %s", ipcname ));
+        return(PR_FAILURE);
+    }
+
+    return rc;
+}  /* end _MD_DeleteSharedMemory() */
+
+/*
+** Implementation for Posix
+*/
+#elif defined PR_HAVE_POSIX_NAMED_SHARED_MEMORY
+#include <sys/mman.h>
+
+#define _MD_OPEN_SHARED_MEMORY _MD_OpenSharedMemory
+#define _MD_ATTACH_SHARED_MEMORY _MD_AttachSharedMemory
+#define _MD_DETACH_SHARED_MEMORY _MD_DetachSharedMemory
+#define _MD_CLOSE_SHARED_MEMORY _MD_CloseSharedMemory
+#define _MD_DELETE_SHARED_MEMORY  _MD_DeleteSharedMemory
+
+struct _MDSharedMemory {
+    int     handle;
+};
+
+extern PRSharedMemory * _MD_OpenSharedMemory( 
+    const char *name,
+    PRSize      size,
+    PRIntn      flags,
+    PRIntn      mode
+)
+{
+    PRStatus    rc = PR_SUCCESS;
+    PRInt32     end;
+    PRSharedMemory *shm;
+    char        ipcname[PR_IPC_NAME_SIZE];
+
+    rc = _PR_MakeNativeIPCName( name, ipcname, PR_IPC_NAME_SIZE, _PRIPCShm );
+    if ( PR_FAILURE == rc )
+    {
+        PR_SetError( PR_UNKNOWN_ERROR , errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_OpenSharedMemory(): _PR_MakeNativeIPCName() failed: %s", name ));
+        return( NULL );
+    }
+
+    shm = PR_NEWZAP( PRSharedMemory );
+    if ( NULL == shm ) 
+    {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0 );
+        PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: New PRSharedMemory out of memory")); 
+        return( NULL );
+    }
+
+    shm->ipcname = PR_MALLOC( strlen( ipcname ) + 1 );
+    if ( NULL == shm->ipcname )
+    {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0 );
+        PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: New shm->ipcname out of memory")); 
+        return( NULL );
+    }
+
+    /* copy args to struct */
+    strcpy( shm->ipcname, ipcname );
+    shm->size = size; 
+    shm->mode = mode;
+    shm->flags = flags;
+    shm->ident = _PR_SHM_IDENT;
+
+    /*
+    ** Create the shared memory
+    */
+    if ( flags & PR_SHM_CREATE )  {
+        int oflag = (O_CREAT | O_RDWR);
+        
+        if ( flags & PR_SHM_EXCL )
+            oflag |= O_EXCL;
+        shm->id = shm_open( shm->ipcname, oflag, shm->mode );
+    } else {
+        shm->id = shm_open( shm->ipcname, O_RDWR, shm->mode );
+    }
+
+    if ( -1 == shm->id )  {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_OpenSharedMemory(): shm_open failed: %s, OSError: %d",
+                shm->ipcname, PR_GetOSError())); 
+        PR_DELETE( shm->ipcname );
+        PR_DELETE( shm );
+        return(NULL);
+    }
+
+    end = ftruncate( shm->id, shm->size );
+    if ( -1 == end ) {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_OpenSharedMemory(): ftruncate failed, OSError: %d",
+                PR_GetOSError()));
+        PR_DELETE( shm->ipcname );
+        PR_DELETE( shm );
+        return(NULL);
+    }
+
+    return(shm);
+} /* end _MD_OpenSharedMemory() */
+
+extern void * _MD_AttachSharedMemory( PRSharedMemory *shm, PRIntn flags )
+{
+    void        *addr;
+    PRIntn      prot = (PROT_READ | PROT_WRITE);
+
+    PR_ASSERT( shm->ident == _PR_SHM_IDENT );
+
+    if ( PR_SHM_READONLY == flags)
+        prot ^= PROT_WRITE;
+
+    addr = mmap( (void*)0, shm->size, prot, MAP_SHARED, shm->id, 0 );
+    if ((void*)-1 == addr )
+    {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_AttachSharedMemory(): mmap failed: %s, errno: %d",
+                shm->ipcname, PR_GetOSError()));
+        addr = NULL;
+    } else {
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_AttachSharedMemory(): name: %s, attached at: %p", shm->ipcname, addr));
+    }
+    
+    return addr;
+}    
+
+extern PRStatus _MD_DetachSharedMemory( PRSharedMemory *shm, void *addr )
+{
+    PRStatus    rc = PR_SUCCESS;
+    PRIntn      urc;
+
+    PR_ASSERT( shm->ident == _PR_SHM_IDENT );
+
+    urc = munmap( addr, shm->size );
+    if ( -1 == urc )
+    {
+        rc = PR_FAILURE;
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DetachSharedMemory(): munmap failed: %s, errno: %d", 
+                shm->ipcname, PR_GetOSError()));
+    }
+    return rc;
+}    
+
+extern PRStatus _MD_CloseSharedMemory( PRSharedMemory *shm )
+{
+    int urc;
+    
+    PR_ASSERT( shm->ident == _PR_SHM_IDENT );
+
+    urc = close( shm->id );
+    if ( -1 == urc ) {
+        _PR_MD_MAP_CLOSE_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_CloseSharedMemory(): close() failed, error: %d", PR_GetOSError()));
+        return(PR_FAILURE);
+    }
+    PR_DELETE( shm->ipcname );
+    PR_DELETE( shm );
+    return PR_SUCCESS;
+}    
+
+extern PRStatus _MD_DeleteSharedMemory( const char *name )
+{
+    PRStatus    rc = PR_SUCCESS;
+    PRUintn     urc;
+    char        ipcname[PR_IPC_NAME_SIZE];
+
+    rc = _PR_MakeNativeIPCName( name, ipcname, PR_IPC_NAME_SIZE, _PRIPCShm );
+    if ( PR_FAILURE == rc )
+    {
+        PR_SetError( PR_UNKNOWN_ERROR , errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_OpenSharedMemory(): _PR_MakeNativeIPCName() failed: %s", name ));
+        return rc;
+    }
+
+    urc = shm_unlink( ipcname );
+    if ( -1 == urc ) {
+        rc = PR_FAILURE;
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DeleteSharedMemory(): shm_unlink failed: %s, errno: %d", 
+                ipcname, PR_GetOSError()));
+    } else {
+        PR_LOG( _pr_shm_lm, PR_LOG_DEBUG, 
+            ("_MD_DeleteSharedMemory(): %s, success", ipcname));
+    }
+
+    return rc;
+} /* end _MD_DeleteSharedMemory() */
+#endif
+
+
+
+/*
+** Unix implementation for anonymous memory (file) mapping
+*/
+extern PRLogModuleInfo *_pr_shma_lm;
+
+#include <unistd.h>
+
+extern PRFileMap* _md_OpenAnonFileMap( 
+    const char *dirName,
+    PRSize      size,
+    PRFileMapProtect prot
+)
+{
+    PRFileMap   *fm = NULL;
+    PRFileDesc  *fd;
+    int         osfd;
+    PRIntn      urc;
+    PRIntn      mode = 0600;
+    char        *genName;
+    pid_t       pid = getpid(); /* for generating filename */
+    PRThread    *tid = PR_GetCurrentThread(); /* for generating filename */
+    int         incr; /* for generating filename */
+    const int   maxTries = 20; /* maximum # attempts at a unique filename */
+    PRInt64     size64; /* 64-bit version of 'size' */
+
+    /*
+    ** generate a filename from input and runtime environment
+    ** open the file, unlink the file.
+    ** make maxTries number of attempts at uniqueness in the filename
+    */
+    for ( incr = 0; incr < maxTries ; incr++ ) {
+#if defined(SYMBIAN)
+#define NSPR_AFM_FILENAME "%s\\NSPR-AFM-%d-%p.%d"
+#else
+#define NSPR_AFM_FILENAME "%s/.NSPR-AFM-%d-%p.%d"
+#endif
+        genName = PR_smprintf( NSPR_AFM_FILENAME,
+            dirName, (int) pid, tid, incr );
+        if ( NULL == genName ) {
+            PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+                ("_md_OpenAnonFileMap(): PR_snprintf(): failed, generating filename"));
+            goto Finished;
+        }
+        
+        /* create the file */
+        osfd = open( genName, (O_CREAT | O_EXCL | O_RDWR), mode );
+        if ( -1 == osfd ) {
+            if ( EEXIST == errno )  {
+                PR_smprintf_free( genName );
+                continue; /* name exists, try again */
+            } else {
+                _PR_MD_MAP_OPEN_ERROR( errno );
+                PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+                    ("_md_OpenAnonFileMap(): open(): failed, filename: %s, errno: %d", 
+                        genName, PR_GetOSError()));
+                PR_smprintf_free( genName );
+                goto Finished;
+            }
+        }
+        break; /* name generation and open successful, break; */
+    } /* end for() */
+
+    if ( incr == maxTries ) {
+        PR_ASSERT( -1 == osfd );
+        PR_ASSERT( EEXIST == errno );
+        _PR_MD_MAP_OPEN_ERROR( errno );
+        goto Finished;
+    }
+
+    urc = unlink( genName );
+#if defined(SYMBIAN) && defined(__WINS__)
+    /* If it is being used by the system or another process, Symbian OS 
+     * Emulator(WINS) considers this an error. */
+    if ( -1 == urc && EACCES != errno ) {
+#else
+    if ( -1 == urc ) {
+#endif
+        _PR_MD_MAP_UNLINK_ERROR( errno );
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("_md_OpenAnonFileMap(): failed on unlink(), errno: %d", errno));
+        PR_smprintf_free( genName );
+        close( osfd );
+        goto Finished;        
+    }
+    PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+        ("_md_OpenAnonFileMap(): unlink(): %s", genName ));
+
+    PR_smprintf_free( genName );
+
+    fd = PR_ImportFile( osfd );
+    if ( NULL == fd ) {
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("_md_OpenAnonFileMap(): PR_ImportFile(): failed"));
+        goto Finished;        
+    }
+    PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+        ("_md_OpenAnonFileMap(): fd: %p", fd ));
+
+    urc = ftruncate( fd->secret->md.osfd, size );
+    if ( -1 == urc ) {
+        _PR_MD_MAP_DEFAULT_ERROR( errno );
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("_md_OpenAnonFileMap(): failed on ftruncate(), errno: %d", errno));
+        PR_Close( fd );
+        goto Finished;        
+    }
+    PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+        ("_md_OpenAnonFileMap(): ftruncate(): size: %d", size ));
+
+    LL_UI2L(size64, size);  /* PRSize (size_t) is unsigned */
+    fm = PR_CreateFileMap( fd, size64, prot );
+    if ( NULL == fm )  {
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("PR_OpenAnonFileMap(): failed"));
+        PR_Close( fd );
+        goto Finished;        
+    }
+    fm->md.isAnonFM = PR_TRUE; /* set fd close */
+
+    PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+        ("_md_OpenAnonFileMap(): PR_CreateFileMap(): fm: %p", fm ));
+
+Finished:    
+    return(fm);
+} /* end md_OpenAnonFileMap() */
+
+/*
+** _md_ExportFileMapAsString()
+**
+**
+*/
+extern PRStatus _md_ExportFileMapAsString(
+    PRFileMap *fm,
+    PRSize    bufSize,
+    char      *buf
+)
+{
+    PRIntn  written;
+    PRIntn  prot = (PRIntn)fm->prot;
+    
+    written = PR_snprintf( buf, bufSize, "%ld:%d",
+        fm->fd->secret->md.osfd, prot );
+        
+    return((written == -1)? PR_FAILURE : PR_SUCCESS);
+} /* end _md_ExportFileMapAsString() */
+
+
+extern PRFileMap * _md_ImportFileMapFromString(
+    const char *fmstring
+)
+{
+    PRStatus    rc;
+    PRInt32     osfd;
+    PRIntn      prot; /* really: a PRFileMapProtect */
+    PRFileDesc  *fd;
+    PRFileMap   *fm = NULL; /* default return value */
+    PRFileInfo64 info;
+
+    PR_sscanf( fmstring, "%ld:%d", &osfd, &prot );
+
+    /* import the os file descriptor */
+    fd = PR_ImportFile( osfd );
+    if ( NULL == fd ) {
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("_md_ImportFileMapFromString(): PR_ImportFile() failed"));
+        goto Finished;
+    }
+
+    rc = PR_GetOpenFileInfo64( fd, &info );
+    if ( PR_FAILURE == rc )  {
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("_md_ImportFileMapFromString(): PR_GetOpenFileInfo64() failed"));    
+        goto Finished;
+    }
+
+    fm = PR_CreateFileMap( fd, info.size, (PRFileMapProtect)prot );
+    if ( NULL == fm ) {
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("_md_ImportFileMapFromString(): PR_CreateFileMap() failed"));    
+    }
+
+Finished:
+    return(fm);
+} /* end _md_ImportFileMapFromString() */
diff --git a/nsprpub/pr/src/md/unix/uxwrap.c b/nsprpub/pr/src/md/unix/uxwrap.c
new file mode 100644
index 000000000..3f8e149ef
--- /dev/null
+++ b/nsprpub/pr/src/md/unix/uxwrap.c
@@ -0,0 +1,513 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ *------------------------------------------------------------------------
+ * File: uxwrap.c
+ *
+ *     Our wrapped versions of the Unix select() and poll() system calls.
+ *
+ *------------------------------------------------------------------------
+ */
+
+#include "primpl.h"
+
+#if defined(_PR_PTHREADS) || defined(_PR_GLOBAL_THREADS_ONLY) || defined(QNX)
+/* Do not wrap select() and poll(). */
+#else  /* defined(_PR_PTHREADS) || defined(_PR_GLOBAL_THREADS_ONLY) */
+/* The include files for select() */
+#ifdef IRIX
+#include <unistd.h>
+#include <bstring.h>
+#endif
+
+#include <string.h>
+#include <sys/types.h>
+#include <sys/time.h>
+
+#define ZAP_SET(_to, _width)				      \
+    PR_BEGIN_MACRO					      \
+	memset(_to, 0,					      \
+	       ((_width + 8*sizeof(int)-1) / (8*sizeof(int))) \
+		* sizeof(int)				      \
+	       );					      \
+    PR_END_MACRO
+
+/* see comments in ns/cmd/xfe/mozilla.c (look for "PR_XGetXtHackFD") */
+static int _pr_xt_hack_fd = -1;
+ 
+int PR_XGetXtHackFD(void)
+{
+    int fds[2];
+ 
+    if (_pr_xt_hack_fd == -1) {
+        if (!pipe(fds)) {
+            _pr_xt_hack_fd = fds[0];
+        }
+    }
+    return _pr_xt_hack_fd;
+}
+
+static int (*_pr_xt_hack_okayToReleaseXLock)(void) = 0;
+
+void PR_SetXtHackOkayToReleaseXLockFn(int (*fn)(void))
+{
+    _pr_xt_hack_okayToReleaseXLock = fn; 
+}
+
+
+/*
+ *-----------------------------------------------------------------------
+ *  select() --
+ *
+ *    Wrap up the select system call so that we can deschedule
+ *    a thread that tries to wait for i/o.
+ *
+ *-----------------------------------------------------------------------
+ */
+
+#if defined(HPUX9)
+int select(size_t width, int *rl, int *wl, int *el, const struct timeval *tv)
+#elif defined(AIX_RENAME_SELECT)
+int wrap_select(unsigned long width, void *rl, void *wl, void *el,
+        struct timeval *tv)
+#elif defined(_PR_SELECT_CONST_TIMEVAL)
+int select(int width, fd_set *rd, fd_set *wr, fd_set *ex,
+        const struct timeval *tv)
+#else
+int select(int width, fd_set *rd, fd_set *wr, fd_set *ex, struct timeval *tv)
+#endif
+{
+    int osfd;
+    _PRUnixPollDesc *unixpds, *unixpd, *eunixpd;
+    PRInt32 pdcnt;
+    PRIntervalTime timeout;
+    int retVal;
+#if defined(HPUX9) || defined(AIX_RENAME_SELECT)
+    fd_set *rd = (fd_set*) rl;
+    fd_set *wr = (fd_set*) wl;
+    fd_set *ex = (fd_set*) el;
+#endif
+
+#if 0
+    /*
+     * Easy special case: zero timeout.  Simply call the native
+     * select() with no fear of blocking.
+     */
+    if (tv != NULL && tv->tv_sec == 0 && tv->tv_usec == 0) {
+#if defined(HPUX9) || defined(AIX_RENAME_SELECT)
+        return _MD_SELECT(width, rl, wl, el, tv);
+#else
+        return _MD_SELECT(width, rd, wr, ex, tv);
+#endif
+    }
+#endif
+
+    if (!_pr_initialized) {
+        _PR_ImplicitInitialization();
+    }
+		
+#ifndef _PR_LOCAL_THREADS_ONLY
+    if (_PR_IS_NATIVE_THREAD(_PR_MD_CURRENT_THREAD())) {
+        return _MD_SELECT(width, rd, wr, ex, tv);	
+    }
+#endif
+
+    if (width < 0 || width > FD_SETSIZE) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    /* Compute timeout */
+    if (tv) {
+        /*
+         * These acceptable ranges for t_sec and t_usec are taken
+         * from the select() man pages.
+         */
+        if (tv->tv_sec < 0 || tv->tv_sec > 100000000
+                || tv->tv_usec < 0 || tv->tv_usec >= 1000000) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        /* Convert microseconds to ticks */
+        timeout = PR_MicrosecondsToInterval(1000000*tv->tv_sec + tv->tv_usec);
+    } else {
+        /* tv being a NULL pointer means blocking indefinitely */
+        timeout = PR_INTERVAL_NO_TIMEOUT;
+    }
+
+    /* Check for no descriptors case (just doing a timeout) */
+    if ((!rd && !wr && !ex) || !width) {
+        PR_Sleep(timeout);
+        return 0;
+    }
+
+    /*
+     * Set up for PR_Poll().  The PRPollDesc array is allocated
+     * dynamically.  If this turns out to have high performance
+     * penalty, one can change to use a large PRPollDesc array
+     * on the stack, and allocate dynamically only when it turns
+     * out to be not large enough.
+     *
+     * I allocate an array of size 'width', which is the maximum
+     * number of fds we may need to poll.
+     */
+    unixpds = (_PRUnixPollDesc *) PR_CALLOC(width * sizeof(_PRUnixPollDesc));
+    if (!unixpds) {
+        errno = ENOMEM;
+        return -1;
+    }
+
+    pdcnt = 0;
+    unixpd = unixpds;
+    for (osfd = 0; osfd < width; osfd++) {
+        int in_flags = 0;
+        if (rd && FD_ISSET(osfd, rd)) {
+            in_flags |= _PR_UNIX_POLL_READ;
+        }
+        if (wr && FD_ISSET(osfd, wr)) {
+            in_flags |= _PR_UNIX_POLL_WRITE;
+        }
+        if (ex && FD_ISSET(osfd, ex)) {
+            in_flags |= _PR_UNIX_POLL_EXCEPT;
+        }
+        if (in_flags) {
+            unixpd->osfd = osfd;
+            unixpd->in_flags = in_flags;
+            unixpd->out_flags = 0;
+            unixpd++;
+            pdcnt++;
+        }
+    }
+
+    /*
+     * see comments in mozilla/cmd/xfe/mozilla.c (look for
+     * "PR_XGetXtHackFD")
+     */
+   {
+     int needToLockXAgain;
+ 
+     needToLockXAgain = 0;
+     if (rd && (_pr_xt_hack_fd != -1)
+             && FD_ISSET(_pr_xt_hack_fd, rd) && PR_XIsLocked()
+             && (!_pr_xt_hack_okayToReleaseXLock
+             || _pr_xt_hack_okayToReleaseXLock())) {
+         PR_XUnlock();
+         needToLockXAgain = 1;
+     }
+
+    /* This is the potentially blocking step */
+    retVal = _PR_WaitForMultipleFDs(unixpds, pdcnt, timeout);
+
+     if (needToLockXAgain) {
+         PR_XLock();
+     }
+   }
+
+    if (retVal > 0) {
+        /* Compute select results */
+        if (rd) ZAP_SET(rd, width);
+        if (wr) ZAP_SET(wr, width);
+        if (ex) ZAP_SET(ex, width);
+
+        /*
+         * The return value can be either the number of ready file
+         * descriptors or the number of set bits in the three fd_set's.
+         */
+        retVal = 0;  /* we're going to recompute */
+        eunixpd = unixpds + pdcnt;
+        for (unixpd = unixpds; unixpd < eunixpd; unixpd++) {
+            if (unixpd->out_flags) {
+                int nbits = 0;  /* The number of set bits on for this fd */
+
+                if (unixpd->out_flags & _PR_UNIX_POLL_NVAL) {
+                    errno = EBADF;
+                    PR_LOG(_pr_io_lm, PR_LOG_ERROR,
+                            ("select returns EBADF for %d", unixpd->osfd));
+                    retVal = -1;
+                    break;
+                }
+                /*
+                 * If a socket has a pending error, it is considered
+                 * both readable and writable.  (See W. Richard Stevens,
+                 * Unix Network Programming, Vol. 1, 2nd Ed., Section 6.3,
+                 * pp. 153-154.)  We also consider a socket readable if
+                 * it has a hangup condition.
+                 */
+                if (rd && (unixpd->in_flags & _PR_UNIX_POLL_READ)
+                        && (unixpd->out_flags & (_PR_UNIX_POLL_READ
+                        | _PR_UNIX_POLL_ERR | _PR_UNIX_POLL_HUP))) {
+                    FD_SET(unixpd->osfd, rd);
+                    nbits++;
+                }
+                if (wr && (unixpd->in_flags & _PR_UNIX_POLL_WRITE)
+                        && (unixpd->out_flags & (_PR_UNIX_POLL_WRITE
+                        | _PR_UNIX_POLL_ERR))) {
+                    FD_SET(unixpd->osfd, wr);
+                    nbits++;
+                }
+                if (ex && (unixpd->in_flags & _PR_UNIX_POLL_WRITE)
+                        && (unixpd->out_flags & PR_POLL_EXCEPT)) {
+                    FD_SET(unixpd->osfd, ex);
+                    nbits++;
+                }
+                PR_ASSERT(nbits > 0);
+#if defined(HPUX) || defined(SOLARIS) || defined(OSF1) || defined(AIX)
+                retVal += nbits;
+#else /* IRIX */
+                retVal += 1;
+#endif
+            }
+        }
+    }
+
+    PR_ASSERT(tv || retVal != 0);
+    PR_LOG(_pr_io_lm, PR_LOG_MIN, ("select returns %d", retVal));
+    PR_DELETE(unixpds);
+
+    return retVal;
+}
+
+/*
+ * Redefine poll, when supported on platforms, for local threads
+ */
+
+/*
+ * I am commenting out the poll() wrapper for Linux for now
+ * because it is difficult to define _MD_POLL that works on all
+ * Linux varieties.  People reported that glibc 2.0.7 on Debian
+ * 2.0 Linux machines doesn't have the __syscall_poll symbol
+ * defined.  (WTC 30 Nov. 1998)
+ */
+#if defined(_PR_POLL_AVAILABLE) && !defined(LINUX)
+
+/*
+ *-----------------------------------------------------------------------
+ * poll() --
+ *
+ * RETURN VALUES: 
+ *     -1:  fails, errno indicates the error.
+ *      0:  timed out, the revents bitmasks are not set.
+ *      positive value: the number of file descriptors for which poll()
+ *          has set the revents bitmask.
+ *
+ *-----------------------------------------------------------------------
+ */
+
+#include <poll.h>
+
+#if defined(AIX_RENAME_SELECT)
+int wrap_poll(void *listptr, unsigned long nfds, long timeout)
+#elif (defined(AIX) && !defined(AIX_RENAME_SELECT))
+int poll(void *listptr, unsigned long nfds, long timeout)
+#elif defined(OSF1) || (defined(HPUX) && !defined(HPUX9))
+int poll(struct pollfd filedes[], unsigned int nfds, int timeout)
+#elif defined(HPUX9)
+int poll(struct pollfd filedes[], int nfds, int timeout)
+#elif defined(NETBSD)
+int poll(struct pollfd *filedes, nfds_t nfds, int timeout)
+#elif defined(OPENBSD)
+int poll(struct pollfd filedes[], nfds_t nfds, int timeout)
+#elif defined(FREEBSD)
+int poll(struct pollfd *filedes, unsigned nfds, int timeout)
+#else
+int poll(struct pollfd *filedes, unsigned long nfds, int timeout)
+#endif
+{
+#ifdef AIX
+    struct pollfd *filedes = (struct pollfd *) listptr;
+#endif
+    struct pollfd *pfd, *epfd;
+    _PRUnixPollDesc *unixpds, *unixpd, *eunixpd;
+    PRIntervalTime ticks;
+    PRInt32 pdcnt;
+    int ready;
+
+    /*
+     * Easy special case: zero timeout.  Simply call the native
+     * poll() with no fear of blocking.
+     */
+    if (timeout == 0) {
+#if defined(AIX)
+        return _MD_POLL(listptr, nfds, timeout);
+#else
+        return _MD_POLL(filedes, nfds, timeout);
+#endif
+    }
+
+    if (!_pr_initialized) {
+        _PR_ImplicitInitialization();
+    }
+
+#ifndef _PR_LOCAL_THREADS_ONLY
+    if (_PR_IS_NATIVE_THREAD(_PR_MD_CURRENT_THREAD())) {
+    	return _MD_POLL(filedes, nfds, timeout);
+    }
+#endif
+
+    /* We do not support the pollmsg structures on AIX */
+#ifdef AIX
+    PR_ASSERT((nfds & 0xff00) == 0);
+#endif
+
+    if (timeout < 0 && timeout != -1) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    /* Convert timeout from miliseconds to ticks */
+    if (timeout == -1) {
+        ticks = PR_INTERVAL_NO_TIMEOUT;
+    } else {
+        ticks = PR_MillisecondsToInterval(timeout);
+    }
+
+    /* Check for no descriptor case (just do a timeout) */
+    if (nfds == 0) {
+        PR_Sleep(ticks);
+        return 0;
+    }
+
+    unixpds = (_PRUnixPollDesc *)
+            PR_MALLOC(nfds * sizeof(_PRUnixPollDesc));
+    if (NULL == unixpds) {
+        errno = EAGAIN;
+        return -1;
+    }
+
+    pdcnt = 0;
+    epfd = filedes + nfds;
+    unixpd = unixpds;
+    for (pfd = filedes; pfd < epfd; pfd++) {
+        /*
+         * poll() ignores negative fd's.
+         */
+        if (pfd->fd >= 0) {
+            unixpd->osfd = pfd->fd;
+#ifdef _PR_USE_POLL
+            unixpd->in_flags = pfd->events;
+#else
+            /*
+             * Map the poll events to one of the three that can be
+             * represented by the select fd_sets:
+             *     POLLIN, POLLRDNORM  ===> readable
+             *     POLLOUT, POLLWRNORM ===> writable
+             *     POLLPRI, POLLRDBAND ===> exception
+             *     POLLNORM, POLLWRBAND (and POLLMSG on some platforms)
+             *     are ignored.
+             *
+             * The output events POLLERR and POLLHUP are never turned on.
+             * POLLNVAL may be turned on.
+             */
+            unixpd->in_flags = 0;
+            if (pfd->events & (POLLIN
+#ifdef POLLRDNORM
+                    | POLLRDNORM
+#endif
+                    )) {
+                unixpd->in_flags |= _PR_UNIX_POLL_READ;
+            }
+            if (pfd->events & (POLLOUT
+#ifdef POLLWRNORM
+                    | POLLWRNORM
+#endif
+                    )) {
+                unixpd->in_flags |= _PR_UNIX_POLL_WRITE;
+            }
+            if (pfd->events & (POLLPRI
+#ifdef POLLRDBAND
+                    | POLLRDBAND
+#endif
+                    )) {
+                unixpd->in_flags |= PR_POLL_EXCEPT;
+            }
+#endif  /* _PR_USE_POLL */
+            unixpd->out_flags = 0;
+            unixpd++;
+            pdcnt++;
+        }
+    }
+
+    ready = _PR_WaitForMultipleFDs(unixpds, pdcnt, ticks);
+    if (-1 == ready) {
+        if (PR_GetError() == PR_PENDING_INTERRUPT_ERROR) {
+            errno = EINTR;  /* XXX we aren't interrupted by a signal, but... */
+        } else {
+            errno = PR_GetOSError();
+        }
+    }
+    if (ready <= 0) {
+        goto done;
+    }
+
+    /*
+     * Copy the out_flags from the _PRUnixPollDesc structures to the
+     * user's pollfd structures and free the allocated memory
+     */
+    unixpd = unixpds;
+    for (pfd = filedes; pfd < epfd; pfd++) {
+        pfd->revents = 0;
+        if (pfd->fd >= 0) {
+#ifdef _PR_USE_POLL
+            pfd->revents = unixpd->out_flags;
+#else
+            if (0 != unixpd->out_flags) {
+                if (unixpd->out_flags & _PR_UNIX_POLL_READ) {
+                    if (pfd->events & POLLIN) {
+                        pfd->revents |= POLLIN;
+                    }
+#ifdef POLLRDNORM
+                    if (pfd->events & POLLRDNORM) {
+                        pfd->revents |= POLLRDNORM;
+                    }
+#endif
+                }
+                if (unixpd->out_flags & _PR_UNIX_POLL_WRITE) {
+                    if (pfd->events & POLLOUT) {
+                        pfd->revents |= POLLOUT;
+                    }
+#ifdef POLLWRNORM
+                    if (pfd->events & POLLWRNORM) {
+                        pfd->revents |= POLLWRNORM;
+                    }
+#endif
+                }
+                if (unixpd->out_flags & _PR_UNIX_POLL_EXCEPT) {
+                    if (pfd->events & POLLPRI) {
+                        pfd->revents |= POLLPRI;
+                    }
+#ifdef POLLRDBAND
+                    if (pfd->events & POLLRDBAND) {
+                        pfd->revents |= POLLRDBAND;
+                    }
+#endif
+                }
+                if (unixpd->out_flags & _PR_UNIX_POLL_ERR) {
+                    pfd->revents |= POLLERR;
+                }
+                if (unixpd->out_flags & _PR_UNIX_POLL_NVAL) {
+                    pfd->revents |= POLLNVAL;
+                }
+                if (unixpd->out_flags & _PR_UNIX_POLL_HUP) {
+                    pfd->revents |= POLLHUP;
+                }
+            }
+#endif  /* _PR_USE_POLL */
+            unixpd++;
+        }
+    }
+
+done:
+    PR_DELETE(unixpds);
+    return ready;
+}
+
+#endif  /* !defined(LINUX) */
+
+#endif  /* defined(_PR_PTHREADS) || defined(_PR_GLOBAL_THREADS_ONLY) */
+
+/* uxwrap.c */
+
diff --git a/nsprpub/pr/src/md/windows/Makefile.in b/nsprpub/pr/src/md/windows/Makefile.in
new file mode 100644
index 000000000..04bd716d9
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/Makefile.in
@@ -0,0 +1,72 @@
+# 
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#! gmake
+
+MOD_DEPTH	= ../../../..
+topsrcdir	= @top_srcdir@
+srcdir		= @srcdir@
+VPATH		= @srcdir@
+
+include $(MOD_DEPTH)/config/autoconf.mk
+
+include $(topsrcdir)/config/config.mk
+
+ifeq (,$(filter-out WIN95 WINCE WINMO, $(OS_TARGET)))
+CSRCS =          \
+    ntmisc.c \
+    ntsec.c   \
+    ntsem.c   \
+    ntinrval.c \
+    ntgc.c \
+	w95thred.c \
+	w95io.c \
+	w95cv.c \
+	w32rng.c \
+	w95sock.c \
+	win32_errors.c \
+    w32ipcsem.c \
+    w32poll.c \
+    w32shm.c \
+    w95dllmain.c \
+    $(NULL)
+else
+CSRCS =          \
+    ntdllmn.c \
+    ntmisc.c \
+    ntsec.c   \
+    ntsem.c   \
+    ntinrval.c \
+    ntgc.c \
+    ntthread.c \
+    ntio.c    \
+	win32_errors.c \
+    w32ipcsem.c \
+    w32poll.c \
+    w32rng.c \
+    w32shm.c \
+    $(NULL)
+endif
+
+TARGETS	= $(OBJS)
+
+INCLUDES = -I$(dist_includedir) -I$(topsrcdir)/pr/include -I$(topsrcdir)/pr/include/private
+
+DEFINES += -D_NSPR_BUILD_
+
+include $(topsrcdir)/config/rules.mk
+
+export:: $(TARGETS)
+
+# Bug 122433 workaround: disable global optimization (-Og-) on ntio.c.
+ifdef MOZ_OPTIMIZE
+ifeq ($(OS_TARGET), WINNT)
+ifndef NS_USE_GCC
+$(OBJDIR)/ntio.$(OBJ_SUFFIX): ntio.c
+	@$(MAKE_OBJDIR)
+	$(CC) -Fo$@ -c $(CFLAGS) -Og- $<
+endif
+endif
+endif
diff --git a/nsprpub/pr/src/md/windows/ntdllmn.c b/nsprpub/pr/src/md/windows/ntdllmn.c
new file mode 100644
index 000000000..7dec0517d
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/ntdllmn.c
@@ -0,0 +1,56 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * The DLL entry point (DllMain) for NSPR.
+ *
+ * The only reason we use DLLMain() now is to find out whether
+ * the NSPR DLL is statically or dynamically loaded.  When
+ * dynamically loaded, we cannot use static thread-local storage.
+ * However, static TLS is faster than the TlsXXX() functions.
+ * So we want to use static TLS whenever we can.  A global
+ * variable _pr_use_static_tls is set in DllMain() during process
+ * attachment to indicate whether it is safe to use static TLS
+ * or not.
+ */
+
+#include <windows.h>
+#include <primpl.h>
+
+extern BOOL _pr_use_static_tls;  /* defined in ntthread.c */
+
+BOOL WINAPI DllMain(
+    HINSTANCE hinstDLL,
+    DWORD fdwReason,
+    LPVOID lpvReserved)
+{
+PRThread *me;
+
+    switch (fdwReason) {
+        case DLL_PROCESS_ATTACH:
+            /*
+             * If lpvReserved is NULL, we are dynamically loaded
+             * and therefore can't use static thread-local storage.
+             */
+            if (lpvReserved == NULL) {
+                _pr_use_static_tls = FALSE;
+            } else {
+                _pr_use_static_tls = TRUE;
+            }
+            break;
+        case DLL_THREAD_ATTACH:
+            break;
+        case DLL_THREAD_DETACH:
+            if (_pr_initialized) {
+                me = _MD_GET_ATTACHED_THREAD();
+                if ((me != NULL) && (me->flags & _PR_ATTACHED))
+                    _PRI_DetachThread();
+            }
+            break;
+        case DLL_PROCESS_DETACH:
+            break;
+    }
+    return TRUE;
+}
diff --git a/nsprpub/pr/src/md/windows/ntgc.c b/nsprpub/pr/src/md/windows/ntgc.c
new file mode 100644
index 000000000..55ac92fb0
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/ntgc.c
@@ -0,0 +1,98 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * GC related routines
+ *
+ */
+#include <windows.h>
+#include "primpl.h"
+
+PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np) 
+{
+#if defined(_X86_)
+    CONTEXT context;
+    context.ContextFlags = CONTEXT_INTEGER;
+
+    if (_PR_IS_NATIVE_THREAD(t)) {
+        context.ContextFlags |= CONTEXT_CONTROL;
+        if (GetThreadContext(t->md.handle, &context)) {
+            t->md.gcContext[0] = context.Eax;
+            t->md.gcContext[1] = context.Ebx;
+            t->md.gcContext[2] = context.Ecx;
+            t->md.gcContext[3] = context.Edx;
+            t->md.gcContext[4] = context.Esi;
+            t->md.gcContext[5] = context.Edi;
+            t->md.gcContext[6] = context.Esp;
+            t->md.gcContext[7] = context.Ebp;
+            *np = PR_NUM_GCREGS;
+        } else {
+            PR_ASSERT(0);/* XXX */
+        }
+    } else {
+        /* WARNING WARNING WARNING WARNING WARNING WARNING WARNING
+         *
+         * This code is extremely machine dependant and completely 
+         * undocumented by MS.  Its only known to work experimentally.  
+         * Ready for a walk on the wild * side?
+         *
+         * WARNING WARNING WARNING WARNING WARNING WARNING WARNING */
+
+#if !defined WIN95 // Win95 does not have fibers
+        int *fiberData = t->md.fiber_id;
+
+        /* I found these offsets by disassembling SwitchToFiber().
+         * Are your palms sweating yet?
+         */
+
+        /* 
+        ** EAX is on the stack (ESP+0)
+        ** EDX is on the stack (ESP+4)
+        ** ECX is on the stack (ESP+8)
+        */
+        t->md.gcContext[0] = 0;                /* context.Eax */
+        t->md.gcContext[1] = fiberData[0x2e];  /* context.Ebx */
+        t->md.gcContext[2] = 0;                /* context.Ecx */
+        t->md.gcContext[3] = 0;                /* context.Edx */
+        t->md.gcContext[4] = fiberData[0x2d];  /* context.Esi */
+        t->md.gcContext[5] = fiberData[0x2c];  /* context.Edi */
+        t->md.gcContext[6] = fiberData[0x36];  /* context.Esp */
+        t->md.gcContext[7] = fiberData[0x32];  /* context.Ebp */
+        *np = PR_NUM_GCREGS;
+#endif
+    }
+    return (PRWord *)&t->md.gcContext;
+#else
+    PR_NOT_REACHED("not implemented");
+    return NULL;
+#endif /* defined(_X86_) */
+}
+
+/* This function is not used right now, but is left as a reference.
+ * If you ever need to get the fiberID from the currently running fiber, 
+ * this is it.
+ */
+void *
+GetMyFiberID()
+{
+#if defined(_X86_) && !defined(__MINGW32__)
+    void *fiberData;
+
+    /* A pointer to our tib entry is found at FS:[18]
+     * At offset 10h is the fiberData pointer.  The context of the 
+     * fiber is stored in there.  
+     */
+    __asm {
+        mov    EDX, FS:[18h]
+        mov    EAX, DWORD PTR [EDX+10h]
+        mov    [fiberData], EAX
+    }
+  
+    return fiberData;
+#else
+    PR_NOT_REACHED("not implemented");
+    return NULL;
+#endif /* defined(_X86_) */
+}
diff --git a/nsprpub/pr/src/md/windows/ntinrval.c b/nsprpub/pr/src/md/windows/ntinrval.c
new file mode 100644
index 000000000..10aca11ba
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/ntinrval.c
@@ -0,0 +1,51 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * NT interval timers
+ *
+ */
+
+/* Mozilla's build system defines this globally. */
+#ifdef WIN32_LEAN_AND_MEAN
+#undef WIN32_LEAN_AND_MEAN
+#endif
+#include "primpl.h"
+
+#ifdef WINCE
+typedef DWORD (*IntervalFuncType)(void);
+static IntervalFuncType intervalFunc;
+#endif
+
+void
+_PR_MD_INTERVAL_INIT()
+{
+#ifdef WINCE
+    HMODULE mmtimerlib = LoadLibraryW(L"mmtimer.dll");  /* XXX leaked! */
+    if (mmtimerlib) {
+        intervalFunc = (IntervalFuncType)GetProcAddress(mmtimerlib,
+                                                        "timeGetTime");
+    } else {
+        intervalFunc = &GetTickCount;
+    }
+#endif
+}
+
+PRIntervalTime 
+_PR_MD_GET_INTERVAL()
+{
+    /* milliseconds since system start */
+#ifdef WINCE
+    return (*intervalFunc)();
+#else
+    return timeGetTime();
+#endif
+}
+
+PRIntervalTime 
+_PR_MD_INTERVAL_PER_SEC()
+{
+    return 1000;
+}
diff --git a/nsprpub/pr/src/md/windows/ntio.c b/nsprpub/pr/src/md/windows/ntio.c
new file mode 100644
index 000000000..aba53dc85
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/ntio.c
@@ -0,0 +1,4609 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Windows NT IO module
+ *
+ * This module handles IO for LOCAL_SCOPE and GLOBAL_SCOPE threads.
+ * For LOCAL_SCOPE threads, we're using NT fibers.  For GLOBAL_SCOPE threads
+ * we're using NT-native threads.
+ *
+ * When doing IO, we want to use completion ports for optimal performance 
+ * with fibers.  But if we use completion ports for all IO, it is difficult
+ * to project a blocking model with GLOBAL_SCOPE threads.  To handle this
+ * we create an extra thread for completing IO for GLOBAL_SCOPE threads.
+ * We don't really want to complete IO on a separate thread for LOCAL_SCOPE
+ * threads because it means extra context switches, which are really slow
+ * on NT...  Since we're using a single completion port, some IO will
+ * be incorrectly completed on the GLOBAL_SCOPE IO thread; this will mean
+ * extra context switching; but I don't think there is anything I can do
+ * about it.
+ */
+
+#include "primpl.h"
+#include "pprmwait.h"
+#include <direct.h>
+#include <mbstring.h>
+
+static HANDLE                _pr_completion_port;
+static PRThread             *_pr_io_completion_thread;
+
+#define RECYCLE_SIZE 512
+static struct _MDLock        _pr_recycle_lock;
+static PRInt32               _pr_recycle_INET_array[RECYCLE_SIZE];
+static PRInt32               _pr_recycle_INET_tail = 0; 
+static PRInt32               _pr_recycle_INET6_array[RECYCLE_SIZE];
+static PRInt32               _pr_recycle_INET6_tail = 0; 
+
+__declspec(thread) PRThread *_pr_io_restarted_io = NULL;
+DWORD _pr_io_restartedIOIndex;  /* The thread local storage slot for each
+                                 * thread is initialized to NULL. */
+
+PRBool                       _nt_version_gets_lockfile_completion;
+
+struct _MDLock               _pr_ioq_lock;
+extern _MDLock               _nt_idleLock;
+extern PRCList               _nt_idleList;
+extern PRUint32              _nt_idleCount;
+
+#define CLOSE_TIMEOUT   PR_SecondsToInterval(5)
+
+/*
+ * NSPR-to-NT access right mapping table for files.
+ */
+static DWORD fileAccessTable[] = {
+    FILE_GENERIC_READ,
+    FILE_GENERIC_WRITE,
+    FILE_GENERIC_EXECUTE
+};
+
+/*
+ * NSPR-to-NT access right mapping table for directories.
+ */
+static DWORD dirAccessTable[] = {
+    FILE_GENERIC_READ,
+    FILE_GENERIC_WRITE|FILE_DELETE_CHILD,
+    FILE_GENERIC_EXECUTE
+};
+
+static PRBool IsPrevCharSlash(const char *str, const char *current);
+
+#define _NEED_351_FILE_LOCKING_HACK
+#ifdef _NEED_351_FILE_LOCKING_HACK
+#define _PR_LOCAL_FILE 1
+#define _PR_REMOTE_FILE 2
+PRBool IsFileLocalInit();
+PRInt32 IsFileLocal(HANDLE hFile);
+#endif /* _NEED_351_FILE_LOCKING_HACK */
+
+static PRInt32 _md_MakeNonblock(HANDLE);
+
+static PROsfd _nt_nonblock_accept(PRFileDesc *fd, struct sockaddr *addr, int *addrlen, PRIntervalTime);
+static PRInt32 _nt_nonblock_connect(PRFileDesc *fd, struct sockaddr *addr, int addrlen, PRIntervalTime);
+static PRInt32 _nt_nonblock_recv(PRFileDesc *fd, char *buf, int len, int flags, PRIntervalTime);
+static PRInt32 _nt_nonblock_send(PRFileDesc *fd, char *buf, int len, PRIntervalTime);
+static PRInt32 _nt_nonblock_writev(PRFileDesc *fd, const PRIOVec *iov, int size, PRIntervalTime);
+static PRInt32 _nt_nonblock_sendto(PRFileDesc *, const char *, int, const struct sockaddr *, int, PRIntervalTime);
+static PRInt32 _nt_nonblock_recvfrom(PRFileDesc *, char *, int, struct sockaddr *, int *, PRIntervalTime);
+
+/*
+ * We cannot associate a fd (a socket) with an I/O completion port
+ * if the fd is nonblocking or inheritable.
+ *
+ * Nonblocking socket I/O won't work if the socket is associated with
+ * an I/O completion port.
+ *
+ * An inheritable fd cannot be associated with an I/O completion port
+ * because the completion notification of async I/O initiated by the
+ * child process is still posted to the I/O completion port in the
+ * parent process. 
+ */
+#define _NT_USE_NB_IO(fd) \
+    ((fd)->secret->nonblocking || (fd)->secret->inheritable == _PR_TRI_TRUE)
+
+/*
+ * UDP support
+ * 
+ * UDP is supported on NT by the continuation thread mechanism.
+ * The code is borrowed from ptio.c in pthreads nspr, hence the
+ * PT and pt prefixes.  This mechanism is in fact general and
+ * not limited to UDP.  For now, only UDP's recvfrom and sendto
+ * go through the continuation thread if they get WSAEWOULDBLOCK
+ * on first try.  Recv and send on a connected UDP socket still
+ * goes through asychronous io.
+ */
+
+#define PT_DEFAULT_SELECT_MSEC 100
+
+typedef struct pt_Continuation pt_Continuation;
+typedef PRBool (*ContinuationFn)(pt_Continuation *op, PRInt16 revent);
+
+typedef enum pr_ContuationStatus
+{
+    pt_continuation_sumbitted,
+    pt_continuation_inprogress,
+    pt_continuation_abort,
+    pt_continuation_done
+} pr_ContuationStatus;
+
+struct pt_Continuation
+{
+    /* These objects are linked in ascending timeout order */
+    pt_Continuation *next, *prev;           /* self linked list of these things */
+
+    /* The building of the continuation operation */
+    ContinuationFn function;                /* what function to continue */
+    union { SOCKET osfd; } arg1;            /* #1 - the op's fd */
+    union { void* buffer; } arg2;           /* #2 - primary transfer buffer */
+    union { PRIntn amount; } arg3;          /* #3 - size of 'buffer' */
+    union { PRIntn flags; } arg4;           /* #4 - read/write flags */
+    union { PRNetAddr *addr; } arg5;        /* #5 - send/recv address */
+    
+    PRIntervalTime timeout;                 /* representation of the timeout */
+
+    PRIntn event;                           /* flags for select()'s events */
+
+    /*
+    ** The representation and notification of the results of the operation.
+    ** These function can either return an int return code or a pointer to
+    ** some object.
+    */
+    union { PRIntn code; void *object; } result;
+
+    PRIntn syserrno;                        /* in case it failed, why (errno) */
+    pr_ContuationStatus status;             /* the status of the operation */
+    PRCondVar *complete;                    /* to notify the initiating thread */
+};
+
+static struct pt_TimedQueue
+{
+    PRLock *ml;                             /* a little protection */
+    PRThread *thread;                       /* internal thread's identification */
+    PRCondVar *new_op;                      /* new operation supplied */
+    PRCondVar *finish_op;                   /* an existing operation finished */
+    PRUintn op_count;                       /* number of operations in the list */
+    pt_Continuation *head, *tail;           /* head/tail of list of operations */
+
+    pt_Continuation *op;                    /* timed operation furthest in future */
+    PRIntervalTime epoch;                   /* the epoch of 'timed' */
+} pt_tq;
+
+#if defined(DEBUG)
+static struct pt_debug_s
+{
+    PRIntn predictionsFoiled;
+    PRIntn pollingListMax;
+    PRIntn continuationsServed;
+} pt_debug;
+#endif  /* DEBUG */
+
+static void ContinuationThread(void *arg);
+static PRInt32 pt_SendTo(
+    SOCKET osfd, const void *buf,
+    PRInt32 amount, PRInt32 flags, const PRNetAddr *addr,
+    PRIntn addrlen, PRIntervalTime timeout);
+static PRInt32 pt_RecvFrom(SOCKET osfd, void *buf, PRInt32 amount,
+    PRInt32 flags, PRNetAddr *addr, PRIntn *addr_len, PRIntervalTime timeout);
+
+
+/* The key returned from GetQueuedCompletionStatus() is used to determine what
+ * type of completion we have.  We differentiate between IO completions and
+ * CVAR completions.
+ */
+#define KEY_IO              0xaaaaaaaa
+#define KEY_CVAR            0xbbbbbbbb
+
+PRInt32
+_PR_MD_PAUSE_CPU(PRIntervalTime ticks)
+{
+    int awoken = 0;
+    unsigned long bytes, key;
+    int rv;
+    LPOVERLAPPED olp;
+    _MDOverlapped *mdOlp;
+    PRUint32 timeout;
+
+    if (_nt_idleCount > 0) {
+        PRThread *deadThread;
+
+        _MD_LOCK(&_nt_idleLock);
+        while( !PR_CLIST_IS_EMPTY(&_nt_idleList) ) {
+            deadThread = _PR_THREAD_PTR(PR_LIST_HEAD(&_nt_idleList));
+            PR_REMOVE_LINK(&deadThread->links);
+
+            PR_ASSERT(deadThread->state == _PR_DEAD_STATE);
+
+            /* XXXMB - cleanup to do here? */
+            if ( !_PR_IS_NATIVE_THREAD(deadThread) ){
+                /* Spinlock while user thread is still running.
+                 * There is no way to use a condition variable here. The thread
+                 * is dead, and we have to wait until we switch off the dead 
+                 * thread before we can kill the fiber completely.
+                 */
+                while ( deadThread->no_sched)
+                    ;
+
+                DeleteFiber(deadThread->md.fiber_id);
+            }
+            memset(deadThread, 0xa, sizeof(PRThread)); /* debugging */
+            if (!deadThread->threadAllocatedOnStack)
+                PR_DELETE(deadThread);
+            _nt_idleCount--;
+        }
+        _MD_UNLOCK(&_nt_idleLock);
+    }
+
+    if (ticks == PR_INTERVAL_NO_TIMEOUT)
+#if 0
+        timeout = INFINITE;
+#else
+    /*
+     * temporary hack to poll the runq every 5 seconds because of bug in
+     * native threads creating user threads and not poking the right cpu.
+     *
+     * A local thread that was interrupted is bound to its current
+     * cpu but there is no easy way for the interrupter to poke the
+     * right cpu.  This is a hack to poll the runq every 5 seconds.
+     */
+        timeout = 5000;
+#endif
+    else 
+        timeout = PR_IntervalToMilliseconds(ticks);
+
+    /*
+     * The idea of looping here is to complete as many IOs as possible before
+     * returning.  This should minimize trips to the idle thread.
+     */
+    while(1) {
+        rv = GetQueuedCompletionStatus(
+                _pr_completion_port,
+                &bytes,
+                &key,
+                &olp,
+                timeout); 
+        if (rv == 0 && olp == NULL) {
+            /* Error in GetQueuedCompetionStatus */
+            if (GetLastError() != WAIT_TIMEOUT) {
+                /* ARGH - what can we do here? Log an error? XXXMB */
+                return -1;
+            } else {
+                /* If awoken == 0, then we just had a timeout */
+                return awoken;
+            }
+        }
+
+        if (olp == NULL) 
+            return 0;
+
+        mdOlp = (_MDOverlapped *)olp;
+
+        if (mdOlp->ioModel == _MD_MultiWaitIO) {
+            PRRecvWait *desc;
+            PRWaitGroup *group;
+            PRThread *thred = NULL;
+            PRMWStatus mwstatus;
+
+            desc = mdOlp->data.mw.desc;
+            PR_ASSERT(desc != NULL);
+            mwstatus = rv ? PR_MW_SUCCESS : PR_MW_FAILURE;
+            if (InterlockedCompareExchange((PVOID *)&desc->outcome,
+                    (PVOID)mwstatus, (PVOID)PR_MW_PENDING)
+                    == (PVOID)PR_MW_PENDING) {
+                if (mwstatus == PR_MW_SUCCESS) {
+                    desc->bytesRecv = bytes;
+                } else {
+                    mdOlp->data.mw.error = GetLastError();
+                }
+            }
+            group = mdOlp->data.mw.group;
+            PR_ASSERT(group != NULL);
+
+            _PR_MD_LOCK(&group->mdlock);
+            PR_APPEND_LINK(&mdOlp->data.mw.links, &group->io_ready);
+            PR_ASSERT(desc->fd != NULL);
+            NT_HashRemoveInternal(group, desc->fd);
+            if (!PR_CLIST_IS_EMPTY(&group->wait_list)) {
+                thred = _PR_THREAD_CONDQ_PTR(PR_LIST_HEAD(&group->wait_list));
+                PR_REMOVE_LINK(&thred->waitQLinks);
+            }
+            _PR_MD_UNLOCK(&group->mdlock);
+
+            if (thred) {
+                if (!_PR_IS_NATIVE_THREAD(thred)) {
+                    int pri = thred->priority;
+                    _PRCPU *lockedCPU = _PR_MD_CURRENT_CPU();
+                    _PR_THREAD_LOCK(thred);
+                    if (thred->flags & _PR_ON_PAUSEQ) {
+                        _PR_SLEEPQ_LOCK(thred->cpu);
+                        _PR_DEL_SLEEPQ(thred, PR_TRUE);
+                        _PR_SLEEPQ_UNLOCK(thred->cpu);
+                        _PR_THREAD_UNLOCK(thred);
+                        thred->cpu = lockedCPU;
+                        thred->state = _PR_RUNNABLE;
+                        _PR_RUNQ_LOCK(lockedCPU);
+                        _PR_ADD_RUNQ(thred, lockedCPU, pri);
+                        _PR_RUNQ_UNLOCK(lockedCPU);
+                    } else {
+                        /*
+                         * The thread was just interrupted and moved
+                         * from the pause queue to the run queue.
+                         */
+                        _PR_THREAD_UNLOCK(thred);
+                    }
+                } else {
+                    _PR_THREAD_LOCK(thred);
+                    thred->state = _PR_RUNNABLE;
+                    _PR_THREAD_UNLOCK(thred);
+                    ReleaseSemaphore(thred->md.blocked_sema, 1, NULL);
+                }
+            }
+        } else {
+            PRThread *completed_io;
+
+            PR_ASSERT(mdOlp->ioModel == _MD_BlockingIO);
+            completed_io = _PR_THREAD_MD_TO_PTR(mdOlp->data.mdThread);
+            completed_io->md.blocked_io_status = rv;
+            if (rv == 0)
+                completed_io->md.blocked_io_error = GetLastError();
+            completed_io->md.blocked_io_bytes = bytes;
+
+            if ( !_PR_IS_NATIVE_THREAD(completed_io) ) {
+                int pri = completed_io->priority;
+                _PRCPU *lockedCPU = _PR_MD_CURRENT_CPU();
+
+                /* The KEY_CVAR notification only occurs when a native thread
+                 * is notifying a user thread.  For user-user notifications
+                 * the wakeup occurs by having the notifier place the thread 
+                 * on the runq directly; for native-native notifications the
+                 * wakeup occurs by calling ReleaseSemaphore.
+                 */
+                if ( key == KEY_CVAR ) {
+                    PR_ASSERT(completed_io->io_pending == PR_FALSE);
+                    PR_ASSERT(completed_io->io_suspended == PR_FALSE);
+                    PR_ASSERT(completed_io->md.thr_bound_cpu == NULL);
+
+                    /* Thread has already been deleted from sleepQ */
+
+                    /* Switch CPU and add to runQ */
+                    completed_io->cpu = lockedCPU;
+                    completed_io->state = _PR_RUNNABLE;
+                    _PR_RUNQ_LOCK(lockedCPU);
+                    _PR_ADD_RUNQ(completed_io, lockedCPU, pri);
+                    _PR_RUNQ_UNLOCK(lockedCPU);
+                } else {
+                    PR_ASSERT(key == KEY_IO);
+                    PR_ASSERT(completed_io->io_pending == PR_TRUE);
+
+                    _PR_THREAD_LOCK(completed_io);
+
+                    completed_io->io_pending = PR_FALSE;
+
+                    /* If io_suspended is true, then this IO has already resumed.
+                     * We don't need to do anything; because the thread is
+                     * already running.
+                     */
+                    if (completed_io->io_suspended == PR_FALSE) {
+                        if (completed_io->flags & (_PR_ON_SLEEPQ|_PR_ON_PAUSEQ)) {
+                            _PR_SLEEPQ_LOCK(completed_io->cpu);
+                            _PR_DEL_SLEEPQ(completed_io, PR_TRUE);
+                            _PR_SLEEPQ_UNLOCK(completed_io->cpu);
+
+                            _PR_THREAD_UNLOCK(completed_io);
+
+						/*
+						 * If an I/O operation is suspended, the thread
+						 * must be running on the same cpu on which the
+						 * I/O operation was issued.
+						 */
+						PR_ASSERT(!completed_io->md.thr_bound_cpu ||
+					(completed_io->cpu == completed_io->md.thr_bound_cpu));
+
+							if (!completed_io->md.thr_bound_cpu)
+                            	completed_io->cpu = lockedCPU;
+                            completed_io->state = _PR_RUNNABLE;
+                            _PR_RUNQ_LOCK(completed_io->cpu);
+                            _PR_ADD_RUNQ(completed_io, completed_io->cpu, pri);
+                            _PR_RUNQ_UNLOCK(completed_io->cpu);
+                        } else {
+                            _PR_THREAD_UNLOCK(completed_io);
+                        }
+                    } else {
+                        _PR_THREAD_UNLOCK(completed_io);
+                    }
+                }
+            } else {
+                /* For native threads, they are only notified through this loop
+                 * when completing IO.  So, don't worry about this being a CVAR
+                 * notification, because that is not possible.
+                 */
+                _PR_THREAD_LOCK(completed_io);
+                completed_io->io_pending = PR_FALSE;
+                if (completed_io->io_suspended == PR_FALSE) {
+                    completed_io->state = _PR_RUNNABLE;
+                    _PR_THREAD_UNLOCK(completed_io);
+                    rv = ReleaseSemaphore(completed_io->md.blocked_sema,
+                            1, NULL);
+                    PR_ASSERT(0 != rv);
+                } else {
+                    _PR_THREAD_UNLOCK(completed_io);
+                }
+            }
+        }
+
+        awoken++;
+        timeout = 0;   /* Don't block on subsequent trips through the loop */
+    }
+
+    /* never reached */
+    return 0;
+}
+
+static PRStatus
+_native_thread_md_wait(PRThread *thread, PRIntervalTime ticks)
+{
+    DWORD rv;
+	PRUint32 msecs = (ticks == PR_INTERVAL_NO_TIMEOUT) ?
+		INFINITE : PR_IntervalToMilliseconds(ticks);
+
+	/*
+	 * thread waiting for a cvar or a joining thread
+	 */
+	rv = WaitForSingleObject(thread->md.blocked_sema, msecs);
+	switch(rv) {
+		case WAIT_OBJECT_0:
+			return PR_SUCCESS;
+			break;
+		case WAIT_TIMEOUT:
+			_PR_THREAD_LOCK(thread);
+			PR_ASSERT (thread->state != _PR_IO_WAIT);
+			if (thread->wait.cvar != NULL) {
+				PR_ASSERT(thread->state == _PR_COND_WAIT);
+				thread->wait.cvar = NULL;
+				thread->state = _PR_RUNNING;
+				_PR_THREAD_UNLOCK(thread);
+			} else {
+				/* The CVAR was notified just as the timeout
+				 * occurred.  This left the semaphore in the
+				 * signaled state.  Call WaitForSingleObject()
+				 * to clear the semaphore.
+				 */
+				_PR_THREAD_UNLOCK(thread);
+				rv = WaitForSingleObject(thread->md.blocked_sema, INFINITE);
+				PR_ASSERT(rv == WAIT_OBJECT_0);
+			}
+			return PR_SUCCESS;
+			break;
+		default:
+			return PR_FAILURE;
+			break;
+	}
+
+    return PR_SUCCESS;
+}
+
+PRStatus
+_PR_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    DWORD rv;
+
+	if (_native_threads_only) {
+		return(_native_thread_md_wait(thread, ticks));
+	}
+    if ( thread->flags & _PR_GLOBAL_SCOPE ) {
+        PRUint32 msecs = (ticks == PR_INTERVAL_NO_TIMEOUT) ?
+            INFINITE : PR_IntervalToMilliseconds(ticks);
+        rv = WaitForSingleObject(thread->md.blocked_sema, msecs);
+        switch(rv) {
+            case WAIT_OBJECT_0:
+                return PR_SUCCESS;
+                break;
+            case WAIT_TIMEOUT:
+                _PR_THREAD_LOCK(thread);
+                if (thread->state == _PR_IO_WAIT) {
+                    if (thread->io_pending == PR_TRUE) {
+                        thread->state = _PR_RUNNING;
+                        thread->io_suspended = PR_TRUE;
+                        _PR_THREAD_UNLOCK(thread);
+                    } else {
+                        /* The IO completed just at the same time the timeout
+                         * occurred.  This left the semaphore in the signaled
+                         * state.  Call WaitForSingleObject() to clear the
+                         * semaphore.
+                         */
+                        _PR_THREAD_UNLOCK(thread);
+                        rv = WaitForSingleObject(thread->md.blocked_sema, INFINITE);
+                        PR_ASSERT(rv == WAIT_OBJECT_0);
+                    }
+                } else {
+                    if (thread->wait.cvar != NULL) {
+                        PR_ASSERT(thread->state == _PR_COND_WAIT);
+                        thread->wait.cvar = NULL;
+                        thread->state = _PR_RUNNING;
+                        _PR_THREAD_UNLOCK(thread);
+                    } else {
+                        /* The CVAR was notified just as the timeout
+                         * occurred.  This left the semaphore in the
+                         * signaled state.  Call WaitForSingleObject()
+                         * to clear the semaphore.
+                         */
+                        _PR_THREAD_UNLOCK(thread);
+                        rv = WaitForSingleObject(thread->md.blocked_sema, INFINITE);
+                        PR_ASSERT(rv == WAIT_OBJECT_0);
+                    }
+                }
+                return PR_SUCCESS;
+                break;
+            default:
+                return PR_FAILURE;
+                break;
+        }
+    } else {
+        PRInt32 is;
+
+        _PR_INTSOFF(is);
+        _PR_MD_SWITCH_CONTEXT(thread);
+    }
+
+    return PR_SUCCESS;
+}
+
+static void
+_native_thread_io_nowait(
+    PRThread *thread,
+    int rv,
+    int bytes)
+{
+    int rc;
+
+    PR_ASSERT(rv != 0);
+    _PR_THREAD_LOCK(thread);
+    if (thread->state == _PR_IO_WAIT) {
+        PR_ASSERT(thread->io_suspended == PR_FALSE);
+        PR_ASSERT(thread->io_pending == PR_TRUE);
+        thread->state = _PR_RUNNING;
+        thread->io_pending = PR_FALSE;
+        _PR_THREAD_UNLOCK(thread);
+    } else {
+        /* The IO completed just at the same time the
+         * thread was interrupted. This left the semaphore
+         * in the signaled state. Call WaitForSingleObject()
+         * to clear the semaphore.
+         */
+        PR_ASSERT(thread->io_suspended == PR_TRUE);
+        PR_ASSERT(thread->io_pending == PR_TRUE);
+        thread->io_pending = PR_FALSE;
+        _PR_THREAD_UNLOCK(thread);
+        rc = WaitForSingleObject(thread->md.blocked_sema, INFINITE);
+        PR_ASSERT(rc == WAIT_OBJECT_0);
+    }
+
+    thread->md.blocked_io_status = rv;
+    thread->md.blocked_io_bytes = bytes;
+    rc = ResetEvent(thread->md.thr_event);
+    PR_ASSERT(rc != 0);
+    return;
+}
+
+static PRStatus
+_native_thread_io_wait(PRThread *thread, PRIntervalTime ticks)
+{
+    DWORD rv, bytes;
+#define _NATIVE_IO_WAIT_HANDLES		2
+#define _NATIVE_WAKEUP_EVENT_INDEX	0
+#define _NATIVE_IO_EVENT_INDEX		1
+
+	HANDLE wait_handles[_NATIVE_IO_WAIT_HANDLES];
+
+	PRUint32 msecs = (ticks == PR_INTERVAL_NO_TIMEOUT) ?
+		INFINITE : PR_IntervalToMilliseconds(ticks);
+
+    PR_ASSERT(thread->flags & _PR_GLOBAL_SCOPE);
+
+	wait_handles[0] = thread->md.blocked_sema;
+	wait_handles[1] = thread->md.thr_event;
+	rv = WaitForMultipleObjects(_NATIVE_IO_WAIT_HANDLES, wait_handles,
+										FALSE, msecs);
+
+	switch(rv) {
+		case WAIT_OBJECT_0 + _NATIVE_IO_EVENT_INDEX:
+			/*
+			 * I/O op completed
+			 */
+			_PR_THREAD_LOCK(thread);
+			if (thread->state == _PR_IO_WAIT) {
+
+				PR_ASSERT(thread->io_suspended == PR_FALSE);
+				PR_ASSERT(thread->io_pending == PR_TRUE);
+				thread->state = _PR_RUNNING;
+				thread->io_pending = PR_FALSE;
+				_PR_THREAD_UNLOCK(thread);
+			} else {
+				/* The IO completed just at the same time the
+				 * thread was interrupted. This led to us being
+				 * notified twice. Call WaitForSingleObject()
+				 * to clear the semaphore.
+				 */
+				PR_ASSERT(thread->io_suspended == PR_TRUE);
+				PR_ASSERT(thread->io_pending == PR_TRUE);
+				thread->io_pending = PR_FALSE;
+				_PR_THREAD_UNLOCK(thread);
+				rv = WaitForSingleObject(thread->md.blocked_sema,
+							INFINITE);
+				PR_ASSERT(rv == WAIT_OBJECT_0);
+			}
+
+			rv = GetOverlappedResult((HANDLE) thread->io_fd,
+				&thread->md.overlapped.overlapped, &bytes, FALSE);
+
+			thread->md.blocked_io_status = rv;
+			if (rv != 0) {
+				thread->md.blocked_io_bytes = bytes;
+			} else {
+				thread->md.blocked_io_error = GetLastError();
+				PR_ASSERT(ERROR_IO_PENDING != thread->md.blocked_io_error);
+			}
+			rv = ResetEvent(thread->md.thr_event);
+			PR_ASSERT(rv != 0);
+			break;
+		case WAIT_OBJECT_0 + _NATIVE_WAKEUP_EVENT_INDEX:
+			/*
+			 * I/O interrupted; 
+			 */
+#ifdef DEBUG
+			_PR_THREAD_LOCK(thread);
+			PR_ASSERT(thread->io_suspended == PR_TRUE);
+			_PR_THREAD_UNLOCK(thread);
+#endif
+			break;
+		case WAIT_TIMEOUT:
+			_PR_THREAD_LOCK(thread);
+			if (thread->state == _PR_IO_WAIT) {
+				thread->state = _PR_RUNNING;
+				thread->io_suspended = PR_TRUE;
+				_PR_THREAD_UNLOCK(thread);
+			} else {
+				/*
+				 * The thread was interrupted just as the timeout
+				 * occurred. This left the semaphore in the signaled
+				 * state. Call WaitForSingleObject() to clear the
+				 * semaphore.
+				 */
+				PR_ASSERT(thread->io_suspended == PR_TRUE);
+				_PR_THREAD_UNLOCK(thread);
+				rv = WaitForSingleObject(thread->md.blocked_sema, INFINITE);
+				PR_ASSERT(rv == WAIT_OBJECT_0);
+			}
+			break;
+		default:
+			return PR_FAILURE;
+			break;
+	}
+
+    return PR_SUCCESS;
+}
+
+
+static PRStatus
+_NT_IO_WAIT(PRThread *thread, PRIntervalTime timeout)
+{
+    PRBool fWait = PR_TRUE;
+
+	if (_native_threads_only) {
+		return(_native_thread_io_wait(thread, timeout));
+	}
+    if (!_PR_IS_NATIVE_THREAD(thread))  {
+
+        _PR_THREAD_LOCK(thread);
+
+        /* The IO may have already completed; if so, don't add to sleepQ, 
+         * since we are already on the runQ!
+         */
+        if (thread->io_pending == PR_TRUE) {
+            _PR_SLEEPQ_LOCK(thread->cpu);
+            _PR_ADD_SLEEPQ(thread, timeout);
+            _PR_SLEEPQ_UNLOCK(thread->cpu);
+        } else
+            fWait = PR_FALSE;
+        _PR_THREAD_UNLOCK(thread);
+    }
+    if (fWait)
+        return _PR_MD_WAIT(thread, timeout);
+    else
+        return PR_SUCCESS;
+}
+
+/*
+ * Unblock threads waiting for I/O
+ * used when interrupting threads
+ *
+ * NOTE: The thread lock should held when this function is called.
+ * On return, the thread lock is released.
+ */
+void _PR_Unblock_IO_Wait(PRThread *thr)
+{
+    PRStatus rv;
+    _PRCPU *cpu = thr->cpu;
+ 
+    PR_ASSERT(thr->state == _PR_IO_WAIT);
+	/*
+	 * A thread for which an I/O timed out or was interrupted cannot be
+	 * in an IO_WAIT state except as a result of calling PR_Close or
+	 * PR_NT_CancelIo for the FD. For these two cases, _PR_IO_WAIT state
+	 * is not interruptible
+	 */
+	if (thr->md.interrupt_disabled == PR_TRUE) {
+    	_PR_THREAD_UNLOCK(thr);
+		return;
+	}
+    thr->io_suspended = PR_TRUE;
+    thr->state = _PR_RUNNABLE;
+
+    if (!_PR_IS_NATIVE_THREAD(thr)) {
+        PRThread *me = _PR_MD_CURRENT_THREAD();
+        PR_ASSERT(thr->flags & (_PR_ON_SLEEPQ | _PR_ON_PAUSEQ));
+        _PR_SLEEPQ_LOCK(cpu);
+        _PR_DEL_SLEEPQ(thr, PR_TRUE);
+        _PR_SLEEPQ_UNLOCK(cpu);
+		/*
+		 * this thread will continue to run on the same cpu until the
+		 * I/O is aborted by closing the FD or calling CancelIO
+		 */
+		thr->md.thr_bound_cpu = cpu;
+
+        PR_ASSERT(!(thr->flags & _PR_IDLE_THREAD));
+        _PR_AddThreadToRunQ(me, thr);
+    }
+    _PR_THREAD_UNLOCK(thr);
+    rv = _PR_MD_WAKEUP_WAITER(thr);
+    PR_ASSERT(PR_SUCCESS == rv);
+}
+
+/* Resume an outstanding IO; requires that after the switch, we disable */
+static PRStatus
+_NT_ResumeIO(PRThread *thread, PRIntervalTime ticks)
+{
+    PRBool fWait = PR_TRUE;
+
+    if (!_PR_IS_NATIVE_THREAD(thread)) {
+        if (_pr_use_static_tls) {
+            _pr_io_restarted_io = thread;
+        } else {
+            TlsSetValue(_pr_io_restartedIOIndex, thread);
+        }
+    } else {
+        _PR_THREAD_LOCK(thread);
+        if (!thread->io_pending)
+            fWait = PR_FALSE;
+        thread->io_suspended = PR_FALSE;
+            
+        _PR_THREAD_UNLOCK(thread);
+    }
+    /* We don't put ourselves back on the sleepQ yet; until we 
+     * set the suspended bit to false, we can't do that.  Just save
+     * the sleep time here, and then continue.  The restarted_io handler
+     * will add us to the sleepQ if needed.
+     */
+    thread->sleep = ticks;
+
+    if (fWait) {
+        if (!_PR_IS_NATIVE_THREAD(thread))
+            return _PR_MD_WAIT(thread, ticks);
+        else
+            return _NT_IO_WAIT(thread, ticks);
+    }
+    return PR_SUCCESS;
+}
+
+PRStatus
+_PR_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if (thread == NULL) {
+        /* If thread is NULL, we aren't waking a thread, we're just poking
+         * idle thread 
+         */
+        if ( PostQueuedCompletionStatus(_pr_completion_port, 0, 
+            KEY_CVAR, NULL) == FALSE) 
+            return PR_FAILURE;
+        return PR_SUCCESS;
+    }
+
+    if ( _PR_IS_NATIVE_THREAD(thread) ) {
+        if (ReleaseSemaphore(thread->md.blocked_sema, 1, NULL) == FALSE)
+            return PR_FAILURE;
+        else
+            return PR_SUCCESS;
+    } else {
+        PRThread *me = _PR_MD_CURRENT_THREAD();
+
+        /* When a Native thread has to awaken a user thread, it has to poke
+         * the completion port because all user threads might be idle, and
+         * thus the CPUs are just waiting for a completion.  
+         *
+         * XXXMB - can we know when we are truely idle (and not checking 
+         *         the runq)?
+         */
+        if ((_PR_IS_NATIVE_THREAD(me) || (thread->cpu != me->cpu)) &&
+                (!thread->md.thr_bound_cpu)) {
+            /* The thread should not be in any queue */
+            PR_ASSERT(thread->queueCount == 0);
+            if ( PostQueuedCompletionStatus(_pr_completion_port, 0, 
+                KEY_CVAR, &(thread->md.overlapped.overlapped)) == FALSE) 
+                return PR_FAILURE;
+        }
+        return PR_SUCCESS;
+    }
+}
+
+void
+_PR_MD_INIT_IO()
+{
+    WORD WSAVersion = 0x0101;
+    WSADATA WSAData;
+    int err;
+    OSVERSIONINFO OSversion;
+
+    err = WSAStartup( WSAVersion, &WSAData );
+    PR_ASSERT(0 == err);
+                                                      
+    _pr_completion_port = CreateIoCompletionPort(INVALID_HANDLE_VALUE, 
+                                                 NULL, 
+                                                 0, 
+                                                 0);
+ 
+    _MD_NEW_LOCK(&_pr_recycle_lock);
+    _MD_NEW_LOCK(&_pr_ioq_lock);
+
+    OSversion.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
+    if (GetVersionEx(&OSversion)) {
+        _nt_version_gets_lockfile_completion = PR_FALSE;
+        if (OSversion.dwMajorVersion >= 4) {
+            _nt_version_gets_lockfile_completion = PR_TRUE;
+        }
+    } else 
+        PR_ASSERT(0);
+
+#ifdef _NEED_351_FILE_LOCKING_HACK
+    IsFileLocalInit();
+#endif /* _NEED_351_FILE_LOCKING_HACK */
+
+    /*
+     * UDP support: start up the continuation thread
+     */
+
+    pt_tq.op_count = 0;
+    pt_tq.head = pt_tq.tail = NULL;
+    pt_tq.ml = PR_NewLock();
+    PR_ASSERT(NULL != pt_tq.ml);
+    pt_tq.new_op = PR_NewCondVar(pt_tq.ml);
+    PR_ASSERT(NULL != pt_tq.new_op);
+#if defined(DEBUG)
+    memset(&pt_debug, 0, sizeof(struct pt_debug_s));
+#endif
+
+    pt_tq.thread = PR_CreateThread(
+        PR_SYSTEM_THREAD, ContinuationThread, NULL,
+        PR_PRIORITY_URGENT, PR_GLOBAL_THREAD, PR_JOINABLE_THREAD, 0);
+
+    PR_ASSERT(NULL != pt_tq.thread);
+
+#ifdef DEBUG
+    /* Doublecheck _pr_filetime_offset's hard-coded value is correct. */
+    {
+        SYSTEMTIME systime;
+        union {
+           PRTime prt;
+           FILETIME ft;
+        } filetime;
+        BOOL rv;
+
+        systime.wYear = 1970;
+        systime.wMonth = 1;
+        /* wDayOfWeek is ignored */
+        systime.wDay = 1;
+        systime.wHour = 0;
+        systime.wMinute = 0;
+        systime.wSecond = 0;
+        systime.wMilliseconds = 0;
+
+        rv = SystemTimeToFileTime(&systime, &filetime.ft);
+        PR_ASSERT(0 != rv);
+        PR_ASSERT(filetime.prt == _pr_filetime_offset);
+    }
+#endif /* DEBUG */
+
+    _PR_NT_InitSids();
+}
+
+/* --- SOCKET IO --------------------------------------------------------- */
+
+/* _md_get_recycled_socket()
+ * Get a socket from the recycle bin; if no sockets are in the bin,
+ * create one.  The socket will be passed to AcceptEx() as the
+ * second argument.
+ */
+static SOCKET
+_md_get_recycled_socket(int af)
+{
+    SOCKET rv;
+
+    _MD_LOCK(&_pr_recycle_lock);
+    if (af == AF_INET && _pr_recycle_INET_tail) {
+        _pr_recycle_INET_tail--;
+        rv = _pr_recycle_INET_array[_pr_recycle_INET_tail];
+        _MD_UNLOCK(&_pr_recycle_lock);
+        return rv;
+    }
+    if (af == AF_INET6 && _pr_recycle_INET6_tail) {
+        _pr_recycle_INET6_tail--;
+        rv = _pr_recycle_INET6_array[_pr_recycle_INET6_tail];
+        _MD_UNLOCK(&_pr_recycle_lock);
+        return rv;
+    }
+    _MD_UNLOCK(&_pr_recycle_lock);
+
+    rv = _PR_MD_SOCKET(af, SOCK_STREAM, 0);
+    if (rv != INVALID_SOCKET && _md_Associate((HANDLE)rv) == 0) {
+        closesocket(rv);
+        return INVALID_SOCKET;
+    }
+    return rv;
+}
+
+/* _md_put_recycled_socket()
+ * Add a socket to the recycle bin.
+ */
+static void
+_md_put_recycled_socket(SOCKET newsock, int af)
+{
+    PR_ASSERT(_pr_recycle_INET_tail >= 0);
+    PR_ASSERT(_pr_recycle_INET6_tail >= 0);
+
+    _MD_LOCK(&_pr_recycle_lock);
+    if (af == AF_INET && _pr_recycle_INET_tail < RECYCLE_SIZE) {
+        _pr_recycle_INET_array[_pr_recycle_INET_tail] = newsock;
+        _pr_recycle_INET_tail++;
+        _MD_UNLOCK(&_pr_recycle_lock);
+    } else if (af == AF_INET6 && _pr_recycle_INET6_tail < RECYCLE_SIZE) {
+        _pr_recycle_INET6_array[_pr_recycle_INET6_tail] = newsock;
+        _pr_recycle_INET6_tail++;
+        _MD_UNLOCK(&_pr_recycle_lock);
+    } else {
+        _MD_UNLOCK(&_pr_recycle_lock);
+        closesocket(newsock);
+    }
+ 
+    return;
+}
+
+/* _md_Associate()
+ * Associates a file with the completion port.
+ * Returns 0 on failure, 1 on success.
+ */
+PRInt32
+_md_Associate(HANDLE file)
+{
+    HANDLE port;
+
+	if (!_native_threads_only) {
+		port = CreateIoCompletionPort((HANDLE)file, 
+										_pr_completion_port, 
+										KEY_IO,
+										0);
+
+		/* XXX should map error codes on failures */
+		return (port == _pr_completion_port);
+	} else {
+		return 1;
+	}
+}
+
+/*
+ * _md_MakeNonblock()
+ * Make a socket nonblocking.
+ * Returns 0 on failure, 1 on success.
+ */
+static PRInt32
+_md_MakeNonblock(HANDLE file)
+{
+    int rv;
+    u_long one = 1;
+
+    rv = ioctlsocket((SOCKET)file, FIONBIO, &one);
+    /* XXX should map error codes on failures */
+    return (rv == 0);
+}
+
+static int missing_completions = 0;
+static int max_wait_loops = 0;
+
+static PRInt32
+_NT_IO_ABORT(PROsfd sock)
+{
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    PRBool fWait;
+    PRInt32 rv;
+    int loop_count;
+
+    /* This is a clumsy way to abort the IO, but it is all we can do.
+     * It looks a bit racy, but we handle all the cases. 
+     * case 1:  IO completes before calling closesocket
+     *     case 1a:  fWait is set to PR_FALSE
+     *           This should e the most likely case.  We'll properly
+     *           not wait call _NT_IO_WAIT, since the closesocket()
+     *           won't be forcing a completion.
+     *     case 1b: fWait is set to PR_TRUE
+     *           This hopefully won't happen much.  When it does, this
+     *           thread will timeout in _NT_IO_WAIT for CLOSE_INTERVAL
+     *           before cleaning up.
+     * case 2:  IO does not complete before calling closesocket
+     *     case 2a: IO never completes
+     *           This is the likely case.  We'll close it and wait
+     *           for the completion forced by the close.  Return should
+     *           be immediate.
+     *     case 2b: IO completes just after calling closesocket
+     *           Since the closesocket is issued, we'll either get a
+     *           completion back for the real IO or for the close.  We
+     *           don't really care.  It may not even be possible to get
+     *           a real completion here.  In any event, we'll awaken
+     *           from NT_IO_WAIT immediately.
+     */
+
+    _PR_THREAD_LOCK(me);
+    fWait = me->io_pending;
+    if (fWait) {
+        /*
+         * If there's still I/O pending, it should have already timed
+         * out once before this function is called.
+         */
+        PR_ASSERT(me->io_suspended == PR_TRUE);
+
+        /* Set up to wait for I/O completion again */
+        me->state = _PR_IO_WAIT;
+        me->io_suspended = PR_FALSE;
+        me->md.interrupt_disabled = PR_TRUE;
+    }
+    _PR_THREAD_UNLOCK(me);
+
+    /* Close the socket if there is one */
+    if (sock != INVALID_SOCKET) {
+        rv = closesocket((SOCKET)sock);
+    }
+
+    /* If there was I/O pending before the close, wait for it to complete */
+    if (fWait) {
+
+        /* Wait and wait for the I/O to complete */
+        for (loop_count = 0; fWait; ++loop_count) {
+
+            _NT_IO_WAIT(me, CLOSE_TIMEOUT);
+
+            _PR_THREAD_LOCK(me);
+            fWait = me->io_pending;
+            if (fWait) {
+                PR_ASSERT(me->io_suspended == PR_TRUE);
+                me->state = _PR_IO_WAIT;
+                me->io_suspended = PR_FALSE;
+            }
+            _PR_THREAD_UNLOCK(me);
+
+            if (loop_count > max_wait_loops) {
+                max_wait_loops = loop_count;
+            }
+        }
+
+        if (loop_count > 1) {
+            ++missing_completions;
+        }
+
+        me->md.interrupt_disabled = PR_FALSE;
+        me->io_pending = PR_FALSE;
+        me->state = _PR_RUNNING;
+    }
+
+    PR_ASSERT(me->io_pending == PR_FALSE);
+    me->md.thr_bound_cpu = NULL;
+    me->io_suspended = PR_FALSE;
+
+    return rv;
+}
+
+
+PROsfd
+_PR_MD_SOCKET(int af, int type, int flags)
+{
+    SOCKET sock;
+
+    sock = socket(af, type, flags);
+
+    if (sock == INVALID_SOCKET) {
+        _PR_MD_MAP_SOCKET_ERROR(WSAGetLastError());
+    }
+
+    return (PROsfd)sock;
+}
+
+struct connect_data_s {
+    PRInt32 status;
+    PRInt32 error;
+    PROsfd  osfd;
+    struct sockaddr *addr;
+    PRUint32 addrlen;
+    PRIntervalTime timeout;
+};
+
+void
+_PR_MD_connect_thread(void *cdata)
+{
+    struct connect_data_s *cd = (struct connect_data_s *)cdata;
+
+    cd->status = connect(cd->osfd, cd->addr, cd->addrlen);
+
+    if (cd->status == SOCKET_ERROR)
+        cd->error = WSAGetLastError();
+
+    return;
+}
+
+
+PRInt32
+_PR_MD_CONNECT(PRFileDesc *fd, const PRNetAddr *addr, PRUint32 addrlen, 
+               PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    u_long nbio;
+    PRInt32 rc;
+
+    if (fd->secret->nonblocking) {
+        if (!fd->secret->md.io_model_committed) {
+            rv = _md_MakeNonblock((HANDLE)osfd);
+            PR_ASSERT(0 != rv);
+            fd->secret->md.io_model_committed = PR_TRUE;
+        }
+
+        if ((rv = connect(osfd, (struct sockaddr *) addr, addrlen)) == -1) {
+            err = WSAGetLastError();
+            _PR_MD_MAP_CONNECT_ERROR(err);
+        }
+        return rv;
+    }
+
+    /*
+     * Temporarily make the socket non-blocking so that we can
+     * initiate a non-blocking connect and wait for its completion
+     * (with a timeout) in select.
+     */
+    PR_ASSERT(!fd->secret->md.io_model_committed);
+    nbio = 1;
+    rv = ioctlsocket((SOCKET)osfd, FIONBIO, &nbio);
+    PR_ASSERT(0 == rv);
+
+    rc = _nt_nonblock_connect(fd, (struct sockaddr *) addr, addrlen, timeout);
+
+    /* Set the socket back to blocking. */
+    nbio = 0;
+    rv = ioctlsocket((SOCKET)osfd, FIONBIO, &nbio);
+    PR_ASSERT(0 == rv);
+
+    return rc;
+}
+
+PRInt32
+_PR_MD_BIND(PRFileDesc *fd, const PRNetAddr *addr, PRUint32 addrlen)
+{
+    PRInt32 rv;
+#if 0
+    int one = 1;
+#endif
+
+    rv = bind(fd->secret->md.osfd, (const struct sockaddr *)&(addr->inet), addrlen);
+
+    if (rv == SOCKET_ERROR) {
+        _PR_MD_MAP_BIND_ERROR(WSAGetLastError());
+        return -1;
+    }
+
+#if 0
+    /* Disable nagle- so far unknown if this is good or not...
+     */
+    rv = setsockopt(fd->secret->md.osfd, 
+                    SOL_SOCKET,
+                    TCP_NODELAY,
+                    (const char *)&one,
+                    sizeof(one));
+    PR_ASSERT(rv == 0);
+#endif
+
+    return 0;
+}
+
+void _PR_MD_UPDATE_ACCEPT_CONTEXT(PROsfd accept_sock, PROsfd listen_sock)
+{
+    /* Sockets accept()'d with AcceptEx need to call this setsockopt before
+     * calling anything other than ReadFile(), WriteFile(), send(), recv(), 
+     * Transmitfile(), and closesocket().  In order to call any other 
+     * winsock functions, we have to make this setsockopt call.
+     *
+     * XXXMB - For the server, we *NEVER* need this in
+     * the "normal" code path.  But now we have to call it.  This is a waste
+     * of a system call.  We'd like to only call it before calling the 
+     * obscure socket calls, but since we don't know at that point what the
+     * original socket was (or even if it is still alive) we can't do it
+     * at that point... 
+     */
+    setsockopt((SOCKET)accept_sock, 
+               SOL_SOCKET, 
+               SO_UPDATE_ACCEPT_CONTEXT,
+               (char *)&listen_sock,
+               sizeof(listen_sock));
+
+}
+
+#define INET_ADDR_PADDED (sizeof(PRNetAddr) + 16)
+PROsfd
+_PR_MD_FAST_ACCEPT(PRFileDesc *fd, PRNetAddr *raddr, PRUint32 *rlen,
+              PRIntervalTime timeout, PRBool fast, 
+              _PR_AcceptTimeoutCallback callback, void *callbackArg)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    SOCKET accept_sock;
+    int bytes;
+    PRNetAddr *Laddr;
+    PRNetAddr *Raddr;
+    PRUint32 llen, err;
+    int rv;
+
+    if (_NT_USE_NB_IO(fd)) {
+        if (!fd->secret->md.io_model_committed) {
+            rv = _md_MakeNonblock((HANDLE)osfd);
+            PR_ASSERT(0 != rv);
+            fd->secret->md.io_model_committed = PR_TRUE;
+        }
+        /*
+         * The accepted socket inherits the nonblocking and
+         * inheritable (HANDLE_FLAG_INHERIT) attributes of
+         * the listening socket.
+         */
+        accept_sock = _nt_nonblock_accept(fd, (struct sockaddr *)raddr, rlen, timeout);
+        if (!fd->secret->nonblocking) {
+            u_long zero = 0;
+
+            rv = ioctlsocket(accept_sock, FIONBIO, &zero);
+            PR_ASSERT(0 == rv);
+        }
+        return accept_sock;
+    }
+
+    if (me->io_suspended) {
+        PR_SetError(PR_INVALID_STATE_ERROR, 0);
+        return -1;
+    }
+
+    if (!fd->secret->md.io_model_committed) {
+        rv = _md_Associate((HANDLE)osfd);
+        PR_ASSERT(0 != rv);
+        fd->secret->md.io_model_committed = PR_TRUE;
+    }
+
+    if (!me->md.acceptex_buf) {
+        me->md.acceptex_buf = PR_MALLOC(2*INET_ADDR_PADDED);
+        if (!me->md.acceptex_buf) {
+            PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+            return -1;
+        }
+    }
+
+    accept_sock = _md_get_recycled_socket(fd->secret->af);
+    if (accept_sock == INVALID_SOCKET)
+        return -1;
+
+    memset(&(me->md.overlapped.overlapped), 0, sizeof(OVERLAPPED));
+	if (_native_threads_only)
+		me->md.overlapped.overlapped.hEvent = me->md.thr_event;
+
+    _PR_THREAD_LOCK(me);
+	if (_PR_PENDING_INTERRUPT(me)) {
+		me->flags &= ~_PR_INTERRUPT;
+		PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+    	_PR_THREAD_UNLOCK(me);
+		closesocket(accept_sock);
+		return -1;
+	}
+    me->io_pending = PR_TRUE;
+    me->state = _PR_IO_WAIT;
+    _PR_THREAD_UNLOCK(me);
+    me->io_fd = osfd;
+
+    rv = AcceptEx((SOCKET)osfd,
+                  accept_sock,
+                  me->md.acceptex_buf,
+                  0,
+                  INET_ADDR_PADDED,
+                  INET_ADDR_PADDED,
+                  &bytes,
+                  &(me->md.overlapped.overlapped));
+
+    if ( (rv == 0) && ((err = WSAGetLastError()) != ERROR_IO_PENDING))  {
+        /* Argh! The IO failed */
+		closesocket(accept_sock);
+		_PR_THREAD_LOCK(me);
+		me->io_pending = PR_FALSE;
+		me->state = _PR_RUNNING;
+		if (_PR_PENDING_INTERRUPT(me)) {
+			me->flags &= ~_PR_INTERRUPT;
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+			_PR_THREAD_UNLOCK(me);
+			return -1;
+		}
+		_PR_THREAD_UNLOCK(me);
+
+		_PR_MD_MAP_ACCEPTEX_ERROR(err);
+        return -1;
+    }
+
+    if (_native_threads_only && rv) {
+        _native_thread_io_nowait(me, rv, bytes);
+    } else if (_NT_IO_WAIT(me, timeout) == PR_FAILURE) {
+        PR_ASSERT(0);
+        closesocket(accept_sock);
+        return -1;
+    }
+
+    PR_ASSERT(me->io_pending == PR_FALSE || me->io_suspended == PR_TRUE);
+
+    if (me->io_suspended) {
+        closesocket(accept_sock);
+        if (_PR_PENDING_INTERRUPT(me)) {
+            me->flags &= ~_PR_INTERRUPT;
+            PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+        } else {
+            PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+        }
+        return -1;
+    }
+
+    if (me->md.blocked_io_status == 0) {
+		closesocket(accept_sock);
+		_PR_MD_MAP_ACCEPTEX_ERROR(me->md.blocked_io_error);
+        return -1;
+    }
+
+    if (!fast)
+        _PR_MD_UPDATE_ACCEPT_CONTEXT((SOCKET)accept_sock, (SOCKET)osfd);
+
+    /* IO is done */
+    GetAcceptExSockaddrs(
+            me->md.acceptex_buf,
+            0,
+            INET_ADDR_PADDED,
+            INET_ADDR_PADDED,
+            (LPSOCKADDR *)&(Laddr),
+            &llen,
+            (LPSOCKADDR *)&(Raddr),
+            (unsigned int *)rlen);
+
+    if (raddr != NULL)
+        memcpy((char *)raddr, (char *)&Raddr->inet, *rlen);
+
+    PR_ASSERT(me->io_pending == PR_FALSE);
+
+    return accept_sock;
+}
+
+PRInt32
+_PR_MD_FAST_ACCEPT_READ(PRFileDesc *sd, PROsfd *newSock, PRNetAddr **raddr, 
+                   void *buf, PRInt32 amount, PRIntervalTime timeout, 
+                   PRBool fast, _PR_AcceptTimeoutCallback callback, 
+                   void *callbackArg)
+{
+    PROsfd sock = sd->secret->md.osfd;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    int bytes;
+    PRNetAddr *Laddr;
+    PRUint32 llen, rlen, err;
+    int rv;
+    PRBool isConnected;
+    PRBool madeCallback = PR_FALSE;
+
+    if (me->io_suspended) {
+        PR_SetError(PR_INVALID_STATE_ERROR, 0);
+        return -1;
+    }
+
+    if (!sd->secret->md.io_model_committed) {
+        rv = _md_Associate((HANDLE)sock);
+        PR_ASSERT(0 != rv);
+        sd->secret->md.io_model_committed = PR_TRUE;
+    }
+
+    *newSock = _md_get_recycled_socket(sd->secret->af);
+    if (*newSock == INVALID_SOCKET)
+        return -1;
+
+    memset(&(me->md.overlapped.overlapped), 0, sizeof(OVERLAPPED));
+	if (_native_threads_only)
+		me->md.overlapped.overlapped.hEvent = me->md.thr_event;
+
+    _PR_THREAD_LOCK(me);
+	if (_PR_PENDING_INTERRUPT(me)) {
+		me->flags &= ~_PR_INTERRUPT;
+		PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+    	_PR_THREAD_UNLOCK(me);
+		closesocket(*newSock);
+		return -1;
+	}
+    me->io_pending = PR_TRUE;
+    me->state = _PR_IO_WAIT;
+    _PR_THREAD_UNLOCK(me);
+    me->io_fd = sock;
+
+    rv = AcceptEx((SOCKET)sock,
+                  *newSock,
+                  buf,
+                  amount,
+                  INET_ADDR_PADDED,
+                  INET_ADDR_PADDED,
+                  &bytes,
+                  &(me->md.overlapped.overlapped));
+
+    if ( (rv == 0) && ((err = GetLastError()) != ERROR_IO_PENDING)) {
+		closesocket(*newSock);
+		_PR_THREAD_LOCK(me);
+		me->io_pending = PR_FALSE;
+		me->state = _PR_RUNNING;
+		if (_PR_PENDING_INTERRUPT(me)) {
+			me->flags &= ~_PR_INTERRUPT;
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+			_PR_THREAD_UNLOCK(me);
+			return -1;
+		}
+		_PR_THREAD_UNLOCK(me);
+
+		_PR_MD_MAP_ACCEPTEX_ERROR(err);
+        return -1;
+    }
+
+    if (_native_threads_only && rv) {
+        _native_thread_io_nowait(me, rv, bytes);
+    } else if (_NT_IO_WAIT(me, timeout) == PR_FAILURE) {
+        PR_ASSERT(0);
+        closesocket(*newSock);
+        return -1;
+    }
+
+retry:
+    if (me->io_suspended) {
+        PRInt32 err;
+        INT seconds;
+        INT bytes = sizeof(seconds);
+
+        PR_ASSERT(timeout != PR_INTERVAL_NO_TIMEOUT);
+
+        err = getsockopt(*newSock, 
+                         SOL_SOCKET,
+                         SO_CONNECT_TIME,
+                         (char *)&seconds,
+                         (PINT)&bytes);
+        if ( err == NO_ERROR ) {
+            PRIntervalTime elapsed = PR_SecondsToInterval(seconds);
+
+            if (seconds == 0xffffffff) 
+                isConnected = PR_FALSE;
+            else 
+                isConnected = PR_TRUE;
+
+            if (!isConnected) {
+                if (madeCallback == PR_FALSE && callback)
+                    callback(callbackArg);
+                madeCallback = PR_TRUE;
+                me->state = _PR_IO_WAIT;
+                if (_NT_ResumeIO(me, timeout) == PR_FAILURE) {
+                    closesocket(*newSock);
+                    return -1;
+                }
+                goto retry;
+            }
+
+            if (elapsed < timeout) {
+                /* Socket is connected but time not elapsed, RESUME IO */
+                timeout -= elapsed;
+                me->state = _PR_IO_WAIT;
+                if (_NT_ResumeIO(me, timeout) == PR_FAILURE) {
+                    closesocket(*newSock);
+                    return -1;
+                }
+                goto retry;
+            }
+        } else {
+            /*  What to do here? Assume socket not open?*/
+            PR_ASSERT(0);
+            isConnected = PR_FALSE;
+        }
+
+        rv = _NT_IO_ABORT(*newSock);
+
+        PR_ASSERT(me->io_pending ==  PR_FALSE);
+        PR_ASSERT(me->io_suspended ==  PR_FALSE);
+        PR_ASSERT(me->md.thr_bound_cpu ==  NULL);
+        /* If the IO is still suspended, it means we didn't get any 
+         * completion from NT_IO_WAIT.  This is not disasterous, I hope,
+         * but it may mean we still have an IO outstanding...  Try to 
+         * recover by just allowing ourselves to continue.
+         */
+        me->io_suspended = PR_FALSE;
+        if (_PR_PENDING_INTERRUPT(me)) {
+            me->flags &= ~_PR_INTERRUPT;
+            PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+        } else {
+            PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+        }
+        me->state = _PR_RUNNING;
+        closesocket(*newSock);
+        return -1;
+    }
+
+    PR_ASSERT(me->io_pending == PR_FALSE);
+    PR_ASSERT(me->io_suspended == PR_FALSE);
+    PR_ASSERT(me->md.thr_bound_cpu == NULL);
+
+    if (me->md.blocked_io_status == 0) {
+		_PR_MD_MAP_ACCEPTEX_ERROR(me->md.blocked_io_error);
+        closesocket(*newSock);
+        return -1;
+    }
+
+    if (!fast) 
+        _PR_MD_UPDATE_ACCEPT_CONTEXT((SOCKET)*newSock, (SOCKET)sock);
+
+    /* IO is done */
+    GetAcceptExSockaddrs(
+            buf,
+            amount,
+            INET_ADDR_PADDED,
+            INET_ADDR_PADDED,
+            (LPSOCKADDR *)&(Laddr),
+            &llen,
+            (LPSOCKADDR *)(raddr),
+            (unsigned int *)&rlen);
+
+    return me->md.blocked_io_bytes;
+}
+
+PRInt32
+_PR_MD_SENDFILE(PRFileDesc *sock, PRSendFileData *sfd,
+					PRInt32 flags, PRIntervalTime timeout)
+{
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    PRInt32 tflags;
+    int rv, err;
+
+    if (me->io_suspended) {
+        PR_SetError(PR_INVALID_STATE_ERROR, 0);
+        return -1;
+    }
+
+    if (!sock->secret->md.io_model_committed) {
+        rv = _md_Associate((HANDLE)sock->secret->md.osfd);
+        PR_ASSERT(0 != rv);
+        sock->secret->md.io_model_committed = PR_TRUE;
+    }
+    if (!me->md.xmit_bufs) {
+        me->md.xmit_bufs = PR_NEW(TRANSMIT_FILE_BUFFERS);
+        if (!me->md.xmit_bufs) {
+            PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+            return -1;
+        }
+    }
+    me->md.xmit_bufs->Head       = (void *)sfd->header;
+    me->md.xmit_bufs->HeadLength = sfd->hlen;
+    me->md.xmit_bufs->Tail       = (void *)sfd->trailer;
+    me->md.xmit_bufs->TailLength = sfd->tlen;
+
+    memset(&(me->md.overlapped.overlapped), 0, sizeof(OVERLAPPED));
+    me->md.overlapped.overlapped.Offset = sfd->file_offset;
+	if (_native_threads_only)
+		me->md.overlapped.overlapped.hEvent = me->md.thr_event;
+
+    tflags = 0;
+    if (flags & PR_TRANSMITFILE_CLOSE_SOCKET)
+        tflags = TF_DISCONNECT | TF_REUSE_SOCKET;
+
+    _PR_THREAD_LOCK(me);
+	if (_PR_PENDING_INTERRUPT(me)) {
+		me->flags &= ~_PR_INTERRUPT;
+		PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+    	_PR_THREAD_UNLOCK(me);
+		return -1;
+	}
+    me->io_pending = PR_TRUE;
+    me->state = _PR_IO_WAIT;
+    _PR_THREAD_UNLOCK(me);
+    me->io_fd = sock->secret->md.osfd;
+
+    rv = TransmitFile((SOCKET)sock->secret->md.osfd,
+                      (HANDLE)sfd->fd->secret->md.osfd,
+                      (DWORD)sfd->file_nbytes,
+                      (DWORD)0,
+                      (LPOVERLAPPED)&(me->md.overlapped.overlapped),
+                      (TRANSMIT_FILE_BUFFERS *)me->md.xmit_bufs,
+                      (DWORD)tflags);
+    if ( (rv == 0) && ((err = GetLastError()) != ERROR_IO_PENDING) ) {
+		_PR_THREAD_LOCK(me);
+		me->io_pending = PR_FALSE;
+		me->state = _PR_RUNNING;
+		if (_PR_PENDING_INTERRUPT(me)) {
+			me->flags &= ~_PR_INTERRUPT;
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+			_PR_THREAD_UNLOCK(me);
+			return -1;
+		}
+		_PR_THREAD_UNLOCK(me);
+
+		_PR_MD_MAP_TRANSMITFILE_ERROR(err);
+        return -1;
+    }
+
+    if (_NT_IO_WAIT(me, timeout) == PR_FAILURE) {
+        PR_ASSERT(0);
+        return -1;
+    }
+
+    PR_ASSERT(me->io_pending == PR_FALSE || me->io_suspended == PR_TRUE);
+
+    if (me->io_suspended) {
+        if (_PR_PENDING_INTERRUPT(me)) {
+            me->flags &= ~_PR_INTERRUPT;
+            PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+        } else {
+            PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+        }
+        return -1;
+    }
+
+    if (me->md.blocked_io_status == 0) {
+		_PR_MD_MAP_TRANSMITFILE_ERROR(me->md.blocked_io_error);
+        return -1;
+    }
+
+    if (flags & PR_TRANSMITFILE_CLOSE_SOCKET) {
+        _md_put_recycled_socket(sock->secret->md.osfd, sock->secret->af);
+    }
+
+    PR_ASSERT(me->io_pending == PR_FALSE);
+
+    return me->md.blocked_io_bytes;
+}
+
+PRInt32
+_PR_MD_RECV(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags, 
+            PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    int bytes;
+    int rv, err;
+
+    if (_NT_USE_NB_IO(fd)) {
+        if (!fd->secret->md.io_model_committed) {
+            rv = _md_MakeNonblock((HANDLE)osfd);
+            PR_ASSERT(0 != rv);
+            fd->secret->md.io_model_committed = PR_TRUE;
+        }
+        return _nt_nonblock_recv(fd, buf, amount, flags, timeout);
+    }
+
+    if (me->io_suspended) {
+        PR_SetError(PR_INVALID_STATE_ERROR, 0);
+        return -1;
+    }
+
+    if (!fd->secret->md.io_model_committed) {
+        rv = _md_Associate((HANDLE)osfd);
+        PR_ASSERT(0 != rv);
+        fd->secret->md.io_model_committed = PR_TRUE;
+    }
+
+    memset(&(me->md.overlapped.overlapped), 0, sizeof(OVERLAPPED));
+	if (_native_threads_only)
+		me->md.overlapped.overlapped.hEvent = me->md.thr_event;
+
+    _PR_THREAD_LOCK(me);
+	if (_PR_PENDING_INTERRUPT(me)) {
+		me->flags &= ~_PR_INTERRUPT;
+		PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+    	_PR_THREAD_UNLOCK(me);
+		return -1;
+	}
+    me->io_pending = PR_TRUE;
+    me->state = _PR_IO_WAIT;
+    _PR_THREAD_UNLOCK(me);
+    me->io_fd = osfd;
+
+    rv = ReadFile((HANDLE)osfd,
+                  buf, 
+                  amount,
+                  &bytes,
+                  &(me->md.overlapped.overlapped));
+    if ( (rv == 0) && (GetLastError() != ERROR_IO_PENDING) ) {
+    	_PR_THREAD_LOCK(me);
+        me->io_pending = PR_FALSE;
+        me->state = _PR_RUNNING;
+		if (_PR_PENDING_INTERRUPT(me)) {
+			me->flags &= ~_PR_INTERRUPT;
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+			_PR_THREAD_UNLOCK(me);
+			return -1;
+		}
+		_PR_THREAD_UNLOCK(me);
+
+        if ((err = GetLastError()) == ERROR_HANDLE_EOF)
+            return 0;
+		_PR_MD_MAP_READ_ERROR(err);
+        return -1;
+    }
+
+    if (_native_threads_only && rv) {
+        _native_thread_io_nowait(me, rv, bytes);
+    } else if (_NT_IO_WAIT(me, timeout) == PR_FAILURE) {
+        PR_ASSERT(0);
+        return -1;
+    }
+
+    PR_ASSERT(me->io_pending == PR_FALSE || me->io_suspended == PR_TRUE);
+
+    if (me->io_suspended) {
+        if (_PR_PENDING_INTERRUPT(me)) {
+            me->flags &= ~_PR_INTERRUPT;
+            PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+        } else {
+            PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+        }
+        return -1;
+    }
+
+    if (me->md.blocked_io_status == 0) {
+        if (me->md.blocked_io_error == ERROR_HANDLE_EOF)
+            return 0;
+		_PR_MD_MAP_READ_ERROR(me->md.blocked_io_error);
+        return -1;
+    }
+
+    PR_ASSERT(me->io_pending == PR_FALSE);
+
+    return me->md.blocked_io_bytes;
+}
+
+PRInt32
+_PR_MD_SEND(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+            PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    int bytes;
+    int rv, err;
+
+    if (_NT_USE_NB_IO(fd)) {
+        if (!fd->secret->md.io_model_committed) {
+            rv = _md_MakeNonblock((HANDLE)osfd);
+            PR_ASSERT(0 != rv);
+            fd->secret->md.io_model_committed = PR_TRUE;
+        }
+        return _nt_nonblock_send(fd, (char *)buf, amount, timeout);
+    }
+
+    if (me->io_suspended) {
+        PR_SetError(PR_INVALID_STATE_ERROR, 0);
+        return -1;
+    }
+
+    if (!fd->secret->md.io_model_committed) {
+        rv = _md_Associate((HANDLE)osfd);
+        PR_ASSERT(0 != rv);
+        fd->secret->md.io_model_committed = PR_TRUE;
+    }
+
+    memset(&(me->md.overlapped.overlapped), 0, sizeof(OVERLAPPED));
+	if (_native_threads_only)
+		me->md.overlapped.overlapped.hEvent = me->md.thr_event;
+
+    _PR_THREAD_LOCK(me);
+	if (_PR_PENDING_INTERRUPT(me)) {
+		me->flags &= ~_PR_INTERRUPT;
+		PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+    	_PR_THREAD_UNLOCK(me);
+		return -1;
+	}
+    me->io_pending = PR_TRUE;
+    me->state = _PR_IO_WAIT;
+    _PR_THREAD_UNLOCK(me);
+    me->io_fd = osfd;
+
+    rv = WriteFile((HANDLE)osfd,
+                   buf, 
+                   amount,
+                   &bytes,
+                   &(me->md.overlapped.overlapped));
+    if ( (rv == 0) && ((err = GetLastError()) != ERROR_IO_PENDING) ) {
+    	_PR_THREAD_LOCK(me);
+        me->io_pending = PR_FALSE;
+        me->state = _PR_RUNNING;
+		if (_PR_PENDING_INTERRUPT(me)) {
+			me->flags &= ~_PR_INTERRUPT;
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+			_PR_THREAD_UNLOCK(me);
+			return -1;
+		}
+		_PR_THREAD_UNLOCK(me);
+
+		_PR_MD_MAP_WRITE_ERROR(err);
+        return -1;
+    }
+
+    if (_native_threads_only && rv) {
+        _native_thread_io_nowait(me, rv, bytes);
+    } else if (_NT_IO_WAIT(me, timeout) == PR_FAILURE) {
+        PR_ASSERT(0);
+        return -1;
+    }
+
+    PR_ASSERT(me->io_pending == PR_FALSE || me->io_suspended == PR_TRUE);
+
+    if (me->io_suspended) {
+        if (_PR_PENDING_INTERRUPT(me)) {
+            me->flags &= ~_PR_INTERRUPT;
+            PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+        } else {
+            PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+        }
+        return -1;
+    }
+
+    if (me->md.blocked_io_status == 0) {
+		_PR_MD_MAP_WRITE_ERROR(me->md.blocked_io_error);
+        return -1;
+    }
+
+    PR_ASSERT(me->io_pending == PR_FALSE);
+
+    return me->md.blocked_io_bytes;
+}
+
+PRInt32
+_PR_MD_SENDTO(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+              const PRNetAddr *addr, PRUint32 addrlen, PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    PRInt32 rv;
+
+    if (!fd->secret->md.io_model_committed) {
+        rv = _md_MakeNonblock((HANDLE)osfd);
+        PR_ASSERT(0 != rv);
+        fd->secret->md.io_model_committed = PR_TRUE;
+    }
+    if (_NT_USE_NB_IO(fd))
+        return _nt_nonblock_sendto(fd, buf, amount, (struct sockaddr *)addr, addrlen, timeout);
+    else
+        return pt_SendTo(osfd, buf, amount, flags, addr, addrlen, timeout);
+}
+
+PRInt32
+_PR_MD_RECVFROM(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+                PRNetAddr *addr, PRUint32 *addrlen, PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    PRInt32 rv;
+
+    if (!fd->secret->md.io_model_committed) {
+        rv = _md_MakeNonblock((HANDLE)osfd);
+        PR_ASSERT(0 != rv);
+        fd->secret->md.io_model_committed = PR_TRUE;
+    }
+    if (_NT_USE_NB_IO(fd))
+        return _nt_nonblock_recvfrom(fd, buf, amount, (struct sockaddr *)addr, addrlen, timeout);
+    else
+        return pt_RecvFrom(osfd, buf, amount, flags, addr, addrlen, timeout);
+}
+
+/* XXXMB - for now this is a sockets call only */
+PRInt32
+_PR_MD_WRITEV(PRFileDesc *fd, const PRIOVec *iov, PRInt32 iov_size, PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    int index;
+    int sent = 0;
+    int rv;
+
+    if (_NT_USE_NB_IO(fd)) {
+        if (!fd->secret->md.io_model_committed) {
+            rv = _md_MakeNonblock((HANDLE)osfd);
+            PR_ASSERT(0 != rv);
+            fd->secret->md.io_model_committed = PR_TRUE;
+        }
+        return _nt_nonblock_writev(fd, iov, iov_size, timeout);
+    }
+
+    for (index=0; index<iov_size; index++) {
+        rv = _PR_MD_SEND(fd, iov[index].iov_base, iov[index].iov_len, 0,
+						timeout);
+        if (rv > 0) 
+            sent += rv;
+        if ( rv != iov[index].iov_len ) {
+            if (sent <= 0)
+                return -1;
+            return -1;
+        }
+    }
+
+    return sent;
+}
+
+PRInt32
+_PR_MD_LISTEN(PRFileDesc *fd, PRIntn backlog)
+{
+    PRInt32 rv;
+
+    rv = listen(fd->secret->md.osfd, backlog);
+	if (rv < 0)
+		_PR_MD_MAP_LISTEN_ERROR(WSAGetLastError());
+	return(rv);
+}
+
+PRInt32
+_PR_MD_SHUTDOWN(PRFileDesc *fd, PRIntn how)
+{
+    PRInt32 rv;
+
+    rv = shutdown(fd->secret->md.osfd, how);
+	if (rv < 0)
+		_PR_MD_MAP_SHUTDOWN_ERROR(WSAGetLastError());
+	return(rv);
+}
+
+PRStatus
+_PR_MD_GETSOCKNAME(PRFileDesc *fd, PRNetAddr *addr, PRUint32 *len)
+{
+    PRInt32 rv;
+
+    rv = getsockname((SOCKET)fd->secret->md.osfd, (struct sockaddr *)addr, len);
+    if (rv==0)
+		return PR_SUCCESS;
+	else {
+		_PR_MD_MAP_GETSOCKNAME_ERROR(WSAGetLastError());
+		return PR_FAILURE;
+	}
+}
+
+PRStatus
+_PR_MD_GETPEERNAME(PRFileDesc *fd, PRNetAddr *addr, PRUint32 *len)
+{
+    PRInt32 rv;
+
+    /*
+     * NT has a bug that, when invoked on a socket accepted by
+     * AcceptEx(), getpeername() returns an all-zero peer address.
+     * To work around this bug, we store the peer's address (returned
+     * by AcceptEx()) with the socket fd and use the cached peer
+     * address if the socket is an accepted socket.
+     */
+
+    if (fd->secret->md.accepted_socket) {
+        INT seconds;
+        INT bytes = sizeof(seconds);
+
+        /*
+         * Determine if the socket is connected.
+         */
+
+        rv = getsockopt(fd->secret->md.osfd, 
+                        SOL_SOCKET,
+                        SO_CONNECT_TIME,
+                        (char *) &seconds,
+                        (PINT) &bytes);
+        if (rv == NO_ERROR) {
+            if (seconds == 0xffffffff) {
+                PR_SetError(PR_NOT_CONNECTED_ERROR, 0);
+                return PR_FAILURE;
+            }
+            *len = PR_NETADDR_SIZE(&fd->secret->md.peer_addr);
+            memcpy(addr, &fd->secret->md.peer_addr, *len);
+            return PR_SUCCESS;
+        } else {
+            _PR_MD_MAP_GETSOCKOPT_ERROR(WSAGetLastError());
+            return PR_FAILURE;
+        }
+    } else { 
+        rv = getpeername((SOCKET)fd->secret->md.osfd,
+                         (struct sockaddr *) addr, len);
+        if (rv == 0) {
+            return PR_SUCCESS;
+        } else {
+            _PR_MD_MAP_GETPEERNAME_ERROR(WSAGetLastError());
+            return PR_FAILURE;
+        }
+    }
+}
+
+PRStatus
+_PR_MD_GETSOCKOPT(PRFileDesc *fd, PRInt32 level, PRInt32 optname, char* optval, PRInt32* optlen)
+{
+    PRInt32 rv;
+
+    rv = getsockopt((SOCKET)fd->secret->md.osfd, level, optname, optval, optlen);
+    if (rv==0)
+		return PR_SUCCESS;
+	else {
+		_PR_MD_MAP_GETSOCKOPT_ERROR(WSAGetLastError());
+		return PR_FAILURE;
+	}
+}
+
+PRStatus
+_PR_MD_SETSOCKOPT(PRFileDesc *fd, PRInt32 level, PRInt32 optname, const char* optval, PRInt32 optlen)
+{
+    PRInt32 rv;
+
+    rv = setsockopt((SOCKET)fd->secret->md.osfd, level, optname, optval, optlen);
+    if (rv==0)
+		return PR_SUCCESS;
+	else {
+		_PR_MD_MAP_SETSOCKOPT_ERROR(WSAGetLastError());
+		return PR_FAILURE;
+	}
+}
+
+/* --- FILE IO ----------------------------------------------------------- */
+
+PROsfd
+_PR_MD_OPEN(const char *name, PRIntn osflags, PRIntn mode)
+{
+    HANDLE file;
+    PRInt32 access = 0;
+    PRInt32 flags = 0;
+    PRInt32 flag6 = 0;
+    
+    if (osflags & PR_SYNC) flag6 = FILE_FLAG_WRITE_THROUGH;
+ 
+    if (osflags & PR_RDONLY || osflags & PR_RDWR) access |= GENERIC_READ;
+    if (osflags & PR_WRONLY || osflags & PR_RDWR) access |= GENERIC_WRITE;
+
+    if ( osflags & PR_CREATE_FILE && osflags & PR_EXCL )
+        flags = CREATE_NEW;
+    else if (osflags & PR_CREATE_FILE)
+        flags = (0 != (osflags & PR_TRUNCATE)) ? CREATE_ALWAYS : OPEN_ALWAYS;
+    else if (osflags & PR_TRUNCATE) flags = TRUNCATE_EXISTING;
+    else flags = OPEN_EXISTING;
+
+
+    flag6 |= FILE_FLAG_OVERLAPPED;
+
+    file = CreateFile(name, 
+                      access, 
+                      FILE_SHARE_READ|FILE_SHARE_WRITE,
+                      NULL,
+                      flags, 
+                      flag6,
+                      NULL);
+    if (file == INVALID_HANDLE_VALUE) {
+        _PR_MD_MAP_OPEN_ERROR(GetLastError());
+        return -1;
+    }
+
+    if (osflags & PR_APPEND) {
+        if ( SetFilePointer(file, 0, 0, FILE_END) == 0xFFFFFFFF ) {
+            _PR_MD_MAP_LSEEK_ERROR(GetLastError());
+            CloseHandle(file);
+            return -1;
+        }
+    }
+
+    return (PROsfd)file;
+}
+
+PROsfd
+_PR_MD_OPEN_FILE(const char *name, PRIntn osflags, PRIntn mode)
+{
+    HANDLE file;
+    PRInt32 access = 0;
+    PRInt32 flags = 0;
+    PRInt32 flag6 = 0;
+    SECURITY_ATTRIBUTES sa;
+    LPSECURITY_ATTRIBUTES lpSA = NULL;
+    PSECURITY_DESCRIPTOR pSD = NULL;
+    PACL pACL = NULL;
+
+    if (osflags & PR_SYNC) flag6 = FILE_FLAG_WRITE_THROUGH;
+ 
+    if (osflags & PR_RDONLY || osflags & PR_RDWR) access |= GENERIC_READ;
+    if (osflags & PR_WRONLY || osflags & PR_RDWR) access |= GENERIC_WRITE;
+
+    if ( osflags & PR_CREATE_FILE && osflags & PR_EXCL )
+        flags = CREATE_NEW;
+    else if (osflags & PR_CREATE_FILE)
+        flags = (0 != (osflags & PR_TRUNCATE)) ? CREATE_ALWAYS : OPEN_ALWAYS;
+    else if (osflags & PR_TRUNCATE) flags = TRUNCATE_EXISTING;
+    else flags = OPEN_EXISTING;
+
+
+    flag6 |= FILE_FLAG_OVERLAPPED;
+
+    if (osflags & PR_CREATE_FILE) {
+        if (_PR_NT_MakeSecurityDescriptorACL(mode, fileAccessTable,
+                &pSD, &pACL) == PR_SUCCESS) {
+            sa.nLength = sizeof(sa);
+            sa.lpSecurityDescriptor = pSD;
+            sa.bInheritHandle = FALSE;
+            lpSA = &sa;
+        }
+    }
+    file = CreateFile(name, 
+                      access, 
+                      FILE_SHARE_READ|FILE_SHARE_WRITE,
+                      lpSA,
+                      flags, 
+                      flag6,
+                      NULL);
+    if (lpSA != NULL) {
+        _PR_NT_FreeSecurityDescriptorACL(pSD, pACL);
+    }
+    if (file == INVALID_HANDLE_VALUE) {
+        _PR_MD_MAP_OPEN_ERROR(GetLastError());
+        return -1;
+    }
+
+    if (osflags & PR_APPEND) {
+        if ( SetFilePointer(file, 0, 0, FILE_END) == 0xFFFFFFFF ) {
+            _PR_MD_MAP_LSEEK_ERROR(GetLastError());
+            CloseHandle(file);
+            return -1;
+        }
+    }
+
+    return (PROsfd)file;
+}
+
+PRInt32 
+_PR_MD_READ(PRFileDesc *fd, void *buf, PRInt32 len)
+{
+    PROsfd f = fd->secret->md.osfd;
+    PRUint32 bytes;
+    int rv, err;
+    LONG hiOffset = 0;
+    LONG loOffset;
+
+    if (!fd->secret->md.sync_file_io) {
+        PRThread *me = _PR_MD_CURRENT_THREAD();
+
+        if (me->io_suspended) {
+            PR_SetError(PR_INVALID_STATE_ERROR, 0);
+            return -1;
+        }
+
+        memset(&(me->md.overlapped.overlapped), 0, sizeof(OVERLAPPED));
+
+        me->md.overlapped.overlapped.Offset = SetFilePointer((HANDLE)f, 0, &me->md.overlapped.overlapped.OffsetHigh, FILE_CURRENT);
+        PR_ASSERT((me->md.overlapped.overlapped.Offset != 0xffffffff) || (GetLastError() == NO_ERROR));
+
+        if (fd->secret->inheritable == _PR_TRI_TRUE) {
+            rv = ReadFile((HANDLE)f, 
+                          (LPVOID)buf, 
+                          len, 
+                          &bytes, 
+                          &me->md.overlapped.overlapped);
+            if (rv != 0) {
+                loOffset = SetFilePointer((HANDLE)f, bytes, &hiOffset, FILE_CURRENT);
+                PR_ASSERT((loOffset != 0xffffffff) || (GetLastError() == NO_ERROR));
+                return bytes;
+            }
+            err = GetLastError();
+            if (err == ERROR_IO_PENDING) {
+                rv = GetOverlappedResult((HANDLE)f,
+                        &me->md.overlapped.overlapped, &bytes, TRUE);
+                if (rv != 0) {
+                    loOffset = SetFilePointer((HANDLE)f, bytes, &hiOffset, FILE_CURRENT);
+                    PR_ASSERT((loOffset != 0xffffffff) || (GetLastError() == NO_ERROR));
+                    return bytes;
+                }
+                err = GetLastError();
+            }
+            if (err == ERROR_HANDLE_EOF) {
+                return 0;
+            } else {
+                _PR_MD_MAP_READ_ERROR(err);
+                return -1;
+            }
+        } else {
+            if (!fd->secret->md.io_model_committed) {
+                rv = _md_Associate((HANDLE)f);
+                PR_ASSERT(rv != 0);
+                fd->secret->md.io_model_committed = PR_TRUE;
+            }
+
+			if (_native_threads_only)
+        		me->md.overlapped.overlapped.hEvent = me->md.thr_event;
+
+			_PR_THREAD_LOCK(me);
+			if (_PR_PENDING_INTERRUPT(me)) {
+				me->flags &= ~_PR_INTERRUPT;
+				PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+				_PR_THREAD_UNLOCK(me);
+				return -1;
+			}
+			me->io_pending = PR_TRUE;
+			me->state = _PR_IO_WAIT;
+			_PR_THREAD_UNLOCK(me);
+			me->io_fd = f;
+
+            rv = ReadFile((HANDLE)f, 
+                          (LPVOID)buf, 
+                          len, 
+                          &bytes, 
+                          &me->md.overlapped.overlapped);
+            if ( (rv == 0) && ((err = GetLastError()) != ERROR_IO_PENDING) ) {
+				_PR_THREAD_LOCK(me);
+				me->io_pending = PR_FALSE;
+				me->state = _PR_RUNNING;
+				if (_PR_PENDING_INTERRUPT(me)) {
+					me->flags &= ~_PR_INTERRUPT;
+					PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+					_PR_THREAD_UNLOCK(me);
+					return -1;
+				}
+				_PR_THREAD_UNLOCK(me);
+
+                if (err == ERROR_HANDLE_EOF) {
+                    return 0;
+                }
+                _PR_MD_MAP_READ_ERROR(err);
+                return -1;
+            }
+
+            if (_native_threads_only && rv) {
+                _native_thread_io_nowait(me, rv, bytes);
+            } else if (_NT_IO_WAIT(me, PR_INTERVAL_NO_TIMEOUT) == PR_FAILURE) {
+                PR_ASSERT(0);
+                return -1;
+            }
+
+            PR_ASSERT(me->io_pending == PR_FALSE || me->io_suspended == PR_TRUE);
+
+            if (me->io_suspended) {
+                if (_PR_PENDING_INTERRUPT(me)) {
+                    me->flags &= ~_PR_INTERRUPT;
+                    PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+                } else {
+                    PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+                }
+                return -1;
+            }
+
+            if (me->md.blocked_io_status == 0) {
+                if (me->md.blocked_io_error == ERROR_HANDLE_EOF) {
+                    return 0;
+                }
+                _PR_MD_MAP_READ_ERROR(me->md.blocked_io_error);
+                return -1;
+            }
+
+            SetFilePointer((HANDLE)f, me->md.blocked_io_bytes, 0, FILE_CURRENT);
+    
+            PR_ASSERT(me->io_pending == PR_FALSE);
+
+            return me->md.blocked_io_bytes;
+        }
+    } else {
+
+        rv = ReadFile((HANDLE)f,
+                      (LPVOID)buf,
+                      len,
+                      &bytes,
+                      NULL);
+        if (rv == 0) {
+            err = GetLastError();
+            /* ERROR_HANDLE_EOF can only be returned by async io */
+            PR_ASSERT(err != ERROR_HANDLE_EOF);
+            if (err == ERROR_BROKEN_PIPE) {
+                /* The write end of the pipe has been closed. */ 
+                return 0;
+            }
+            _PR_MD_MAP_READ_ERROR(err);
+            return -1;
+        }
+        return bytes;
+    }
+}
+
+PRInt32
+_PR_MD_WRITE(PRFileDesc *fd, const void *buf, PRInt32 len)
+{
+    PROsfd f = fd->secret->md.osfd;
+    PRInt32 bytes;
+    int rv, err;
+    LONG hiOffset = 0;
+    LONG loOffset;
+    LARGE_INTEGER offset; /* use for the calculation of the new offset */
+
+    if (!fd->secret->md.sync_file_io) {
+        PRThread *me = _PR_MD_CURRENT_THREAD();
+
+        if (me->io_suspended) {
+            PR_SetError(PR_INVALID_STATE_ERROR, 0);
+            return -1;
+        }
+
+        memset(&(me->md.overlapped.overlapped), 0, sizeof(OVERLAPPED));
+
+        me->md.overlapped.overlapped.Offset = SetFilePointer((HANDLE)f, 0, &me->md.overlapped.overlapped.OffsetHigh, FILE_CURRENT);
+        PR_ASSERT((me->md.overlapped.overlapped.Offset != 0xffffffff) || (GetLastError() == NO_ERROR));
+
+        if (fd->secret->inheritable == _PR_TRI_TRUE) {
+            rv = WriteFile((HANDLE)f, 
+                          (LPVOID)buf, 
+                          len, 
+                          &bytes, 
+                          &me->md.overlapped.overlapped);
+            if (rv != 0) {
+                loOffset = SetFilePointer((HANDLE)f, bytes, &hiOffset, FILE_CURRENT);
+                PR_ASSERT((loOffset != 0xffffffff) || (GetLastError() == NO_ERROR));
+                return bytes;
+            }
+            err = GetLastError();
+            if (err == ERROR_IO_PENDING) {
+                rv = GetOverlappedResult((HANDLE)f,
+                        &me->md.overlapped.overlapped, &bytes, TRUE);
+                if (rv != 0) {
+                    loOffset = SetFilePointer((HANDLE)f, bytes, &hiOffset, FILE_CURRENT);
+                    PR_ASSERT((loOffset != 0xffffffff) || (GetLastError() == NO_ERROR));
+                    return bytes;
+                }
+                err = GetLastError();
+            }
+            _PR_MD_MAP_READ_ERROR(err);
+            return -1;
+        } else {
+            if (!fd->secret->md.io_model_committed) {
+                rv = _md_Associate((HANDLE)f);
+                PR_ASSERT(rv != 0);
+                fd->secret->md.io_model_committed = PR_TRUE;
+            }
+			if (_native_threads_only)
+        		me->md.overlapped.overlapped.hEvent = me->md.thr_event;
+
+			_PR_THREAD_LOCK(me);
+			if (_PR_PENDING_INTERRUPT(me)) {
+				me->flags &= ~_PR_INTERRUPT;
+				PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+				_PR_THREAD_UNLOCK(me);
+				return -1;
+			}
+			me->io_pending = PR_TRUE;
+			me->state = _PR_IO_WAIT;
+			_PR_THREAD_UNLOCK(me);
+			me->io_fd = f;
+
+            rv = WriteFile((HANDLE)f, 
+                           buf, 
+                           len, 
+                           &bytes, 
+                           &(me->md.overlapped.overlapped));
+            if ( (rv == 0) && ((err = GetLastError()) != ERROR_IO_PENDING) ) {
+				_PR_THREAD_LOCK(me);
+				me->io_pending = PR_FALSE;
+				me->state = _PR_RUNNING;
+				if (_PR_PENDING_INTERRUPT(me)) {
+					me->flags &= ~_PR_INTERRUPT;
+					PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+					_PR_THREAD_UNLOCK(me);
+					return -1;
+				}
+				_PR_THREAD_UNLOCK(me);
+
+                _PR_MD_MAP_WRITE_ERROR(err);
+                return -1;
+            }
+
+            if (_native_threads_only && rv) {
+                _native_thread_io_nowait(me, rv, bytes);
+            } else if (_NT_IO_WAIT(me, PR_INTERVAL_NO_TIMEOUT) == PR_FAILURE) {
+                PR_ASSERT(0);
+                return -1;
+            }
+
+            PR_ASSERT(me->io_pending == PR_FALSE || me->io_suspended == PR_TRUE);
+
+            if (me->io_suspended) {
+                if (_PR_PENDING_INTERRUPT(me)) {
+                    me->flags &= ~_PR_INTERRUPT;
+                    PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+                } else {
+                    PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+                }
+                return -1;
+            }
+
+            if (me->md.blocked_io_status == 0) {
+                _PR_MD_MAP_WRITE_ERROR(me->md.blocked_io_error);
+                return -1;
+            }
+
+            /*
+             * Moving the file pointer by a relative offset (FILE_CURRENT)
+             * does not work with a file on a network drive exported by a
+             * Win2K system.  We still don't know why.  A workaround is to
+             * move the file pointer by an absolute offset (FILE_BEGIN).
+             * (Bugzilla bug 70765)
+             */
+            offset.LowPart = me->md.overlapped.overlapped.Offset;
+            offset.HighPart = me->md.overlapped.overlapped.OffsetHigh;
+            offset.QuadPart += me->md.blocked_io_bytes;
+
+            SetFilePointer((HANDLE)f, offset.LowPart, &offset.HighPart, FILE_BEGIN);
+    
+            PR_ASSERT(me->io_pending == PR_FALSE);
+
+            return me->md.blocked_io_bytes;
+        }
+    } else {
+        rv = WriteFile((HANDLE)f,
+                       buf,
+                       len,
+                       &bytes,
+                       NULL);
+        if (rv == 0) {
+            _PR_MD_MAP_WRITE_ERROR(GetLastError());
+            return -1;
+        }
+        return bytes;
+    }
+}
+
+PRInt32
+_PR_MD_SOCKETAVAILABLE(PRFileDesc *fd)
+{
+    PRInt32 result;
+
+    if (ioctlsocket(fd->secret->md.osfd, FIONREAD, &result) < 0) {
+		PR_SetError(PR_BAD_DESCRIPTOR_ERROR, WSAGetLastError());
+        return -1;
+    }
+    return result;
+}
+
+PRInt32
+_PR_MD_PIPEAVAILABLE(PRFileDesc *fd)
+{
+    if (NULL == fd)
+		PR_SetError(PR_BAD_DESCRIPTOR_ERROR, 0);
+	else
+		PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+    return -1;
+}
+
+PROffset32
+_PR_MD_LSEEK(PRFileDesc *fd, PROffset32 offset, PRSeekWhence whence)
+{
+    DWORD moveMethod;
+    PROffset32 rv;
+
+    switch (whence) {
+        case PR_SEEK_SET:
+            moveMethod = FILE_BEGIN;
+            break;
+        case PR_SEEK_CUR:
+            moveMethod = FILE_CURRENT;
+            break;
+        case PR_SEEK_END:
+            moveMethod = FILE_END;
+            break;
+        default:
+            PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+            return -1;
+    }
+
+    rv = SetFilePointer((HANDLE)fd->secret->md.osfd, offset, NULL, moveMethod);
+
+    /*
+     * If the lpDistanceToMoveHigh argument (third argument) is
+     * NULL, SetFilePointer returns 0xffffffff on failure.
+     */
+    if (-1 == rv) {
+        _PR_MD_MAP_LSEEK_ERROR(GetLastError());
+    }
+    return rv;
+}
+
+PROffset64
+_PR_MD_LSEEK64(PRFileDesc *fd, PROffset64 offset, PRSeekWhence whence)
+{
+    DWORD moveMethod;
+    LARGE_INTEGER li;
+    DWORD err;
+
+    switch (whence) {
+        case PR_SEEK_SET:
+            moveMethod = FILE_BEGIN;
+            break;
+        case PR_SEEK_CUR:
+            moveMethod = FILE_CURRENT;
+            break;
+        case PR_SEEK_END:
+            moveMethod = FILE_END;
+            break;
+        default:
+            PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+            return -1;
+    }
+
+    li.QuadPart = offset;
+    li.LowPart = SetFilePointer((HANDLE)fd->secret->md.osfd,
+            li.LowPart, &li.HighPart, moveMethod);
+
+    if (0xffffffff == li.LowPart && (err = GetLastError()) != NO_ERROR) {
+        _PR_MD_MAP_LSEEK_ERROR(err);
+        li.QuadPart = -1;
+    }
+    return li.QuadPart;
+}
+
+/*
+ * This is documented to succeed on read-only files, but Win32's
+ * FlushFileBuffers functions fails with "access denied" in such a
+ * case.  So we only signal an error if the error is *not* "access
+ * denied".
+ */
+PRInt32
+_PR_MD_FSYNC(PRFileDesc *fd)
+{
+    /*
+     * From the documentation:
+     *
+     *	   On Windows NT, the function FlushFileBuffers fails if hFile
+     *	   is a handle to console output. That is because console
+     *	   output is not buffered. The function returns FALSE, and
+     *	   GetLastError returns ERROR_INVALID_HANDLE.
+     *
+     * On the other hand, on Win95, it returns without error.  I cannot
+     * assume that 0, 1, and 2 are console, because if someone closes
+     * System.out and then opens a file, they might get file descriptor
+     * 1.  An error on *that* version of 1 should be reported, whereas
+     * an error on System.out (which was the original 1) should be
+     * ignored.  So I use isatty() to ensure that such an error was
+     * because of this, and if it was, I ignore the error.
+     */
+
+    BOOL ok = FlushFileBuffers((HANDLE)fd->secret->md.osfd);
+
+    if (!ok) {
+	DWORD err = GetLastError();
+
+	if (err != ERROR_ACCESS_DENIED) {	/* from winerror.h */
+			_PR_MD_MAP_FSYNC_ERROR(err);
+	    return -1;
+	}
+    }
+    return 0;
+}
+
+PRInt32
+_PR_MD_CLOSE(PROsfd osfd, PRBool socket)
+{
+    PRInt32 rv;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    if (socket)  {
+        rv = closesocket((SOCKET)osfd);
+        if (rv < 0)
+            _PR_MD_MAP_CLOSE_ERROR(WSAGetLastError());
+    } else {
+        rv = CloseHandle((HANDLE)osfd)?0:-1;
+        if (rv < 0)
+            _PR_MD_MAP_CLOSE_ERROR(GetLastError());
+    }
+
+    if (rv == 0 && me->io_suspended) {
+        if (me->io_fd == osfd) {
+            PRBool fWait;
+
+            _PR_THREAD_LOCK(me);
+            me->state = _PR_IO_WAIT;
+            /* The IO could have completed on another thread just after
+             * calling closesocket while the io_suspended flag was true.  
+             * So we now grab the lock to do a safe check on io_pending to
+             * see if we need to wait or not.
+             */
+            fWait = me->io_pending;
+            me->io_suspended = PR_FALSE;
+            me->md.interrupt_disabled = PR_TRUE;
+            _PR_THREAD_UNLOCK(me);
+
+            if (fWait)
+                _NT_IO_WAIT(me, PR_INTERVAL_NO_TIMEOUT);
+            PR_ASSERT(me->io_suspended ==  PR_FALSE);
+            PR_ASSERT(me->io_pending ==  PR_FALSE);
+            /*
+             * I/O operation is no longer pending; the thread can now
+             * run on any cpu
+             */
+            _PR_THREAD_LOCK(me);
+            me->md.interrupt_disabled = PR_FALSE;
+            me->md.thr_bound_cpu = NULL;
+            me->io_suspended = PR_FALSE;
+            me->io_pending = PR_FALSE;
+            me->state = _PR_RUNNING;
+            _PR_THREAD_UNLOCK(me);
+        }
+    }
+    return rv;
+}
+
+PRStatus
+_PR_MD_SET_FD_INHERITABLE(PRFileDesc *fd, PRBool inheritable)
+{
+    BOOL rv;
+
+    if (fd->secret->md.io_model_committed) {
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+        return PR_FAILURE;
+    }
+    rv = SetHandleInformation(
+            (HANDLE)fd->secret->md.osfd,
+            HANDLE_FLAG_INHERIT,
+            inheritable ? HANDLE_FLAG_INHERIT : 0);
+    if (0 == rv) {
+        _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+} 
+
+void
+_PR_MD_INIT_FD_INHERITABLE(PRFileDesc *fd, PRBool imported)
+{
+    if (imported) {
+        fd->secret->inheritable = _PR_TRI_UNKNOWN;
+    } else {
+        fd->secret->inheritable = _PR_TRI_FALSE;
+    }
+}
+
+void
+_PR_MD_QUERY_FD_INHERITABLE(PRFileDesc *fd)
+{
+    DWORD flags;
+
+    PR_ASSERT(_PR_TRI_UNKNOWN == fd->secret->inheritable);
+    if (fd->secret->md.io_model_committed) {
+        return;
+    }
+    if (GetHandleInformation((HANDLE)fd->secret->md.osfd, &flags)) {
+        if (flags & HANDLE_FLAG_INHERIT) {
+            fd->secret->inheritable = _PR_TRI_TRUE;
+        } else {
+            fd->secret->inheritable = _PR_TRI_FALSE;
+        }
+    }
+}
+
+
+/* --- DIR IO ------------------------------------------------------------ */
+#define GetFileFromDIR(d)       (d)->d_entry.cFileName
+#define FileIsHidden(d)       ((d)->d_entry.dwFileAttributes & FILE_ATTRIBUTE_HIDDEN)
+
+void FlipSlashes(char *cp, int len)
+{
+    while (--len >= 0) {
+        if (cp[0] == '/') {
+            cp[0] = PR_DIRECTORY_SEPARATOR;
+        }
+        cp = _mbsinc(cp);
+    }
+} /* end FlipSlashes() */
+
+/*
+**
+** Local implementations of standard Unix RTL functions which are not provided
+** by the VC RTL.
+**
+*/
+
+PRInt32
+_PR_MD_CLOSE_DIR(_MDDir *d)
+{
+    if ( d ) {
+        if (FindClose( d->d_hdl )) {
+            d->magic = (PRUint32)-1;
+            return 0;
+        } else {
+            _PR_MD_MAP_CLOSEDIR_ERROR(GetLastError());
+            return -1;
+        }
+    }
+    PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+    return -1;
+}
+
+
+PRStatus
+_PR_MD_OPEN_DIR(_MDDir *d, const char *name)
+{
+    char filename[ MAX_PATH ];
+    int len;
+
+    len = strlen(name);
+    /* Need 5 bytes for \*.* and the trailing null byte. */
+    if (len + 5 > MAX_PATH) {
+        PR_SetError(PR_NAME_TOO_LONG_ERROR, 0);
+        return PR_FAILURE;
+    }
+    strcpy(filename, name);
+
+    /*
+     * If 'name' ends in a slash or backslash, do not append
+     * another backslash.
+     */
+    if (IsPrevCharSlash(filename, filename + len)) {
+        len--;
+    }
+    strcpy(&filename[len], "\\*.*");
+    FlipSlashes( filename, strlen(filename) );
+
+    d->d_hdl = FindFirstFile( filename, &(d->d_entry) );
+    if ( d->d_hdl == INVALID_HANDLE_VALUE ) {
+		_PR_MD_MAP_OPENDIR_ERROR(GetLastError());
+        return PR_FAILURE;
+    }
+    d->firstEntry = PR_TRUE;
+    d->magic = _MD_MAGIC_DIR;
+    return PR_SUCCESS;
+}
+
+char *
+_PR_MD_READ_DIR(_MDDir *d, PRIntn flags)
+{
+    PRInt32 err;
+    BOOL rv;
+    char *fileName;
+
+    if ( d ) {
+        while (1) {
+            if (d->firstEntry) {
+                d->firstEntry = PR_FALSE;
+                rv = 1;
+            } else {
+                rv = FindNextFile(d->d_hdl, &(d->d_entry));
+            }
+            if (rv == 0) {
+                break;
+            }
+            fileName = GetFileFromDIR(d);
+            if ( (flags & PR_SKIP_DOT) &&
+                 (fileName[0] == '.') && (fileName[1] == '\0'))
+                 continue;
+            if ( (flags & PR_SKIP_DOT_DOT) &&
+                 (fileName[0] == '.') && (fileName[1] == '.') &&
+                 (fileName[2] == '\0'))
+                 continue;
+            if ( (flags & PR_SKIP_HIDDEN) && FileIsHidden(d))
+                 continue;
+            return fileName;
+        }
+	err = GetLastError();
+	PR_ASSERT(NO_ERROR != err);
+			_PR_MD_MAP_READDIR_ERROR(err);
+	return NULL;
+		}
+    PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+    return NULL;
+}
+
+PRInt32
+_PR_MD_DELETE(const char *name)
+{
+    if (DeleteFile(name)) {
+		return 0;
+	} else {
+		_PR_MD_MAP_DELETE_ERROR(GetLastError());
+		return -1;
+	}
+}
+
+void
+_PR_FileTimeToPRTime(const FILETIME *filetime, PRTime *prtm)
+{
+    PR_ASSERT(sizeof(FILETIME) == sizeof(PRTime));
+    CopyMemory(prtm, filetime, sizeof(PRTime));
+#ifdef __GNUC__
+    *prtm = (*prtm - _pr_filetime_offset) / 10LL;
+#else
+    *prtm = (*prtm - _pr_filetime_offset) / 10i64;
+#endif
+
+#ifdef DEBUG
+    /* Doublecheck our calculation. */
+    {
+        SYSTEMTIME systime;
+        PRExplodedTime etm;
+        PRTime cmp; /* for comparison */
+        BOOL rv;
+
+        rv = FileTimeToSystemTime(filetime, &systime);
+        PR_ASSERT(0 != rv);
+
+        /*
+         * PR_ImplodeTime ignores wday and yday.
+         */
+        etm.tm_usec = systime.wMilliseconds * PR_USEC_PER_MSEC;
+        etm.tm_sec = systime.wSecond;
+        etm.tm_min = systime.wMinute;
+        etm.tm_hour = systime.wHour;
+        etm.tm_mday = systime.wDay;
+        etm.tm_month = systime.wMonth - 1;
+        etm.tm_year = systime.wYear;
+        /*
+         * It is not well-documented what time zone the FILETIME's
+         * are in.  WIN32_FIND_DATA is documented to be in UTC (GMT).
+         * But BY_HANDLE_FILE_INFORMATION is unclear about this.
+         * By our best judgement, we assume that FILETIME is in UTC.
+         */
+        etm.tm_params.tp_gmt_offset = 0;
+        etm.tm_params.tp_dst_offset = 0;
+        cmp = PR_ImplodeTime(&etm);
+
+        /*
+         * SYSTEMTIME is in milliseconds precision, so we convert PRTime's
+         * microseconds to milliseconds before doing the comparison.
+         */
+        PR_ASSERT((cmp / PR_USEC_PER_MSEC) == (*prtm / PR_USEC_PER_MSEC));
+    }
+#endif /* DEBUG */
+}
+
+PRInt32
+_PR_MD_STAT(const char *fn, struct stat *info)
+{
+    PRInt32 rv;
+
+    rv = _stat(fn, (struct _stat *)info);
+    if (-1 == rv) {
+        /*
+         * Check for MSVC runtime library _stat() bug.
+         * (It's really a bug in FindFirstFile().)
+         * If a pathname ends in a backslash or slash,
+         * e.g., c:\temp\ or c:/temp/, _stat() will fail.
+         * Note: a pathname ending in a slash (e.g., c:/temp/)
+         * can be handled by _stat() on NT but not on Win95.
+         *
+         * We remove the backslash or slash at the end and
+         * try again.
+         */
+
+        int len = strlen(fn);
+        if (len > 0 && len <= _MAX_PATH
+                && IsPrevCharSlash(fn, fn + len)) {
+            char newfn[_MAX_PATH + 1];
+
+            strcpy(newfn, fn);
+            newfn[len - 1] = '\0';
+            rv = _stat(newfn, (struct _stat *)info);
+        }
+    }
+
+    if (-1 == rv) {
+        _PR_MD_MAP_STAT_ERROR(errno);
+    }
+    return rv;
+}
+
+#define _PR_IS_SLASH(ch) ((ch) == '/' || (ch) == '\\')
+
+static PRBool
+IsPrevCharSlash(const char *str, const char *current)
+{
+    const char *prev;
+
+    if (str >= current)
+        return PR_FALSE;
+    prev = _mbsdec(str, current);
+    return (prev == current - 1) && _PR_IS_SLASH(*prev);
+}
+
+/*
+ * IsRootDirectory --
+ *
+ * Return PR_TRUE if the pathname 'fn' is a valid root directory,
+ * else return PR_FALSE.  The char buffer pointed to by 'fn' must
+ * be writable.  During the execution of this function, the contents
+ * of the buffer pointed to by 'fn' may be modified, but on return
+ * the original contents will be restored.  'buflen' is the size of
+ * the buffer pointed to by 'fn'.
+ *
+ * Root directories come in three formats:
+ * 1. / or \, meaning the root directory of the current drive.
+ * 2. C:/ or C:\, where C is a drive letter.
+ * 3. \\<server name>\<share point name>\ or
+ *    \\<server name>\<share point name>, meaning the root directory
+ *    of a UNC (Universal Naming Convention) name.
+ */
+
+static PRBool
+IsRootDirectory(char *fn, size_t buflen)
+{
+    char *p;
+    PRBool slashAdded = PR_FALSE;
+    PRBool rv = PR_FALSE;
+
+    if (_PR_IS_SLASH(fn[0]) && fn[1] == '\0') {
+        return PR_TRUE;
+    }
+
+    if (isalpha(fn[0]) && fn[1] == ':' && _PR_IS_SLASH(fn[2])
+            && fn[3] == '\0') {
+        rv = GetDriveType(fn) > 1 ? PR_TRUE : PR_FALSE;
+        return rv;
+    }
+
+    /* The UNC root directory */
+
+    if (_PR_IS_SLASH(fn[0]) && _PR_IS_SLASH(fn[1])) {
+        /* The 'server' part should have at least one character. */
+        p = &fn[2];
+        if (*p == '\0' || _PR_IS_SLASH(*p)) {
+            return PR_FALSE;
+        }
+
+        /* look for the next slash */
+        do {
+            p = _mbsinc(p);
+        } while (*p != '\0' && !_PR_IS_SLASH(*p));
+        if (*p == '\0') {
+            return PR_FALSE;
+        }
+
+        /* The 'share' part should have at least one character. */
+        p++;
+        if (*p == '\0' || _PR_IS_SLASH(*p)) {
+            return PR_FALSE;
+        }
+
+        /* look for the final slash */
+        do {
+            p = _mbsinc(p);
+        } while (*p != '\0' && !_PR_IS_SLASH(*p));
+        if (_PR_IS_SLASH(*p) && p[1] != '\0') {
+            return PR_FALSE;
+        }
+        if (*p == '\0') {
+            /*
+             * GetDriveType() doesn't work correctly if the
+             * path is of the form \\server\share, so we add
+             * a final slash temporarily.
+             */
+            if ((p + 1) < (fn + buflen)) {
+                *p++ = '\\';
+                *p = '\0';
+                slashAdded = PR_TRUE;
+            } else {
+                return PR_FALSE; /* name too long */
+            }
+        }
+        rv = GetDriveType(fn) > 1 ? PR_TRUE : PR_FALSE;
+        /* restore the 'fn' buffer */
+        if (slashAdded) {
+            *--p = '\0';
+        }
+    }
+    return rv;
+}
+
+PRInt32
+_PR_MD_GETFILEINFO64(const char *fn, PRFileInfo64 *info)
+{
+    WIN32_FILE_ATTRIBUTE_DATA findFileData;
+    
+    if (NULL == fn || '\0' == *fn) {
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+        return -1;
+    }
+
+    if (!GetFileAttributesEx(fn, GetFileExInfoStandard, &findFileData)) {
+        _PR_MD_MAP_OPENDIR_ERROR(GetLastError());
+        return -1;
+    }
+
+    if (findFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
+        info->type = PR_FILE_DIRECTORY;
+    } else {
+        info->type = PR_FILE_FILE;
+    }
+
+    info->size = findFileData.nFileSizeHigh;
+    info->size = (info->size << 32) + findFileData.nFileSizeLow;
+
+    _PR_FileTimeToPRTime(&findFileData.ftLastWriteTime, &info->modifyTime);
+
+    if (0 == findFileData.ftCreationTime.dwLowDateTime &&
+            0 == findFileData.ftCreationTime.dwHighDateTime) {
+        info->creationTime = info->modifyTime;
+    } else {
+        _PR_FileTimeToPRTime(&findFileData.ftCreationTime,
+                &info->creationTime);
+    }
+
+    return 0;
+}
+
+PRInt32
+_PR_MD_GETFILEINFO(const char *fn, PRFileInfo *info)
+{
+    PRFileInfo64 info64;
+    PRInt32 rv = _PR_MD_GETFILEINFO64(fn, &info64);
+    if (0 == rv)
+    {
+        info->type = info64.type;
+        info->size = (PRUint32) info64.size;
+        info->modifyTime = info64.modifyTime;
+        info->creationTime = info64.creationTime;
+    }
+    return rv;
+}
+
+PRInt32
+_PR_MD_GETOPENFILEINFO64(const PRFileDesc *fd, PRFileInfo64 *info)
+{
+    int rv;
+
+    BY_HANDLE_FILE_INFORMATION hinfo;
+
+    rv = GetFileInformationByHandle((HANDLE)fd->secret->md.osfd, &hinfo);
+    if (rv == FALSE) {
+		_PR_MD_MAP_FSTAT_ERROR(GetLastError());
+        return -1;
+	}
+
+    if (hinfo.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+        info->type = PR_FILE_DIRECTORY;
+    else
+        info->type = PR_FILE_FILE;
+
+    info->size = hinfo.nFileSizeHigh;
+    info->size = (info->size << 32) + hinfo.nFileSizeLow;
+
+    _PR_FileTimeToPRTime(&hinfo.ftLastWriteTime, &(info->modifyTime) );
+    _PR_FileTimeToPRTime(&hinfo.ftCreationTime, &(info->creationTime) );
+
+    return 0;
+}
+
+PRInt32
+_PR_MD_GETOPENFILEINFO(const PRFileDesc *fd, PRFileInfo *info)
+{
+    int rv;
+
+    BY_HANDLE_FILE_INFORMATION hinfo;
+
+    rv = GetFileInformationByHandle((HANDLE)fd->secret->md.osfd, &hinfo);
+    if (rv == FALSE) {
+		_PR_MD_MAP_FSTAT_ERROR(GetLastError());
+        return -1;
+	}
+
+    if (hinfo.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+        info->type = PR_FILE_DIRECTORY;
+    else
+        info->type = PR_FILE_FILE;
+
+    info->size = hinfo.nFileSizeLow;
+
+    _PR_FileTimeToPRTime(&hinfo.ftLastWriteTime, &(info->modifyTime) );
+    _PR_FileTimeToPRTime(&hinfo.ftCreationTime, &(info->creationTime) );
+
+    return 0;
+}
+
+PRInt32
+_PR_MD_RENAME(const char *from, const char *to)
+{
+    /* Does this work with dot-relative pathnames? */
+    if (MoveFile(from, to)) {
+		return 0;
+	} else {
+		_PR_MD_MAP_RENAME_ERROR(GetLastError());
+		return -1;
+	}
+}
+
+PRInt32
+_PR_MD_ACCESS(const char *name, PRAccessHow how)
+{
+    PRInt32 rv;
+
+    switch (how) {
+      case PR_ACCESS_WRITE_OK:
+        rv = _access(name, 02);
+		break;
+      case PR_ACCESS_READ_OK:
+        rv = _access(name, 04);
+		break;
+      case PR_ACCESS_EXISTS:
+        rv = _access(name, 00);
+		break;
+      default:
+		PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+		return -1;
+    }
+	if (rv < 0) {
+		_PR_MD_MAP_ACCESS_ERROR(errno);
+    }
+    return rv;
+}
+
+PRInt32
+_PR_MD_MKDIR(const char *name, PRIntn mode)
+{
+    /* XXXMB - how to translate the "mode"??? */
+    if (CreateDirectory(name, NULL)) {
+        return 0;
+    } else {
+        _PR_MD_MAP_MKDIR_ERROR(GetLastError());
+        return -1;
+    }
+}
+
+PRInt32
+_PR_MD_MAKE_DIR(const char *name, PRIntn mode)
+{
+    BOOL rv;
+    SECURITY_ATTRIBUTES sa;
+    LPSECURITY_ATTRIBUTES lpSA = NULL;
+    PSECURITY_DESCRIPTOR pSD = NULL;
+    PACL pACL = NULL;
+
+    if (_PR_NT_MakeSecurityDescriptorACL(mode, dirAccessTable,
+            &pSD, &pACL) == PR_SUCCESS) {
+        sa.nLength = sizeof(sa);
+        sa.lpSecurityDescriptor = pSD;
+        sa.bInheritHandle = FALSE;
+        lpSA = &sa;
+    }
+    rv = CreateDirectory(name, lpSA);
+    if (lpSA != NULL) {
+        _PR_NT_FreeSecurityDescriptorACL(pSD, pACL);
+    }
+    if (rv) {
+        return 0;
+    } else {
+        _PR_MD_MAP_MKDIR_ERROR(GetLastError());
+        return -1;
+    }
+}
+
+PRInt32
+_PR_MD_RMDIR(const char *name)
+{
+    if (RemoveDirectory(name)) {
+        return 0;
+    } else {
+        _PR_MD_MAP_RMDIR_ERROR(GetLastError());
+        return -1;
+    }
+}
+
+PRStatus
+_PR_MD_LOCKFILE(PROsfd f)
+{
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    if (me->io_suspended) {
+        PR_SetError(PR_INVALID_STATE_ERROR, 0);
+        return PR_FAILURE;
+    }
+
+    memset(&(me->md.overlapped.overlapped), 0, sizeof(OVERLAPPED));
+
+    _PR_THREAD_LOCK(me);
+	if (_PR_PENDING_INTERRUPT(me)) {
+		me->flags &= ~_PR_INTERRUPT;
+		PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+    	_PR_THREAD_UNLOCK(me);
+		return -1;
+	}
+    me->io_pending = PR_TRUE;
+    me->state = _PR_IO_WAIT;
+    _PR_THREAD_UNLOCK(me);
+
+    rv = LockFileEx((HANDLE)f, 
+                    LOCKFILE_EXCLUSIVE_LOCK,
+                    0,
+                    0x7fffffff,
+                    0,
+                    &me->md.overlapped.overlapped);
+
+    if (_native_threads_only) {
+		_PR_THREAD_LOCK(me);
+		me->io_pending = PR_FALSE;
+		me->state = _PR_RUNNING;
+		if (_PR_PENDING_INTERRUPT(me)) {
+			me->flags &= ~_PR_INTERRUPT;
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+			_PR_THREAD_UNLOCK(me);
+			return PR_FAILURE;
+		}
+		_PR_THREAD_UNLOCK(me);
+
+        if (rv == FALSE) {
+            err = GetLastError();
+            PR_ASSERT(err != ERROR_IO_PENDING);
+            _PR_MD_MAP_LOCKF_ERROR(err);
+            return PR_FAILURE;
+        }
+        return PR_SUCCESS;
+    }
+
+    /* HACK AROUND NT BUG
+     * NT 3.51 has a bug.  In NT 3.51, if LockFileEx returns true, you
+     * don't get any completion on the completion port.  This is a bug.
+     *
+     * They fixed it on NT4.0 so that you do get a completion.
+     *
+     * If we pretend we won't get a completion, NSPR gets confused later
+     * when the unexpected completion arrives.  If we assume we do get
+     * a completion, we hang on 3.51.  Worse, Microsoft informs me that the 
+     * behavior varies on 3.51 depending on if you are using a network
+     * file system or a local disk!
+     *
+     * Solution:  For now, _nt_version_gets_lockfile_completion is set
+     * depending on whether or not this system is EITHER
+     *      - running NT 4.0
+     *      - running NT 3.51 with a service pack greater than 5.
+     * 
+     * In the meantime, this code may not work on network file systems.
+     *
+     */
+
+    if ( rv == FALSE && ((err = GetLastError()) != ERROR_IO_PENDING)) {
+		_PR_THREAD_LOCK(me);
+		me->io_pending = PR_FALSE;
+		me->state = _PR_RUNNING;
+		if (_PR_PENDING_INTERRUPT(me)) {
+			me->flags &= ~_PR_INTERRUPT;
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+			_PR_THREAD_UNLOCK(me);
+			return PR_FAILURE;
+		}
+		_PR_THREAD_UNLOCK(me);
+
+		_PR_MD_MAP_LOCKF_ERROR(err);
+        return PR_FAILURE;
+    }
+#ifdef _NEED_351_FILE_LOCKING_HACK
+    else if (rv)  {
+        /* If this is NT 3.51 and the file is local, then we won't get a 
+         * completion back from LockFile when it succeeded.
+         */
+        if (_nt_version_gets_lockfile_completion == PR_FALSE) {
+            if ( IsFileLocal((HANDLE)f) == _PR_LOCAL_FILE) {
+                me->io_pending = PR_FALSE;
+                me->state = _PR_RUNNING;
+                return PR_SUCCESS; 
+            }
+        }
+    }
+#endif /* _NEED_351_FILE_LOCKING_HACK */
+
+    if (_NT_IO_WAIT(me, PR_INTERVAL_NO_TIMEOUT) == PR_FAILURE) {
+		_PR_THREAD_LOCK(me);
+        me->io_pending = PR_FALSE;
+        me->state = _PR_RUNNING;
+		_PR_THREAD_UNLOCK(me);
+        return PR_FAILURE;
+    }
+
+    if (me->md.blocked_io_status == 0) {
+		_PR_MD_MAP_LOCKF_ERROR(me->md.blocked_io_error);
+        return PR_FAILURE;
+    }
+
+    return PR_SUCCESS;
+}
+
+PRStatus
+_PR_MD_TLOCKFILE(PROsfd f)
+{
+    PRInt32 rv, err;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    if (me->io_suspended) {
+        PR_SetError(PR_INVALID_STATE_ERROR, 0);
+        return PR_FAILURE;
+    }
+
+    memset(&(me->md.overlapped.overlapped), 0, sizeof(OVERLAPPED));
+
+    _PR_THREAD_LOCK(me);
+	if (_PR_PENDING_INTERRUPT(me)) {
+		me->flags &= ~_PR_INTERRUPT;
+		PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+    	_PR_THREAD_UNLOCK(me);
+		return -1;
+	}
+    me->io_pending = PR_TRUE;
+    me->state = _PR_IO_WAIT;
+    _PR_THREAD_UNLOCK(me);
+
+    rv = LockFileEx((HANDLE)f, 
+                    LOCKFILE_FAIL_IMMEDIATELY|LOCKFILE_EXCLUSIVE_LOCK,
+                    0,
+                    0x7fffffff,
+                    0,
+                    &me->md.overlapped.overlapped);
+    if (_native_threads_only) {
+		_PR_THREAD_LOCK(me);
+		me->io_pending = PR_FALSE;
+		me->state = _PR_RUNNING;
+		if (_PR_PENDING_INTERRUPT(me)) {
+			me->flags &= ~_PR_INTERRUPT;
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+			_PR_THREAD_UNLOCK(me);
+			return PR_FAILURE;
+		}
+		_PR_THREAD_UNLOCK(me);
+
+        if (rv == FALSE) {
+            err = GetLastError();
+            PR_ASSERT(err != ERROR_IO_PENDING);
+            _PR_MD_MAP_LOCKF_ERROR(err);
+            return PR_FAILURE;
+        }
+        return PR_SUCCESS;
+    }
+    if ( rv == FALSE && ((err = GetLastError()) != ERROR_IO_PENDING)) {
+		_PR_THREAD_LOCK(me);
+		me->io_pending = PR_FALSE;
+		me->state = _PR_RUNNING;
+		if (_PR_PENDING_INTERRUPT(me)) {
+			me->flags &= ~_PR_INTERRUPT;
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+			_PR_THREAD_UNLOCK(me);
+			return PR_FAILURE;
+		}
+		_PR_THREAD_UNLOCK(me);
+
+        _PR_MD_MAP_LOCKF_ERROR(err);
+        return PR_FAILURE;
+    }
+#ifdef _NEED_351_FILE_LOCKING_HACK
+    else if (rv)  {
+        /* If this is NT 3.51 and the file is local, then we won't get a 
+         * completion back from LockFile when it succeeded.
+         */
+        if (_nt_version_gets_lockfile_completion == PR_FALSE) {
+            if ( IsFileLocal((HANDLE)f) == _PR_LOCAL_FILE) {
+				_PR_THREAD_LOCK(me);
+				me->io_pending = PR_FALSE;
+				me->state = _PR_RUNNING;
+				if (_PR_PENDING_INTERRUPT(me)) {
+					me->flags &= ~_PR_INTERRUPT;
+					PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+					_PR_THREAD_UNLOCK(me);
+					return PR_FAILURE;
+				}
+				_PR_THREAD_UNLOCK(me);
+
+                return PR_SUCCESS; 
+            }
+        }
+    }
+#endif /* _NEED_351_FILE_LOCKING_HACK */
+
+    if (_NT_IO_WAIT(me, PR_INTERVAL_NO_TIMEOUT) == PR_FAILURE) {
+		_PR_THREAD_LOCK(me);
+		me->io_pending = PR_FALSE;
+		me->state = _PR_RUNNING;
+		if (_PR_PENDING_INTERRUPT(me)) {
+			me->flags &= ~_PR_INTERRUPT;
+			PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+			_PR_THREAD_UNLOCK(me);
+			return PR_FAILURE;
+		}
+		_PR_THREAD_UNLOCK(me);
+
+        return PR_FAILURE;
+    }
+
+    if (me->md.blocked_io_status == 0) {
+		_PR_MD_MAP_LOCKF_ERROR(me->md.blocked_io_error);
+        return PR_FAILURE;
+    }
+
+    return PR_SUCCESS;
+}
+
+
+PRStatus
+_PR_MD_UNLOCKFILE(PROsfd f)
+{
+    PRInt32 rv;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    if (me->io_suspended) {
+        PR_SetError(PR_INVALID_STATE_ERROR, 0);
+        return PR_FAILURE;
+    }
+
+    memset(&(me->md.overlapped.overlapped), 0, sizeof(OVERLAPPED));
+
+    rv = UnlockFileEx((HANDLE)f,
+                      0,
+                      0x7fffffff,
+                      0,
+                      &me->md.overlapped.overlapped);
+
+    if (rv)
+        return PR_SUCCESS;
+    else {
+        int err = GetLastError();
+		_PR_MD_MAP_LOCKF_ERROR(err);
+        return PR_FAILURE;
+    }
+}
+
+void
+_PR_MD_MAKE_NONBLOCK(PRFileDesc *f)
+{
+    /*
+     * On NT, we either call _md_Associate() or _md_MakeNonblock(),
+     * depending on whether the socket is blocking or not.
+     *
+     * Once we associate a socket with the io completion port,
+     * there is no way to disassociate it from the io completion
+     * port.  So we have to call _md_Associate/_md_MakeNonblock
+     * lazily.
+     */
+}
+
+#ifdef _NEED_351_FILE_LOCKING_HACK
+/***************
+** 
+** Lockfile hacks
+**
+** The following code is a hack to work around a microsoft bug with lockfile.
+** The problem is that on NT 3.51, if LockFileEx() succeeds, you never
+** get a completion back for files that are on local disks.  So, we need to
+** know if a file is local or remote so we can tell if we should expect 
+** a completion.
+**
+** The only way to check if a file is local or remote based on the handle is
+** to get the serial number for the volume it is mounted on and then to 
+** compare that with mounted drives.  This code caches the volume numbers of
+** fixed disks and does a relatively quick check.
+**
+** Locking:  Since the only thing we ever do when multithreaded is a 32bit
+**           assignment, we probably don't need locking.  It is included just
+**           case anyway.
+**
+** Limitations:  Does not work on floppies because they are too slow
+**               Unknown if it will work on wierdo 3rd party file systems
+**
+****************
+*/
+
+/* There can only be 26 drive letters on NT */
+#define _PR_MAX_DRIVES 26
+
+_MDLock cachedVolumeLock;
+DWORD dwCachedVolumeSerialNumbers[_PR_MAX_DRIVES] = {0};
+DWORD dwLastCachedDrive = 0;
+DWORD dwRemoveableDrivesToCheck = 0; /* bitmask for removeable drives */
+
+PRBool IsFileLocalInit()
+{
+   TCHAR lpBuffer[_PR_MAX_DRIVES*5];
+   DWORD nBufferLength = _PR_MAX_DRIVES*5;
+   DWORD nBufferNeeded = GetLogicalDriveStrings(0, NULL);
+   DWORD dwIndex = 0;
+   DWORD dwDriveType;
+   DWORD dwVolumeSerialNumber;
+   DWORD dwDriveIndex = 0;
+   DWORD oldmode = (DWORD) -1;
+
+   _MD_NEW_LOCK(&cachedVolumeLock);
+
+   nBufferNeeded = GetLogicalDriveStrings(nBufferLength, lpBuffer);
+   if (nBufferNeeded == 0 || nBufferNeeded > nBufferLength)
+      return PR_FALSE;
+
+   // Calling GetVolumeInformation on a removeable drive where the
+   // disk is currently removed will cause a dialog box to the
+   // console.  This is not good.
+   // Temporarily disable the SEM_FAILCRITICALERRORS to avoid the
+   // damn dialog.
+
+   dwCachedVolumeSerialNumbers[dwDriveIndex] = 0;
+   oldmode = SetErrorMode(SEM_FAILCRITICALERRORS);
+
+   // now loop through the logical drives
+   while(lpBuffer[dwIndex] != TEXT('\0'))
+   {
+      // skip the floppy drives.  This is *SLOW*
+      if ((lpBuffer[dwIndex] == TEXT('A')) || (lpBuffer[dwIndex] == TEXT('B')))
+         /* Skip over floppies */;
+      else
+      {
+         dwDriveIndex = (lpBuffer[dwIndex] - TEXT('A'));
+
+         dwDriveType = GetDriveType(&lpBuffer[dwIndex]);
+
+         switch(dwDriveType)
+         {
+               // Ignore these drive types
+            case 0:
+            case 1:
+            case DRIVE_REMOTE:
+            default: // If the drive type is unknown, ignore it.
+               break;
+
+               // Removable media drives can have different serial numbers
+               // at different times, so cache the current serial number
+               // but keep track of them so they can be rechecked if necessary.
+            case DRIVE_REMOVABLE:
+
+               // CDROM is a removable media
+            case DRIVE_CDROM: 
+
+               // no idea if ramdisks can change serial numbers or not
+               // but it doesn't hurt to treat them as removable.
+              
+            case DRIVE_RAMDISK: 
+
+
+               // Here is where we keep track of removable drives.
+               dwRemoveableDrivesToCheck |= 1 << dwDriveIndex;
+
+               // removable drives fall through to fixed drives and get cached.
+
+            case DRIVE_FIXED:
+
+               // cache volume serial numbers. 
+               if (GetVolumeInformation(
+                   &lpBuffer[dwIndex],
+                   NULL, 0,
+                   &dwVolumeSerialNumber,
+                   NULL, NULL, NULL, 0)
+                  )
+                  {
+                     if (dwLastCachedDrive < dwDriveIndex)
+                        dwLastCachedDrive = dwDriveIndex;
+                     dwCachedVolumeSerialNumbers[dwDriveIndex] = dwVolumeSerialNumber;
+                  }
+ 
+               break;
+         }
+      }
+
+      dwIndex += lstrlen(&lpBuffer[dwIndex]) +1;
+   }
+
+   if (oldmode != (DWORD) -1) {
+       SetErrorMode(oldmode);
+       oldmode = (DWORD) -1;
+   }
+
+   return PR_TRUE;
+}
+
+PRInt32 IsFileLocal(HANDLE hFile)
+{
+   DWORD dwIndex = 0, dwMask;
+   BY_HANDLE_FILE_INFORMATION Info;
+   TCHAR szDrive[4] = TEXT("C:\\");
+   DWORD dwVolumeSerialNumber;
+   DWORD oldmode = (DWORD) -1;
+   int rv = _PR_REMOTE_FILE;
+
+   if (!GetFileInformationByHandle(hFile, &Info))
+      return -1;
+
+   // look to see if the volume serial number has been cached.
+   _MD_LOCK(&cachedVolumeLock);
+   while(dwIndex <= dwLastCachedDrive)
+      if (dwCachedVolumeSerialNumbers[dwIndex++] == Info.dwVolumeSerialNumber)
+      {
+         _MD_UNLOCK(&cachedVolumeLock);
+         return _PR_LOCAL_FILE;
+      }
+   _MD_UNLOCK(&cachedVolumeLock);
+
+   // volume serial number not found in the cache.  Check removable files.
+   // removable drives are noted as a bitmask.  If the bit associated with 
+   // a specific drive is set, then we should query its volume serial number
+   // as its possible it has changed.
+   dwMask = dwRemoveableDrivesToCheck;
+   dwIndex = 0;
+
+   while(dwMask)
+   {
+      while(!(dwMask & 1))
+      {
+         dwIndex++;
+         dwMask = dwMask >> 1;
+      }
+
+      szDrive[0] = TEXT('A')+ (TCHAR) dwIndex;
+
+      // Calling GetVolumeInformation on a removeable drive where the
+      // disk is currently removed will cause a dialog box to the
+      // console.  This is not good.
+      // Temporarily disable the SEM_FAILCRITICALERRORS to avoid the
+      // dialog.
+
+      oldmode = SetErrorMode(SEM_FAILCRITICALERRORS);
+
+      if (GetVolumeInformation(
+                  szDrive,
+                  NULL, 0,
+                  &dwVolumeSerialNumber,
+                  NULL, NULL, NULL, 0)
+         )
+      {
+         if (dwVolumeSerialNumber == Info.dwVolumeSerialNumber)
+         {
+            _MD_LOCK(&cachedVolumeLock);
+            if (dwLastCachedDrive < dwIndex)
+               dwLastCachedDrive = dwIndex;
+            dwCachedVolumeSerialNumbers[dwIndex] = dwVolumeSerialNumber;
+            _MD_UNLOCK(&cachedVolumeLock);
+            rv = _PR_LOCAL_FILE;
+         }
+      }
+      if (oldmode != (DWORD) -1) {
+          SetErrorMode(oldmode);
+          oldmode = (DWORD) -1;
+      }
+
+      if (rv == _PR_LOCAL_FILE)
+          return _PR_LOCAL_FILE;
+
+      dwIndex++;
+      dwMask = dwMask >> 1;
+   }
+
+   return _PR_REMOTE_FILE;
+}
+#endif /* _NEED_351_FILE_LOCKING_HACK */
+
+PR_IMPLEMENT(PRStatus) PR_NT_CancelIo(PRFileDesc *fd)
+{
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+	PRBool fWait;
+	PRFileDesc *bottom;
+
+	bottom = PR_GetIdentitiesLayer(fd, PR_NSPR_IO_LAYER);
+    if (!me->io_suspended || (NULL == bottom) ||
+					(me->io_fd != bottom->secret->md.osfd)) {
+        PR_SetError(PR_INVALID_STATE_ERROR, 0);
+        return PR_FAILURE;
+    }
+	/*
+	 * The CancelIO operation has to be issued by the same NT thread that
+	 * issued the I/O operation
+	 */
+	PR_ASSERT(_PR_IS_NATIVE_THREAD(me) || (me->cpu == me->md.thr_bound_cpu));
+	if (me->io_pending) {
+		if (!CancelIo((HANDLE)bottom->secret->md.osfd)) {
+			PR_SetError(PR_INVALID_STATE_ERROR, GetLastError());
+			return PR_FAILURE;
+		}
+	}
+	_PR_THREAD_LOCK(me);
+	fWait = me->io_pending;
+	me->io_suspended = PR_FALSE;
+	me->state = _PR_IO_WAIT;
+	me->md.interrupt_disabled = PR_TRUE;
+	_PR_THREAD_UNLOCK(me);
+	if (fWait)
+		_NT_IO_WAIT(me, PR_INTERVAL_NO_TIMEOUT);
+	PR_ASSERT(me->io_suspended ==  PR_FALSE);
+	PR_ASSERT(me->io_pending ==  PR_FALSE);
+
+	_PR_THREAD_LOCK(me);
+	me->md.interrupt_disabled = PR_FALSE;
+	me->md.thr_bound_cpu = NULL;
+    me->io_suspended = PR_FALSE;
+    me->io_pending = PR_FALSE;
+	me->state = _PR_RUNNING;
+	_PR_THREAD_UNLOCK(me);
+	return PR_SUCCESS;
+}
+
+static PROsfd _nt_nonblock_accept(PRFileDesc *fd, struct sockaddr *addr, int *addrlen, PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    SOCKET sock;
+    PRInt32 rv, err;
+    fd_set rd;
+    struct timeval tv, *tvp;
+
+    FD_ZERO(&rd);
+    FD_SET((SOCKET)osfd, &rd);
+    if (timeout == PR_INTERVAL_NO_TIMEOUT) {
+        while ((sock = accept(osfd, addr, addrlen)) == -1) {
+            if (((err = WSAGetLastError()) == WSAEWOULDBLOCK)
+                    && (!fd->secret->nonblocking)) {
+                if ((rv = _PR_NTFiberSafeSelect(0, &rd, NULL, NULL,
+                        NULL)) == -1) {
+                    _PR_MD_MAP_SELECT_ERROR(WSAGetLastError());
+                    break;
+                }
+            } else {
+                _PR_MD_MAP_ACCEPT_ERROR(err);
+                break;
+            }
+        }
+    } else if (timeout == PR_INTERVAL_NO_WAIT) {
+        if ((sock = accept(osfd, addr, addrlen)) == -1) {
+            if (((err = WSAGetLastError()) == WSAEWOULDBLOCK)
+                    && (!fd->secret->nonblocking)) {
+                PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+            } else {
+                _PR_MD_MAP_ACCEPT_ERROR(err);
+            }
+        }
+    } else {
+retry:
+        if ((sock = accept(osfd, addr, addrlen)) == -1) {
+            if (((err = WSAGetLastError()) == WSAEWOULDBLOCK)
+                    && (!fd->secret->nonblocking)) {
+                tv.tv_sec = PR_IntervalToSeconds(timeout);
+                tv.tv_usec = PR_IntervalToMicroseconds(
+                    timeout - PR_SecondsToInterval(tv.tv_sec));
+                tvp = &tv;
+
+                rv = _PR_NTFiberSafeSelect(0, &rd, NULL, NULL, tvp);
+                if (rv > 0) {
+                    goto retry;
+                } else if (rv == 0) {
+                    PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+                } else {
+                    _PR_MD_MAP_SELECT_ERROR(WSAGetLastError());
+                }
+            } else {
+                _PR_MD_MAP_ACCEPT_ERROR(err);
+            }
+        }
+    }
+    return (PROsfd)sock;
+}
+
+static PRInt32 _nt_nonblock_connect(PRFileDesc *fd, struct sockaddr *addr, int addrlen, PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    PRInt32 rv;
+    int err;
+    fd_set wr, ex;
+    struct timeval tv, *tvp;
+    int len;
+
+    if ((rv = connect(osfd, addr, addrlen)) == -1) {
+        if ((err = WSAGetLastError()) == WSAEWOULDBLOCK) {
+            if ( timeout == PR_INTERVAL_NO_TIMEOUT ) {
+                tvp = NULL;
+            } else {
+                tv.tv_sec = PR_IntervalToSeconds(timeout);
+                tv.tv_usec = PR_IntervalToMicroseconds(
+                    timeout - PR_SecondsToInterval(tv.tv_sec));
+                tvp = &tv;
+            }
+            FD_ZERO(&wr);
+            FD_ZERO(&ex);
+            FD_SET((SOCKET)osfd, &wr);
+            FD_SET((SOCKET)osfd, &ex);
+            if ((rv = _PR_NTFiberSafeSelect(0, NULL, &wr, &ex,
+                    tvp)) == -1) {
+                _PR_MD_MAP_SELECT_ERROR(WSAGetLastError());
+                return rv;
+            }
+            if (rv == 0) {
+                PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+                return -1;
+            }
+            /* Call Sleep(0) to work around a Winsock timeing bug. */
+            Sleep(0);
+            if (FD_ISSET((SOCKET)osfd, &ex)) {
+                len = sizeof(err);
+                if (getsockopt(osfd, SOL_SOCKET, SO_ERROR,
+                        (char *) &err, &len) == SOCKET_ERROR) {
+                    _PR_MD_MAP_GETSOCKOPT_ERROR(WSAGetLastError());
+                    return -1;
+                }
+                _PR_MD_MAP_CONNECT_ERROR(err);
+                return -1;
+            } 
+            PR_ASSERT(FD_ISSET((SOCKET)osfd, &wr));
+            rv = 0;
+        } else {
+            _PR_MD_MAP_CONNECT_ERROR(err);
+        }
+    }
+    return rv;
+}
+
+static PRInt32 _nt_nonblock_recv(PRFileDesc *fd, char *buf, int len, int flags, PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    struct timeval tv, *tvp;
+    fd_set rd;
+    int osflags;
+
+    if (0 == flags) {
+        osflags = 0;
+    } else {
+        PR_ASSERT(PR_MSG_PEEK == flags);
+        osflags = MSG_PEEK;
+    }
+    while ((rv = recv(osfd,buf,len,osflags)) == -1) {
+        if (((err = WSAGetLastError()) == WSAEWOULDBLOCK)
+                && (!fd->secret->nonblocking)) {
+            FD_ZERO(&rd);
+            FD_SET((SOCKET)osfd, &rd);
+            if (timeout == PR_INTERVAL_NO_TIMEOUT) {
+                tvp = NULL;
+            } else {
+                tv.tv_sec = PR_IntervalToSeconds(timeout);
+                tv.tv_usec = PR_IntervalToMicroseconds(
+                timeout - PR_SecondsToInterval(tv.tv_sec));
+                tvp = &tv;
+            }
+            if ((rv = _PR_NTFiberSafeSelect(0, &rd, NULL, NULL,
+                    tvp)) == -1) {
+                _PR_MD_MAP_SELECT_ERROR(WSAGetLastError());
+                break;
+            } else if (rv == 0) {
+                PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+                rv = -1;
+                break;
+            }
+        } else {
+            _PR_MD_MAP_RECV_ERROR(err);
+            break;
+        }
+    }
+    return(rv);
+}
+
+static PRInt32 _nt_nonblock_send(PRFileDesc *fd, char *buf, int len, PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    struct timeval tv, *tvp;
+    fd_set wd;
+    PRInt32 bytesSent = 0;
+
+    while(bytesSent < len) {
+        while ((rv = send(osfd,buf,len,0)) == -1) {
+            if (((err = WSAGetLastError()) == WSAEWOULDBLOCK)
+                    && (!fd->secret->nonblocking)) {
+                if ( timeout == PR_INTERVAL_NO_TIMEOUT ) {
+                    tvp = NULL;
+                } else {
+                    tv.tv_sec = PR_IntervalToSeconds(timeout);
+                    tv.tv_usec = PR_IntervalToMicroseconds(
+                        timeout - PR_SecondsToInterval(tv.tv_sec));
+                    tvp = &tv;
+                }
+                FD_ZERO(&wd);
+                FD_SET((SOCKET)osfd, &wd);
+                if ((rv = _PR_NTFiberSafeSelect(0, NULL, &wd, NULL,
+                        tvp)) == -1) {
+                    _PR_MD_MAP_SELECT_ERROR(WSAGetLastError());
+                    return -1;
+                }
+                if (rv == 0) {
+                    PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+                    return -1;
+                }
+            } else {
+                _PR_MD_MAP_SEND_ERROR(err);
+                return -1;
+            }
+        }
+        bytesSent += rv;
+        if (fd->secret->nonblocking) {
+            break;
+        }
+        if (bytesSent < len) {
+            if ( timeout == PR_INTERVAL_NO_TIMEOUT ) {
+                tvp = NULL;
+            } else {
+                tv.tv_sec = PR_IntervalToSeconds(timeout);
+                tv.tv_usec = PR_IntervalToMicroseconds(
+                    timeout - PR_SecondsToInterval(tv.tv_sec));
+                tvp = &tv;
+            }
+            FD_ZERO(&wd);
+            FD_SET((SOCKET)osfd, &wd);
+            if ((rv = _PR_NTFiberSafeSelect(0, NULL, &wd, NULL,
+                    tvp)) == -1) {
+                _PR_MD_MAP_SELECT_ERROR(WSAGetLastError());
+                return -1;
+            }
+            if (rv == 0) {
+                PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+                return -1;
+            }
+        }
+    }
+    return bytesSent;
+}
+
+static PRInt32 _nt_nonblock_writev(PRFileDesc *fd, const PRIOVec *iov, int size, PRIntervalTime timeout)
+{
+    int index;
+    int sent = 0;
+    int rv;
+
+    for (index=0; index<size; index++) {
+        rv = _nt_nonblock_send(fd, iov[index].iov_base, iov[index].iov_len, timeout);
+        if (rv > 0) 
+            sent += rv;
+        if ( rv != iov[index].iov_len ) {
+            if (rv < 0) {
+                if (fd->secret->nonblocking
+                        && (PR_GetError() == PR_WOULD_BLOCK_ERROR)
+                        && (sent > 0)) {
+                    return sent;
+                } else {
+                    return -1;
+                }
+            }
+            /* Only a nonblocking socket can have partial sends */
+            PR_ASSERT(fd->secret->nonblocking);
+            return sent;
+        }
+    }
+
+    return sent;
+}
+
+static PRInt32 _nt_nonblock_sendto(
+    PRFileDesc *fd, const char *buf, int len,
+    const struct sockaddr *addr, int addrlen, PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    struct timeval tv, *tvp;
+    fd_set wd;
+    PRInt32 bytesSent = 0;
+
+    while(bytesSent < len) {
+        while ((rv = sendto(osfd,buf,len,0, addr, addrlen)) == -1) {
+            if (((err = WSAGetLastError()) == WSAEWOULDBLOCK)
+                    && (!fd->secret->nonblocking)) {
+                if ( timeout == PR_INTERVAL_NO_TIMEOUT ) {
+                    tvp = NULL;
+                } else {
+                    tv.tv_sec = PR_IntervalToSeconds(timeout);
+                    tv.tv_usec = PR_IntervalToMicroseconds(
+                        timeout - PR_SecondsToInterval(tv.tv_sec));
+                    tvp = &tv;
+                }
+                FD_ZERO(&wd);
+                FD_SET((SOCKET)osfd, &wd);
+                if ((rv = _PR_NTFiberSafeSelect(0, NULL, &wd, NULL,
+                        tvp)) == -1) {
+                    _PR_MD_MAP_SELECT_ERROR(WSAGetLastError());
+                    return -1;
+                }
+                if (rv == 0) {
+                    PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+                    return -1;
+                }
+            } else {
+                _PR_MD_MAP_SENDTO_ERROR(err);
+                return -1;
+            }
+        }
+        bytesSent += rv;
+        if (fd->secret->nonblocking) {
+            break;
+        }
+        if (bytesSent < len) {
+            if ( timeout == PR_INTERVAL_NO_TIMEOUT ) {
+                tvp = NULL;
+            } else {
+                tv.tv_sec = PR_IntervalToSeconds(timeout);
+                tv.tv_usec = PR_IntervalToMicroseconds(
+                    timeout - PR_SecondsToInterval(tv.tv_sec));
+                tvp = &tv;
+            }
+            FD_ZERO(&wd);
+            FD_SET((SOCKET)osfd, &wd);
+            if ((rv = _PR_NTFiberSafeSelect(0, NULL, &wd, NULL,
+                    tvp)) == -1) {
+                _PR_MD_MAP_SELECT_ERROR(WSAGetLastError());
+                return -1;
+            }
+            if (rv == 0) {
+                PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+                return -1;
+            }
+        }
+    }
+    return bytesSent;
+}
+
+static PRInt32 _nt_nonblock_recvfrom(PRFileDesc *fd, char *buf, int len, struct sockaddr *addr, int *addrlen, PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    struct timeval tv, *tvp;
+    fd_set rd;
+
+    while ((rv = recvfrom(osfd,buf,len,0,addr, addrlen)) == -1) {
+        if (((err = WSAGetLastError()) == WSAEWOULDBLOCK)
+                && (!fd->secret->nonblocking)) {
+            if (timeout == PR_INTERVAL_NO_TIMEOUT) {
+                tvp = NULL;
+            } else {
+                tv.tv_sec = PR_IntervalToSeconds(timeout);
+                tv.tv_usec = PR_IntervalToMicroseconds(
+                timeout - PR_SecondsToInterval(tv.tv_sec));
+                tvp = &tv;
+            }
+            FD_ZERO(&rd);
+            FD_SET((SOCKET)osfd, &rd);
+            if ((rv = _PR_NTFiberSafeSelect(0, &rd, NULL, NULL,
+                    tvp)) == -1) {
+                _PR_MD_MAP_SELECT_ERROR(WSAGetLastError());
+                break;
+            } else if (rv == 0) {
+                PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+                rv = -1;
+                break;
+            }
+        } else {
+            _PR_MD_MAP_RECVFROM_ERROR(err);
+            break;
+        }
+    }
+    return(rv);
+}
+
+/*
+ * UDP support: the continuation thread functions and recvfrom and sendto.
+ */
+
+static void pt_InsertTimedInternal(pt_Continuation *op)
+{
+    PRInt32 delta = 0;
+    pt_Continuation *t_op = NULL;
+    PRIntervalTime now = PR_IntervalNow(), op_tmo, qd_tmo;
+
+    /*
+     * If this element operation isn't timed, it gets queued at the
+     * end of the list (just after pt_tq.tail) and we're
+     * finishd early.
+     */
+    if (PR_INTERVAL_NO_TIMEOUT == op->timeout)
+    {
+        t_op = pt_tq.tail;  /* put it at the end */
+        goto done;
+    }
+
+    /*
+     * The rest of this routine actaully deals with timed ops.
+     */
+
+    if (NULL != pt_tq.op)
+    {
+        /*
+         * To find where in the list to put the new operation, form
+         * the absolute time the operations in question will expire.
+         *
+         * The new operation ('op') will expire at now() + op->timeout.
+         *
+         * The operation that will time out furthest in the future will
+         * do so at pt_tq.epoch + pt_tq.op->timeout.
+         *
+         * Subsequently earlier timeouts are computed based on the latter
+         * knowledge by subracting the timeout deltas that are stored in
+         * the operation list. There are operation[n]->timeout ticks
+         * between the expiration of operation[n-1] and operation[n].e e 
+         *
+         * Therefore, the operation[n-1] will expire operation[n]->timeout
+         * ticks prior to operation[n].
+         *
+         * This should be easy!
+         */
+        t_op = pt_tq.op;  /* running pointer to queued op */
+        op_tmo = now + op->timeout;  /* that's in absolute ticks */
+        qd_tmo = pt_tq.epoch + t_op->timeout;  /* likewise */
+
+        do
+        {
+            /*
+             * If 'op' expires later than t_op, then insert 'op' just
+             * ahead of t_op. Otherwise, compute when operation[n-1]
+             * expires and try again.
+             *
+             * The actual different between the expiriation of 'op'
+             * and the current operation what becomes the new operaton's
+             * timeout interval. That interval is also subtracted from
+             * the interval of the operation immediately following where
+             * we stick 'op' (unless the next one isn't timed). The new
+             * timeout assigned to 'op' takes into account the values of
+             * now() and when the previous intervals were compured.
+             */
+            delta = op_tmo - qd_tmo;
+            if (delta >= 0)
+            {
+                op->timeout += (now - pt_tq.epoch);
+                goto done;
+            }
+
+            qd_tmo -= t_op->timeout;  /* previous operaton expiration */
+            t_op = t_op->prev;  /* point to previous operation */
+            if (NULL != t_op) qd_tmo += t_op->timeout;
+        } while (NULL != t_op);
+
+        /*
+         * If we got here we backed off the head of the list. That means that
+         * this timed entry has to go at the head of the list. This is just
+         * about like having an empty timer list.
+         */
+        delta = op->timeout;  /* $$$ is this right? */
+    }
+
+done:
+
+    /*
+     * Insert 'op' into the queue just after t_op or if t_op is null,
+     * at the head of the list.
+     *
+     * If t_op is NULL, the list is currently empty and this is pretty
+     * easy.
+     */
+    if (NULL == t_op)
+    {
+        op->prev = NULL;
+        op->next = pt_tq.head;
+        pt_tq.head = op;
+        if (NULL == pt_tq.tail) pt_tq.tail = op;
+        else op->next->prev = op;
+    }
+    else
+    {
+        op->prev = t_op;
+        op->next = t_op->next;
+        if (NULL != op->prev)
+            op->prev->next = op;
+        if (NULL != op->next)
+            op->next->prev = op;
+        if (t_op == pt_tq.tail)
+            pt_tq.tail = op;
+    }
+
+    /*
+     * Are we adjusting our epoch, etc? Are we replacing
+     * what was previously the element due to expire furthest
+     * out in the future? Is this even a timed operation?
+     */
+    if (PR_INTERVAL_NO_TIMEOUT != op->timeout)
+    {
+        if ((NULL == pt_tq.op)  /* we're the one and only */
+        || (t_op == pt_tq.op))  /* we're replacing */
+        {
+            pt_tq.op = op;
+            pt_tq.epoch = now;
+        }
+    }
+
+    pt_tq.op_count += 1;
+
+}  /* pt_InsertTimedInternal */
+
+/*
+ * function: pt_FinishTimed
+ *
+ * Takes the finished operation out of the timed queue. It
+ * notifies the initiating thread that the opertions is
+ * complete and returns to the caller the value of the next
+ * operation in the list (or NULL).
+ */
+static pt_Continuation *pt_FinishTimedInternal(pt_Continuation *op)
+{
+    pt_Continuation *next;
+
+    /* remove this one from the list */
+    if (NULL == op->prev) pt_tq.head = op->next;
+    else op->prev->next = op->next;
+    if (NULL == op->next) pt_tq.tail = op->prev;
+    else op->next->prev = op->prev;
+
+    /* did we happen to hit the timed op? */
+    if (op == pt_tq.op) pt_tq.op = op->prev;
+
+    next = op->next;
+    op->next = op->prev = NULL;
+    op->status = pt_continuation_done;
+
+    pt_tq.op_count -= 1;
+#if defined(DEBUG)
+    pt_debug.continuationsServed += 1;
+#endif
+    PR_NotifyCondVar(op->complete);
+
+    return next;
+}  /* pt_FinishTimedInternal */
+
+static void ContinuationThread(void *arg)
+{
+    /* initialization */
+    fd_set readSet, writeSet, exceptSet;
+    struct timeval tv;
+    SOCKET *pollingList = 0;                /* list built for polling */
+    PRIntn pollingListUsed;                 /* # entries used in the list */
+    PRIntn pollingListNeeded;               /* # entries needed this time */
+    PRIntn pollingSlotsAllocated = 0;       /* # entries available in list */
+    PRIntervalTime mx_select_ticks = PR_MillisecondsToInterval(PT_DEFAULT_SELECT_MSEC);
+
+    /* do some real work */
+    while (1)
+    {
+        PRIntn rv;
+        PRStatus status;
+        PRIntn pollIndex;
+        pt_Continuation *op;
+        PRIntervalTime now = PR_IntervalNow();
+        PRIntervalTime timeout = PR_INTERVAL_NO_TIMEOUT;
+
+        PR_Lock(pt_tq.ml);
+        while (NULL == pt_tq.head)
+        {
+            status = PR_WaitCondVar(pt_tq.new_op, PR_INTERVAL_NO_TIMEOUT);
+            if ((PR_FAILURE == status)
+                && (PR_PENDING_INTERRUPT_ERROR == PR_GetError())) break;
+        }
+        pollingListNeeded = pt_tq.op_count;
+        PR_Unlock(pt_tq.ml);
+
+        /* Okay. We're history */
+        if ((PR_FAILURE == status)
+            && (PR_PENDING_INTERRUPT_ERROR == PR_GetError())) break;
+
+	/*
+	 * We are not holding the pt_tq.ml lock now, so more items may
+	 * get added to pt_tq during this window of time.  We hope
+	 * that 10 more spaces in the polling list should be enough.
+	 */
+
+        FD_ZERO(&readSet);
+        FD_ZERO(&writeSet);
+        FD_ZERO(&exceptSet);
+        pollingListNeeded += 10;
+        if (pollingListNeeded > pollingSlotsAllocated)
+        {
+            if (NULL != pollingList) PR_DELETE(pollingList);
+            pollingList = PR_MALLOC(pollingListNeeded * sizeof(PRPollDesc));
+            PR_ASSERT(NULL != pollingList);
+            pollingSlotsAllocated = pollingListNeeded;
+        }
+
+#if defined(DEBUG)
+        if (pollingListNeeded > pt_debug.pollingListMax)
+            pt_debug.pollingListMax = pollingListUsed;
+#endif
+
+        /*
+         * Build up a polling list.
+         * This list is sorted on time. Operations that have been
+         * interrupted are completed and not included in the list.
+         * There is an assertion that the operation is in progress.
+         */
+        pollingListUsed = 0;
+        PR_Lock(pt_tq.ml);
+
+        for (op = pt_tq.head; NULL != op;)
+        {
+            if (pt_continuation_abort == op->status)
+            {
+                op->result.code = -1;
+                op->syserrno = WSAEINTR;
+                op = pt_FinishTimedInternal(op);
+            }
+            else
+            {
+                PR_ASSERT(pt_continuation_done != op->status);
+                op->status = pt_continuation_inprogress;
+                if (op->event & PR_POLL_READ) {
+                    FD_SET(op->arg1.osfd, &readSet);
+                }
+                if (op->event & PR_POLL_WRITE) {
+                    FD_SET(op->arg1.osfd, &writeSet);
+                }
+                if (op->event & PR_POLL_EXCEPT) {
+                    FD_SET(op->arg1.osfd, &exceptSet);
+                }
+                pollingList[pollingListUsed] = op->arg1.osfd;
+                pollingListUsed += 1;
+                if (pollingListUsed == pollingSlotsAllocated) break;
+                op = op->next;
+            }
+        }
+
+        PR_Unlock(pt_tq.ml);
+
+        /*
+         * If 'op' isn't NULL at this point, then we didn't get to
+         * the end of the list. That means that more items got added
+         * to the list than we anticipated. So, forget this iteration,
+         * go around the horn again.
+         * One would hope this doesn't happen all that often.
+         */
+        if (NULL != op)
+        {
+#if defined(DEBUG)
+            pt_debug.predictionsFoiled += 1;  /* keep track */
+#endif
+            continue;  /* make it rethink things */
+        }
+
+        /* there's a chance that all ops got blown away */
+        if (NULL == pt_tq.head) continue;
+        /* if not, we know this is the shortest timeout */
+        timeout = pt_tq.head->timeout;
+
+        /*
+         * We don't want to wait forever on this poll. So keep
+         * the interval down. The operations, if they are timed,
+         * still have to timeout, while those that are not timed
+         * should persist forever. But they may be aborted. That's
+         * what this anxiety is all about.
+         */
+        if (timeout > mx_select_ticks) timeout = mx_select_ticks;
+
+        if (PR_INTERVAL_NO_TIMEOUT != pt_tq.head->timeout)
+            pt_tq.head->timeout -= timeout;
+        tv.tv_sec = PR_IntervalToSeconds(timeout);
+        tv.tv_usec = PR_IntervalToMicroseconds(timeout) % PR_USEC_PER_SEC;
+
+        rv = select(0, &readSet, &writeSet, &exceptSet, &tv);
+
+        if (0 == rv)  /* poll timed out - what about leading op? */
+        {
+            if (0 == pt_tq.head->timeout)
+            {
+                /* 
+                 * The leading element of the timed queue has timed
+                 * out. Get rid of it. In any case go around the
+                 * loop again, computing the polling list, checking
+                 * for interrupted operations.
+                 */
+                PR_Lock(pt_tq.ml);
+                do
+                {
+                    pt_tq.head->result.code = -1;
+                    pt_tq.head->syserrno = WSAETIMEDOUT;
+                    op = pt_FinishTimedInternal(pt_tq.head);
+                } while ((NULL != op) && (0 == op->timeout));
+                PR_Unlock(pt_tq.ml);
+            }
+            continue;
+        }
+
+        if (-1 == rv && (WSAGetLastError() == WSAEINTR
+                || WSAGetLastError() == WSAEINPROGRESS))
+        {
+            continue;               /* go around the loop again */
+        }
+
+        /*
+         * select() says that something in our list is ready for some more
+         * action or is an invalid fd. Find it, load up the operation and
+         * see what happens.
+         */
+
+        PR_ASSERT(rv > 0 || WSAGetLastError() == WSAENOTSOCK);
+
+
+        /*
+         * $$$ There's a problem here. I'm running the operations list
+         * and I'm not holding any locks. I don't want to hold the lock
+         * and do the operation, so this is really messed up..
+         *
+         * This may work out okay. The rule is that only this thread,
+         * the continuation thread, can remove elements from the list.
+         * Therefore, the list is at worst, longer than when we built
+         * the polling list.
+         */
+        op = pt_tq.head;
+        for (pollIndex = 0; pollIndex < pollingListUsed; ++pollIndex)
+        {
+            PRInt16 revents = 0;
+
+            PR_ASSERT(NULL != op);
+
+            /*
+             * This one wants attention. Redo the operation.
+             * We know that there can only be more elements
+             * in the op list than we knew about when we created
+             * the poll list. Therefore, we might have to skip
+             * a few ops to find the right one to operation on.
+             */
+            while (pollingList[pollIndex] != op->arg1.osfd )
+            {
+                op = op->next;
+                PR_ASSERT(NULL != op);
+            }
+
+            if (FD_ISSET(op->arg1.osfd, &readSet)) {
+                revents |= PR_POLL_READ;
+            }
+            if (FD_ISSET(op->arg1.osfd, &writeSet)) {
+                revents |= PR_POLL_WRITE;
+            }
+            if (FD_ISSET(op->arg1.osfd, &exceptSet)) {
+                revents |= PR_POLL_EXCEPT;
+            }
+
+            /*
+             * Sip over all those not in progress. They'll be
+             * pruned next time we build a polling list. Call
+             * the continuation function. If it reports completion,
+             * finish off the operation.
+             */
+            if (revents && (pt_continuation_inprogress == op->status)
+                && (op->function(op, revents)))
+            {
+                PR_Lock(pt_tq.ml);
+                op = pt_FinishTimedInternal(op);
+                PR_Unlock(pt_tq.ml);
+            }
+        }
+    }
+    if (NULL != pollingList) PR_DELETE(pollingList);
+}  /* ContinuationThread */
+
+static int pt_Continue(pt_Continuation *op)
+{
+    PRStatus rv;
+    /* Finish filling in the blank slots */
+    op->status = pt_continuation_sumbitted;
+    op->complete = PR_NewCondVar(pt_tq.ml);
+
+    PR_Lock(pt_tq.ml);  /* we provide the locking */
+
+    pt_InsertTimedInternal(op);  /* insert in the structure */
+
+    PR_NotifyCondVar(pt_tq.new_op);  /* notify the continuation thread */
+
+    while (pt_continuation_done != op->status)  /* wait for completion */
+    {
+        rv = PR_WaitCondVar(op->complete, PR_INTERVAL_NO_TIMEOUT);
+        /*
+         * If we get interrupted, we set state the continuation thread will
+         * see and allow it to finish the I/O operation w/ error. That way
+         * the rule that only the continuation thread is removing elements
+         * from the list is still valid.
+         *
+         * Don't call interrupt on the continuation thread. That'll just
+         * piss him off. He's cycling around at least every mx_select_ticks
+         * anyhow and should notice the request in there.
+         */
+        if ((PR_FAILURE == rv)
+            && (PR_PENDING_INTERRUPT_ERROR == PR_GetError()))
+            op->status = pt_continuation_abort;  /* our status */
+    }
+
+    PR_Unlock(pt_tq.ml);  /* we provide the locking */
+
+    PR_DestroyCondVar(op->complete);
+
+    return op->result.code;  /* and the primary answer */
+}  /* pt_Continue */
+
+static PRBool pt_sendto_cont(pt_Continuation *op, PRInt16 revents)
+{
+    PRIntn bytes = sendto(
+        op->arg1.osfd, op->arg2.buffer, op->arg3.amount, op->arg4.flags,
+        (struct sockaddr*)op->arg5.addr, sizeof(*(op->arg5.addr)));
+    op->syserrno = WSAGetLastError();
+    if (bytes > 0)  /* this is progress */
+    {
+        char *bp = op->arg2.buffer;
+        bp += bytes;  /* adjust the buffer pointer */
+        op->arg2.buffer = bp;
+        op->result.code += bytes;  /* accumulate the number sent */
+        op->arg3.amount -= bytes;  /* and reduce the required count */
+        return (0 == op->arg3.amount) ? PR_TRUE : PR_FALSE;
+    }
+    else return ((-1 == bytes) && (WSAEWOULDBLOCK == op->syserrno)) ?
+	PR_FALSE : PR_TRUE;
+}  /* pt_sendto_cont */
+
+static PRBool pt_recvfrom_cont(pt_Continuation *op, PRInt16 revents)
+{
+    PRIntn addr_len = sizeof(*(op->arg5.addr));
+    op->result.code = recvfrom(
+        op->arg1.osfd, op->arg2.buffer, op->arg3.amount,
+        op->arg4.flags, (struct sockaddr*)op->arg5.addr, &addr_len);
+    op->syserrno = WSAGetLastError();
+    return ((-1 == op->result.code) && (WSAEWOULDBLOCK == op->syserrno)) ?
+        PR_FALSE : PR_TRUE;
+}  /* pt_recvfrom_cont */
+
+static PRInt32 pt_SendTo(
+    SOCKET osfd, const void *buf,
+    PRInt32 amount, PRInt32 flags, const PRNetAddr *addr,
+    PRIntn addrlen, PRIntervalTime timeout)
+{
+    PRInt32 bytes = -1, err;
+    PRBool fNeedContinue = PR_FALSE;
+
+    bytes = sendto(
+            osfd, buf, amount, flags,
+            (struct sockaddr*)addr, PR_NETADDR_SIZE(addr));
+    if (bytes == -1) {
+		if ((err = WSAGetLastError()) == WSAEWOULDBLOCK)
+        fNeedContinue = PR_TRUE;
+		else
+			_PR_MD_MAP_SENDTO_ERROR(err);
+    }
+    if (fNeedContinue == PR_TRUE)
+    {
+        pt_Continuation op;
+        op.arg1.osfd = osfd;
+        op.arg2.buffer = (void*)buf;
+        op.arg3.amount = amount;
+        op.arg4.flags = flags;
+        op.arg5.addr = (PRNetAddr*)addr;
+        op.timeout = timeout;
+        op.result.code = 0;  /* initialize the number sent */
+        op.function = pt_sendto_cont;
+        op.event = PR_POLL_WRITE | PR_POLL_EXCEPT;
+        bytes = pt_Continue(&op);
+        if (bytes < 0) {
+            WSASetLastError(op.syserrno);
+			_PR_MD_MAP_SENDTO_ERROR(op.syserrno);
+        }
+    }
+    return bytes;
+}  /* pt_SendTo */
+
+static PRInt32 pt_RecvFrom(SOCKET osfd, void *buf, PRInt32 amount,
+    PRInt32 flags, PRNetAddr *addr, PRIntn *addr_len, PRIntervalTime timeout)
+{
+    PRInt32 bytes = -1, err;
+    PRBool fNeedContinue = PR_FALSE;
+
+    bytes = recvfrom(
+            osfd, buf, amount, flags,
+            (struct sockaddr*)addr, addr_len);
+    if (bytes == -1) {
+		if ((err = WSAGetLastError()) == WSAEWOULDBLOCK)
+        fNeedContinue = PR_TRUE;
+		else
+			_PR_MD_MAP_RECVFROM_ERROR(err);
+    }
+
+    if (fNeedContinue == PR_TRUE)
+    {
+        pt_Continuation op;
+        op.arg1.osfd = osfd;
+        op.arg2.buffer = buf;
+        op.arg3.amount = amount;
+        op.arg4.flags = flags;
+        op.arg5.addr = addr;
+        op.timeout = timeout;
+        op.function = pt_recvfrom_cont;
+        op.event = PR_POLL_READ | PR_POLL_EXCEPT;
+        bytes = pt_Continue(&op);
+        if (bytes < 0) {
+            WSASetLastError(op.syserrno);
+			_PR_MD_MAP_RECVFROM_ERROR(op.syserrno);
+        }
+    }
+    return bytes;
+}  /* pt_RecvFrom */
diff --git a/nsprpub/pr/src/md/windows/ntmisc.c b/nsprpub/pr/src/md/windows/ntmisc.c
new file mode 100644
index 000000000..12f8c1df7
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/ntmisc.c
@@ -0,0 +1,1201 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * ntmisc.c
+ *
+ */
+
+#include "primpl.h"
+#include <math.h>     /* for fabs() */
+#include <windows.h>
+
+char *_PR_MD_GET_ENV(const char *name)
+{
+    return getenv(name);
+}
+
+/*
+** _PR_MD_PUT_ENV() -- add or change environment variable
+**
+**
+*/
+PRIntn _PR_MD_PUT_ENV(const char *name)
+{
+    return(putenv(name));
+}
+
+
+/*
+ **************************************************************************
+ **************************************************************************
+ **
+ **     Date and time routines
+ **
+ **************************************************************************
+ **************************************************************************
+ */
+
+/*
+ * The NSPR epoch (00:00:00 1 Jan 1970 UTC) in FILETIME.
+ * We store the value in a PRTime variable for convenience.
+ */
+#ifdef __GNUC__
+const PRTime _pr_filetime_offset = 116444736000000000LL;
+const PRTime _pr_filetime_divisor = 10LL;
+#else
+const PRTime _pr_filetime_offset = 116444736000000000i64;
+const PRTime _pr_filetime_divisor = 10i64;
+#endif
+
+#ifdef WINCE
+
+#define FILETIME_TO_INT64(ft) \
+  (((PRInt64)ft.dwHighDateTime) << 32 | (PRInt64)ft.dwLowDateTime)
+
+static void
+LowResTime(LPFILETIME lpft)
+{
+    GetCurrentFT(lpft);
+}
+
+typedef struct CalibrationData {
+    long double freq;         /* The performance counter frequency */
+    long double offset;       /* The low res 'epoch' */
+    long double timer_offset; /* The high res 'epoch' */
+
+    /* The last high res time that we returned since recalibrating */
+    PRInt64 last;
+
+    PRBool calibrated;
+
+    CRITICAL_SECTION data_lock;
+    CRITICAL_SECTION calibration_lock;
+    PRInt64 granularity;
+} CalibrationData;
+
+static CalibrationData calibration;
+
+typedef void (*GetSystemTimeAsFileTimeFcn)(LPFILETIME);
+static GetSystemTimeAsFileTimeFcn ce6_GetSystemTimeAsFileTime = NULL;
+
+static void
+NowCalibrate(void)
+{
+    FILETIME ft, ftStart;
+    LARGE_INTEGER liFreq, now;
+
+    if (calibration.freq == 0.0) {
+	if(!QueryPerformanceFrequency(&liFreq)) {
+	    /* High-performance timer is unavailable */
+	    calibration.freq = -1.0;
+	} else {
+	    calibration.freq = (long double) liFreq.QuadPart;
+	}
+    }
+    if (calibration.freq > 0.0) {
+	PRInt64 calibrationDelta = 0;
+	/*
+	 * By wrapping a timeBegin/EndPeriod pair of calls around this loop,
+	 * the loop seems to take much less time (1 ms vs 15ms) on Vista. 
+	 */
+	timeBeginPeriod(1);
+	LowResTime(&ftStart);
+	do {
+	    LowResTime(&ft);
+	} while (memcmp(&ftStart,&ft, sizeof(ft)) == 0);
+	timeEndPeriod(1);
+
+	calibration.granularity = 
+	    (FILETIME_TO_INT64(ft) - FILETIME_TO_INT64(ftStart))/10;
+
+	QueryPerformanceCounter(&now);
+
+	calibration.offset = (long double) FILETIME_TO_INT64(ft);
+	calibration.timer_offset = (long double) now.QuadPart;
+	/*
+	 * The windows epoch is around 1600. The unix epoch is around 1970. 
+	 * _pr_filetime_offset is the difference (in windows time units which
+	 * are 10 times more highres than the JS time unit) 
+	 */
+	calibration.offset -= _pr_filetime_offset;
+	calibration.offset *= 0.1;
+	calibration.last = 0;
+
+	calibration.calibrated = PR_TRUE;
+    }
+}
+
+#define CALIBRATIONLOCK_SPINCOUNT 0
+#define DATALOCK_SPINCOUNT 4096
+#define LASTLOCK_SPINCOUNT 4096
+
+void
+_MD_InitTime(void)
+{
+    /* try for CE6 GetSystemTimeAsFileTime first */
+    HANDLE h = GetModuleHandleW(L"coredll.dll");
+    ce6_GetSystemTimeAsFileTime = (GetSystemTimeAsFileTimeFcn)
+        GetProcAddressA(h, "GetSystemTimeAsFileTime");
+
+    /* otherwise go the slow route */
+    if (ce6_GetSystemTimeAsFileTime == NULL) {
+        memset(&calibration, 0, sizeof(calibration));
+        NowCalibrate();
+        InitializeCriticalSection(&calibration.calibration_lock);
+        InitializeCriticalSection(&calibration.data_lock);
+    }
+}
+
+void
+_MD_CleanupTime(void)
+{
+    if (ce6_GetSystemTimeAsFileTime == NULL) {
+        DeleteCriticalSection(&calibration.calibration_lock);
+        DeleteCriticalSection(&calibration.data_lock);
+    }
+}
+
+#define MUTEX_SETSPINCOUNT(m, c)
+
+/*
+ *-----------------------------------------------------------------------
+ *
+ * PR_Now --
+ *
+ *     Returns the current time in microseconds since the epoch.
+ *     The epoch is midnight January 1, 1970 GMT.
+ *     The implementation is machine dependent.  This is the
+ *     implementation for Windows.
+ *     Cf. time_t time(time_t *tp)
+ *
+ *-----------------------------------------------------------------------
+ */
+
+PR_IMPLEMENT(PRTime)
+PR_Now(void)
+{
+    long double lowresTime, highresTimerValue;
+    FILETIME ft;
+    LARGE_INTEGER now;
+    PRBool calibrated = PR_FALSE;
+    PRBool needsCalibration = PR_FALSE;
+    PRInt64 returnedTime;
+    long double cachedOffset = 0.0;
+
+    if (ce6_GetSystemTimeAsFileTime) {
+        union {
+            FILETIME ft;
+            PRTime prt;
+        } currentTime;
+
+        PR_ASSERT(sizeof(FILETIME) == sizeof(PRTime));
+
+        ce6_GetSystemTimeAsFileTime(&currentTime.ft);
+
+        /* written this way on purpose, since the second term becomes
+         * a constant, and the entire expression is faster to execute.
+         */
+        return currentTime.prt/_pr_filetime_divisor -
+            _pr_filetime_offset/_pr_filetime_divisor;
+    }
+
+    do {
+	if (!calibration.calibrated || needsCalibration) {
+	    EnterCriticalSection(&calibration.calibration_lock);
+	    EnterCriticalSection(&calibration.data_lock);
+
+	    /* Recalibrate only if no one else did before us */
+	    if (calibration.offset == cachedOffset) {
+		/*
+		 * Since calibration can take a while, make any other
+		 * threads immediately wait 
+		 */
+		MUTEX_SETSPINCOUNT(&calibration.data_lock, 0);
+
+		NowCalibrate();
+
+		calibrated = PR_TRUE;
+
+		/* Restore spin count */
+		MUTEX_SETSPINCOUNT(&calibration.data_lock, DATALOCK_SPINCOUNT);
+	    }
+	    LeaveCriticalSection(&calibration.data_lock);
+	    LeaveCriticalSection(&calibration.calibration_lock);
+	}
+
+	/* Calculate a low resolution time */
+	LowResTime(&ft);
+	lowresTime =
+            ((long double)(FILETIME_TO_INT64(ft) - _pr_filetime_offset)) * 0.1;
+
+	if (calibration.freq > 0.0) {
+	    long double highresTime, diff;
+	    DWORD timeAdjustment, timeIncrement;
+	    BOOL timeAdjustmentDisabled;
+
+	    /* Default to 15.625 ms if the syscall fails */
+	    long double skewThreshold = 15625.25;
+
+	    /* Grab high resolution time */
+	    QueryPerformanceCounter(&now);
+	    highresTimerValue = (long double)now.QuadPart;
+
+	    EnterCriticalSection(&calibration.data_lock);
+	    highresTime = calibration.offset + 1000000L *
+		(highresTimerValue-calibration.timer_offset)/calibration.freq;
+	    cachedOffset = calibration.offset;
+
+	    /* 
+	     * On some dual processor/core systems, we might get an earlier 
+	     * time so we cache the last time that we returned.
+	     */
+	    calibration.last = PR_MAX(calibration.last,(PRInt64)highresTime);
+	    returnedTime = calibration.last;
+	    LeaveCriticalSection(&calibration.data_lock);
+
+	    /* Get an estimate of clock ticks per second from our own test */
+	    skewThreshold = calibration.granularity;
+	    /* Check for clock skew */
+	    diff = lowresTime - highresTime;
+
+	    /* 
+	     * For some reason that I have not determined, the skew can be
+	     * up to twice a kernel tick. This does not seem to happen by
+	     * itself, but I have only seen it triggered by another program
+	     * doing some kind of file I/O. The symptoms are a negative diff
+	     * followed by an equally large positive diff. 
+	     */
+	    if (fabs(diff) > 2*skewThreshold) {
+		if (calibrated) {
+		    /*
+		     * If we already calibrated once this instance, and the
+		     * clock is still skewed, then either the processor(s) are
+		     * wildly changing clockspeed or the system is so busy that
+		     * we get switched out for long periods of time. In either
+		     * case, it would be infeasible to make use of high
+		     * resolution results for anything, so let's resort to old
+		     * behavior for this call. It's possible that in the
+		     * future, the user will want the high resolution timer, so
+		     * we don't disable it entirely. 
+		     */
+		    returnedTime = (PRInt64)lowresTime;
+		    needsCalibration = PR_FALSE;
+		} else {
+		    /*
+		     * It is possible that when we recalibrate, we will return 
+		     * a value less than what we have returned before; this is
+		     * unavoidable. We cannot tell the different between a
+		     * faulty QueryPerformanceCounter implementation and user
+		     * changes to the operating system time. Since we must
+		     * respect user changes to the operating system time, we
+		     * cannot maintain the invariant that Date.now() never
+		     * decreases; the old implementation has this behavior as
+		     * well. 
+		     */
+		    needsCalibration = PR_TRUE;
+		}
+	    } else {
+		/* No detectable clock skew */
+		returnedTime = (PRInt64)highresTime;
+		needsCalibration = PR_FALSE;
+	    }
+	} else {
+	    /* No high resolution timer is available, so fall back */
+	    returnedTime = (PRInt64)lowresTime;
+	}
+    } while (needsCalibration);
+
+    return returnedTime;
+}
+
+#else
+
+PR_IMPLEMENT(PRTime)
+PR_Now(void)
+{
+    PRTime prt;
+    FILETIME ft;
+    SYSTEMTIME st;
+
+    GetSystemTime(&st);
+    SystemTimeToFileTime(&st, &ft);
+    _PR_FileTimeToPRTime(&ft, &prt);
+    return prt;       
+}
+
+#endif
+
+/*
+ ***********************************************************************
+ ***********************************************************************
+ *
+ * Process creation routines
+ *
+ ***********************************************************************
+ ***********************************************************************
+ */
+
+/*
+ * Assemble the command line by concatenating the argv array.
+ * On success, this function returns 0 and the resulting command
+ * line is returned in *cmdLine.  On failure, it returns -1.
+ */
+static int assembleCmdLine(char *const *argv, char **cmdLine)
+{
+    char *const *arg;
+    char *p, *q;
+    size_t cmdLineSize;
+    int numBackslashes;
+    int i;
+    int argNeedQuotes;
+
+    /*
+     * Find out how large the command line buffer should be.
+     */
+    cmdLineSize = 0;
+    for (arg = argv; *arg; arg++) {
+        /*
+         * \ and " need to be escaped by a \.  In the worst case,
+         * every character is a \ or ", so the string of length
+         * may double.  If we quote an argument, that needs two ".
+         * Finally, we need a space between arguments, and
+         * a null byte at the end of command line.
+         */
+        cmdLineSize += 2 * strlen(*arg)  /* \ and " need to be escaped */
+                + 2                      /* we quote every argument */
+                + 1;                     /* space in between, or final null */
+    }
+    p = *cmdLine = PR_MALLOC((PRUint32) cmdLineSize);
+    if (p == NULL) {
+        return -1;
+    }
+
+    for (arg = argv; *arg; arg++) {
+        /* Add a space to separates the arguments */
+        if (arg != argv) {
+            *p++ = ' '; 
+        }
+        q = *arg;
+        numBackslashes = 0;
+        argNeedQuotes = 0;
+
+        /*
+         * If the argument is empty or contains white space, it needs to
+         * be quoted.
+         */
+        if (**arg == '\0' || strpbrk(*arg, " \f\n\r\t\v")) {
+            argNeedQuotes = 1;
+        }
+
+        if (argNeedQuotes) {
+            *p++ = '"';
+        }
+        while (*q) {
+            if (*q == '\\') {
+                numBackslashes++;
+                q++;
+            } else if (*q == '"') {
+                if (numBackslashes) {
+                    /*
+                     * Double the backslashes since they are followed
+                     * by a quote
+                     */
+                    for (i = 0; i < 2 * numBackslashes; i++) {
+                        *p++ = '\\';
+                    }
+                    numBackslashes = 0;
+                }
+                /* To escape the quote */
+                *p++ = '\\';
+                *p++ = *q++;
+            } else {
+                if (numBackslashes) {
+                    /*
+                     * Backslashes are not followed by a quote, so
+                     * don't need to double the backslashes.
+                     */
+                    for (i = 0; i < numBackslashes; i++) {
+                        *p++ = '\\';
+                    }
+                    numBackslashes = 0;
+                }
+                *p++ = *q++;
+            }
+        }
+
+        /* Now we are at the end of this argument */
+        if (numBackslashes) {
+            /*
+             * Double the backslashes if we have a quote string
+             * delimiter at the end.
+             */
+            if (argNeedQuotes) {
+                numBackslashes *= 2;
+            }
+            for (i = 0; i < numBackslashes; i++) {
+                *p++ = '\\';
+            }
+        }
+        if (argNeedQuotes) {
+            *p++ = '"';
+        }
+    } 
+
+    *p = '\0';
+    return 0;
+}
+
+/*
+ * Assemble the environment block by concatenating the envp array
+ * (preserving the terminating null byte in each array element)
+ * and adding a null byte at the end.
+ *
+ * Returns 0 on success.  The resulting environment block is returned
+ * in *envBlock.  Note that if envp is NULL, a NULL pointer is returned
+ * in *envBlock.  Returns -1 on failure.
+ */
+static int assembleEnvBlock(char **envp, char **envBlock)
+{
+    char *p;
+    char *q;
+    char **env;
+    char *curEnv;
+    char *cwdStart, *cwdEnd;
+    size_t envBlockSize;
+
+    if (envp == NULL) {
+        *envBlock = NULL;
+        return 0;
+    }
+
+#ifdef WINCE
+    {
+        PRUnichar *wideCurEnv = mozce_GetEnvString();
+        int len = WideCharToMultiByte(CP_ACP, 0, wideCurEnv, -1,
+                                      NULL, 0, NULL, NULL);
+        curEnv = (char *) PR_MALLOC(len * sizeof(char));
+        WideCharToMultiByte(CP_ACP, 0, wideCurEnv, -1,
+                            curEnv, len, NULL, NULL);
+        free(wideCurEnv);
+    }
+#else
+    curEnv = GetEnvironmentStrings();
+#endif
+
+    cwdStart = curEnv;
+    while (*cwdStart) {
+        if (cwdStart[0] == '=' && cwdStart[1] != '\0'
+                && cwdStart[2] == ':' && cwdStart[3] == '=') {
+            break;
+        }
+        cwdStart += strlen(cwdStart) + 1;
+    }
+    cwdEnd = cwdStart;
+    if (*cwdEnd) {
+        cwdEnd += strlen(cwdEnd) + 1;
+        while (*cwdEnd) {
+            if (cwdEnd[0] != '=' || cwdEnd[1] == '\0'
+                    || cwdEnd[2] != ':' || cwdEnd[3] != '=') {
+                break;
+            }
+            cwdEnd += strlen(cwdEnd) + 1;
+        }
+    }
+    envBlockSize = cwdEnd - cwdStart;
+
+    for (env = envp; *env; env++) {
+        envBlockSize += strlen(*env) + 1;
+    }
+    envBlockSize++;
+
+    p = *envBlock = PR_MALLOC((PRUint32) envBlockSize);
+    if (p == NULL) {
+#ifdef WINCE
+        PR_Free(curEnv);
+#else
+        FreeEnvironmentStrings(curEnv);
+#endif
+        return -1;
+    }
+
+    q = cwdStart;
+    while (q < cwdEnd) {
+        *p++ = *q++;
+    }
+#ifdef WINCE
+    PR_Free(curEnv);
+#else
+    FreeEnvironmentStrings(curEnv);
+#endif
+
+    for (env = envp; *env; env++) {
+        q = *env;
+        while (*q) {
+            *p++ = *q++;
+        }
+        *p++ = '\0';
+    }
+    *p = '\0';
+    return 0;
+}
+
+/*
+ * For qsort.  We sort (case-insensitive) the environment strings
+ * before generating the environment block.
+ */
+static int compare(const void *arg1, const void *arg2)
+{
+    return _stricmp(* (char**)arg1, * (char**)arg2);
+}
+
+PRProcess * _PR_CreateWindowsProcess(
+    const char *path,
+    char *const *argv,
+    char *const *envp,
+    const PRProcessAttr *attr)
+{
+#ifdef WINCE
+    STARTUPINFOW startupInfo;
+    PRUnichar *wideCmdLine;
+    PRUnichar *wideCwd;
+    int len = 0;
+#else
+    STARTUPINFO startupInfo;
+#endif
+    DWORD creationFlags = 0;
+    PROCESS_INFORMATION procInfo;
+    BOOL retVal;
+    char *cmdLine = NULL;
+    char *envBlock = NULL;
+    char **newEnvp = NULL;
+    const char *cwd = NULL; /* current working directory */
+    PRProcess *proc = NULL;
+    PRBool hasFdInheritBuffer;
+
+    proc = PR_NEW(PRProcess);
+    if (!proc) {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+        goto errorExit;
+    }
+
+    if (assembleCmdLine(argv, &cmdLine) == -1) {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+        goto errorExit;
+    }
+
+#ifndef WINCE
+    /*
+     * If attr->fdInheritBuffer is not NULL, we need to insert
+     * it into the envp array, so envp cannot be NULL.
+     */
+    hasFdInheritBuffer = (attr && attr->fdInheritBuffer);
+    if ((envp == NULL) && hasFdInheritBuffer) {
+        envp = environ;
+    }
+
+    if (envp != NULL) {
+        int idx;
+        int numEnv;
+        PRBool found = PR_FALSE;
+
+        numEnv = 0;
+        while (envp[numEnv]) {
+            numEnv++;
+        }
+        newEnvp = (char **) PR_MALLOC((numEnv + 2) * sizeof(char *));
+        for (idx = 0; idx < numEnv; idx++) {
+            newEnvp[idx] = envp[idx];
+            if (hasFdInheritBuffer && !found
+                    && !strncmp(newEnvp[idx], "NSPR_INHERIT_FDS=", 17)) {
+                newEnvp[idx] = attr->fdInheritBuffer;
+                found = PR_TRUE;
+            }
+        }
+        if (hasFdInheritBuffer && !found) {
+            newEnvp[idx++] = attr->fdInheritBuffer;
+        }
+        newEnvp[idx] = NULL;
+        qsort((void *) newEnvp, (size_t) idx, sizeof(char *), compare);
+    }
+    if (assembleEnvBlock(newEnvp, &envBlock) == -1) {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+        goto errorExit;
+    }
+
+    ZeroMemory(&startupInfo, sizeof(startupInfo));
+    startupInfo.cb = sizeof(startupInfo);
+
+    if (attr) {
+        PRBool redirected = PR_FALSE;
+
+        /*
+         * XXX the default value for stdin, stdout, and stderr
+         * should probably be the console input and output, not
+         * those of the parent process.
+         */
+        startupInfo.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
+        startupInfo.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
+        startupInfo.hStdError = GetStdHandle(STD_ERROR_HANDLE);
+        if (attr->stdinFd) {
+            startupInfo.hStdInput = (HANDLE) attr->stdinFd->secret->md.osfd;
+            redirected = PR_TRUE;
+        }
+        if (attr->stdoutFd) {
+            startupInfo.hStdOutput = (HANDLE) attr->stdoutFd->secret->md.osfd;
+            redirected = PR_TRUE;
+            /*
+             * If stdout is redirected, we can assume that the process will
+             * not write anything useful to the console windows, and therefore
+             * automatically set the CREATE_NO_WINDOW flag.
+             */
+            creationFlags |= CREATE_NO_WINDOW;
+        }
+        if (attr->stderrFd) {
+            startupInfo.hStdError = (HANDLE) attr->stderrFd->secret->md.osfd;
+            redirected = PR_TRUE;
+        }
+        if (redirected) {
+            startupInfo.dwFlags |= STARTF_USESTDHANDLES;
+        }
+        cwd = attr->currentDirectory;
+    }
+#endif
+
+#ifdef WINCE
+    len = MultiByteToWideChar(CP_ACP, 0, cmdLine, -1, NULL, 0);
+    wideCmdLine = (PRUnichar *)PR_MALLOC(len * sizeof(PRUnichar));
+    MultiByteToWideChar(CP_ACP, 0, cmdLine, -1, wideCmdLine, len);
+    len = MultiByteToWideChar(CP_ACP, 0, cwd, -1, NULL, 0);
+    wideCwd = PR_MALLOC(len * sizeof(PRUnichar));
+    MultiByteToWideChar(CP_ACP, 0, cwd, -1, wideCwd, len);
+    retVal = CreateProcessW(NULL,
+                            wideCmdLine,
+                            NULL,  /* security attributes for the new
+                                    * process */
+                            NULL,  /* security attributes for the primary
+                                    * thread in the new process */
+                            TRUE,  /* inherit handles */
+                            creationFlags,
+                            envBlock,  /* an environment block, consisting
+                                        * of a null-terminated block of
+                                        * null-terminated strings.  Each
+                                        * string is in the form:
+                                        *     name=value
+                                        * XXX: usually NULL */
+                            wideCwd,  /* current drive and directory */
+                            &startupInfo,
+                            &procInfo
+                           );
+    PR_Free(wideCmdLine);
+    PR_Free(wideCwd);
+#else
+    retVal = CreateProcess(NULL,
+                           cmdLine,
+                           NULL,  /* security attributes for the new
+                                   * process */
+                           NULL,  /* security attributes for the primary
+                                   * thread in the new process */
+                           TRUE,  /* inherit handles */
+                           creationFlags,
+                           envBlock,  /* an environment block, consisting
+                                       * of a null-terminated block of
+                                       * null-terminated strings.  Each
+                                       * string is in the form:
+                                       *     name=value
+                                       * XXX: usually NULL */
+                           cwd,  /* current drive and directory */
+                           &startupInfo,
+                           &procInfo
+                          );
+#endif
+
+    if (retVal == FALSE) {
+        /* XXX what error code? */
+        PR_SetError(PR_UNKNOWN_ERROR, GetLastError());
+        goto errorExit;
+    }
+
+    CloseHandle(procInfo.hThread);
+    proc->md.handle = procInfo.hProcess;
+    proc->md.id = procInfo.dwProcessId;
+
+    PR_DELETE(cmdLine);
+    if (newEnvp) {
+        PR_DELETE(newEnvp);
+    }
+    if (envBlock) {
+        PR_DELETE(envBlock);
+    }
+    return proc;
+
+errorExit:
+    if (cmdLine) {
+        PR_DELETE(cmdLine);
+    }
+    if (newEnvp) {
+        PR_DELETE(newEnvp);
+    }
+    if (envBlock) {
+        PR_DELETE(envBlock);
+    }
+    if (proc) {
+        PR_DELETE(proc);
+    }
+    return NULL;
+}  /* _PR_CreateWindowsProcess */
+
+PRStatus _PR_DetachWindowsProcess(PRProcess *process)
+{
+    CloseHandle(process->md.handle);
+    PR_DELETE(process);
+    return PR_SUCCESS;
+}
+
+/*
+ * XXX: This implementation is a temporary quick solution.
+ * It can be called by native threads only (not by fibers).
+ */
+PRStatus _PR_WaitWindowsProcess(PRProcess *process,
+    PRInt32 *exitCode)
+{
+    DWORD dwRetVal;
+
+    dwRetVal = WaitForSingleObject(process->md.handle, INFINITE);
+    if (dwRetVal == WAIT_FAILED) {
+        PR_SetError(PR_UNKNOWN_ERROR, GetLastError());
+        return PR_FAILURE;
+    }
+    PR_ASSERT(dwRetVal == WAIT_OBJECT_0);
+    if (exitCode != NULL &&
+            GetExitCodeProcess(process->md.handle, exitCode) == FALSE) {
+        PR_SetError(PR_UNKNOWN_ERROR, GetLastError());
+        return PR_FAILURE;
+    }
+    CloseHandle(process->md.handle);
+    PR_DELETE(process);
+    return PR_SUCCESS;
+}
+
+PRStatus _PR_KillWindowsProcess(PRProcess *process)
+{
+    /*
+     * On Unix, if a process terminates normally, its exit code is
+     * between 0 and 255.  So here on Windows, we use the exit code
+     * 256 to indicate that the process is killed.
+     */
+    if (TerminateProcess(process->md.handle, 256)) {
+	return PR_SUCCESS;
+    }
+    PR_SetError(PR_UNKNOWN_ERROR, GetLastError());
+    return PR_FAILURE;
+}
+
+PRStatus _MD_WindowsGetHostName(char *name, PRUint32 namelen)
+{
+    PRIntn rv;
+    PRInt32 syserror;
+
+    rv = gethostname(name, (PRInt32) namelen);
+    if (0 == rv) {
+        return PR_SUCCESS;
+    }
+    syserror = WSAGetLastError();
+    PR_ASSERT(WSANOTINITIALISED != syserror);
+	_PR_MD_MAP_GETHOSTNAME_ERROR(syserror);
+    return PR_FAILURE;
+}
+
+PRStatus _MD_WindowsGetSysInfo(PRSysInfo cmd, char *name, PRUint32 namelen)
+{
+	OSVERSIONINFO osvi;
+
+	PR_ASSERT((cmd == PR_SI_SYSNAME) || (cmd == PR_SI_RELEASE));
+
+	ZeroMemory(&osvi, sizeof(OSVERSIONINFO));
+	osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
+
+	if (! GetVersionEx (&osvi) ) {
+		_PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+    	return PR_FAILURE;
+	}
+
+	switch (osvi.dwPlatformId) {
+		case VER_PLATFORM_WIN32_NT:
+			if (PR_SI_SYSNAME == cmd)
+				(void)PR_snprintf(name, namelen, "Windows_NT");
+			else if (PR_SI_RELEASE == cmd)
+				(void)PR_snprintf(name, namelen, "%d.%d",osvi.dwMajorVersion, 
+            							osvi.dwMinorVersion);
+			break;
+		case VER_PLATFORM_WIN32_WINDOWS:
+			if (PR_SI_SYSNAME == cmd) {
+				if ((osvi.dwMajorVersion > 4) || 
+					((osvi.dwMajorVersion == 4) && (osvi.dwMinorVersion > 0)))
+					(void)PR_snprintf(name, namelen, "Windows_98");
+				else
+					(void)PR_snprintf(name, namelen, "Windows_95");
+			} else if (PR_SI_RELEASE == cmd) {
+				(void)PR_snprintf(name, namelen, "%d.%d",osvi.dwMajorVersion, 
+            							osvi.dwMinorVersion);
+			}
+			break;
+#ifdef VER_PLATFORM_WIN32_CE
+    case VER_PLATFORM_WIN32_CE:
+			if (PR_SI_SYSNAME == cmd)
+				(void)PR_snprintf(name, namelen, "Windows_CE");
+			else if (PR_SI_RELEASE == cmd)
+				(void)PR_snprintf(name, namelen, "%d.%d",osvi.dwMajorVersion, 
+            							osvi.dwMinorVersion);
+			break;
+#endif
+   		default:
+			if (PR_SI_SYSNAME == cmd)
+				(void)PR_snprintf(name, namelen, "Windows_Unknown");
+			else if (PR_SI_RELEASE == cmd)
+				(void)PR_snprintf(name, namelen, "%d.%d",0,0);
+			break;
+	}
+	return PR_SUCCESS;
+}
+
+PRStatus _MD_WindowsGetReleaseName(char *name, PRUint32 namelen)
+{
+	OSVERSIONINFO osvi;
+
+	ZeroMemory(&osvi, sizeof(OSVERSIONINFO));
+	osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
+
+	if (! GetVersionEx (&osvi) ) {
+		_PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+    	return PR_FAILURE;
+	}
+
+	switch (osvi.dwPlatformId) {
+		case VER_PLATFORM_WIN32_NT:
+		case VER_PLATFORM_WIN32_WINDOWS:
+			(void)PR_snprintf(name, namelen, "%d.%d",osvi.dwMajorVersion, 
+            							osvi.dwMinorVersion);
+			break;
+   		default:
+			(void)PR_snprintf(name, namelen, "%d.%d",0,0);
+			break;
+	}
+	return PR_SUCCESS;
+}
+
+/*
+ **********************************************************************
+ *
+ * Memory-mapped files
+ *
+ **********************************************************************
+ */
+
+PRStatus _MD_CreateFileMap(PRFileMap *fmap, PRInt64 size)
+{
+    DWORD dwHi, dwLo;
+    DWORD flProtect;
+    PROsfd osfd;
+
+    osfd = ( fmap->fd == (PRFileDesc*)-1 )?  -1 : fmap->fd->secret->md.osfd;
+
+    dwLo = (DWORD) (size & 0xffffffff);
+    dwHi = (DWORD) (((PRUint64) size >> 32) & 0xffffffff);
+
+    if (fmap->prot == PR_PROT_READONLY) {
+        flProtect = PAGE_READONLY;
+        fmap->md.dwAccess = FILE_MAP_READ;
+    } else if (fmap->prot == PR_PROT_READWRITE) {
+        flProtect = PAGE_READWRITE;
+        fmap->md.dwAccess = FILE_MAP_WRITE;
+    } else {
+        PR_ASSERT(fmap->prot == PR_PROT_WRITECOPY);
+#ifdef WINCE
+        /* WINCE does not have FILE_MAP_COPY. */
+        PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+        return PR_FAILURE;
+#else
+        flProtect = PAGE_WRITECOPY;
+        fmap->md.dwAccess = FILE_MAP_COPY;
+#endif
+    }
+
+    fmap->md.hFileMap = CreateFileMapping(
+        (HANDLE) osfd,
+        NULL,
+        flProtect,
+        dwHi,
+        dwLo,
+        NULL);
+
+    if (fmap->md.hFileMap == NULL) {
+        PR_SetError(PR_UNKNOWN_ERROR, GetLastError());
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}
+
+PRInt32 _MD_GetMemMapAlignment(void)
+{
+    SYSTEM_INFO info;
+    GetSystemInfo(&info);
+    return info.dwAllocationGranularity;
+}
+
+extern PRLogModuleInfo *_pr_shma_lm;
+
+void * _MD_MemMap(
+    PRFileMap *fmap,
+    PROffset64 offset,
+    PRUint32 len)
+{
+    DWORD dwHi, dwLo;
+    void *addr;
+
+    dwLo = (DWORD) (offset & 0xffffffff);
+    dwHi = (DWORD) (((PRUint64) offset >> 32) & 0xffffffff);
+    if ((addr = MapViewOfFile(fmap->md.hFileMap, fmap->md.dwAccess,
+            dwHi, dwLo, len)) == NULL) {
+        {
+            LPVOID lpMsgBuf; 
+            
+            FormatMessage( 
+                FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
+                NULL,
+                GetLastError(),
+                MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
+                (LPTSTR) &lpMsgBuf,
+                0,
+                NULL 
+            );
+            PR_LOG( _pr_shma_lm, PR_LOG_DEBUG, ("md_memmap(): %s", lpMsgBuf ));
+        }
+        PR_SetError(PR_UNKNOWN_ERROR, GetLastError());
+    }
+    return addr;
+}
+
+PRStatus _MD_MemUnmap(void *addr, PRUint32 len)
+{
+    if (UnmapViewOfFile(addr)) {
+        return PR_SUCCESS;
+    }
+    _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+    return PR_FAILURE;
+}
+
+PRStatus _MD_CloseFileMap(PRFileMap *fmap)
+{
+    CloseHandle(fmap->md.hFileMap);
+    PR_DELETE(fmap);
+    return PR_SUCCESS;
+}
+
+PRStatus _MD_SyncMemMap(
+    PRFileDesc *fd,
+    void *addr,
+    PRUint32 len)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+
+    /* The FlushViewOfFile page on MSDN says:
+     *  To flush all the dirty pages plus the metadata for the file and
+     *  ensure that they are physically written to disk, call
+     *  FlushViewOfFile and then call the FlushFileBuffers function.
+     */
+    if (FlushViewOfFile(addr, len) && FlushFileBuffers((HANDLE) osfd)) {
+        return PR_SUCCESS;
+    }
+    _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+    return PR_FAILURE;
+}
+
+/*
+ ***********************************************************************
+ *
+ * Atomic increment and decrement operations for x86 processors
+ *
+ * We don't use InterlockedIncrement and InterlockedDecrement
+ * because on NT 3.51 and Win95, they return a number with
+ * the same sign as the incremented/decremented result, rather
+ * than the result itself.  On NT 4.0 these functions do return
+ * the incremented/decremented result.
+ *
+ * The result is returned in the eax register by the inline
+ * assembly code.  We disable the harmless "no return value"
+ * warning (4035) for these two functions.
+ *
+ ***********************************************************************
+ */
+
+#if defined(_M_IX86) || defined(_X86_)
+
+#pragma warning(disable: 4035)
+PRInt32 _PR_MD_ATOMIC_INCREMENT(PRInt32 *val)
+{    
+#if defined(__GNUC__)
+  PRInt32 result;
+  asm volatile ("lock ; xadd %0, %1" 
+                : "=r"(result), "=m"(*val)
+                : "0"(1), "m"(*val));
+  return result + 1;
+#else
+    __asm
+    {
+        mov ecx, val
+        mov eax, 1
+        lock xadd dword ptr [ecx], eax
+        inc eax
+    }
+#endif /* __GNUC__ */
+}
+#pragma warning(default: 4035)
+
+#pragma warning(disable: 4035)
+PRInt32 _PR_MD_ATOMIC_DECREMENT(PRInt32 *val)
+{
+#if defined(__GNUC__)
+  PRInt32 result;
+  asm volatile ("lock ; xadd %0, %1" 
+                : "=r"(result), "=m"(*val)
+                : "0"(-1), "m"(*val));
+  //asm volatile("lock ; xadd %0, %1" : "=m" (val), "=a" (result) : "-1" (1));
+  return result - 1;
+#else
+    __asm
+    {
+        mov ecx, val
+        mov eax, 0ffffffffh
+        lock xadd dword ptr [ecx], eax
+        dec eax
+    }
+#endif /* __GNUC__ */
+}
+#pragma warning(default: 4035)
+
+#pragma warning(disable: 4035)
+PRInt32 _PR_MD_ATOMIC_ADD(PRInt32 *intp, PRInt32 val)
+{
+#if defined(__GNUC__)
+  PRInt32 result;
+  //asm volatile("lock ; xadd %1, %0" : "=m" (intp), "=a" (result) : "1" (val));
+  asm volatile ("lock ; xadd %0, %1" 
+                : "=r"(result), "=m"(*intp)
+                : "0"(val), "m"(*intp));
+  return result + val;
+#else
+    __asm
+    {
+        mov ecx, intp
+        mov eax, val
+        mov edx, eax
+        lock xadd dword ptr [ecx], eax
+        add eax, edx
+    }
+#endif /* __GNUC__ */
+}
+#pragma warning(default: 4035)
+
+#ifdef _PR_HAVE_ATOMIC_CAS
+
+#pragma warning(disable: 4035)
+void 
+PR_StackPush(PRStack *stack, PRStackElem *stack_elem)
+{
+#if defined(__GNUC__)
+  void **tos = (void **) stack;
+  void *tmp;
+  
+ retry:
+  if (*tos == (void *) -1)
+    goto retry;
+  
+  __asm__("xchg %0,%1"
+          : "=r" (tmp), "=m"(*tos)
+          : "0" (-1), "m"(*tos));
+  
+  if (tmp == (void *) -1)
+    goto retry;
+  
+  *(void **)stack_elem = tmp;
+  __asm__("" : : : "memory");
+  *tos = stack_elem;
+#else
+    __asm
+    {
+	mov ebx, stack
+	mov ecx, stack_elem
+retry:	mov eax,[ebx]
+	cmp eax,-1
+	je retry
+	mov eax,-1
+	xchg dword ptr [ebx], eax
+	cmp eax,-1
+	je  retry
+	mov [ecx],eax
+	mov [ebx],ecx
+    }
+#endif /* __GNUC__ */
+}
+#pragma warning(default: 4035)
+
+#pragma warning(disable: 4035)
+PRStackElem * 
+PR_StackPop(PRStack *stack)
+{
+#if defined(__GNUC__)
+  void **tos = (void **) stack;
+  void *tmp;
+  
+ retry:
+  if (*tos == (void *) -1)
+    goto retry;
+  
+  __asm__("xchg %0,%1"
+          : "=r" (tmp), "=m"(*tos)
+          : "0" (-1), "m"(*tos));
+
+  if (tmp == (void *) -1)
+    goto retry;
+  
+  if (tmp != (void *) 0)
+    {
+      void *next = *(void **)tmp;
+      *tos = next;
+      *(void **)tmp = 0;
+    }
+  else
+    *tos = tmp;
+  
+  return tmp;
+#else
+    __asm
+    {
+	mov ebx, stack
+retry:	mov eax,[ebx]
+	cmp eax,-1
+	je retry
+	mov eax,-1
+	xchg dword ptr [ebx], eax
+	cmp eax,-1
+	je  retry
+	cmp eax,0
+	je  empty
+	mov ecx,[eax]
+	mov [ebx],ecx
+	mov [eax],0
+	jmp done
+empty:
+	mov [ebx],eax
+done:	
+	}
+#endif /* __GNUC__ */
+}
+#pragma warning(default: 4035)
+
+#endif /* _PR_HAVE_ATOMIC_CAS */
+
+#endif /* x86 processors */
diff --git a/nsprpub/pr/src/md/windows/ntsec.c b/nsprpub/pr/src/md/windows/ntsec.c
new file mode 100644
index 000000000..c0682e454
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/ntsec.c
@@ -0,0 +1,261 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+
+/*
+ * ntsec.c
+ *
+ * Implement the POSIX-style mode bits (access permissions) for
+ * files and other securable objects in Windows NT using Windows
+ * NT's security descriptors with appropriate discretionary
+ * access-control lists.
+ */
+
+/*
+ * The security identifiers (SIDs) for owner, primary group,
+ * and the Everyone (World) group.
+ *
+ * These SIDs are looked up during NSPR initialization and
+ * saved in this global structure (see _PR_NT_InitSids) so
+ * that _PR_NT_MakeSecurityDescriptorACL doesn't need to
+ * look them up every time.
+ */
+static struct {
+    PSID owner;
+    PSID group;
+    PSID everyone;
+} _pr_nt_sids;
+
+/*
+ * Initialize the SIDs for owner, primary group, and the Everyone
+ * group in the _pr_nt_sids structure.
+ *
+ * This function needs to be called by NSPR initialization.
+ */
+void _PR_NT_InitSids(void)
+{
+#ifdef WINCE /* not supported */
+    return;
+#else
+    SID_IDENTIFIER_AUTHORITY SIDAuthWorld = SECURITY_WORLD_SID_AUTHORITY;
+    HANDLE hToken = NULL; /* initialized to an arbitrary value to
+                           * silence a Purify UMR warning */
+    PSID infoBuffer[1024/sizeof(PSID)]; /* defined as an array of PSIDs
+                                         * to force proper alignment */
+    PTOKEN_OWNER pTokenOwner = (PTOKEN_OWNER) infoBuffer;
+    PTOKEN_PRIMARY_GROUP pTokenPrimaryGroup
+            = (PTOKEN_PRIMARY_GROUP) infoBuffer;
+    DWORD dwLength;
+    BOOL rv;
+
+    /*
+     * Look up and make a copy of the owner and primary group
+     * SIDs in the access token of the calling process.
+     */
+    rv = OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &hToken);
+    if (rv == 0) {
+        /*
+         * On non-NT systems, this function is not implemented
+         * (error code ERROR_CALL_NOT_IMPLEMENTED), and neither are
+         * the other security functions.  There is no point in
+         * going further.
+         *
+         * A process with insufficient access permissions may fail
+         * with the error code ERROR_ACCESS_DENIED.
+         */
+        PR_LOG(_pr_io_lm, PR_LOG_DEBUG,
+                ("_PR_NT_InitSids: OpenProcessToken() failed. Error: %d",
+                GetLastError()));
+        return;
+    }
+
+    rv = GetTokenInformation(hToken, TokenOwner, infoBuffer,
+            sizeof(infoBuffer), &dwLength);
+    PR_ASSERT(rv != 0);
+    dwLength = GetLengthSid(pTokenOwner->Owner);
+    _pr_nt_sids.owner = (PSID) PR_Malloc(dwLength);
+    PR_ASSERT(_pr_nt_sids.owner != NULL);
+    rv = CopySid(dwLength, _pr_nt_sids.owner, pTokenOwner->Owner);
+    PR_ASSERT(rv != 0);
+
+    rv = GetTokenInformation(hToken, TokenPrimaryGroup, infoBuffer,
+            sizeof(infoBuffer), &dwLength);
+    PR_ASSERT(rv != 0);
+    dwLength = GetLengthSid(pTokenPrimaryGroup->PrimaryGroup);
+    _pr_nt_sids.group = (PSID) PR_Malloc(dwLength);
+    PR_ASSERT(_pr_nt_sids.group != NULL);
+    rv = CopySid(dwLength, _pr_nt_sids.group,
+            pTokenPrimaryGroup->PrimaryGroup);
+    PR_ASSERT(rv != 0);
+
+    rv = CloseHandle(hToken);
+    PR_ASSERT(rv != 0);
+
+    /* Create a well-known SID for the Everyone group. */
+    rv = AllocateAndInitializeSid(&SIDAuthWorld, 1,
+            SECURITY_WORLD_RID,
+            0, 0, 0, 0, 0, 0, 0,
+            &_pr_nt_sids.everyone);
+    PR_ASSERT(rv != 0);
+#endif
+}
+
+/*
+ * Free the SIDs for owner, primary group, and the Everyone group
+ * in the _pr_nt_sids structure.
+ *
+ * This function needs to be called by NSPR cleanup.
+ */
+void
+_PR_NT_FreeSids(void)
+{
+#ifdef WINCE
+    return;
+#else
+    if (_pr_nt_sids.owner) {
+        PR_Free(_pr_nt_sids.owner);
+    }
+    if (_pr_nt_sids.group) {
+        PR_Free(_pr_nt_sids.group);
+    }
+    if (_pr_nt_sids.everyone) {
+        FreeSid(_pr_nt_sids.everyone);
+    }
+#endif
+}
+
+/*
+ * Construct a security descriptor whose discretionary access-control
+ * list implements the specified mode bits.  The SIDs for owner, group,
+ * and everyone are obtained from the global _pr_nt_sids structure.
+ * Both the security descriptor and access-control list are returned
+ * and should be freed by a _PR_NT_FreeSecurityDescriptorACL call.
+ *
+ * The accessTable array maps NSPR's read, write, and execute access
+ * rights to the corresponding NT access rights for the securable
+ * object.
+ */
+PRStatus
+_PR_NT_MakeSecurityDescriptorACL(
+    PRIntn mode,
+    DWORD accessTable[],
+    PSECURITY_DESCRIPTOR *resultSD,
+    PACL *resultACL)
+{
+#ifdef WINCE
+    PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+    return PR_FAILURE;
+#else
+    PSECURITY_DESCRIPTOR pSD = NULL;
+    PACL pACL = NULL;
+    DWORD cbACL;  /* size of ACL */
+    DWORD accessMask;
+
+    if (_pr_nt_sids.owner == NULL) {
+        PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+        return PR_FAILURE;
+    }
+
+    pSD = (PSECURITY_DESCRIPTOR) PR_Malloc(SECURITY_DESCRIPTOR_MIN_LENGTH);
+    if (pSD == NULL) {
+        _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+        goto failed;
+    }
+    if (!InitializeSecurityDescriptor(pSD, SECURITY_DESCRIPTOR_REVISION)) {
+        _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+        goto failed;
+    }
+    if (!SetSecurityDescriptorOwner(pSD, _pr_nt_sids.owner, FALSE)) {
+        _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+        goto failed;
+    }
+    if (!SetSecurityDescriptorGroup(pSD, _pr_nt_sids.group, FALSE)) {
+        _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+        goto failed;
+    }
+
+    /*
+     * Construct a discretionary access-control list with three
+     * access-control entries, one each for owner, primary group,
+     * and Everyone.
+     */
+
+    cbACL = sizeof(ACL)
+          + 3 * (sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD))
+          + GetLengthSid(_pr_nt_sids.owner)
+          + GetLengthSid(_pr_nt_sids.group)
+          + GetLengthSid(_pr_nt_sids.everyone);
+    pACL = (PACL) PR_Malloc(cbACL);
+    if (pACL == NULL) {
+        _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+        goto failed;
+    }
+    if (!InitializeAcl(pACL, cbACL, ACL_REVISION)) {
+        _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+        goto failed;
+    }
+    accessMask = 0;
+    if (mode & 00400) accessMask |= accessTable[0];
+    if (mode & 00200) accessMask |= accessTable[1];
+    if (mode & 00100) accessMask |= accessTable[2];
+    if (accessMask && !AddAccessAllowedAce(pACL, ACL_REVISION, accessMask,
+            _pr_nt_sids.owner)) {
+        _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+        goto failed;
+    }
+    accessMask = 0;
+    if (mode & 00040) accessMask |= accessTable[0];
+    if (mode & 00020) accessMask |= accessTable[1];
+    if (mode & 00010) accessMask |= accessTable[2];
+    if (accessMask && !AddAccessAllowedAce(pACL, ACL_REVISION, accessMask,
+            _pr_nt_sids.group)) {
+        _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+        goto failed;
+    }
+    accessMask = 0;
+    if (mode & 00004) accessMask |= accessTable[0];
+    if (mode & 00002) accessMask |= accessTable[1];
+    if (mode & 00001) accessMask |= accessTable[2];
+    if (accessMask && !AddAccessAllowedAce(pACL, ACL_REVISION, accessMask,
+            _pr_nt_sids.everyone)) {
+        _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+        goto failed;
+    }
+
+    if (!SetSecurityDescriptorDacl(pSD, TRUE, pACL, FALSE)) {
+        _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+        goto failed;
+    }
+
+    *resultSD = pSD;
+    *resultACL = pACL;
+    return PR_SUCCESS;
+
+failed:
+    if (pSD) {
+        PR_Free(pSD);
+    }
+    if (pACL) {
+        PR_Free(pACL);
+    }
+    return PR_FAILURE;
+#endif
+}
+
+/*
+ * Free the specified security descriptor and access-control list
+ * previously created by _PR_NT_MakeSecurityDescriptorACL.
+ */
+void
+_PR_NT_FreeSecurityDescriptorACL(PSECURITY_DESCRIPTOR pSD, PACL pACL)
+{
+    if (pSD) {
+        PR_Free(pSD);
+    }
+    if (pACL) {
+        PR_Free(pACL);
+    }
+}
diff --git a/nsprpub/pr/src/md/windows/ntsem.c b/nsprpub/pr/src/md/windows/ntsem.c
new file mode 100644
index 000000000..f36a145a9
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/ntsem.c
@@ -0,0 +1,50 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * NT-specific semaphore handling code.
+ *
+ */
+
+
+#include "primpl.h"
+
+
+void 
+_PR_MD_NEW_SEM(_MDSemaphore *md, PRUintn value)
+{
+    md->sem = CreateSemaphore(NULL, value, 0x7fffffff, NULL);
+}
+
+void 
+_PR_MD_DESTROY_SEM(_MDSemaphore *md)
+{
+    CloseHandle(md->sem);
+}
+
+PRStatus 
+_PR_MD_TIMED_WAIT_SEM(_MDSemaphore *md, PRIntervalTime ticks)
+{
+    int rv;
+
+    rv = WaitForSingleObject(md->sem, PR_IntervalToMilliseconds(ticks));
+
+    if (rv == WAIT_OBJECT_0)
+        return PR_SUCCESS;
+    else
+        return PR_FAILURE;
+}
+
+PRStatus 
+_PR_MD_WAIT_SEM(_MDSemaphore *md)
+{
+    return _PR_MD_TIMED_WAIT_SEM(md, PR_INTERVAL_NO_TIMEOUT);
+}
+
+void 
+_PR_MD_POST_SEM(_MDSemaphore *md)
+{
+    ReleaseSemaphore(md->sem, 1, NULL);
+}
diff --git a/nsprpub/pr/src/md/windows/ntthread.c b/nsprpub/pr/src/md/windows/ntthread.c
new file mode 100644
index 000000000..fead1236d
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/ntthread.c
@@ -0,0 +1,564 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+#include <process.h>  /* for _beginthreadex() */
+
+/* --- globals ------------------------------------------------ */
+PRLock                       *_pr_schedLock = NULL;
+_PRInterruptTable             _pr_interruptTable[] = { { 0 } };
+
+BOOL _pr_use_static_tls = TRUE;
+__declspec(thread) PRThread  *_pr_current_fiber;
+__declspec(thread) PRThread  *_pr_fiber_last_run;
+__declspec(thread) _PRCPU    *_pr_current_cpu;
+__declspec(thread) PRUintn    _pr_ints_off;
+DWORD _pr_currentFiberIndex;
+DWORD _pr_lastFiberIndex;
+DWORD _pr_currentCPUIndex;
+DWORD _pr_intsOffIndex;
+
+_MDLock                       _nt_idleLock;
+PRCList                       _nt_idleList;
+PRUint32                        _nt_idleCount;
+
+extern __declspec(thread) PRThread *_pr_io_restarted_io;
+extern DWORD _pr_io_restartedIOIndex;
+
+/* Must check the restarted_io *before* decrementing no_sched to 0 */
+#define POST_SWITCH_WORK() \
+    PR_BEGIN_MACRO \
+        PRThread *restarted_io = \
+            (_pr_use_static_tls ? _pr_io_restarted_io \
+            : (PRThread *) TlsGetValue(_pr_io_restartedIOIndex)); \
+        if (restarted_io) { \
+            _nt_handle_restarted_io(restarted_io); \
+        } \
+        _PR_MD_LAST_THREAD()->no_sched = 0; \
+    PR_END_MACRO
+
+void
+_nt_handle_restarted_io(PRThread *restarted_io)
+{
+    /* After the switch we can resume an IO if needed.
+     * XXXMB - this needs to be done in create thread, since that could
+     * be the result for a context switch too..
+     */
+    PR_ASSERT(restarted_io->io_suspended == PR_TRUE);
+    PR_ASSERT(restarted_io->md.thr_bound_cpu == restarted_io->cpu);
+
+    _PR_THREAD_LOCK(restarted_io);
+    if (restarted_io->io_pending == PR_FALSE) {
+
+        /* The IO already completed, put us back on the runq. */
+        int pri = restarted_io->priority;
+
+        restarted_io->state = _PR_RUNNABLE;
+        _PR_RUNQ_LOCK(restarted_io->cpu);
+        _PR_ADD_RUNQ(restarted_io, restarted_io->cpu, pri);
+        _PR_RUNQ_UNLOCK(restarted_io->cpu);
+    } else {
+        _PR_SLEEPQ_LOCK(restarted_io->cpu);
+        _PR_ADD_SLEEPQ(restarted_io, restarted_io->sleep);
+        _PR_SLEEPQ_UNLOCK(restarted_io->cpu);
+    }
+    restarted_io->io_suspended = PR_FALSE;
+    restarted_io->md.thr_bound_cpu = NULL;
+
+    _PR_THREAD_UNLOCK(restarted_io);
+
+    if (_pr_use_static_tls) {
+        _pr_io_restarted_io = NULL;
+    } else {
+        TlsSetValue(_pr_io_restartedIOIndex, NULL);
+    }
+}
+
+void
+_PR_MD_EARLY_INIT()
+{
+    _MD_NEW_LOCK( &_nt_idleLock );
+    _nt_idleCount = 0;
+    PR_INIT_CLIST(&_nt_idleList);
+
+#if 0
+    /* Make the clock tick at least once per millisecond */
+    if ( timeBeginPeriod(1) == TIMERR_NOCANDO) {
+        /* deep yoghurt; clock doesn't tick fast enough! */
+        PR_ASSERT(0);
+    }
+#endif
+
+    if (!_pr_use_static_tls) {
+        _pr_currentFiberIndex = TlsAlloc();
+        _pr_lastFiberIndex = TlsAlloc();
+        _pr_currentCPUIndex = TlsAlloc();
+        _pr_intsOffIndex = TlsAlloc();
+        _pr_io_restartedIOIndex = TlsAlloc();
+    }
+}
+
+void _PR_MD_CLEANUP_BEFORE_EXIT(void)
+{
+    _PR_NT_FreeSids();
+
+    WSACleanup();
+
+    if (!_pr_use_static_tls) {
+        TlsFree(_pr_currentFiberIndex);
+        TlsFree(_pr_lastFiberIndex);
+        TlsFree(_pr_currentCPUIndex);
+        TlsFree(_pr_intsOffIndex);
+        TlsFree(_pr_io_restartedIOIndex);
+    }
+}
+
+PRStatus
+_PR_MD_INIT_THREAD(PRThread *thread)
+{
+    thread->md.overlapped.ioModel = _MD_BlockingIO;
+    thread->md.overlapped.data.mdThread = &thread->md;
+
+    if (thread->flags & _PR_GLOBAL_SCOPE) {
+        if (thread->flags & (_PR_PRIMORDIAL | _PR_ATTACHED)) {
+            /*
+            ** Warning:
+            ** --------
+            ** NSPR requires a real handle to every thread.
+            ** GetCurrentThread() returns a pseudo-handle which
+            ** is not suitable for some thread operations (e.g.,
+            ** suspending).  Therefore, get a real handle from
+            ** the pseudo handle via DuplicateHandle(...)
+            */
+            DuplicateHandle(
+                    GetCurrentProcess(),     /* Process of source handle */
+                    GetCurrentThread(),      /* Pseudo Handle to dup */
+                    GetCurrentProcess(),     /* Process of handle */
+                    &(thread->md.handle),    /* resulting handle */
+                    0L,                      /* access flags */
+                    FALSE,                   /* Inheritable */
+                    DUPLICATE_SAME_ACCESS);  /* Options */
+        }
+
+        /* Create the blocking IO semaphore */
+        thread->md.blocked_sema = CreateSemaphore(NULL, 0, 1, NULL);
+        if (thread->md.blocked_sema == NULL) {
+            return PR_FAILURE;
+        }
+		if (_native_threads_only) {
+			/* Create the blocking IO semaphore */
+			thread->md.thr_event = CreateEvent(NULL, TRUE, FALSE, NULL);
+			if (thread->md.thr_event == NULL) {
+				return PR_FAILURE;
+			}
+		}
+    }
+
+    return PR_SUCCESS;
+}
+
+static unsigned __stdcall
+pr_root(void *arg)
+{
+    PRThread *thread = (PRThread *)arg;
+    thread->md.start(thread);
+    return 0;
+}
+
+PRStatus 
+_PR_MD_CREATE_THREAD(PRThread *thread, 
+                  void (*start)(void *), 
+                  PRThreadPriority priority, 
+                  PRThreadScope scope, 
+                  PRThreadState state, 
+                  PRUint32 stackSize)
+{
+
+    thread->md.start = start;
+    thread->md.handle = (HANDLE) _beginthreadex(
+                    NULL,
+                    thread->stack->stackSize,
+                    pr_root,
+                    (void *)thread,
+                    CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
+                    &(thread->id));
+    if(!thread->md.handle) {
+        PRErrorCode prerror;
+        thread->md.fiber_last_error = GetLastError();
+        switch (errno) {
+            case ENOMEM:
+                prerror = PR_OUT_OF_MEMORY_ERROR;
+                break;
+            case EAGAIN:
+                prerror = PR_INSUFFICIENT_RESOURCES_ERROR;
+                break;
+            case EINVAL:
+                prerror = PR_INVALID_ARGUMENT_ERROR;
+                break;
+            default:
+                prerror = PR_UNKNOWN_ERROR;
+        }
+        PR_SetError(prerror, errno);
+        return PR_FAILURE;
+    }
+
+    thread->md.id = thread->id;
+    /*
+     * On windows, a thread is created with a thread priority of
+     * THREAD_PRIORITY_NORMAL.
+     */
+    if (priority != PR_PRIORITY_NORMAL) {
+        _PR_MD_SET_PRIORITY(&(thread->md), priority);
+    }
+
+    /* Activate the thread */
+    if ( ResumeThread( thread->md.handle ) != -1)
+        return PR_SUCCESS;
+
+    PR_SetError(PR_UNKNOWN_ERROR, GetLastError());
+    return PR_FAILURE;
+}
+
+void
+_PR_MD_JOIN_THREAD(_MDThread *md)
+{
+    DWORD rv;
+
+    rv = WaitForSingleObject(md->handle, INFINITE);
+    PR_ASSERT(WAIT_OBJECT_0 == rv);
+}
+
+void
+_PR_MD_END_THREAD(void)
+{
+    _endthreadex(0);
+}
+
+void    
+_PR_MD_YIELD(void)
+{
+    /* Can NT really yield at all? */
+    Sleep(0);
+}
+
+void     
+_PR_MD_SET_PRIORITY(_MDThread *thread, PRThreadPriority newPri)
+{
+    int nativePri;
+    BOOL rv;
+
+    if (newPri < PR_PRIORITY_FIRST) {
+        newPri = PR_PRIORITY_FIRST;
+    } else if (newPri > PR_PRIORITY_LAST) {
+        newPri = PR_PRIORITY_LAST;
+    }
+    switch (newPri) {
+        case PR_PRIORITY_LOW:
+            nativePri = THREAD_PRIORITY_BELOW_NORMAL;
+            break;
+        case PR_PRIORITY_NORMAL:
+            nativePri = THREAD_PRIORITY_NORMAL;
+            break;
+        case PR_PRIORITY_HIGH:
+            nativePri = THREAD_PRIORITY_ABOVE_NORMAL;
+            break;
+        case PR_PRIORITY_URGENT:
+            nativePri = THREAD_PRIORITY_HIGHEST;
+    }
+    rv = SetThreadPriority(thread->handle, nativePri);
+    PR_ASSERT(rv);
+    if (!rv) {
+	PR_LOG(_pr_thread_lm, PR_LOG_MIN,
+                ("PR_SetThreadPriority: can't set thread priority\n"));
+    }
+    return;
+}
+
+const DWORD MS_VC_EXCEPTION = 0x406D1388;
+
+#pragma pack(push,8)
+typedef struct tagTHREADNAME_INFO
+{
+   DWORD dwType; // Must be 0x1000.
+   LPCSTR szName; // Pointer to name (in user addr space).
+   DWORD dwThreadID; // Thread ID (-1=caller thread).
+   DWORD dwFlags; // Reserved for future use, must be zero.
+} THREADNAME_INFO;
+#pragma pack(pop)
+
+void
+_PR_MD_SET_CURRENT_THREAD_NAME(const char *name)
+{
+#ifdef _MSC_VER
+   THREADNAME_INFO info;
+
+   if (!IsDebuggerPresent())
+      return;
+
+   info.dwType = 0x1000;
+   info.szName = (char*) name;
+   info.dwThreadID = -1;
+   info.dwFlags = 0;
+
+   __try {
+      RaiseException(MS_VC_EXCEPTION,
+                     0,
+                     sizeof(info) / sizeof(ULONG_PTR),
+                     (ULONG_PTR*)&info);
+   } __except(EXCEPTION_CONTINUE_EXECUTION) {
+   }
+#endif
+}
+
+void
+_PR_MD_CLEAN_THREAD(PRThread *thread)
+{
+    BOOL rv;
+
+    if (thread->md.acceptex_buf) {
+        PR_DELETE(thread->md.acceptex_buf);
+    }
+
+    if (thread->md.xmit_bufs) {
+        PR_DELETE(thread->md.xmit_bufs);
+    }
+
+    if (thread->md.blocked_sema) {
+        rv = CloseHandle(thread->md.blocked_sema);
+        PR_ASSERT(rv);
+        thread->md.blocked_sema = 0;
+    }
+	if (_native_threads_only) {
+		if (thread->md.thr_event) {
+			rv = CloseHandle(thread->md.thr_event);
+			PR_ASSERT(rv);
+			thread->md.thr_event = 0;
+		}
+	}
+
+    if (thread->md.handle) {
+        rv = CloseHandle(thread->md.handle);
+        PR_ASSERT(rv);
+        thread->md.handle = 0;
+    }
+
+    /* Don't call DeleteFiber on current fiber or we'll kill the whole thread.
+     * Don't call free(thread) until we've switched off the thread.
+     * So put this fiber (or thread) on a list to be deleted by the idle
+     * fiber next time we have a chance.
+     */
+    if (!(thread->flags & (_PR_ATTACHED|_PR_GLOBAL_SCOPE))) {
+        _MD_LOCK(&_nt_idleLock);
+        _nt_idleCount++;
+        PR_APPEND_LINK(&thread->links, &_nt_idleList);
+        _MD_UNLOCK(&_nt_idleLock);
+    }
+}
+
+void
+_PR_MD_EXIT_THREAD(PRThread *thread)
+{
+    BOOL rv;
+
+    if (thread->md.acceptex_buf) {
+        PR_DELETE(thread->md.acceptex_buf);
+    }
+
+    if (thread->md.xmit_bufs) {
+        PR_DELETE(thread->md.xmit_bufs);
+    }
+
+    if (thread->md.blocked_sema) {
+        rv = CloseHandle(thread->md.blocked_sema);
+        PR_ASSERT(rv);
+        thread->md.blocked_sema = 0;
+    }
+
+	if (_native_threads_only) {
+		if (thread->md.thr_event) {
+			rv = CloseHandle(thread->md.thr_event);
+			PR_ASSERT(rv);
+			thread->md.thr_event = 0;
+		}
+	}
+
+    if (thread->md.handle) {
+        rv = CloseHandle(thread->md.handle);
+        PR_ASSERT(rv);
+        thread->md.handle = 0;
+    }
+
+    if (thread->flags & _PR_GLOBAL_SCOPE) {
+        _MD_SET_CURRENT_THREAD(NULL);
+    }
+}
+
+
+void
+_PR_MD_EXIT(PRIntn status)
+{
+    _exit(status);
+}
+
+#ifdef HAVE_FIBERS
+
+void
+_pr_fiber_mainline(void *unused) 
+{
+    PRThread *fiber = _PR_MD_CURRENT_THREAD();
+
+    POST_SWITCH_WORK();
+
+    fiber->md.fiber_fn(fiber->md.fiber_arg);
+}
+
+PRThread *_PR_MD_CREATE_USER_THREAD(
+    PRUint32 stacksize, void (*start)(void *), void *arg)
+{
+    PRThread *thread;
+
+    if ( (thread = PR_NEW(PRThread)) == NULL ) {
+        return NULL;
+    }
+    
+    memset(thread, 0, sizeof(PRThread));
+    thread->md.fiber_fn = start;
+    thread->md.fiber_arg = arg;
+    thread->md.fiber_stacksize = stacksize;
+    return thread;
+}
+
+void
+_PR_MD_CREATE_PRIMORDIAL_USER_THREAD(PRThread *thread)
+{
+    thread->md.fiber_id = ConvertThreadToFiber(NULL);
+    PR_ASSERT(thread->md.fiber_id);
+    _MD_SET_CURRENT_THREAD(thread);
+    _MD_SET_LAST_THREAD(thread);
+    thread->no_sched = 1;
+    return;
+}
+
+void
+_PR_MD_INIT_CONTEXT(PRThread *thread, char *top, void (*start) (void), PRBool *status)
+{
+    thread->md.fiber_fn = (void (*)(void *))start;
+    thread->md.fiber_id = CreateFiber(thread->md.fiber_stacksize, 
+        (LPFIBER_START_ROUTINE)_pr_fiber_mainline, NULL);
+    if (thread->md.fiber_id != 0)
+        *status = PR_TRUE;
+    else {
+        DWORD oserror = GetLastError();
+        PRErrorCode prerror;
+        if (oserror == ERROR_NOT_ENOUGH_MEMORY) {
+            prerror = PR_OUT_OF_MEMORY_ERROR;
+        } else {
+            prerror = PR_UNKNOWN_ERROR;
+        }
+        PR_SetError(prerror, oserror);
+        *status = PR_FALSE;
+    }
+}
+
+void
+_PR_MD_SWITCH_CONTEXT(PRThread *thread)
+{
+    PR_ASSERT( !_PR_IS_NATIVE_THREAD(thread) );
+
+    thread->md.fiber_last_error = GetLastError();
+    _PR_Schedule();
+}
+
+void
+_PR_MD_RESTORE_CONTEXT(PRThread *thread)
+{
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    PR_ASSERT( !_PR_IS_NATIVE_THREAD(thread) );
+
+    /* The user-level code for yielding will happily add ourselves to the runq
+     * and then switch to ourselves; the NT fibers can't handle switching to 
+     * ourselves.
+     */
+    if (thread != me) {
+        SetLastError(thread->md.fiber_last_error);
+        _MD_SET_CURRENT_THREAD(thread);
+        _PR_MD_SET_LAST_THREAD(me);
+        thread->no_sched = 1;
+        SwitchToFiber(thread->md.fiber_id);
+        POST_SWITCH_WORK();
+    }
+}
+
+
+#endif /* HAVE_FIBERS */
+
+PRInt32 _PR_MD_SETTHREADAFFINITYMASK(PRThread *thread, PRUint32 mask )
+{
+    int rv;
+
+    rv = SetThreadAffinityMask(thread->md.handle, mask);
+
+    return rv?0:-1;
+}
+
+PRInt32 _PR_MD_GETTHREADAFFINITYMASK(PRThread *thread, PRUint32 *mask)
+{
+    PRInt32 rv, system_mask;
+
+    rv = GetProcessAffinityMask(GetCurrentProcess(), mask, &system_mask);
+    
+    return rv?0:-1;
+}
+
+void 
+_PR_MD_SUSPEND_CPU(_PRCPU *cpu) 
+{
+    _PR_MD_SUSPEND_THREAD(cpu->thread);
+}
+
+void
+_PR_MD_RESUME_CPU(_PRCPU *cpu)
+{
+    _PR_MD_RESUME_THREAD(cpu->thread);
+}
+
+void
+_PR_MD_SUSPEND_THREAD(PRThread *thread)
+{
+    if (_PR_IS_NATIVE_THREAD(thread)) {
+        /*
+        ** There seems to be some doubt about whether or not SuspendThread
+        ** is a synchronous function. The test afterwards is to help veriry
+        ** that it is, which is what Microsoft says it is.
+        */
+        PRUintn rv = SuspendThread(thread->md.handle);
+        PR_ASSERT(0xffffffffUL != rv);
+    }
+}
+
+void
+_PR_MD_RESUME_THREAD(PRThread *thread)
+{
+    if (_PR_IS_NATIVE_THREAD(thread)) {
+        ResumeThread(thread->md.handle);
+    }
+}
+
+PRThread*
+_MD_CURRENT_THREAD(void)
+{
+PRThread *thread;
+
+	thread = _MD_GET_ATTACHED_THREAD();
+
+   	if (NULL == thread) {
+		thread = _PRI_AttachThread(
+            PR_USER_THREAD, PR_PRIORITY_NORMAL, NULL, 0);
+	}
+	PR_ASSERT(thread != NULL);
+	return thread;
+}
+
diff --git a/nsprpub/pr/src/md/windows/objs.mk b/nsprpub/pr/src/md/windows/objs.mk
new file mode 100644
index 000000000..89f022e8a
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/objs.mk
@@ -0,0 +1,48 @@
+# 
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+ifeq ($(OS_TARGET),WINNT)
+CSRCS = ntmisc.c \
+	ntsec.c \
+	ntsem.c \
+	ntinrval.c \
+	ntgc.c \
+	ntio.c \
+	ntthread.c \
+	ntdllmn.c \
+	win32_errors.c \
+	w32ipcsem.c \
+	w32poll.c \
+	w32rng.c \
+	w32shm.c
+else
+ifeq (,$(filter-out WIN95 WINCE WINMO, $(OS_TARGET)))
+CSRCS =	ntmisc.c \
+	ntsec.c \
+	ntsem.c \
+	ntinrval.c \
+	ntgc.c \
+	w95thred.c \
+	w95io.c \
+	w95cv.c \
+	w95sock.c \
+	win32_errors.c \
+	w32ipcsem.c \
+	w32poll.c \
+	w32rng.c \
+	w32shm.c \
+	w95dllmain.c
+else
+endif # win95
+endif # winnt
+
+CSRCS	+= $(PR_MD_CSRCS)
+ASFILES += $(PR_MD_ASFILES)
+
+OBJS += $(addprefix md/windows/$(OBJDIR)/,$(CSRCS:.c=.$(OBJ_SUFFIX)))  \
+	$(addprefix md/windows/$(OBJDIR)/,$(ASFILES:.s=.$(OBJ_SUFFIX)))
+
+
diff --git a/nsprpub/pr/src/md/windows/w32ipcsem.c b/nsprpub/pr/src/md/windows/w32ipcsem.c
new file mode 100644
index 000000000..954591002
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/w32ipcsem.c
@@ -0,0 +1,228 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * File: w32ipcsem.c
+ * Description: implements named semaphores for NT and WIN95.
+ */
+
+#include "primpl.h"
+
+#ifdef WINCE
+static HANDLE OpenSemaphore(DWORD inDesiredAccess,
+                            BOOL inInheritHandle,
+                            const char *inName)
+{
+    HANDLE retval = NULL;
+    HANDLE semaphore = NULL;
+    PRUnichar wideName[MAX_PATH];  /* name size is limited to MAX_PATH */
+    
+    MultiByteToWideChar(CP_ACP, 0, inName, -1, wideName, MAX_PATH);
+    /* 0x7fffffff is the max count for our semaphore */
+    semaphore = CreateSemaphoreW(NULL, 0, 0x7fffffff, wideName);
+    if (NULL != semaphore) {
+        DWORD lastErr = GetLastError();
+      
+        if (ERROR_ALREADY_EXISTS != lastErr)
+            CloseHandle(semaphore);
+        else
+            retval = semaphore;
+    }
+    return retval;
+}
+#endif
+
+/*
+ * NSPR-to-NT access right mapping table for semaphore objects.
+ *
+ * The SYNCHRONIZE access is required by WaitForSingleObject.
+ * The SEMAPHORE_MODIFY_STATE access is required by ReleaseSemaphore.
+ * The OR of these three access masks must equal SEMAPHORE_ALL_ACCESS.
+ * This is because if a semaphore object with the specified name
+ * exists, CreateSemaphore requests SEMAPHORE_ALL_ACCESS access to
+ * the existing object.
+ */
+static DWORD semAccessTable[] = {
+    STANDARD_RIGHTS_REQUIRED|0x1, /* read (0x1 is "query state") */
+    STANDARD_RIGHTS_REQUIRED|SYNCHRONIZE|SEMAPHORE_MODIFY_STATE, /* write */
+    0 /* execute */
+};
+
+#ifndef _PR_GLOBAL_THREADS_ONLY
+
+/*
+ * A fiber cannot call WaitForSingleObject because that
+ * will block the other fibers running on the same thread.
+ * If a fiber needs to wait on a (semaphore) handle, we
+ * create a native thread to call WaitForSingleObject and
+ * have the fiber join the native thread.
+ */
+
+/*
+ * Arguments, return value, and error code for WaitForSingleObject
+ */
+struct WaitSingleArg {
+    HANDLE handle;
+    DWORD timeout;
+    DWORD rv;
+    DWORD error;
+};
+
+static void WaitSingleThread(void *arg)
+{
+    struct WaitSingleArg *warg = (struct WaitSingleArg *) arg;
+
+    warg->rv = WaitForSingleObject(warg->handle, warg->timeout);
+    if (warg->rv == WAIT_FAILED) {
+        warg->error = GetLastError();
+    }
+}
+
+static DWORD FiberSafeWaitForSingleObject(
+    HANDLE hHandle,
+    DWORD dwMilliseconds
+)
+{
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    if (_PR_IS_NATIVE_THREAD(me)) {
+        return WaitForSingleObject(hHandle, dwMilliseconds);
+    } else {
+        PRThread *waitThread;
+        struct WaitSingleArg warg;
+        PRStatus rv;
+
+        warg.handle = hHandle;
+        warg.timeout = dwMilliseconds;
+        waitThread = PR_CreateThread(
+            PR_USER_THREAD, WaitSingleThread, &warg,
+            PR_PRIORITY_NORMAL, PR_GLOBAL_THREAD, PR_JOINABLE_THREAD, 0);
+        if (waitThread == NULL) {
+            return WAIT_FAILED;
+        }
+
+        rv = PR_JoinThread(waitThread);
+        PR_ASSERT(rv == PR_SUCCESS);
+        if (rv == PR_FAILURE) {
+            return WAIT_FAILED;
+        }
+        if (warg.rv == WAIT_FAILED) {
+            SetLastError(warg.error);
+        }
+        return warg.rv;
+    }
+}
+
+#endif /* !_PR_GLOBAL_THREADS_ONLY */
+
+PRSem *_PR_MD_OPEN_SEMAPHORE(
+    const char *osname, PRIntn flags, PRIntn mode, PRUintn value)
+{
+    PRSem *sem;
+    SECURITY_ATTRIBUTES sa;
+    LPSECURITY_ATTRIBUTES lpSA = NULL;
+    PSECURITY_DESCRIPTOR pSD = NULL;
+    PACL pACL = NULL;
+
+    sem = PR_NEW(PRSem);
+    if (sem == NULL) {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+        return NULL;
+    }
+    if (flags & PR_SEM_CREATE) {
+        if (_PR_NT_MakeSecurityDescriptorACL(mode, semAccessTable,
+                &pSD, &pACL) == PR_SUCCESS) {
+            sa.nLength = sizeof(sa);
+            sa.lpSecurityDescriptor = pSD;
+            sa.bInheritHandle = FALSE;
+            lpSA = &sa;
+        }
+#ifdef WINCE
+        {
+            /* The size of a sem's name is limited to MAX_PATH. */
+            PRUnichar wosname[MAX_PATH]; 
+            MultiByteToWideChar(CP_ACP, 0, osname, -1, wosname, MAX_PATH);
+            sem->sem = CreateSemaphoreW(lpSA, value, 0x7fffffff, wosname);
+        }
+#else
+        sem->sem = CreateSemaphoreA(lpSA, value, 0x7fffffff, osname);
+#endif
+        if (lpSA != NULL) {
+            _PR_NT_FreeSecurityDescriptorACL(pSD, pACL);
+        }
+        if (sem->sem == NULL) {
+            _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+            PR_DELETE(sem);
+            return NULL;
+        }
+        if ((flags & PR_SEM_EXCL) && (GetLastError() == ERROR_ALREADY_EXISTS)) {
+            PR_SetError(PR_FILE_EXISTS_ERROR, ERROR_ALREADY_EXISTS);
+            CloseHandle(sem->sem);
+            PR_DELETE(sem);
+            return NULL;
+        }
+    } else {
+        sem->sem = OpenSemaphore(
+                SEMAPHORE_MODIFY_STATE|SYNCHRONIZE, FALSE, osname);
+        if (sem->sem == NULL) {
+            DWORD err = GetLastError();
+
+            /*
+             * If we open a nonexistent named semaphore, NT
+             * returns ERROR_FILE_NOT_FOUND, while Win95
+             * returns ERROR_INVALID_NAME
+             */
+            if (err == ERROR_INVALID_NAME) {
+                PR_SetError(PR_FILE_NOT_FOUND_ERROR, err);
+            } else {
+                _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+            }
+            PR_DELETE(sem);
+            return NULL;
+        }
+    }
+    return sem;
+}
+
+PRStatus _PR_MD_WAIT_SEMAPHORE(PRSem *sem)
+{
+    DWORD rv;
+
+#ifdef _PR_GLOBAL_THREADS_ONLY
+    rv = WaitForSingleObject(sem->sem, INFINITE);
+#else
+    rv = FiberSafeWaitForSingleObject(sem->sem, INFINITE);
+#endif
+    PR_ASSERT(rv == WAIT_FAILED || rv == WAIT_OBJECT_0);
+    if (rv == WAIT_FAILED) {
+        _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+        return PR_FAILURE;
+    }
+    if (rv != WAIT_OBJECT_0) {
+        /* Should not happen */
+        PR_SetError(PR_UNKNOWN_ERROR, 0);
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}
+
+PRStatus _PR_MD_POST_SEMAPHORE(PRSem *sem)
+{
+    if (ReleaseSemaphore(sem->sem, 1, NULL) == FALSE) {
+        _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+}
+
+PRStatus _PR_MD_CLOSE_SEMAPHORE(PRSem *sem)
+{
+    if (CloseHandle(sem->sem) == FALSE) {
+        _PR_MD_MAP_CLOSE_ERROR(GetLastError());
+        return PR_FAILURE;
+    }
+    PR_DELETE(sem);
+    return PR_SUCCESS;
+}
diff --git a/nsprpub/pr/src/md/windows/w32poll.c b/nsprpub/pr/src/md/windows/w32poll.c
new file mode 100644
index 000000000..84100763b
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/w32poll.c
@@ -0,0 +1,326 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * This file implements _PR_MD_PR_POLL for Win32.
+ */
+
+/* The default value of FD_SETSIZE is 64. */
+#define FD_SETSIZE 1024
+
+#include "primpl.h"
+
+#if !defined(_PR_GLOBAL_THREADS_ONLY)
+
+struct select_data_s {
+    PRInt32 status;
+    PRInt32 error;
+    fd_set *rd, *wt, *ex;
+    const struct timeval *tv;
+};
+
+static void
+_PR_MD_select_thread(void *cdata)
+{
+    struct select_data_s *cd = (struct select_data_s *)cdata;
+
+    cd->status = select(0, cd->rd, cd->wt, cd->ex, cd->tv);
+
+    if (cd->status == SOCKET_ERROR) {
+        cd->error = WSAGetLastError();
+    }
+}
+
+int _PR_NTFiberSafeSelect(
+    int nfds,
+    fd_set *readfds,
+    fd_set *writefds,
+    fd_set *exceptfds,
+    const struct timeval *timeout)
+{
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    int ready;
+
+    if (_PR_IS_NATIVE_THREAD(me)) {
+        ready = _MD_SELECT(nfds, readfds, writefds, exceptfds, timeout);
+    }
+    else
+    {
+        /*
+        ** Creating a new thread on each call!!
+        ** I guess web server doesn't use non-block I/O.
+        */
+        PRThread *selectThread;
+        struct select_data_s data;
+        data.status = 0;
+        data.error = 0;
+        data.rd = readfds;
+        data.wt = writefds;
+        data.ex = exceptfds;
+        data.tv = timeout;
+
+        selectThread = PR_CreateThread(
+            PR_USER_THREAD, _PR_MD_select_thread, &data,
+            PR_PRIORITY_NORMAL, PR_GLOBAL_THREAD, PR_JOINABLE_THREAD, 0);
+        if (selectThread == NULL) return -1;
+
+        PR_JoinThread(selectThread);
+        ready = data.status;
+        if (ready == SOCKET_ERROR) WSASetLastError(data.error);
+    }
+    return ready;
+}
+
+#endif /* !defined(_PR_GLOBAL_THREADS_ONLY) */
+
+PRInt32 _PR_MD_PR_POLL(PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
+{
+    int ready, err;
+    fd_set rd, wt, ex;
+    fd_set *rdp, *wtp, *exp;
+    int nrd, nwt, nex;
+    PRFileDesc *bottom;
+    PRPollDesc *pd, *epd;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+
+    struct timeval tv, *tvp = NULL;
+
+    if (_PR_PENDING_INTERRUPT(me))
+    {
+        me->flags &= ~_PR_INTERRUPT;
+        PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+        return -1;
+    }
+
+    /*
+    ** Is it an empty set? If so, just sleep for the timeout and return
+    */
+    if (0 == npds)
+    {
+        PR_Sleep(timeout);
+        return 0;
+    }
+
+    nrd = nwt = nex = 0;
+    FD_ZERO(&rd);
+    FD_ZERO(&wt);
+    FD_ZERO(&ex);
+
+    ready = 0;
+    for (pd = pds, epd = pd + npds; pd < epd; pd++)
+    {
+        SOCKET osfd;
+        PRInt16 in_flags_read = 0, in_flags_write = 0;
+        PRInt16 out_flags_read = 0, out_flags_write = 0;
+
+        if ((NULL != pd->fd) && (0 != pd->in_flags))
+        {
+            if (pd->in_flags & PR_POLL_READ)
+            {
+                in_flags_read = (pd->fd->methods->poll)(
+                    pd->fd, (PRInt16)(pd->in_flags & ~PR_POLL_WRITE),
+                    &out_flags_read);
+            }
+            if (pd->in_flags & PR_POLL_WRITE)
+            {
+                in_flags_write = (pd->fd->methods->poll)(
+                    pd->fd, (PRInt16)(pd->in_flags & ~PR_POLL_READ),
+                    &out_flags_write);
+            }
+            if ((0 != (in_flags_read & out_flags_read))
+            || (0 != (in_flags_write & out_flags_write)))
+            {
+                /* this one's ready right now (buffered input) */
+                if (0 == ready)
+                {
+                    /*
+                     * We will have to return without calling the
+                     * system poll/select function.  So zero the
+                     * out_flags fields of all the poll descriptors
+                     * before this one.
+                     */
+                    PRPollDesc *prev;
+                    for (prev = pds; prev < pd; prev++)
+                    {
+                        prev->out_flags = 0;
+                    }
+                }
+                ready += 1;
+                pd->out_flags = out_flags_read | out_flags_write;
+            }
+            else
+            {
+                pd->out_flags = 0;  /* pre-condition */
+                /* make sure this is an NSPR supported stack */
+                bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+                // ignore a socket without PR_NSPR_IO_LAYER available.
+
+                if ((NULL != bottom)
+                && (_PR_FILEDESC_OPEN == bottom->secret->state))
+                {
+                    if (0 == ready)
+                    {
+                        osfd = (SOCKET) bottom->secret->md.osfd;
+                        if (in_flags_read & PR_POLL_READ)
+                        {
+                            pd->out_flags |= _PR_POLL_READ_SYS_READ;
+                            FD_SET(osfd, &rd);
+                            nrd++;
+                        }
+                        if (in_flags_read & PR_POLL_WRITE)
+                        {
+                            pd->out_flags |= _PR_POLL_READ_SYS_WRITE;
+                            FD_SET(osfd, &wt);
+                            nwt++;
+                        }
+                        if (in_flags_write & PR_POLL_READ)
+                        {
+                            pd->out_flags |= _PR_POLL_WRITE_SYS_READ;
+                            FD_SET(osfd, &rd);
+                            nrd++;
+                        }
+                        if (in_flags_write & PR_POLL_WRITE)
+                        {
+                            pd->out_flags |= _PR_POLL_WRITE_SYS_WRITE;
+                            FD_SET(osfd, &wt);
+                            nwt++;
+                        }
+                        if (pd->in_flags & PR_POLL_EXCEPT) {
+                            FD_SET(osfd, &ex);
+                            nex++;
+                        }
+                    }
+                }
+                else
+                {
+                    if (0 == ready)
+                    {
+                        PRPollDesc *prev;
+                        for (prev = pds; prev < pd; prev++)
+                        {
+                            prev->out_flags = 0;
+                        }
+                    }
+                    ready += 1;  /* this will cause an abrupt return */
+                    pd->out_flags = PR_POLL_NVAL;  /* bogii */
+                }
+            }
+        }
+        else
+        {
+            pd->out_flags = 0;
+        }
+    }
+
+    if (0 != ready) return ready;  /* no need to block */
+
+    /*
+     * FD_SET does nothing if the fd_set's internal fd_array is full.  If
+     * nrd, nwt, or nex is greater than FD_SETSIZE, we know FD_SET must
+     * have failed to insert an osfd into the corresponding fd_set, and
+     * therefore we should fail.
+     */
+    if ((nrd > FD_SETSIZE) || (nwt > FD_SETSIZE) || (nex > FD_SETSIZE)) {
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+        return -1;
+    }
+
+    rdp = (0 == nrd) ? NULL : &rd;
+    wtp = (0 == nwt) ? NULL : &wt;
+    exp = (0 == nex) ? NULL : &ex;
+
+    if ((NULL == rdp) && (NULL == wtp) && (NULL == exp)) {
+        PR_Sleep(timeout);
+        return 0;
+    }
+
+    if (timeout != PR_INTERVAL_NO_TIMEOUT)
+    {
+        PRInt32 ticksPerSecond = PR_TicksPerSecond();
+        tv.tv_sec = timeout / ticksPerSecond;
+        tv.tv_usec = PR_IntervalToMicroseconds( timeout % ticksPerSecond );
+        tvp = &tv;
+    }
+
+#if defined(_PR_GLOBAL_THREADS_ONLY)
+    ready = _MD_SELECT(0, rdp, wtp, exp, tvp);
+#else
+    ready = _PR_NTFiberSafeSelect(0, rdp, wtp, exp, tvp);
+#endif
+
+    /*
+    ** Now to unravel the select sets back into the client's poll
+    ** descriptor list. Is this possibly an area for pissing away
+    ** a few cycles or what?
+    */
+    if (ready > 0)
+    {
+        ready = 0;
+        for (pd = pds, epd = pd + npds; pd < epd; pd++)
+        {
+            PRInt16 out_flags = 0;
+            if ((NULL != pd->fd) && (0 != pd->in_flags))
+            {
+                SOCKET osfd;
+                bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+                PR_ASSERT(NULL != bottom);
+
+                osfd = (SOCKET) bottom->secret->md.osfd;
+
+                if (FD_ISSET(osfd, &rd))
+                {
+                    if (pd->out_flags & _PR_POLL_READ_SYS_READ)
+                        out_flags |= PR_POLL_READ;
+                    if (pd->out_flags & _PR_POLL_WRITE_SYS_READ)
+                        out_flags |= PR_POLL_WRITE;
+                } 
+                if (FD_ISSET(osfd, &wt))
+                {
+                    if (pd->out_flags & _PR_POLL_READ_SYS_WRITE)
+                        out_flags |= PR_POLL_READ;
+                    if (pd->out_flags & _PR_POLL_WRITE_SYS_WRITE)
+                        out_flags |= PR_POLL_WRITE;
+                } 
+                if (FD_ISSET(osfd, &ex)) out_flags |= PR_POLL_EXCEPT;
+            }
+            pd->out_flags = out_flags;
+            if (out_flags) ready++;
+        }
+        PR_ASSERT(ready > 0);
+    }
+    else if (ready == SOCKET_ERROR)
+    {
+        err = WSAGetLastError();
+        if (err == WSAENOTSOCK)
+        {
+            /* Find the bad fds */
+            int optval;
+            int optlen = sizeof(optval);
+            ready = 0;
+            for (pd = pds, epd = pd + npds; pd < epd; pd++)
+            {
+                pd->out_flags = 0;
+                if ((NULL != pd->fd) && (0 != pd->in_flags))
+                {
+                    bottom = PR_GetIdentitiesLayer(pd->fd, PR_NSPR_IO_LAYER);
+                    if (getsockopt(bottom->secret->md.osfd, SOL_SOCKET,
+                        SO_TYPE, (char *) &optval, &optlen) == -1)
+                    {
+                        PR_ASSERT(WSAGetLastError() == WSAENOTSOCK);
+                        if (WSAGetLastError() == WSAENOTSOCK)
+                        {
+                            pd->out_flags = PR_POLL_NVAL;
+                            ready++;
+                        }
+                    }
+                }
+            }
+            PR_ASSERT(ready > 0);
+        }
+        else _PR_MD_MAP_SELECT_ERROR(err);
+    }
+
+    return ready;
+}
diff --git a/nsprpub/pr/src/md/windows/w32rng.c b/nsprpub/pr/src/md/windows/w32rng.c
new file mode 100644
index 000000000..633ae0da5
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/w32rng.c
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <windows.h>
+#include <time.h>
+#include <io.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <primpl.h>
+
+static BOOL
+CurrentClockTickTime(LPDWORD lpdwHigh, LPDWORD lpdwLow)
+{
+    LARGE_INTEGER   liCount;
+
+    if (!QueryPerformanceCounter(&liCount))
+        return FALSE;
+
+    *lpdwHigh = liCount.u.HighPart;
+    *lpdwLow = liCount.u.LowPart;
+    return TRUE;
+}
+
+extern PRSize _PR_MD_GetRandomNoise( void *buf, PRSize size )
+{
+    DWORD   dwHigh, dwLow, dwVal;
+    size_t  n = 0;
+    size_t  nBytes;
+    time_t  sTime;
+
+    if (size <= 0)
+        return 0;
+
+    CurrentClockTickTime(&dwHigh, &dwLow);
+
+    // get the maximally changing bits first
+    nBytes = sizeof(dwLow) > size ? size : sizeof(dwLow);
+    memcpy((char *)buf, &dwLow, nBytes);
+    n += nBytes;
+    size -= nBytes;
+
+    if (size <= 0)
+        return n;
+
+    nBytes = sizeof(dwHigh) > size ? size : sizeof(dwHigh);
+    memcpy(((char *)buf) + n, &dwHigh, nBytes);
+    n += nBytes;
+    size -= nBytes;
+
+    if (size <= 0)
+        return n;
+
+    // get the number of milliseconds that have elapsed since Windows started
+    dwVal = GetTickCount();
+
+    nBytes = sizeof(dwVal) > size ? size : sizeof(dwVal);
+    memcpy(((char *)buf) + n, &dwVal, nBytes);
+    n += nBytes;
+    size -= nBytes;
+
+    if (size <= 0)
+        return n;
+
+    // get the time in seconds since midnight Jan 1, 1970
+    time(&sTime);
+    nBytes = sizeof(sTime) > size ? size : sizeof(sTime);
+    memcpy(((char *)buf) + n, &sTime, nBytes);
+    n += nBytes;
+
+    return n;
+}
+
diff --git a/nsprpub/pr/src/md/windows/w32shm.c b/nsprpub/pr/src/md/windows/w32shm.c
new file mode 100644
index 000000000..8e8b1d684
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/w32shm.c
@@ -0,0 +1,347 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <private/primpl.h>       
+#include <string.h>
+#include <prshm.h>
+#include <prerr.h>
+#include <prmem.h>
+
+#if defined(PR_HAVE_WIN32_NAMED_SHARED_MEMORY)
+
+extern PRLogModuleInfo *_pr_shm_lm;
+
+/*
+ * NSPR-to-NT access right mapping table for file-mapping objects.
+ *
+ * The OR of these three access masks must equal FILE_MAP_ALL_ACCESS.
+ * This is because if a file-mapping object with the specified name
+ * exists, CreateFileMapping requests full access to the existing
+ * object.
+ */
+static DWORD filemapAccessTable[] = {
+    FILE_MAP_ALL_ACCESS & ~FILE_MAP_WRITE, /* read */
+    FILE_MAP_ALL_ACCESS & ~FILE_MAP_READ, /* write */ 
+    0  /* execute */
+};
+
+extern PRSharedMemory * _MD_OpenSharedMemory( 
+        const char *name,
+        PRSize      size,
+        PRIntn      flags,
+        PRIntn      mode
+)
+{
+    char        ipcname[PR_IPC_NAME_SIZE];
+    PRStatus    rc = PR_SUCCESS;
+    DWORD dwHi, dwLo;
+    PRSharedMemory *shm;
+    DWORD flProtect = ( PAGE_READWRITE );
+    SECURITY_ATTRIBUTES sa;
+    LPSECURITY_ATTRIBUTES lpSA = NULL;
+    PSECURITY_DESCRIPTOR pSD = NULL;
+    PACL pACL = NULL;
+
+    rc = _PR_MakeNativeIPCName( name, ipcname, PR_IPC_NAME_SIZE, _PRIPCShm );
+    if ( PR_FAILURE == rc )
+    {
+        PR_SetError(PR_UNKNOWN_ERROR, 0 );
+        PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: name is invalid")); 
+        return(NULL);
+    }
+
+    shm = PR_NEWZAP( PRSharedMemory );
+    if ( NULL == shm ) 
+    {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0 );
+        PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: New PRSharedMemory out of memory")); 
+        return(NULL);
+    }
+
+    shm->ipcname = PR_MALLOC( (PRUint32) (strlen( ipcname ) + 1) );
+    if ( NULL == shm->ipcname )
+    {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0 );
+        PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, ( "PR_OpenSharedMemory: New shm->ipcname out of memory")); 
+        PR_DELETE(shm);
+        return(NULL);
+    }
+
+    /* copy args to struct */
+    strcpy( shm->ipcname, ipcname );
+    shm->size = size; 
+    shm->mode = mode;
+    shm->flags = flags;
+    shm->ident = _PR_SHM_IDENT;
+
+    if (flags & PR_SHM_CREATE ) {
+        dwHi = (DWORD) (((PRUint64) shm->size >> 32) & 0xffffffff);
+        dwLo = (DWORD) (shm->size & 0xffffffff);
+
+        if (_PR_NT_MakeSecurityDescriptorACL(mode, filemapAccessTable,
+                &pSD, &pACL) == PR_SUCCESS) {
+            sa.nLength = sizeof(sa);
+            sa.lpSecurityDescriptor = pSD;
+            sa.bInheritHandle = FALSE;
+            lpSA = &sa;
+        }
+#ifdef WINCE
+        {
+            /*
+             * This is assuming that the name will never be larger than
+             * MAX_PATH.  Should we dynamically allocate?
+             */
+            PRUnichar wideIpcName[MAX_PATH];
+            MultiByteToWideChar(CP_ACP, 0, shm->ipcname, -1,
+                                wideIpcName, MAX_PATH);
+            shm->handle = CreateFileMappingW(
+                (HANDLE)-1 ,
+                lpSA,
+                flProtect,
+                dwHi,
+                dwLo,
+                wideIpcName);
+        }
+#else
+        shm->handle = CreateFileMappingA(
+            (HANDLE)-1 ,
+            lpSA,
+            flProtect,
+            dwHi,
+            dwLo,
+            shm->ipcname);
+#endif
+        if (lpSA != NULL) {
+            _PR_NT_FreeSecurityDescriptorACL(pSD, pACL);
+        }
+
+        if ( NULL == shm->handle ) {
+            PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, 
+                ( "PR_OpenSharedMemory: CreateFileMapping() failed: %s",
+                    shm->ipcname )); 
+            _PR_MD_MAP_DEFAULT_ERROR( GetLastError());
+            PR_FREEIF( shm->ipcname )
+            PR_DELETE( shm );
+            return(NULL);
+        } else {
+            if (( flags & PR_SHM_EXCL) && ( GetLastError() == ERROR_ALREADY_EXISTS ))  {
+                PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, 
+                    ( "PR_OpenSharedMemory: Request exclusive & already exists",
+                        shm->ipcname )); 
+                PR_SetError( PR_FILE_EXISTS_ERROR, ERROR_ALREADY_EXISTS );
+                CloseHandle( shm->handle );
+                PR_FREEIF( shm->ipcname )
+                PR_DELETE( shm );
+                return(NULL);
+            } else {
+                PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, 
+                    ( "PR_OpenSharedMemory: CreateFileMapping() success: %s, handle: %d",
+                        shm->ipcname, shm->handle ));
+                return(shm);
+            }
+        }
+    } else {
+#ifdef WINCE
+        PR_SetError( PR_NOT_IMPLEMENTED_ERROR, 0 );
+        shm->handle = NULL;  /* OpenFileMapping not supported */
+#else
+        shm->handle = OpenFileMapping( FILE_MAP_WRITE, TRUE, shm->ipcname );
+#endif
+        if ( NULL == shm->handle ) {
+            _PR_MD_MAP_DEFAULT_ERROR( GetLastError());
+            PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, 
+                ( "PR_OpenSharedMemory: OpenFileMapping() failed: %s, error: %d",
+                    shm->ipcname, PR_GetOSError())); 
+            PR_FREEIF( shm->ipcname );
+            PR_DELETE( shm );
+            return(NULL);
+        } else {
+            PR_LOG(_pr_shm_lm, PR_LOG_DEBUG, 
+                ( "PR_OpenSharedMemory: OpenFileMapping() success: %s, handle: %d",
+                    shm->ipcname, shm->handle )); 
+                return(shm);
+        }
+    }
+    /* returns from separate paths */
+}
+
+extern void * _MD_AttachSharedMemory( PRSharedMemory *shm, PRIntn flags )
+{
+    PRUint32    access = FILE_MAP_WRITE;
+    void        *addr;
+
+    PR_ASSERT( shm->ident == _PR_SHM_IDENT );
+
+    if ( PR_SHM_READONLY & flags )
+        access = FILE_MAP_READ;
+
+    addr = MapViewOfFile( shm->handle,
+        access,
+        0, 0,
+        shm->size );
+
+    if ( NULL == addr ) {
+        _PR_MD_MAP_DEFAULT_ERROR( GetLastError());
+        PR_LOG( _pr_shm_lm, PR_LOG_ERROR, 
+            ("_MD_AttachSharedMemory: MapViewOfFile() failed. OSerror: %d", PR_GetOSError()));
+    }
+
+    return( addr );
+} /* end _MD_ATTACH_SHARED_MEMORY() */
+
+
+extern PRStatus _MD_DetachSharedMemory( PRSharedMemory *shm, void *addr )
+{
+    PRStatus rc = PR_SUCCESS;
+    BOOL        wrc;
+
+    PR_ASSERT( shm->ident == _PR_SHM_IDENT );
+
+    wrc = UnmapViewOfFile( addr );
+    if ( FALSE == wrc ) 
+    {
+        _PR_MD_MAP_DEFAULT_ERROR( GetLastError());
+        PR_LOG( _pr_shm_lm, PR_LOG_ERROR, 
+            ("_MD_DetachSharedMemory: UnmapViewOfFile() failed. OSerror: %d", PR_GetOSError()));
+        rc = PR_FAILURE;
+    }
+
+    return( rc );
+}
+
+
+extern PRStatus _MD_CloseSharedMemory( PRSharedMemory *shm )
+{
+    PRStatus rc = PR_SUCCESS;
+    BOOL wrc;
+
+    PR_ASSERT( shm->ident == _PR_SHM_IDENT );
+
+    wrc = CloseHandle( shm->handle );
+    if ( FALSE == wrc )
+    {
+        _PR_MD_MAP_DEFAULT_ERROR( GetLastError());
+        PR_LOG( _pr_shm_lm, PR_LOG_ERROR, 
+            ("_MD_CloseSharedMemory: CloseHandle() failed. OSerror: %d", PR_GetOSError()));
+        rc = PR_FAILURE;
+    }
+    PR_FREEIF( shm->ipcname );
+    PR_DELETE( shm );
+
+    return( rc );
+} /* end _MD_CLOSE_SHARED_MEMORY() */
+
+extern PRStatus _MD_DeleteSharedMemory( const char *name )
+{
+    return( PR_SUCCESS );
+}    
+
+
+/*
+** Windows implementation of anonymous memory (file) map
+*/
+extern PRLogModuleInfo *_pr_shma_lm;
+
+extern PRFileMap* _md_OpenAnonFileMap( 
+    const char *dirName,
+    PRSize      size,
+    PRFileMapProtect prot
+)
+{
+    PRFileMap   *fm;
+    HANDLE      hFileMap;
+
+    fm = PR_CreateFileMap( (PRFileDesc*)-1, size, prot );
+    if ( NULL == fm )  {
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("_md_OpenAnonFileMap(): PR_CreateFileMap(): failed"));
+        goto Finished;
+    }
+
+    /*
+    ** Make fm->md.hFileMap inheritable. We can't use
+    ** GetHandleInformation and SetHandleInformation
+    ** because these two functions fail with
+    ** ERROR_CALL_NOT_IMPLEMENTED on Win95.
+    */
+    if (DuplicateHandle(GetCurrentProcess(), fm->md.hFileMap,
+            GetCurrentProcess(), &hFileMap,
+            0, TRUE /* inheritable */,
+            DUPLICATE_SAME_ACCESS) == FALSE) {
+        PR_SetError( PR_UNKNOWN_ERROR, GetLastError() );
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("_md_OpenAnonFileMap(): DuplicateHandle(): failed"));
+        PR_CloseFileMap( fm );
+        fm = NULL;
+        goto Finished;
+    }
+    CloseHandle(fm->md.hFileMap);
+    fm->md.hFileMap = hFileMap;
+
+Finished:    
+    return(fm);
+} /* end md_OpenAnonFileMap() */
+
+/*
+** _md_ExportFileMapAsString()
+**
+*/
+extern PRStatus _md_ExportFileMapAsString(
+    PRFileMap *fm,
+    PRSize    bufSize,
+    char      *buf
+)
+{
+    PRIntn  written;
+
+    written = PR_snprintf( buf, (PRUint32) bufSize, "%d:%" PR_PRIdOSFD ":%ld",
+        (PRIntn)fm->prot, (PROsfd)fm->md.hFileMap, (PRInt32)fm->md.dwAccess );
+
+    PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+        ("_md_ExportFileMapAsString(): prot: %x, hFileMap: %x, dwAccess: %x",
+            fm->prot, fm->md.hFileMap, fm->md.dwAccess ));
+        
+    return((written == -1)? PR_FAILURE : PR_SUCCESS);
+} /* end _md_ExportFileMapAsString() */
+
+
+/*
+** _md_ImportFileMapFromString()
+**
+*/
+extern PRFileMap * _md_ImportFileMapFromString(
+    const char *fmstring
+)
+{
+    PRIntn  prot;
+    PROsfd hFileMap;
+    PRInt32 dwAccess;
+    PRFileMap *fm = NULL;
+
+    PR_sscanf( fmstring, "%d:%" PR_SCNdOSFD ":%ld",
+        &prot, &hFileMap, &dwAccess );
+
+    fm = PR_NEWZAP(PRFileMap);
+    if ( NULL == fm ) {
+        PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+            ("_md_ImportFileMapFromString(): PR_NEWZAP(): Failed"));
+        return(fm);
+    }
+
+    fm->prot = (PRFileMapProtect)prot;
+    fm->md.hFileMap = (HANDLE)hFileMap;
+    fm->md.dwAccess = (DWORD)dwAccess;
+    fm->fd = (PRFileDesc*)-1;
+
+    PR_LOG( _pr_shma_lm, PR_LOG_DEBUG,
+        ("_md_ImportFileMapFromString(): fm: %p, prot: %d, hFileMap: %8.8x, dwAccess: %8.8x, fd: %x",
+            fm, prot, fm->md.hFileMap, fm->md.dwAccess, fm->fd));
+    return(fm);
+} /* end _md_ImportFileMapFromString() */
+
+#else
+Error! Why is PR_HAVE_WIN32_NAMED_SHARED_MEMORY not defined? 
+#endif /* PR_HAVE_WIN32_NAMED_SHARED_MEMORY */
+/* --- end w32shm.c --- */
diff --git a/nsprpub/pr/src/md/windows/w95cv.c b/nsprpub/pr/src/md/windows/w95cv.c
new file mode 100644
index 000000000..27b34e691
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/w95cv.c
@@ -0,0 +1,367 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ *  w95cv.c -- Windows 95 Machine-Dependent Code for Condition Variables
+ *
+ *  We implement our own condition variable wait queue.  Each thread
+ *  has a semaphore object (thread->md.blocked_sema) to block on while
+ *  waiting on a condition variable.
+ *
+ *  We use a deferred condition notify algorithm.  When PR_NotifyCondVar
+ *  or PR_NotifyAllCondVar is called, the condition notifies are simply
+ *  recorded in the _MDLock structure.  We defer the condition notifies
+ *  until right after we unlock the lock.  This way the awakened threads
+ *  have a better chance to reaquire the lock.
+ */
+ 
+#include "primpl.h"
+
+/*
+ * AddThreadToCVWaitQueueInternal --
+ *
+ * Add the thread to the end of the condition variable's wait queue.
+ * The CV's lock must be locked when this function is called.
+ */
+
+static void
+AddThreadToCVWaitQueueInternal(PRThread *thred, struct _MDCVar *cv)
+{
+    PR_ASSERT((cv->waitTail != NULL && cv->waitHead != NULL)
+            || (cv->waitTail == NULL && cv->waitHead == NULL));
+    cv->nwait += 1;
+    thred->md.inCVWaitQueue = PR_TRUE;
+    thred->md.next = NULL;
+    thred->md.prev = cv->waitTail;
+    if (cv->waitHead == NULL) {
+        cv->waitHead = thred;
+    } else {
+        cv->waitTail->md.next = thred;
+    }
+    cv->waitTail = thred;
+}
+
+/*
+ * md_UnlockAndPostNotifies --
+ *
+ * Unlock the lock, and then do the deferred condition notifies.
+ * If waitThred and waitCV are not NULL, waitThred is added to
+ * the wait queue of waitCV before the lock is unlocked.
+ *
+ * This function is called by _PR_MD_WAIT_CV and _PR_MD_UNLOCK,
+ * the two places where a lock is unlocked.
+ */
+static void
+md_UnlockAndPostNotifies(
+    _MDLock *lock,
+    PRThread *waitThred,
+    _MDCVar *waitCV)
+{
+    PRIntn index;
+    _MDNotified post;
+    _MDNotified *notified, *prev = NULL;
+
+    /*
+     * Time to actually notify any conditions that were affected
+     * while the lock was held.  Get a copy of the list that's in
+     * the lock structure and then zero the original.  If it's
+     * linked to other such structures, we own that storage.
+     */
+    post = lock->notified;  /* a safe copy; we own the lock */
+
+#if defined(DEBUG)
+    ZeroMemory(&lock->notified, sizeof(_MDNotified));  /* reset */
+#else
+    lock->notified.length = 0;  /* these are really sufficient */
+    lock->notified.link = NULL;
+#endif
+
+    /* 
+     * Figure out how many threads we need to wake up.
+     */
+    notified = &post;  /* this is where we start */
+    do {
+        for (index = 0; index < notified->length; ++index) {
+            _MDCVar *cv = notified->cv[index].cv;
+            PRThread *thred;
+            int i;
+            
+            /* Fast special case: no waiting threads */
+            if (cv->waitHead == NULL) {
+                notified->cv[index].notifyHead = NULL;
+                continue;
+            }
+
+            /* General case */
+            if (-1 == notified->cv[index].times) {
+                /* broadcast */
+                thred = cv->waitHead;
+                while (thred != NULL) {
+                    thred->md.inCVWaitQueue = PR_FALSE;
+                    thred = thred->md.next;
+                }
+                notified->cv[index].notifyHead = cv->waitHead;
+                cv->waitHead = cv->waitTail = NULL;
+                cv->nwait = 0;
+            } else {
+                thred = cv->waitHead;
+                i = notified->cv[index].times;
+                while (thred != NULL && i > 0) {
+                    thred->md.inCVWaitQueue = PR_FALSE;
+                    thred = thred->md.next;
+                    i--;
+                }
+                notified->cv[index].notifyHead = cv->waitHead;
+                cv->waitHead = thred;
+                if (cv->waitHead == NULL) {
+                    cv->waitTail = NULL;
+                } else {
+                    if (cv->waitHead->md.prev != NULL) {
+                        cv->waitHead->md.prev->md.next = NULL;
+                        cv->waitHead->md.prev = NULL;
+                    }
+                }
+                cv->nwait -= notified->cv[index].times - i;
+            }
+        }
+        notified = notified->link;
+    } while (NULL != notified);
+
+    if (waitThred) {
+        AddThreadToCVWaitQueueInternal(waitThred, waitCV);
+    }
+
+    /* Release the lock before notifying */
+        LeaveCriticalSection(&lock->mutex);
+
+    notified = &post;  /* this is where we start */
+    do {
+        for (index = 0; index < notified->length; ++index) {
+            PRThread *thred;
+            PRThread *next;
+
+            thred = notified->cv[index].notifyHead;
+            while (thred != NULL) {
+                BOOL rv;
+
+                next = thred->md.next;
+                thred->md.prev = thred->md.next = NULL;
+
+                rv = ReleaseSemaphore(thred->md.blocked_sema, 1, NULL);
+                PR_ASSERT(rv != 0);
+                thred = next;
+            }
+        }
+        prev = notified;
+        notified = notified->link;
+        if (&post != prev) PR_DELETE(prev);
+    } while (NULL != notified);
+}
+
+/*
+ * Notifies just get posted to the protecting mutex.  The
+ * actual notification is done when the lock is released so that
+ * MP systems don't contend for a lock that they can't have.
+ */
+static void md_PostNotifyToCvar(_MDCVar *cvar, _MDLock *lock,
+        PRBool broadcast)
+{
+    PRIntn index = 0;
+    _MDNotified *notified = &lock->notified;
+
+    while (1) {
+        for (index = 0; index < notified->length; ++index) {
+            if (notified->cv[index].cv == cvar) {
+                if (broadcast) {
+                    notified->cv[index].times = -1;
+                } else if (-1 != notified->cv[index].times) {
+                    notified->cv[index].times += 1;
+                }
+                return;
+            }
+        }
+        /* if not full, enter new CV in this array */
+        if (notified->length < _MD_CV_NOTIFIED_LENGTH) break;
+
+        /* if there's no link, create an empty array and link it */
+        if (NULL == notified->link) {
+            notified->link = PR_NEWZAP(_MDNotified);
+        }
+
+        notified = notified->link;
+    }
+
+    /* A brand new entry in the array */
+    notified->cv[index].times = (broadcast) ? -1 : 1;
+    notified->cv[index].cv = cvar;
+    notified->length += 1;
+}
+
+/*
+ * _PR_MD_NEW_CV() -- Creating new condition variable
+ * ... Solaris uses cond_init() in similar function.
+ *
+ * returns: -1 on failure
+ *          0 when it succeeds.
+ *
+ */
+PRInt32 
+_PR_MD_NEW_CV(_MDCVar *cv)
+{
+    cv->magic = _MD_MAGIC_CV;
+    /*
+     * The waitHead, waitTail, and nwait fields are zeroed
+     * when the PRCondVar structure is created.
+     */
+    return 0;
+} 
+
+void _PR_MD_FREE_CV(_MDCVar *cv)
+{
+    cv->magic = (PRUint32)-1;
+    return;
+}
+
+/*
+ *  _PR_MD_WAIT_CV() -- Wait on condition variable
+ */
+void _PR_MD_WAIT_CV(_MDCVar *cv, _MDLock *lock, PRIntervalTime timeout )
+{
+    PRThread *thred = _PR_MD_CURRENT_THREAD();
+    DWORD rv;
+    DWORD msecs = (timeout == PR_INTERVAL_NO_TIMEOUT) ?
+            INFINITE : PR_IntervalToMilliseconds(timeout);
+
+    /*
+     * If we have pending notifies, post them now.
+     */
+    if (0 != lock->notified.length) {
+        md_UnlockAndPostNotifies(lock, thred, cv);
+    } else {
+        AddThreadToCVWaitQueueInternal(thred, cv);
+        LeaveCriticalSection(&lock->mutex);
+    }
+
+    /* Wait for notification or timeout; don't really care which */
+    rv = WaitForSingleObject(thred->md.blocked_sema, msecs);
+
+    EnterCriticalSection(&(lock->mutex));
+
+    PR_ASSERT(rv != WAIT_ABANDONED);
+    PR_ASSERT(rv != WAIT_FAILED);
+    PR_ASSERT(rv != WAIT_OBJECT_0 || thred->md.inCVWaitQueue == PR_FALSE);
+
+    if (rv == WAIT_TIMEOUT) {
+        if (thred->md.inCVWaitQueue) {
+            PR_ASSERT((cv->waitTail != NULL && cv->waitHead != NULL)
+                    || (cv->waitTail == NULL && cv->waitHead == NULL));
+            cv->nwait -= 1;
+            thred->md.inCVWaitQueue = PR_FALSE;
+            if (cv->waitHead == thred) {
+                cv->waitHead = thred->md.next;
+                if (cv->waitHead == NULL) {
+                    cv->waitTail = NULL;
+                } else {
+                    cv->waitHead->md.prev = NULL;
+                }
+            } else {
+                PR_ASSERT(thred->md.prev != NULL);
+                thred->md.prev->md.next = thred->md.next;
+                if (thred->md.next != NULL) {
+                    thred->md.next->md.prev = thred->md.prev;
+                } else {
+                    PR_ASSERT(cv->waitTail == thred);
+                    cv->waitTail = thred->md.prev;
+                }
+            }
+            thred->md.next = thred->md.prev = NULL;
+        } else {
+            /*
+             * This thread must have been notified, but the
+             * ReleaseSemaphore call happens after WaitForSingleObject
+             * times out.  Wait on the semaphore again to make it
+             * non-signaled.  We assume this wait won't take long.
+             */
+            rv = WaitForSingleObject(thred->md.blocked_sema, INFINITE);
+            PR_ASSERT(rv == WAIT_OBJECT_0);
+        }
+    }
+    PR_ASSERT(thred->md.inCVWaitQueue == PR_FALSE);
+    return;
+} /* --- end _PR_MD_WAIT_CV() --- */
+
+void _PR_MD_NOTIFY_CV(_MDCVar *cv, _MDLock *lock)
+{
+    md_PostNotifyToCvar(cv, lock, PR_FALSE);
+    return;
+}
+
+void _PR_MD_NOTIFYALL_CV(_MDCVar *cv, _MDLock *lock)
+{
+    md_PostNotifyToCvar(cv, lock, PR_TRUE);
+    return;
+}
+
+typedef BOOL (WINAPI *INITIALIZECRITICALSECTIONEX)(
+    CRITICAL_SECTION *lpCriticalSection,
+    DWORD dwSpinCount,
+    DWORD Flags);
+
+static INITIALIZECRITICALSECTIONEX sInitializeCriticalSectionEx;
+
+void _PR_MD_INIT_LOCKS(void)
+{
+    /*
+     * Starting with Windows Vista, every CRITICAL_SECTION allocates an extra
+     * RTL_CRITICAL_SECTION_DEBUG object. Unfortunately, this debug object is
+     * not reclaimed by DeleteCriticalSection(), causing an apparent memory
+     * leak. This is a debugging "feature", not a bug. If we are running on
+     * Vista or later, use InitializeCriticalSectionEx() to allocate
+     * CRITICAL_SECTIONs without debug objects.
+     */
+    HMODULE hKernel32 = GetModuleHandle("kernel32.dll");
+    PR_ASSERT(hKernel32);
+    PR_ASSERT(!sInitializeCriticalSectionEx);
+    sInitializeCriticalSectionEx = (INITIALIZECRITICALSECTIONEX)
+            GetProcAddress(hKernel32, "InitializeCriticalSectionEx");
+}
+
+/*
+ * By default, CRITICAL_SECTIONs are initialized with a spin count of 0.
+ * Joe Duffy's "Concurrent Programming on Windows" book suggests 1500 is
+ * a "reasonable starting point". On single-processor systems, the spin
+ * count is ignored and the critical section spin count is set to 0.
+ */
+#define LOCK_SPIN_COUNT 1500
+
+PRStatus _PR_MD_NEW_LOCK(_MDLock *lock)
+{
+    CRITICAL_SECTION *cs = &lock->mutex;
+    BOOL ok;
+
+    if (sInitializeCriticalSectionEx) {
+        ok = sInitializeCriticalSectionEx(cs, LOCK_SPIN_COUNT,
+                                          CRITICAL_SECTION_NO_DEBUG_INFO);
+    } else {
+        ok = InitializeCriticalSectionAndSpinCount(cs, LOCK_SPIN_COUNT);
+    }
+    if (!ok) {
+        _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+        return PR_FAILURE;
+    }
+
+    lock->notified.length = 0;
+    lock->notified.link = NULL;
+    return PR_SUCCESS;
+}
+
+void _PR_MD_UNLOCK(_MDLock *lock)
+{
+    if (0 != lock->notified.length) {
+        md_UnlockAndPostNotifies(lock, NULL, NULL);
+    } else {
+        LeaveCriticalSection(&lock->mutex);
+    }
+}
diff --git a/nsprpub/pr/src/md/windows/w95dllmain.c b/nsprpub/pr/src/md/windows/w95dllmain.c
new file mode 100644
index 000000000..73707a6e1
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/w95dllmain.c
@@ -0,0 +1,39 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * The DLL entry point (DllMain) for NSPR.
+ *
+ * This is used to detach threads that were automatically attached by
+ * nspr.
+ */
+
+#include <windows.h>
+#include <primpl.h>
+
+BOOL WINAPI DllMain(
+    HINSTANCE hinstDLL,
+    DWORD fdwReason,
+    LPVOID lpvReserved)
+{
+PRThread *me;
+
+    switch (fdwReason) {
+        case DLL_PROCESS_ATTACH:
+            break;
+        case DLL_THREAD_ATTACH:
+            break;
+        case DLL_THREAD_DETACH:
+            if (_pr_initialized) {
+                me = _MD_GET_ATTACHED_THREAD();
+                if ((me != NULL) && (me->flags & _PR_ATTACHED))
+                    _PRI_DetachThread();
+            }
+            break;
+        case DLL_PROCESS_DETACH:
+            break;
+    }
+    return TRUE;
+}
diff --git a/nsprpub/pr/src/md/windows/w95io.c b/nsprpub/pr/src/md/windows/w95io.c
new file mode 100644
index 000000000..9bae6f8df
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/w95io.c
@@ -0,0 +1,1373 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Windows 95 IO module
+ *
+ * Assumes synchronous I/O.
+ *
+ */
+
+#include "primpl.h"
+#include <direct.h>
+#include <mbstring.h>
+#ifdef MOZ_UNICODE
+#include <wchar.h>
+#endif /* MOZ_UNICODE */
+
+struct _MDLock               _pr_ioq_lock;
+
+/*
+ * NSPR-to-NT access right mapping table for files.
+ */
+static DWORD fileAccessTable[] = {
+    FILE_GENERIC_READ,
+    FILE_GENERIC_WRITE,
+    FILE_GENERIC_EXECUTE
+};
+
+/*
+ * NSPR-to-NT access right mapping table for directories.
+ */
+static DWORD dirAccessTable[] = {
+    FILE_GENERIC_READ,
+    FILE_GENERIC_WRITE|FILE_DELETE_CHILD,
+    FILE_GENERIC_EXECUTE
+};
+
+static PRBool IsPrevCharSlash(const char *str, const char *current);
+
+void
+_PR_MD_INIT_IO()
+{
+    WORD WSAVersion = 0x0101;
+    WSADATA WSAData;
+    int err;
+
+    err = WSAStartup( WSAVersion, &WSAData );
+    PR_ASSERT(0 == err);
+
+#ifdef DEBUG
+    /* Doublecheck _pr_filetime_offset's hard-coded value is correct. */
+    {
+        SYSTEMTIME systime;
+        union {
+           PRTime prt;
+           FILETIME ft;
+        } filetime;
+        BOOL rv;
+
+        systime.wYear = 1970;
+        systime.wMonth = 1;
+        /* wDayOfWeek is ignored */
+        systime.wDay = 1;
+        systime.wHour = 0;
+        systime.wMinute = 0;
+        systime.wSecond = 0;
+        systime.wMilliseconds = 0;
+
+        rv = SystemTimeToFileTime(&systime, &filetime.ft);
+        PR_ASSERT(0 != rv);
+        PR_ASSERT(filetime.prt == _pr_filetime_offset);
+    }
+#endif /* DEBUG */
+
+    _PR_NT_InitSids();
+
+    _PR_MD_InitSockets();
+}
+
+PRStatus
+_PR_MD_WAIT(PRThread *thread, PRIntervalTime ticks)
+{
+    DWORD rv;
+
+    PRUint32 msecs = (ticks == PR_INTERVAL_NO_TIMEOUT) ?
+        INFINITE : PR_IntervalToMilliseconds(ticks);
+    rv = WaitForSingleObject(thread->md.blocked_sema, msecs);
+    switch(rv) 
+    {
+        case WAIT_OBJECT_0:
+            return PR_SUCCESS;
+        case WAIT_TIMEOUT:
+            _PR_THREAD_LOCK(thread);
+            if (thread->state == _PR_IO_WAIT) {
+			  ;
+            } else {
+                if (thread->wait.cvar != NULL) {
+                    thread->wait.cvar = NULL;
+                    _PR_THREAD_UNLOCK(thread);
+                } else {
+                    /* The CVAR was notified just as the timeout
+                     * occurred.  This led to us being notified twice.
+                     * call WaitForSingleObject() to clear the semaphore.
+                     */
+                    _PR_THREAD_UNLOCK(thread);
+                    rv = WaitForSingleObject(thread->md.blocked_sema, 0);
+                    PR_ASSERT(rv == WAIT_OBJECT_0);
+                }
+            }
+            return PR_SUCCESS;
+        default:
+            return PR_FAILURE;
+    }
+}
+PRStatus
+_PR_MD_WAKEUP_WAITER(PRThread *thread)
+{
+    if ( _PR_IS_NATIVE_THREAD(thread) ) 
+    {
+        if (ReleaseSemaphore(thread->md.blocked_sema, 1, NULL) == FALSE)
+            return PR_FAILURE;
+        else
+			return PR_SUCCESS;
+	}
+}
+
+
+/* --- FILE IO ----------------------------------------------------------- */
+/*
+ *  _PR_MD_OPEN() -- Open a file
+ *
+ *  returns: a fileHandle
+ *
+ *  The NSPR open flags (osflags) are translated into flags for Win95
+ *
+ *  Mode seems to be passed in as a unix style file permissions argument
+ *  as in 0666, in the case of opening the logFile. 
+ *
+ */
+PROsfd
+_PR_MD_OPEN(const char *name, PRIntn osflags, int mode)
+{
+    HANDLE file;
+    PRInt32 access = 0;
+    PRInt32 flags = 0;
+    PRInt32 flag6 = 0;
+    
+    if (osflags & PR_SYNC) flag6 = FILE_FLAG_WRITE_THROUGH;
+ 
+    if (osflags & PR_RDONLY || osflags & PR_RDWR)
+        access |= GENERIC_READ;
+    if (osflags & PR_WRONLY || osflags & PR_RDWR)
+        access |= GENERIC_WRITE;
+
+    if ( osflags & PR_CREATE_FILE && osflags & PR_EXCL )
+        flags = CREATE_NEW;
+    else if (osflags & PR_CREATE_FILE) {
+        if (osflags & PR_TRUNCATE)
+            flags = CREATE_ALWAYS;
+        else
+            flags = OPEN_ALWAYS;
+    } else {
+        if (osflags & PR_TRUNCATE)
+            flags = TRUNCATE_EXISTING;
+        else
+            flags = OPEN_EXISTING;
+    }
+
+    file = CreateFileA(name,
+                       access,
+                       FILE_SHARE_READ|FILE_SHARE_WRITE,
+                       NULL,
+                       flags,
+                       flag6,
+                       NULL);
+    if (file == INVALID_HANDLE_VALUE) {
+		_PR_MD_MAP_OPEN_ERROR(GetLastError());
+        return -1; 
+	}
+
+    return (PROsfd)file;
+}
+
+PROsfd
+_PR_MD_OPEN_FILE(const char *name, PRIntn osflags, int mode)
+{
+    HANDLE file;
+    PRInt32 access = 0;
+    PRInt32 flags = 0;
+    PRInt32 flag6 = 0;
+    SECURITY_ATTRIBUTES sa;
+    LPSECURITY_ATTRIBUTES lpSA = NULL;
+    PSECURITY_DESCRIPTOR pSD = NULL;
+    PACL pACL = NULL;
+
+    if (osflags & PR_CREATE_FILE) {
+        if (_PR_NT_MakeSecurityDescriptorACL(mode, fileAccessTable,
+                &pSD, &pACL) == PR_SUCCESS) {
+            sa.nLength = sizeof(sa);
+            sa.lpSecurityDescriptor = pSD;
+            sa.bInheritHandle = FALSE;
+            lpSA = &sa;
+        }
+    }
+    
+    if (osflags & PR_SYNC) flag6 = FILE_FLAG_WRITE_THROUGH;
+ 
+    if (osflags & PR_RDONLY || osflags & PR_RDWR)
+        access |= GENERIC_READ;
+    if (osflags & PR_WRONLY || osflags & PR_RDWR)
+        access |= GENERIC_WRITE;
+
+    if ( osflags & PR_CREATE_FILE && osflags & PR_EXCL )
+        flags = CREATE_NEW;
+    else if (osflags & PR_CREATE_FILE) {
+        if (osflags & PR_TRUNCATE)
+            flags = CREATE_ALWAYS;
+        else
+            flags = OPEN_ALWAYS;
+    } else {
+        if (osflags & PR_TRUNCATE)
+            flags = TRUNCATE_EXISTING;
+        else
+            flags = OPEN_EXISTING;
+    }
+
+    file = CreateFileA(name,
+                       access,
+                       FILE_SHARE_READ|FILE_SHARE_WRITE,
+                       lpSA,
+                       flags,
+                       flag6,
+                       NULL);
+    if (lpSA != NULL) {
+        _PR_NT_FreeSecurityDescriptorACL(pSD, pACL);
+    }
+    if (file == INVALID_HANDLE_VALUE) {
+		_PR_MD_MAP_OPEN_ERROR(GetLastError());
+        return -1; 
+	}
+
+    return (PROsfd)file;
+}
+
+PRInt32
+_PR_MD_READ(PRFileDesc *fd, void *buf, PRInt32 len)
+{
+    PRUint32 bytes;
+    int rv, err;
+
+    rv = ReadFile((HANDLE)fd->secret->md.osfd,
+            (LPVOID)buf,
+            len,
+            &bytes,
+            NULL);
+    
+    if (rv == 0) 
+    {
+        err = GetLastError();
+        /* ERROR_HANDLE_EOF can only be returned by async io */
+        PR_ASSERT(err != ERROR_HANDLE_EOF);
+        if (err == ERROR_BROKEN_PIPE)
+            return 0;
+		else {
+			_PR_MD_MAP_READ_ERROR(err);
+        return -1;
+    }
+    }
+    return bytes;
+}
+
+PRInt32
+_PR_MD_WRITE(PRFileDesc *fd, const void *buf, PRInt32 len)
+{
+    PROsfd f = fd->secret->md.osfd;
+    PRInt32 bytes;
+    int rv;
+    
+    rv = WriteFile((HANDLE)f,
+            buf,
+            len,
+            &bytes,
+            NULL );
+            
+    if (rv == 0) 
+    {
+		_PR_MD_MAP_WRITE_ERROR(GetLastError());
+        return -1;
+    }
+    return bytes;
+} /* --- end _PR_MD_WRITE() --- */
+
+PROffset32
+_PR_MD_LSEEK(PRFileDesc *fd, PROffset32 offset, PRSeekWhence whence)
+{
+    DWORD moveMethod;
+    PROffset32 rv;
+
+    switch (whence) {
+        case PR_SEEK_SET:
+            moveMethod = FILE_BEGIN;
+            break;
+        case PR_SEEK_CUR:
+            moveMethod = FILE_CURRENT;
+            break;
+        case PR_SEEK_END:
+            moveMethod = FILE_END;
+            break;
+        default:
+            PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+            return -1;
+    }
+
+    rv = SetFilePointer((HANDLE)fd->secret->md.osfd, offset, NULL, moveMethod);
+
+    /*
+     * If the lpDistanceToMoveHigh argument (third argument) is
+     * NULL, SetFilePointer returns 0xffffffff on failure.
+     */
+    if (-1 == rv) {
+        _PR_MD_MAP_LSEEK_ERROR(GetLastError());
+    }
+    return rv;
+}
+
+PROffset64
+_PR_MD_LSEEK64(PRFileDesc *fd, PROffset64 offset, PRSeekWhence whence)
+{
+    DWORD moveMethod;
+    LARGE_INTEGER li;
+    DWORD err;
+
+    switch (whence) {
+        case PR_SEEK_SET:
+            moveMethod = FILE_BEGIN;
+            break;
+        case PR_SEEK_CUR:
+            moveMethod = FILE_CURRENT;
+            break;
+        case PR_SEEK_END:
+            moveMethod = FILE_END;
+            break;
+        default:
+            PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+            return -1;
+    }
+
+    li.QuadPart = offset;
+    li.LowPart = SetFilePointer((HANDLE)fd->secret->md.osfd,
+            li.LowPart, &li.HighPart, moveMethod);
+
+    if (0xffffffff == li.LowPart && (err = GetLastError()) != NO_ERROR) {
+        _PR_MD_MAP_LSEEK_ERROR(err);
+        li.QuadPart = -1;
+    }
+    return li.QuadPart;
+}
+
+/*
+ * This is documented to succeed on read-only files, but Win32's
+ * FlushFileBuffers functions fails with "access denied" in such a
+ * case.  So we only signal an error if the error is *not* "access
+ * denied".
+ */
+PRInt32
+_PR_MD_FSYNC(PRFileDesc *fd)
+{
+    /*
+     * From the documentation:
+     *
+     *	   On Windows NT, the function FlushFileBuffers fails if hFile
+     *	   is a handle to console output. That is because console
+     *	   output is not buffered. The function returns FALSE, and
+     *	   GetLastError returns ERROR_INVALID_HANDLE.
+     *
+     * On the other hand, on Win95, it returns without error.  I cannot
+     * assume that 0, 1, and 2 are console, because if someone closes
+     * System.out and then opens a file, they might get file descriptor
+     * 1.  An error on *that* version of 1 should be reported, whereas
+     * an error on System.out (which was the original 1) should be
+     * ignored.  So I use isatty() to ensure that such an error was due
+     * to this bogosity, and if it was, I ignore the error.
+     */
+
+    BOOL ok = FlushFileBuffers((HANDLE)fd->secret->md.osfd);
+
+    if (!ok) {
+	DWORD err = GetLastError();
+	if (err != ERROR_ACCESS_DENIED) {	// from winerror.h
+			_PR_MD_MAP_FSYNC_ERROR(err);
+	    return -1;
+	}
+    }
+    return 0;
+}
+
+PRInt32
+_MD_CloseFile(PROsfd osfd)
+{
+    PRInt32 rv;
+    
+    rv = (CloseHandle((HANDLE)osfd))?0:-1;
+	if (rv == -1)
+		_PR_MD_MAP_CLOSE_ERROR(GetLastError());
+    return rv;
+}
+
+
+/* --- DIR IO ------------------------------------------------------------ */
+#define GetFileFromDIR(d)       (d)->d_entry.cFileName
+#define FileIsHidden(d)	((d)->d_entry.dwFileAttributes & FILE_ATTRIBUTE_HIDDEN)
+
+static void FlipSlashes(char *cp, size_t len)
+{
+    while (len-- > 0) {
+        if (cp[0] == '/') {
+            cp[0] = PR_DIRECTORY_SEPARATOR;
+        }
+        cp = _mbsinc(cp);
+    }
+} /* end FlipSlashes() */
+
+
+/*
+**
+** Local implementations of standard Unix RTL functions which are not provided
+** by the VC RTL.
+**
+*/
+
+PRInt32
+_PR_MD_CLOSE_DIR(_MDDir *d)
+{
+    if ( d ) {
+        if (FindClose(d->d_hdl)) {
+        d->magic = (PRUint32)-1;
+        return 0;
+		} else {
+			_PR_MD_MAP_CLOSEDIR_ERROR(GetLastError());
+        	return -1;
+		}
+    }
+    PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+    return -1;
+}
+
+
+PRStatus
+_PR_MD_OPEN_DIR(_MDDir *d, const char *name)
+{
+    char filename[ MAX_PATH ];
+    size_t len;
+
+    len = strlen(name);
+    /* Need 5 bytes for \*.* and the trailing null byte. */
+    if (len + 5 > MAX_PATH) {
+        PR_SetError(PR_NAME_TOO_LONG_ERROR, 0);
+        return PR_FAILURE;
+    }
+    strcpy(filename, name);
+
+    /*
+     * If 'name' ends in a slash or backslash, do not append
+     * another backslash.
+     */
+    if (IsPrevCharSlash(filename, filename + len)) {
+        len--;
+    }
+    strcpy(&filename[len], "\\*.*");
+    FlipSlashes( filename, strlen(filename) );
+
+    d->d_hdl = FindFirstFileA( filename, &(d->d_entry) );
+    if ( d->d_hdl == INVALID_HANDLE_VALUE ) {
+		_PR_MD_MAP_OPENDIR_ERROR(GetLastError());
+        return PR_FAILURE;
+    }
+    d->firstEntry = PR_TRUE;
+    d->magic = _MD_MAGIC_DIR;
+    return PR_SUCCESS;
+}
+
+char *
+_PR_MD_READ_DIR(_MDDir *d, PRIntn flags)
+{
+    PRInt32 err;
+    BOOL rv;
+    char *fileName;
+
+    if ( d ) {
+        while (1) {
+            if (d->firstEntry) {
+                d->firstEntry = PR_FALSE;
+                rv = 1;
+            } else {
+                rv = FindNextFileA(d->d_hdl, &(d->d_entry));
+            }
+            if (rv == 0) {
+                break;
+            }
+            fileName = GetFileFromDIR(d);
+            if ( (flags & PR_SKIP_DOT) &&
+                 (fileName[0] == '.') && (fileName[1] == '\0'))
+                 continue;
+            if ( (flags & PR_SKIP_DOT_DOT) &&
+                 (fileName[0] == '.') && (fileName[1] == '.') &&
+                 (fileName[2] == '\0'))
+                 continue;
+            if ( (flags & PR_SKIP_HIDDEN) && FileIsHidden(d))
+                 continue;
+            return fileName;
+        }
+        err = GetLastError();
+        PR_ASSERT(NO_ERROR != err);
+			_PR_MD_MAP_READDIR_ERROR(err);
+        return NULL;
+		}
+    PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+    return NULL;
+}
+
+PRInt32
+_PR_MD_DELETE(const char *name)
+{
+    if (DeleteFileA(name)) {
+        return 0;
+    } else {
+		_PR_MD_MAP_DELETE_ERROR(GetLastError());
+        return -1;
+    }
+}
+
+void
+_PR_FileTimeToPRTime(const FILETIME *filetime, PRTime *prtm)
+{
+    PR_ASSERT(sizeof(FILETIME) == sizeof(PRTime));
+    CopyMemory(prtm, filetime, sizeof(PRTime));
+#if defined(__MINGW32__)
+    *prtm = (*prtm - _pr_filetime_offset) / 10LL;
+#else
+    *prtm = (*prtm - _pr_filetime_offset) / 10i64;
+#endif
+
+#ifdef DEBUG
+    /* Doublecheck our calculation. */
+    {
+        SYSTEMTIME systime;
+        PRExplodedTime etm;
+        PRTime cmp; /* for comparison */
+        BOOL rv;
+
+        rv = FileTimeToSystemTime(filetime, &systime);
+        PR_ASSERT(0 != rv);
+
+        /*
+         * PR_ImplodeTime ignores wday and yday.
+         */
+        etm.tm_usec = systime.wMilliseconds * PR_USEC_PER_MSEC;
+        etm.tm_sec = systime.wSecond;
+        etm.tm_min = systime.wMinute;
+        etm.tm_hour = systime.wHour;
+        etm.tm_mday = systime.wDay;
+        etm.tm_month = systime.wMonth - 1;
+        etm.tm_year = systime.wYear;
+        /*
+         * It is not well-documented what time zone the FILETIME's
+         * are in.  WIN32_FIND_DATA is documented to be in UTC (GMT).
+         * But BY_HANDLE_FILE_INFORMATION is unclear about this.
+         * By our best judgement, we assume that FILETIME is in UTC.
+         */
+        etm.tm_params.tp_gmt_offset = 0;
+        etm.tm_params.tp_dst_offset = 0;
+        cmp = PR_ImplodeTime(&etm);
+
+        /*
+         * SYSTEMTIME is in milliseconds precision, so we convert PRTime's
+         * microseconds to milliseconds before doing the comparison.
+         */
+        PR_ASSERT((cmp / PR_USEC_PER_MSEC) == (*prtm / PR_USEC_PER_MSEC));
+    }
+#endif /* DEBUG */
+}
+
+PRInt32
+_PR_MD_STAT(const char *fn, struct stat *info)
+{
+    PRInt32 rv;
+
+    rv = _stat(fn, (struct _stat *)info);
+    if (-1 == rv) {
+        /*
+         * Check for MSVC runtime library _stat() bug.
+         * (It's really a bug in FindFirstFile().)
+         * If a pathname ends in a backslash or slash,
+         * e.g., c:\temp\ or c:/temp/, _stat() will fail.
+         * Note: a pathname ending in a slash (e.g., c:/temp/)
+         * can be handled by _stat() on NT but not on Win95.
+         *
+         * We remove the backslash or slash at the end and
+         * try again.
+         */
+
+        size_t len = strlen(fn);
+        if (len > 0 && len <= _MAX_PATH
+                && IsPrevCharSlash(fn, fn + len)) {
+            char newfn[_MAX_PATH + 1];
+
+            strcpy(newfn, fn);
+            newfn[len - 1] = '\0';
+            rv = _stat(newfn, (struct _stat *)info);
+        }
+    }
+
+    if (-1 == rv) {
+        _PR_MD_MAP_STAT_ERROR(errno);
+    }
+    return rv;
+}
+
+#define _PR_IS_SLASH(ch) ((ch) == '/' || (ch) == '\\')
+
+static PRBool
+IsPrevCharSlash(const char *str, const char *current)
+{
+    const char *prev;
+
+    if (str >= current)
+        return PR_FALSE;
+    prev = _mbsdec(str, current);
+    return (prev == current - 1) && _PR_IS_SLASH(*prev);
+}
+
+/*
+ * IsRootDirectory --
+ *
+ * Return PR_TRUE if the pathname 'fn' is a valid root directory,
+ * else return PR_FALSE.  The char buffer pointed to by 'fn' must
+ * be writable.  During the execution of this function, the contents
+ * of the buffer pointed to by 'fn' may be modified, but on return
+ * the original contents will be restored.  'buflen' is the size of
+ * the buffer pointed to by 'fn'.
+ *
+ * Root directories come in three formats:
+ * 1. / or \, meaning the root directory of the current drive.
+ * 2. C:/ or C:\, where C is a drive letter.
+ * 3. \\<server name>\<share point name>\ or
+ *    \\<server name>\<share point name>, meaning the root directory
+ *    of a UNC (Universal Naming Convention) name.
+ */
+
+static PRBool
+IsRootDirectory(char *fn, size_t buflen)
+{
+    char *p;
+    PRBool slashAdded = PR_FALSE;
+    PRBool rv = PR_FALSE;
+
+    if (_PR_IS_SLASH(fn[0]) && fn[1] == '\0') {
+        return PR_TRUE;
+    }
+
+    if (isalpha(fn[0]) && fn[1] == ':' && _PR_IS_SLASH(fn[2])
+            && fn[3] == '\0') {
+        rv = GetDriveType(fn) > 1 ? PR_TRUE : PR_FALSE;
+        return rv;
+    }
+
+    /* The UNC root directory */
+
+    if (_PR_IS_SLASH(fn[0]) && _PR_IS_SLASH(fn[1])) {
+        /* The 'server' part should have at least one character. */
+        p = &fn[2];
+        if (*p == '\0' || _PR_IS_SLASH(*p)) {
+            return PR_FALSE;
+        }
+
+        /* look for the next slash */
+        do {
+            p = _mbsinc(p);
+        } while (*p != '\0' && !_PR_IS_SLASH(*p));
+        if (*p == '\0') {
+            return PR_FALSE;
+        }
+
+        /* The 'share' part should have at least one character. */
+        p++;
+        if (*p == '\0' || _PR_IS_SLASH(*p)) {
+            return PR_FALSE;
+        }
+
+        /* look for the final slash */
+        do {
+            p = _mbsinc(p);
+        } while (*p != '\0' && !_PR_IS_SLASH(*p));
+        if (_PR_IS_SLASH(*p) && p[1] != '\0') {
+            return PR_FALSE;
+        }
+        if (*p == '\0') {
+            /*
+             * GetDriveType() doesn't work correctly if the
+             * path is of the form \\server\share, so we add
+             * a final slash temporarily.
+             */
+            if ((p + 1) < (fn + buflen)) {
+                *p++ = '\\';
+                *p = '\0';
+                slashAdded = PR_TRUE;
+            } else {
+                return PR_FALSE; /* name too long */
+            }
+        }
+        rv = GetDriveType(fn) > 1 ? PR_TRUE : PR_FALSE;
+        /* restore the 'fn' buffer */
+        if (slashAdded) {
+            *--p = '\0';
+        }
+    }
+    return rv;
+}
+
+PRInt32
+_PR_MD_GETFILEINFO64(const char *fn, PRFileInfo64 *info)
+{
+    WIN32_FILE_ATTRIBUTE_DATA findFileData;
+    BOOL rv;
+    
+    if (NULL == fn || '\0' == *fn) {
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+        return -1;
+    }
+
+    rv = GetFileAttributesEx(fn, GetFileExInfoStandard, &findFileData);
+    if (!rv) {
+        _PR_MD_MAP_OPENDIR_ERROR(GetLastError());
+        return -1;
+    }
+
+    if (findFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
+        info->type = PR_FILE_DIRECTORY;
+    } else {
+        info->type = PR_FILE_FILE;
+    }
+
+    info->size = findFileData.nFileSizeHigh;
+    info->size = (info->size << 32) + findFileData.nFileSizeLow;
+
+    _PR_FileTimeToPRTime(&findFileData.ftLastWriteTime, &info->modifyTime);
+
+    if (0 == findFileData.ftCreationTime.dwLowDateTime &&
+            0 == findFileData.ftCreationTime.dwHighDateTime) {
+        info->creationTime = info->modifyTime;
+    } else {
+        _PR_FileTimeToPRTime(&findFileData.ftCreationTime,
+                &info->creationTime);
+    }
+
+    return 0;
+}
+
+PRInt32
+_PR_MD_GETFILEINFO(const char *fn, PRFileInfo *info)
+{
+    PRFileInfo64 info64;
+    PRInt32 rv = _PR_MD_GETFILEINFO64(fn, &info64);
+    if (0 == rv)
+    {
+        info->type = info64.type;
+        info->size = (PRUint32) info64.size;
+        info->modifyTime = info64.modifyTime;
+        info->creationTime = info64.creationTime;
+    }
+    return rv;
+}
+
+PRInt32
+_PR_MD_GETOPENFILEINFO64(const PRFileDesc *fd, PRFileInfo64 *info)
+{
+    int rv;
+
+    BY_HANDLE_FILE_INFORMATION hinfo;
+
+    rv = GetFileInformationByHandle((HANDLE)fd->secret->md.osfd, &hinfo);
+    if (rv == FALSE) {
+		_PR_MD_MAP_FSTAT_ERROR(GetLastError());
+        return -1;
+	}
+
+    if (hinfo.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+        info->type = PR_FILE_DIRECTORY;
+    else
+        info->type = PR_FILE_FILE;
+
+    info->size = hinfo.nFileSizeHigh;
+    info->size = (info->size << 32) + hinfo.nFileSizeLow;
+
+    _PR_FileTimeToPRTime(&hinfo.ftLastWriteTime, &(info->modifyTime) );
+    _PR_FileTimeToPRTime(&hinfo.ftCreationTime, &(info->creationTime) );
+
+    return 0;
+}
+
+PRInt32
+_PR_MD_GETOPENFILEINFO(const PRFileDesc *fd, PRFileInfo *info)
+{
+    PRFileInfo64 info64;
+    int rv = _PR_MD_GETOPENFILEINFO64(fd, &info64);
+    if (0 == rv)
+    {
+        info->type = info64.type;
+        info->modifyTime = info64.modifyTime;
+        info->creationTime = info64.creationTime;
+        LL_L2I(info->size, info64.size);
+    }
+    return rv;
+}
+
+PRStatus
+_PR_MD_SET_FD_INHERITABLE(PRFileDesc *fd, PRBool inheritable)
+{
+    BOOL rv;
+
+    /*
+     * The SetHandleInformation function fails with the
+     * ERROR_CALL_NOT_IMPLEMENTED error on Win95.
+     */
+    rv = SetHandleInformation(
+            (HANDLE)fd->secret->md.osfd,
+            HANDLE_FLAG_INHERIT,
+            inheritable ? HANDLE_FLAG_INHERIT : 0);
+    if (0 == rv) {
+        _PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+        return PR_FAILURE;
+    }
+    return PR_SUCCESS;
+} 
+
+void
+_PR_MD_INIT_FD_INHERITABLE(PRFileDesc *fd, PRBool imported)
+{
+    if (imported) {
+        fd->secret->inheritable = _PR_TRI_UNKNOWN;
+    } else {
+        fd->secret->inheritable = _PR_TRI_FALSE;
+    }
+}
+
+void
+_PR_MD_QUERY_FD_INHERITABLE(PRFileDesc *fd)
+{
+    DWORD flags;
+
+    PR_ASSERT(_PR_TRI_UNKNOWN == fd->secret->inheritable);
+    if (GetHandleInformation((HANDLE)fd->secret->md.osfd, &flags)) {
+        if (flags & HANDLE_FLAG_INHERIT) {
+            fd->secret->inheritable = _PR_TRI_TRUE;
+        } else {
+            fd->secret->inheritable = _PR_TRI_FALSE;
+        }
+    }
+}
+
+PRInt32
+_PR_MD_RENAME(const char *from, const char *to)
+{
+    /* Does this work with dot-relative pathnames? */
+    if (MoveFileA(from, to)) {
+        return 0;
+    } else {
+		_PR_MD_MAP_RENAME_ERROR(GetLastError());
+        return -1;
+    }
+}
+
+PRInt32
+_PR_MD_ACCESS(const char *name, PRAccessHow how)
+{
+PRInt32 rv;
+    switch (how) {
+      case PR_ACCESS_WRITE_OK:
+        rv = _access(name, 02);
+		break;
+      case PR_ACCESS_READ_OK:
+        rv = _access(name, 04);
+		break;
+      case PR_ACCESS_EXISTS:
+        return _access(name, 00);
+	  	break;
+      default:
+		PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+		return -1;
+    }
+	if (rv < 0)
+		_PR_MD_MAP_ACCESS_ERROR(errno);
+    return rv;
+}
+
+PRInt32
+_PR_MD_MKDIR(const char *name, PRIntn mode)
+{
+    /* XXXMB - how to translate the "mode"??? */
+    if (CreateDirectoryA(name, NULL)) {
+        return 0;
+    } else {
+		_PR_MD_MAP_MKDIR_ERROR(GetLastError());
+        return -1;
+    }
+}
+
+PRInt32
+_PR_MD_MAKE_DIR(const char *name, PRIntn mode)
+{
+    BOOL rv;
+    SECURITY_ATTRIBUTES sa;
+    LPSECURITY_ATTRIBUTES lpSA = NULL;
+    PSECURITY_DESCRIPTOR pSD = NULL;
+    PACL pACL = NULL;
+
+    if (_PR_NT_MakeSecurityDescriptorACL(mode, dirAccessTable,
+            &pSD, &pACL) == PR_SUCCESS) {
+        sa.nLength = sizeof(sa);
+        sa.lpSecurityDescriptor = pSD;
+        sa.bInheritHandle = FALSE;
+        lpSA = &sa;
+    }
+    rv = CreateDirectoryA(name, lpSA);
+    if (lpSA != NULL) {
+        _PR_NT_FreeSecurityDescriptorACL(pSD, pACL);
+    }
+    if (rv) {
+        return 0;
+    } else {
+        _PR_MD_MAP_MKDIR_ERROR(GetLastError());
+        return -1;
+    }
+}
+
+PRInt32
+_PR_MD_RMDIR(const char *name)
+{
+    if (RemoveDirectoryA(name)) {
+        return 0;
+    } else {
+		_PR_MD_MAP_RMDIR_ERROR(GetLastError());
+        return -1;
+    }
+}
+
+PRStatus
+_PR_MD_LOCKFILE(PROsfd f)
+{
+    PRStatus  rc = PR_SUCCESS;
+	DWORD     rv;
+
+	rv = LockFile( (HANDLE)f,
+		0l, 0l,
+		0x0l, 0xffffffffl ); 
+	if ( rv == 0 ) {
+        DWORD err = GetLastError();
+        _PR_MD_MAP_DEFAULT_ERROR(err);
+        PR_LOG( _pr_io_lm, PR_LOG_ERROR,
+            ("_PR_MD_LOCKFILE() failed. Error: %d", err ));
+        rc = PR_FAILURE;
+    }
+
+    return rc;
+} /* end _PR_MD_LOCKFILE() */
+
+PRStatus
+_PR_MD_TLOCKFILE(PROsfd f)
+{
+    PR_SetError( PR_NOT_IMPLEMENTED_ERROR, 0 );
+    return PR_FAILURE;
+} /* end _PR_MD_TLOCKFILE() */
+
+
+PRStatus
+_PR_MD_UNLOCKFILE(PROsfd f)
+{
+	PRInt32   rv;
+    
+    rv = UnlockFile( (HANDLE) f,
+    		0l, 0l,
+            0x0l, 0xffffffffl ); 
+            
+    if ( rv )
+    {
+    	return PR_SUCCESS;
+    }
+    else
+    {
+		_PR_MD_MAP_DEFAULT_ERROR(GetLastError());
+		return PR_FAILURE;
+    }
+} /* end _PR_MD_UNLOCKFILE() */
+
+PRInt32
+_PR_MD_PIPEAVAILABLE(PRFileDesc *fd)
+{
+    if (NULL == fd)
+		PR_SetError(PR_BAD_DESCRIPTOR_ERROR, 0);
+	else
+		PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
+    return -1;
+}
+
+#ifdef MOZ_UNICODE
+
+typedef HANDLE (WINAPI *CreateFileWFn) (LPCWSTR, DWORD, DWORD, LPSECURITY_ATTRIBUTES, DWORD, DWORD, HANDLE);
+static CreateFileWFn createFileW = CreateFileW;
+typedef HANDLE (WINAPI *FindFirstFileWFn) (LPCWSTR, LPWIN32_FIND_DATAW);
+static FindFirstFileWFn findFirstFileW = FindFirstFileW;
+typedef BOOL (WINAPI *FindNextFileWFn) (HANDLE, LPWIN32_FIND_DATAW);
+static FindNextFileWFn findNextFileW = FindNextFileW;
+typedef DWORD (WINAPI *GetFullPathNameWFn) (LPCWSTR, DWORD, LPWSTR, LPWSTR *);
+static GetFullPathNameWFn getFullPathNameW = GetFullPathNameW;
+typedef UINT (WINAPI *GetDriveTypeWFn) (LPCWSTR);
+static GetDriveTypeWFn getDriveTypeW = GetDriveTypeW;
+
+#endif /* MOZ_UNICODE */
+
+#ifdef MOZ_UNICODE
+
+/* ================ UTF16 Interfaces ================================ */
+static void FlipSlashesW(PRUnichar *cp, size_t len)
+{
+    while (len-- > 0) {
+        if (cp[0] == L'/') {
+            cp[0] = L'\\';
+        }
+        cp++;
+    }
+} /* end FlipSlashesW() */
+
+PROsfd
+_PR_MD_OPEN_FILE_UTF16(const PRUnichar *name, PRIntn osflags, int mode)
+{
+    HANDLE file;
+    PRInt32 access = 0;
+    PRInt32 flags = 0;
+    PRInt32 flag6 = 0;
+    SECURITY_ATTRIBUTES sa;
+    LPSECURITY_ATTRIBUTES lpSA = NULL;
+    PSECURITY_DESCRIPTOR pSD = NULL;
+    PACL pACL = NULL;
+
+    if (osflags & PR_CREATE_FILE) {
+        if (_PR_NT_MakeSecurityDescriptorACL(mode, fileAccessTable,
+                &pSD, &pACL) == PR_SUCCESS) {
+            sa.nLength = sizeof(sa);
+            sa.lpSecurityDescriptor = pSD;
+            sa.bInheritHandle = FALSE;
+            lpSA = &sa;
+        }
+    }
+
+    if (osflags & PR_SYNC) flag6 = FILE_FLAG_WRITE_THROUGH;
+
+    if (osflags & PR_RDONLY || osflags & PR_RDWR)
+        access |= GENERIC_READ;
+    if (osflags & PR_WRONLY || osflags & PR_RDWR)
+        access |= GENERIC_WRITE;
+ 
+    if ( osflags & PR_CREATE_FILE && osflags & PR_EXCL )
+        flags = CREATE_NEW;
+    else if (osflags & PR_CREATE_FILE) {
+        if (osflags & PR_TRUNCATE)
+            flags = CREATE_ALWAYS;
+        else
+            flags = OPEN_ALWAYS;
+    } else {
+        if (osflags & PR_TRUNCATE)
+            flags = TRUNCATE_EXISTING;
+        else
+            flags = OPEN_EXISTING;
+    }
+
+    file = createFileW(name,
+                       access,
+                       FILE_SHARE_READ|FILE_SHARE_WRITE,
+                       lpSA,
+                       flags,
+                       flag6,
+                       NULL);
+    if (lpSA != NULL) {
+        _PR_NT_FreeSecurityDescriptorACL(pSD, pACL);
+    }
+    if (file == INVALID_HANDLE_VALUE) {
+        _PR_MD_MAP_OPEN_ERROR(GetLastError());
+        return -1;
+    }
+ 
+    return (PROsfd)file;
+}
+ 
+PRStatus
+_PR_MD_OPEN_DIR_UTF16(_MDDirUTF16 *d, const PRUnichar *name)
+{
+    PRUnichar filename[ MAX_PATH ];
+    int len;
+
+    len = wcslen(name);
+    /* Need 5 bytes for \*.* and the trailing null byte. */
+    if (len + 5 > MAX_PATH) {
+        PR_SetError(PR_NAME_TOO_LONG_ERROR, 0);
+        return PR_FAILURE;
+    }
+    wcscpy(filename, name);
+
+    /*
+     * If 'name' ends in a slash or backslash, do not append
+     * another backslash.
+     */
+    if (filename[len - 1] == L'/' || filename[len - 1] == L'\\') {
+        len--;
+    }
+    wcscpy(&filename[len], L"\\*.*");
+    FlipSlashesW( filename, wcslen(filename) );
+
+    d->d_hdl = findFirstFileW( filename, &(d->d_entry) );
+    if ( d->d_hdl == INVALID_HANDLE_VALUE ) {
+        _PR_MD_MAP_OPENDIR_ERROR(GetLastError());
+        return PR_FAILURE;
+    }
+    d->firstEntry = PR_TRUE;
+    d->magic = _MD_MAGIC_DIR;
+    return PR_SUCCESS;
+}
+
+PRUnichar *
+_PR_MD_READ_DIR_UTF16(_MDDirUTF16 *d, PRIntn flags)
+{
+    PRInt32 err;
+    BOOL rv;
+    PRUnichar *fileName;
+
+    if ( d ) {
+        while (1) {
+            if (d->firstEntry) {
+                d->firstEntry = PR_FALSE;
+                rv = 1;
+            } else {
+                rv = findNextFileW(d->d_hdl, &(d->d_entry));
+            }
+            if (rv == 0) {
+                break;
+            }
+            fileName = GetFileFromDIR(d);
+            if ( (flags & PR_SKIP_DOT) &&
+                 (fileName[0] == L'.') && (fileName[1] == L'\0'))
+                continue;
+            if ( (flags & PR_SKIP_DOT_DOT) &&
+                 (fileName[0] == L'.') && (fileName[1] == L'.') &&
+                 (fileName[2] == L'\0'))
+                continue;
+            if ( (flags & PR_SKIP_HIDDEN) && FileIsHidden(d))
+                continue;
+            return fileName;
+        }
+        err = GetLastError();
+        PR_ASSERT(NO_ERROR != err);
+        _PR_MD_MAP_READDIR_ERROR(err);
+        return NULL;
+    }
+    PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+    return NULL;
+}
+ 
+PRInt32
+_PR_MD_CLOSE_DIR_UTF16(_MDDirUTF16 *d)
+{
+    if ( d ) {
+        if (FindClose(d->d_hdl)) {
+            d->magic = (PRUint32)-1;
+            return 0;
+        } else {
+            _PR_MD_MAP_CLOSEDIR_ERROR(GetLastError());
+            return -1;
+        }
+    }
+    PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+    return -1;
+}
+
+#define _PR_IS_W_SLASH(ch) ((ch) == L'/' || (ch) == L'\\')
+
+/*
+ * IsRootDirectoryW --
+ *
+ * Return PR_TRUE if the pathname 'fn' is a valid root directory,
+ * else return PR_FALSE.  The PRUnichar buffer pointed to by 'fn' must
+ * be writable.  During the execution of this function, the contents
+ * of the buffer pointed to by 'fn' may be modified, but on return
+ * the original contents will be restored.  'buflen' is the size of
+ * the buffer pointed to by 'fn', in PRUnichars.
+ *
+ * Root directories come in three formats:
+ * 1. / or \, meaning the root directory of the current drive.
+ * 2. C:/ or C:\, where C is a drive letter.
+ * 3. \\<server name>\<share point name>\ or
+ *    \\<server name>\<share point name>, meaning the root directory
+ *    of a UNC (Universal Naming Convention) name.
+ */
+
+static PRBool
+IsRootDirectoryW(PRUnichar *fn, size_t buflen)
+{
+    PRUnichar *p;
+    PRBool slashAdded = PR_FALSE;
+    PRBool rv = PR_FALSE;
+
+    if (_PR_IS_W_SLASH(fn[0]) && fn[1] == L'\0') {
+        return PR_TRUE;
+    }
+
+    if (iswalpha(fn[0]) && fn[1] == L':' && _PR_IS_W_SLASH(fn[2])
+            && fn[3] == L'\0') {
+        rv = getDriveTypeW(fn) > 1 ? PR_TRUE : PR_FALSE;
+        return rv;
+    }
+
+    /* The UNC root directory */
+
+    if (_PR_IS_W_SLASH(fn[0]) && _PR_IS_W_SLASH(fn[1])) {
+        /* The 'server' part should have at least one character. */
+        p = &fn[2];
+        if (*p == L'\0' || _PR_IS_W_SLASH(*p)) {
+            return PR_FALSE;
+        }
+
+        /* look for the next slash */
+        do {
+            p++;
+        } while (*p != L'\0' && !_PR_IS_W_SLASH(*p));
+        if (*p == L'\0') {
+            return PR_FALSE;
+        }
+
+        /* The 'share' part should have at least one character. */
+        p++;
+        if (*p == L'\0' || _PR_IS_W_SLASH(*p)) {
+            return PR_FALSE;
+        }
+
+        /* look for the final slash */
+        do {
+            p++;
+        } while (*p != L'\0' && !_PR_IS_W_SLASH(*p));
+        if (_PR_IS_W_SLASH(*p) && p[1] != L'\0') {
+            return PR_FALSE;
+        }
+        if (*p == L'\0') {
+            /*
+             * GetDriveType() doesn't work correctly if the
+             * path is of the form \\server\share, so we add
+             * a final slash temporarily.
+             */
+            if ((p + 1) < (fn + buflen)) {
+                *p++ = L'\\';
+                *p = L'\0';
+                slashAdded = PR_TRUE;
+            } else {
+                return PR_FALSE; /* name too long */
+            }
+        }
+        rv = getDriveTypeW(fn) > 1 ? PR_TRUE : PR_FALSE;
+        /* restore the 'fn' buffer */
+        if (slashAdded) {
+            *--p = L'\0';
+        }
+    }
+    return rv;
+}
+
+PRInt32
+_PR_MD_GETFILEINFO64_UTF16(const PRUnichar *fn, PRFileInfo64 *info)
+{
+    HANDLE hFindFile;
+    WIN32_FIND_DATAW findFileData;
+    PRUnichar pathbuf[MAX_PATH + 1];
+
+    if (NULL == fn || L'\0' == *fn) {
+        PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+        return -1;
+    }
+
+    /*
+     * FindFirstFile() expands wildcard characters.  So
+     * we make sure the pathname contains no wildcard.
+     */
+    if (NULL != wcspbrk(fn, L"?*")) {
+        PR_SetError(PR_FILE_NOT_FOUND_ERROR, 0);
+        return -1;
+    }
+
+    hFindFile = findFirstFileW(fn, &findFileData);
+    if (INVALID_HANDLE_VALUE == hFindFile) {
+        DWORD len;
+        PRUnichar *filePart;
+
+        /*
+         * FindFirstFile() does not work correctly on root directories.
+         * It also doesn't work correctly on a pathname that ends in a
+         * slash.  So we first check to see if the pathname specifies a
+         * root directory.  If not, and if the pathname ends in a slash,
+         * we remove the final slash and try again.
+         */
+
+        /*
+         * If the pathname does not contain ., \, and /, it cannot be
+         * a root directory or a pathname that ends in a slash.
+         */
+        if (NULL == wcspbrk(fn, L".\\/")) {
+            _PR_MD_MAP_OPENDIR_ERROR(GetLastError());
+            return -1;
+        } 
+        len = getFullPathNameW(fn, sizeof(pathbuf)/sizeof(pathbuf[0]), pathbuf,
+                &filePart);
+        if (0 == len) {
+            _PR_MD_MAP_OPENDIR_ERROR(GetLastError());
+            return -1;
+        }
+        if (len > sizeof(pathbuf)/sizeof(pathbuf[0])) {
+            PR_SetError(PR_NAME_TOO_LONG_ERROR, 0);
+            return -1;
+        }
+        if (IsRootDirectoryW(pathbuf, sizeof(pathbuf)/sizeof(pathbuf[0]))) {
+            info->type = PR_FILE_DIRECTORY;
+            info->size = 0;
+            /*
+             * These timestamps don't make sense for root directories.
+             */
+            info->modifyTime = 0;
+            info->creationTime = 0;
+            return 0;
+        }
+        if (!_PR_IS_W_SLASH(pathbuf[len - 1])) {
+            _PR_MD_MAP_OPENDIR_ERROR(GetLastError());
+            return -1;
+        } else {
+            pathbuf[len - 1] = L'\0';
+            hFindFile = findFirstFileW(pathbuf, &findFileData);
+            if (INVALID_HANDLE_VALUE == hFindFile) {
+                _PR_MD_MAP_OPENDIR_ERROR(GetLastError());
+                return -1;
+            }
+        }
+    }
+
+    FindClose(hFindFile);
+
+    if (findFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
+        info->type = PR_FILE_DIRECTORY;
+    } else {
+        info->type = PR_FILE_FILE;
+    }
+
+    info->size = findFileData.nFileSizeHigh;
+    info->size = (info->size << 32) + findFileData.nFileSizeLow;
+
+    _PR_FileTimeToPRTime(&findFileData.ftLastWriteTime, &info->modifyTime);
+
+    if (0 == findFileData.ftCreationTime.dwLowDateTime &&
+            0 == findFileData.ftCreationTime.dwHighDateTime) {
+        info->creationTime = info->modifyTime;
+    } else {
+        _PR_FileTimeToPRTime(&findFileData.ftCreationTime,
+                &info->creationTime);
+    }
+
+    return 0;
+}
+/* ================ end of UTF16 Interfaces ================================ */
+#endif /* MOZ_UNICODE */
diff --git a/nsprpub/pr/src/md/windows/w95sock.c b/nsprpub/pr/src/md/windows/w95sock.c
new file mode 100644
index 000000000..1c3ddd911
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/w95sock.c
@@ -0,0 +1,669 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Win95 Sockets module
+ *
+ */
+
+#include "primpl.h"
+
+#define READ_FD     1
+#define WRITE_FD    2
+#define CONNECT_FD  3
+
+static PRInt32 socket_io_wait(
+    PROsfd osfd, 
+    PRInt32 fd_type,
+    PRIntervalTime timeout);
+
+
+/* --- SOCKET IO --------------------------------------------------------- */
+
+static PRBool socketFixInet6RcvBuf = PR_FALSE;
+
+void _PR_MD_InitSockets(void)
+{
+    OSVERSIONINFO osvi;
+
+    memset(&osvi, 0, sizeof(osvi));
+    osvi.dwOSVersionInfoSize = sizeof(osvi);
+    GetVersionEx(&osvi);
+
+    if (osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 1)
+    {
+        /* if Windows XP (32-bit) */
+        socketFixInet6RcvBuf = PR_TRUE;
+    }
+}
+
+void _PR_MD_CleanupSockets(void)
+{
+    socketFixInet6RcvBuf = PR_FALSE;
+}
+
+PROsfd
+_PR_MD_SOCKET(int af, int type, int flags)
+{
+    SOCKET sock;
+    u_long one = 1;
+
+    sock = socket(af, type, flags);
+
+    if (sock == INVALID_SOCKET ) 
+    {
+        _PR_MD_MAP_SOCKET_ERROR(WSAGetLastError());
+        return (PROsfd)sock;
+    }
+
+    /*
+    ** Make the socket Non-Blocking
+    */
+    if (ioctlsocket( sock, FIONBIO, &one) != 0)
+    {
+        PR_SetError(PR_UNKNOWN_ERROR, WSAGetLastError());
+        closesocket(sock);
+        return -1;
+    }
+
+    if (af == AF_INET6 && socketFixInet6RcvBuf)
+    {
+        int bufsize;
+        int len = sizeof(bufsize);
+        int rv;
+
+        /* Windows XP 32-bit returns an error on getpeername() for AF_INET6
+         * sockets if the receive buffer size is greater than 65535 before
+         * the connection is initiated. The default receive buffer size may
+         * be 128000 so fix it here to always be <= 65535. See bug 513659
+         * and IBM DB2 support technote "Receive/Send IPv6 Socket Size
+         * Problem in Windows XP SP2 & SP3".
+         */
+        rv = getsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char*)&bufsize, &len);
+        if (rv == 0 && bufsize > 65535)
+        {
+            bufsize = 65535;
+            setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char*)&bufsize, len);
+        }
+    }
+
+    return (PROsfd)sock;
+}
+
+/*
+** _MD_CloseSocket() -- Close a socket
+**
+*/
+PRInt32
+_MD_CloseSocket(PROsfd osfd)
+{
+    PRInt32 rv;
+
+    rv = closesocket((SOCKET) osfd );
+    if (rv < 0)
+        _PR_MD_MAP_CLOSE_ERROR(WSAGetLastError());
+
+    return rv;
+}
+
+PRInt32
+_MD_SocketAvailable(PRFileDesc *fd)
+{
+    PRInt32 result;
+
+    if (ioctlsocket(fd->secret->md.osfd, FIONREAD, &result) < 0) {
+        PR_SetError(PR_BAD_DESCRIPTOR_ERROR, WSAGetLastError());
+        return -1;
+    }
+    return result;
+}
+
+PROsfd _MD_Accept(
+    PRFileDesc *fd, 
+    PRNetAddr *raddr, 
+    PRUint32 *rlen,
+    PRIntervalTime timeout )
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    SOCKET sock;
+    PRInt32 rv, err;
+
+    while ((sock = accept(osfd, (struct sockaddr *) raddr, rlen)) == -1) 
+    {
+        err = WSAGetLastError();
+        if ((err == WSAEWOULDBLOCK) && (!fd->secret->nonblocking))
+        {
+            if ((rv = socket_io_wait(osfd, READ_FD, timeout)) < 0)
+            {
+                break;
+            }
+        }
+        else
+        {
+            _PR_MD_MAP_ACCEPT_ERROR(err);
+            break;
+        }
+    }
+    return(sock);
+} /* end _MD_accept() */
+
+PRInt32
+_PR_MD_CONNECT(PRFileDesc *fd, const PRNetAddr *addr, PRUint32 addrlen, 
+               PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    PRInt32 rv;
+    int     err;
+
+    if ((rv = connect(osfd, (struct sockaddr *) addr, addrlen)) == -1) 
+    {
+        err = WSAGetLastError();
+        if ((!fd->secret->nonblocking) && (err == WSAEWOULDBLOCK))
+        {
+            rv = socket_io_wait(osfd, CONNECT_FD, timeout);
+            if ( rv < 0 )
+            {
+                return(-1);
+            }
+            else
+            {
+                PR_ASSERT(rv > 0);
+                /* it's connected */
+                return(0);
+            } 
+        }
+        _PR_MD_MAP_CONNECT_ERROR(err);
+    }
+    return rv;
+}
+
+PRInt32
+_PR_MD_BIND(PRFileDesc *fd, const PRNetAddr *addr, PRUint32 addrlen)
+{
+    PRInt32 rv;
+
+    rv = bind(fd->secret->md.osfd, (const struct sockaddr *)&(addr->inet), addrlen);
+
+    if (rv == SOCKET_ERROR)  {
+        _PR_MD_MAP_BIND_ERROR(WSAGetLastError());
+        return -1;
+    }
+
+    return 0;
+}
+
+PRInt32
+_PR_MD_LISTEN(PRFileDesc *fd, PRIntn backlog)
+{
+    PRInt32 rv;
+
+    rv = listen(fd->secret->md.osfd, backlog);
+
+    if (rv == SOCKET_ERROR)  {
+        _PR_MD_MAP_DEFAULT_ERROR(WSAGetLastError());
+        return -1;
+    }
+
+    return 0;
+}
+
+PRInt32
+_PR_MD_RECV(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags, 
+            PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    int osflags;
+
+    if (0 == flags) {
+        osflags = 0;
+    } else {
+        PR_ASSERT(PR_MSG_PEEK == flags);
+        osflags = MSG_PEEK;
+    }
+    while ((rv = recv( osfd, buf, amount, osflags)) == -1) 
+    {
+        if (((err = WSAGetLastError()) == WSAEWOULDBLOCK) 
+            && (!fd->secret->nonblocking))
+        {
+            rv = socket_io_wait(osfd, READ_FD, timeout);
+            if ( rv < 0 )
+            {
+                return -1;
+            } 
+        } 
+        else 
+        {
+            _PR_MD_MAP_RECV_ERROR(err);
+            break;
+        }
+    } /* end while() */
+    return(rv);
+}
+
+PRInt32
+_PR_MD_SEND(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+            PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRInt32 bytesSent = 0;
+
+    while(bytesSent < amount ) 
+    {
+        while ((rv = send( osfd, buf, amount, 0 )) == -1) 
+        {
+            if (((err = WSAGetLastError()) == WSAEWOULDBLOCK) 
+                && (!fd->secret->nonblocking))
+            {
+                rv = socket_io_wait(osfd, WRITE_FD, timeout);
+                if ( rv < 0 )
+                {
+                    return -1;
+                }
+            } 
+            else 
+            {
+                _PR_MD_MAP_SEND_ERROR(err);
+                return -1;
+            }
+        }
+        bytesSent += rv;
+        if (fd->secret->nonblocking)
+        {
+            break;
+        }
+        if (bytesSent < amount) 
+        {
+            rv = socket_io_wait(osfd, WRITE_FD, timeout);
+            if ( rv < 0 )
+            {
+                return -1;
+            }
+        }
+    }
+    return bytesSent;
+}
+
+PRInt32
+_PR_MD_SENDTO(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+              const PRNetAddr *addr, PRUint32 addrlen, PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+    PRInt32 bytesSent = 0;
+
+    while(bytesSent < amount) 
+    {
+        while ((rv = sendto( osfd, buf, amount, 0, (struct sockaddr *) addr,
+                addrlen)) == -1) 
+        {
+            if (((err = WSAGetLastError()) == WSAEWOULDBLOCK) 
+                && (!fd->secret->nonblocking))
+            {
+                rv = socket_io_wait(osfd, WRITE_FD, timeout);
+                if ( rv < 0 )
+                {
+                    return -1;
+                }
+            } 
+            else 
+            {
+                _PR_MD_MAP_SENDTO_ERROR(err);
+                return -1;
+            }
+        }
+        bytesSent += rv;
+        if (fd->secret->nonblocking)
+        {
+            break;
+        }
+        if (bytesSent < amount) 
+        {
+            rv = socket_io_wait(osfd, WRITE_FD, timeout);
+            if (rv < 0) 
+            {
+                return -1;
+            }
+        }
+    }
+    return bytesSent;
+}
+
+PRInt32
+_PR_MD_RECVFROM(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+                PRNetAddr *addr, PRUint32 *addrlen, PRIntervalTime timeout)
+{
+    PROsfd osfd = fd->secret->md.osfd;
+    PRInt32 rv, err;
+
+    while ((rv = recvfrom( osfd, buf, amount, 0, (struct sockaddr *) addr,
+            addrlen)) == -1) 
+    {
+        if (((err = WSAGetLastError()) == WSAEWOULDBLOCK) 
+            && (!fd->secret->nonblocking))
+        {
+            rv = socket_io_wait(osfd, READ_FD, timeout);
+            if ( rv < 0)
+            {
+                return -1;
+            } 
+        } 
+        else 
+        {
+            _PR_MD_MAP_RECVFROM_ERROR(err);
+            break;
+        }
+    }
+    return(rv);
+}
+
+PRInt32
+_PR_MD_WRITEV(PRFileDesc *fd, const PRIOVec *iov, PRInt32 iov_size, PRIntervalTime timeout)
+{
+    int index;
+    int sent = 0;
+    int rv;
+
+    for (index=0; index < iov_size; index++) 
+    {
+        rv = _PR_MD_SEND(fd, iov[index].iov_base, iov[index].iov_len, 0, timeout);
+        if (rv > 0) 
+            sent += rv;
+        if ( rv != iov[index].iov_len ) 
+        {
+            if (rv < 0)
+            {
+                if (fd->secret->nonblocking
+                    && (PR_GetError() == PR_WOULD_BLOCK_ERROR)
+                    && (sent > 0))
+                {
+                    return sent;
+                }
+                else
+                {
+                    return -1;
+                }
+            }
+            /* Only a nonblocking socket can have partial sends */
+            PR_ASSERT(fd->secret->nonblocking);
+            return sent;
+        }
+    }
+    return sent;
+}
+
+PRInt32
+_PR_MD_SHUTDOWN(PRFileDesc *fd, PRIntn how)
+{
+PRInt32 rv;
+
+    rv = shutdown(fd->secret->md.osfd, how);
+    if (rv < 0)
+        _PR_MD_MAP_SHUTDOWN_ERROR(WSAGetLastError());
+    return rv;
+}
+
+PRStatus
+_PR_MD_GETSOCKNAME(PRFileDesc *fd, PRNetAddr *addr, PRUint32 *len)
+{
+    PRInt32 rv;
+
+    rv = getsockname((SOCKET)fd->secret->md.osfd, (struct sockaddr *)addr, len);
+    if (rv==0) {
+        return PR_SUCCESS;
+    } else {
+        _PR_MD_MAP_GETSOCKNAME_ERROR(WSAGetLastError());
+        return PR_FAILURE;
+    }
+}
+
+PRStatus
+_PR_MD_GETPEERNAME(PRFileDesc *fd, PRNetAddr *addr, PRUint32 *len)
+{
+    PRInt32 rv;
+
+    rv = getpeername((SOCKET)fd->secret->md.osfd, (struct sockaddr *)addr, len);
+    if (rv==0) {
+        return PR_SUCCESS;
+    } else {
+        _PR_MD_MAP_GETPEERNAME_ERROR(WSAGetLastError());
+        return PR_FAILURE;
+    }
+}
+
+PRStatus
+_PR_MD_GETSOCKOPT(PRFileDesc *fd, PRInt32 level, PRInt32 optname, char* optval, PRInt32* optlen)
+{
+    PRInt32 rv;
+
+    rv = getsockopt((SOCKET)fd->secret->md.osfd, level, optname, optval, optlen);
+    if (rv==0) {
+        return PR_SUCCESS;
+    } else {
+        _PR_MD_MAP_GETSOCKOPT_ERROR(WSAGetLastError());
+        return PR_FAILURE;
+    }
+}
+
+PRStatus
+_PR_MD_SETSOCKOPT(PRFileDesc *fd, PRInt32 level, PRInt32 optname, const char* optval, PRInt32 optlen)
+{
+    PRInt32 rv;
+
+    rv = setsockopt((SOCKET)fd->secret->md.osfd, level, optname, optval, optlen);
+    if (rv==0) {
+        return PR_SUCCESS;
+    } else {
+        _PR_MD_MAP_SETSOCKOPT_ERROR(WSAGetLastError());
+        return PR_FAILURE;
+    }
+}
+
+void
+_MD_MakeNonblock(PRFileDesc *f)
+{
+    return; /* do nothing */
+}
+
+
+
+/*
+ * socket_io_wait --
+ *
+ * Wait for socket i/o, periodically checking for interrupt.
+ *
+ * This function returns 1 on success.  On failure, it returns
+ * -1 and sets the error codes.  It never returns 0.
+ */
+#define _PR_INTERRUPT_CHECK_INTERVAL_SECS 5
+
+static PRInt32 socket_io_wait(
+    PROsfd osfd, 
+    PRInt32 fd_type,
+    PRIntervalTime timeout)
+{
+    PRInt32 rv = -1;
+    struct timeval tv;
+    PRThread *me = _PR_MD_CURRENT_THREAD();
+    PRIntervalTime elapsed, remaining;
+    PRBool wait_for_remaining;
+    fd_set rd_wr, ex;
+    int err, len;
+
+    switch (timeout) {
+        case PR_INTERVAL_NO_WAIT:
+            PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+            break;
+        case PR_INTERVAL_NO_TIMEOUT:
+            /*
+             * This is a special case of the 'default' case below.
+             * Please see the comments there.
+             */
+            tv.tv_sec = _PR_INTERRUPT_CHECK_INTERVAL_SECS;
+            tv.tv_usec = 0;
+            FD_ZERO(&rd_wr);
+            FD_ZERO(&ex);
+            do {
+                FD_SET(osfd, &rd_wr);
+                FD_SET(osfd, &ex);
+                switch( fd_type )
+                {
+                    case READ_FD:
+                        rv = _MD_SELECT(0, &rd_wr, NULL, NULL, &tv);
+                        break;
+                    case WRITE_FD:
+                        rv = _MD_SELECT(0, NULL, &rd_wr, NULL, &tv);
+                        break;
+                    case CONNECT_FD:
+                        rv = _MD_SELECT(0, NULL, &rd_wr, &ex, &tv);
+                        break;
+                    default:
+                        PR_ASSERT(0);
+                        break;
+                } /* end switch() */
+                if (rv == -1 )
+                {
+                    _PR_MD_MAP_SELECT_ERROR(WSAGetLastError());
+                    break;
+                }
+                if ( rv > 0 && fd_type == CONNECT_FD )
+                {
+                    /*
+                     * Call Sleep(0) to work around a Winsock timing bug.
+                     */
+                    Sleep(0);
+                    if (FD_ISSET((SOCKET)osfd, &ex))
+                    {
+                        len = sizeof(err);
+                        if (getsockopt(osfd, SOL_SOCKET, SO_ERROR,
+                                (char *) &err, &len) == SOCKET_ERROR)
+                        {  
+                            _PR_MD_MAP_GETSOCKOPT_ERROR(WSAGetLastError());
+                            return -1;
+                        }
+                        if (err != 0)
+                            _PR_MD_MAP_CONNECT_ERROR(err);
+                        else
+                            PR_SetError(PR_UNKNOWN_ERROR, 0);
+                        return -1;
+                    }
+                    if (FD_ISSET((SOCKET)osfd, &rd_wr))
+                    {
+                        /* it's connected */
+                        return 1;
+                    }
+                    PR_ASSERT(0);
+                }
+                if (_PR_PENDING_INTERRUPT(me)) {
+                    me->flags &= ~_PR_INTERRUPT;
+                    PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+                    rv = -1;
+                    break;
+                }
+            } while (rv == 0);
+            break;
+        default:
+            remaining = timeout;
+            FD_ZERO(&rd_wr);
+            FD_ZERO(&ex);
+            do {
+                /*
+                 * We block in _MD_SELECT for at most
+                 * _PR_INTERRUPT_CHECK_INTERVAL_SECS seconds,
+                 * so that there is an upper limit on the delay
+                 * before the interrupt bit is checked.
+                 */
+                wait_for_remaining = PR_TRUE;
+                tv.tv_sec = PR_IntervalToSeconds(remaining);
+                if (tv.tv_sec > _PR_INTERRUPT_CHECK_INTERVAL_SECS) {
+                    wait_for_remaining = PR_FALSE;
+                    tv.tv_sec = _PR_INTERRUPT_CHECK_INTERVAL_SECS;
+                    tv.tv_usec = 0;
+                } else {
+                    tv.tv_usec = PR_IntervalToMicroseconds(
+                        remaining -
+                        PR_SecondsToInterval(tv.tv_sec));
+                }
+                FD_SET(osfd, &rd_wr);
+                FD_SET(osfd, &ex);
+                switch( fd_type )
+                {
+                    case READ_FD:
+                        rv = _MD_SELECT(0, &rd_wr, NULL, NULL, &tv);
+                        break;
+                    case WRITE_FD:
+                        rv = _MD_SELECT(0, NULL, &rd_wr, NULL, &tv);
+                        break;
+                    case CONNECT_FD:
+                        rv = _MD_SELECT(0, NULL, &rd_wr, &ex, &tv);
+                        break;
+                    default:
+                        PR_ASSERT(0);
+                        break;
+                } /* end switch() */
+                if (rv == -1)
+                {
+                    _PR_MD_MAP_SELECT_ERROR(WSAGetLastError());
+                    break;
+                }
+                if ( rv > 0 && fd_type == CONNECT_FD )
+                {
+                    /*
+                     * Call Sleep(0) to work around a Winsock timing bug.
+                     */
+                    Sleep(0);
+                    if (FD_ISSET((SOCKET)osfd, &ex))
+                    {
+                        len = sizeof(err);
+                        if (getsockopt(osfd, SOL_SOCKET, SO_ERROR,
+                                (char *) &err, &len) == SOCKET_ERROR)
+                        {  
+                            _PR_MD_MAP_GETSOCKOPT_ERROR(WSAGetLastError());
+                            return -1;
+                        }
+                        if (err != 0)
+                            _PR_MD_MAP_CONNECT_ERROR(err);
+                        else
+                            PR_SetError(PR_UNKNOWN_ERROR, 0);
+                        return -1;
+                    }
+                    if (FD_ISSET((SOCKET)osfd, &rd_wr))
+                    {
+                        /* it's connected */
+                        return 1;
+                    }
+                    PR_ASSERT(0);
+                }
+                if (_PR_PENDING_INTERRUPT(me)) {
+                    me->flags &= ~_PR_INTERRUPT;
+                    PR_SetError(PR_PENDING_INTERRUPT_ERROR, 0);
+                    rv = -1;
+                    break;
+                }
+                /*
+                 * We loop again if _MD_SELECT timed out and the
+                 * timeout deadline has not passed yet.
+                 */
+                if (rv == 0 )
+                {
+                    if (wait_for_remaining) {
+                        elapsed = remaining;
+                    } else {
+                        elapsed = PR_SecondsToInterval(tv.tv_sec) 
+                                    + PR_MicrosecondsToInterval(tv.tv_usec);
+                    }
+                    if (elapsed >= remaining) {
+                        PR_SetError(PR_IO_TIMEOUT_ERROR, 0);
+                        rv = -1;
+                        break;
+                    } else {
+                        remaining = remaining - elapsed;
+                    }
+                }
+            } while (rv == 0 );
+            break;
+    }
+    return(rv);
+} /* end socket_io_wait() */
diff --git a/nsprpub/pr/src/md/windows/w95thred.c b/nsprpub/pr/src/md/windows/w95thred.c
new file mode 100644
index 000000000..c27d982a7
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/w95thred.c
@@ -0,0 +1,325 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "primpl.h"
+#include <process.h>  /* for _beginthreadex() */
+
+#if defined(_MSC_VER) && _MSC_VER <= 1200
+/*
+ * VC++ 6.0 doesn't have DWORD_PTR.
+ */
+
+typedef DWORD DWORD_PTR;
+#endif /* _MSC_VER <= 1200 */
+
+/* --- globals ------------------------------------------------ */
+#ifdef _PR_USE_STATIC_TLS
+__declspec(thread) struct PRThread  *_pr_thread_last_run;
+__declspec(thread) struct PRThread  *_pr_currentThread;
+__declspec(thread) struct _PRCPU    *_pr_currentCPU;
+#else
+DWORD _pr_currentThreadIndex;
+DWORD _pr_lastThreadIndex;
+DWORD _pr_currentCPUIndex;
+#endif
+int                           _pr_intsOff = 0; 
+_PRInterruptTable             _pr_interruptTable[] = { { 0 } };
+
+void
+_PR_MD_EARLY_INIT()
+{
+#ifndef _PR_USE_STATIC_TLS
+    _pr_currentThreadIndex = TlsAlloc();
+    _pr_lastThreadIndex = TlsAlloc();
+    _pr_currentCPUIndex = TlsAlloc();
+#endif
+}
+
+void _PR_MD_CLEANUP_BEFORE_EXIT(void)
+{
+    _PR_NT_FreeSids();
+
+    _PR_MD_CleanupSockets();
+
+    WSACleanup();
+
+#ifndef _PR_USE_STATIC_TLS
+    TlsFree(_pr_currentThreadIndex);
+    TlsFree(_pr_lastThreadIndex);
+    TlsFree(_pr_currentCPUIndex);
+#endif
+}
+
+PRStatus
+_PR_MD_INIT_THREAD(PRThread *thread)
+{
+    if (thread->flags & (_PR_PRIMORDIAL | _PR_ATTACHED)) {
+        /*
+        ** Warning:
+        ** --------
+        ** NSPR requires a real handle to every thread.
+        ** GetCurrentThread() returns a pseudo-handle which
+        ** is not suitable for some thread operations (e.g.,
+        ** suspending).  Therefore, get a real handle from
+        ** the pseudo handle via DuplicateHandle(...)
+        */
+        BOOL ok = DuplicateHandle(
+                GetCurrentProcess(),     /* Process of source handle */
+                GetCurrentThread(),      /* Pseudo Handle to dup */
+                GetCurrentProcess(),     /* Process of handle */
+                &(thread->md.handle),    /* resulting handle */
+                0L,                      /* access flags */
+                FALSE,                   /* Inheritable */
+                DUPLICATE_SAME_ACCESS);  /* Options */
+        if (!ok) {
+            return PR_FAILURE;
+        }
+        thread->id = GetCurrentThreadId();
+        thread->md.id = thread->id;
+    }
+
+    /* Create the blocking IO semaphore */
+    thread->md.blocked_sema = CreateSemaphore(NULL, 0, 1, NULL);
+    if (thread->md.blocked_sema == NULL)
+        return PR_FAILURE;
+	else
+		return PR_SUCCESS;
+}
+
+static unsigned __stdcall
+pr_root(void *arg)
+{
+    PRThread *thread = (PRThread *)arg;
+    thread->md.start(thread);
+    return 0;
+}
+
+PRStatus 
+_PR_MD_CREATE_THREAD(PRThread *thread, 
+                  void (*start)(void *), 
+                  PRThreadPriority priority, 
+                  PRThreadScope scope, 
+                  PRThreadState state, 
+                  PRUint32 stackSize)
+{
+
+    thread->md.start = start;
+    thread->md.handle = (HANDLE) _beginthreadex(
+                    NULL,
+                    thread->stack->stackSize,
+                    pr_root,
+                    (void *)thread,
+                    CREATE_SUSPENDED | STACK_SIZE_PARAM_IS_A_RESERVATION,
+                    &(thread->id));
+    if(!thread->md.handle) {
+        return PR_FAILURE;
+    }
+
+    thread->md.id = thread->id;
+    /*
+     * On windows, a thread is created with a thread priority of
+     * THREAD_PRIORITY_NORMAL.
+     */
+    if (priority != PR_PRIORITY_NORMAL) {
+        _PR_MD_SET_PRIORITY(&(thread->md), priority);
+    }
+
+    /* Activate the thread */
+    if ( ResumeThread( thread->md.handle ) != -1)
+        return PR_SUCCESS;
+
+    return PR_FAILURE;
+}
+
+void    
+_PR_MD_YIELD(void)
+{
+    /* Can NT really yield at all? */
+    Sleep(0);
+}
+
+void     
+_PR_MD_SET_PRIORITY(_MDThread *thread, PRThreadPriority newPri)
+{
+    int nativePri;
+    BOOL rv;
+
+    if (newPri < PR_PRIORITY_FIRST) {
+        newPri = PR_PRIORITY_FIRST;
+    } else if (newPri > PR_PRIORITY_LAST) {
+        newPri = PR_PRIORITY_LAST;
+    }
+    switch (newPri) {
+        case PR_PRIORITY_LOW:
+            nativePri = THREAD_PRIORITY_BELOW_NORMAL;
+            break;
+        case PR_PRIORITY_NORMAL:
+            nativePri = THREAD_PRIORITY_NORMAL;
+            break;
+        case PR_PRIORITY_HIGH:
+            nativePri = THREAD_PRIORITY_ABOVE_NORMAL;
+            break;
+        case PR_PRIORITY_URGENT:
+            nativePri = THREAD_PRIORITY_HIGHEST;
+    }
+    rv = SetThreadPriority(thread->handle, nativePri);
+    PR_ASSERT(rv);
+    if (!rv) {
+	PR_LOG(_pr_thread_lm, PR_LOG_MIN,
+                ("PR_SetThreadPriority: can't set thread priority\n"));
+    }
+    return;
+}
+
+const DWORD MS_VC_EXCEPTION = 0x406D1388;
+
+#pragma pack(push,8)
+typedef struct tagTHREADNAME_INFO
+{
+   DWORD dwType; // Must be 0x1000.
+   LPCSTR szName; // Pointer to name (in user addr space).
+   DWORD dwThreadID; // Thread ID (-1=caller thread).
+   DWORD dwFlags; // Reserved for future use, must be zero.
+} THREADNAME_INFO;
+#pragma pack(pop)
+
+void
+_PR_MD_SET_CURRENT_THREAD_NAME(const char *name)
+{
+#ifdef _MSC_VER
+   THREADNAME_INFO info;
+
+   if (!IsDebuggerPresent())
+      return;
+
+   info.dwType = 0x1000;
+   info.szName = (char*) name;
+   info.dwThreadID = -1;
+   info.dwFlags = 0;
+
+   __try {
+      RaiseException(MS_VC_EXCEPTION,
+                     0,
+                     sizeof(info) / sizeof(ULONG_PTR),
+                     (ULONG_PTR*)&info);
+   } __except(EXCEPTION_CONTINUE_EXECUTION) {
+   }
+#endif
+}
+
+void
+_PR_MD_CLEAN_THREAD(PRThread *thread)
+{
+    BOOL rv;
+
+    if (thread->md.blocked_sema) {
+        rv = CloseHandle(thread->md.blocked_sema);
+        PR_ASSERT(rv);
+        thread->md.blocked_sema = 0;
+    }
+
+    if (thread->md.handle) {
+        rv = CloseHandle(thread->md.handle);
+        PR_ASSERT(rv);
+        thread->md.handle = 0;
+    }
+}
+
+void
+_PR_MD_EXIT_THREAD(PRThread *thread)
+{
+    _PR_MD_CLEAN_THREAD(thread);
+    _PR_MD_SET_CURRENT_THREAD(NULL);
+}
+
+
+void
+_PR_MD_EXIT(PRIntn status)
+{
+    _exit(status);
+}
+
+PRInt32 _PR_MD_SETTHREADAFFINITYMASK(PRThread *thread, PRUint32 mask )
+{
+#ifdef WINCE
+    SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
+    return -1;
+#else
+    DWORD_PTR rv;
+
+    rv = SetThreadAffinityMask(thread->md.handle, mask);
+
+    return rv?0:-1;
+#endif
+}
+
+PRInt32 _PR_MD_GETTHREADAFFINITYMASK(PRThread *thread, PRUint32 *mask)
+{
+#ifdef WINCE
+    SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
+    return -1;
+#else
+    BOOL rv;
+    DWORD_PTR process_mask;
+    DWORD_PTR system_mask;
+
+    rv = GetProcessAffinityMask(GetCurrentProcess(),
+            &process_mask, &system_mask);
+    if (rv)
+        *mask = (PRUint32)process_mask;
+
+    return rv?0:-1;
+#endif
+}
+
+void 
+_PR_MD_SUSPEND_CPU(_PRCPU *cpu) 
+{
+    _PR_MD_SUSPEND_THREAD(cpu->thread);
+}
+
+void
+_PR_MD_RESUME_CPU(_PRCPU *cpu)
+{
+    _PR_MD_RESUME_THREAD(cpu->thread);
+}
+
+void
+_PR_MD_SUSPEND_THREAD(PRThread *thread)
+{
+    if (_PR_IS_NATIVE_THREAD(thread)) {
+        DWORD previousSuspendCount;
+        /* XXXMB - SuspendThread() is not a blocking call; how do we
+         * know when the thread is *REALLY* suspended?
+         */
+        previousSuspendCount = SuspendThread(thread->md.handle);
+        PR_ASSERT(previousSuspendCount == 0);
+    }
+}
+
+void
+_PR_MD_RESUME_THREAD(PRThread *thread)
+{
+    if (_PR_IS_NATIVE_THREAD(thread)) {
+        DWORD previousSuspendCount;
+        previousSuspendCount = ResumeThread(thread->md.handle);
+        PR_ASSERT(previousSuspendCount == 1);
+    }
+}
+
+PRThread*
+_MD_CURRENT_THREAD(void)
+{
+PRThread *thread;
+
+	thread = _MD_GET_ATTACHED_THREAD();
+
+   	if (NULL == thread) {
+		thread = _PRI_AttachThread(
+            PR_USER_THREAD, PR_PRIORITY_NORMAL, NULL, 0);
+	}
+	PR_ASSERT(thread != NULL);
+	return thread;
+}
diff --git a/nsprpub/pr/src/md/windows/win32_errors.c b/nsprpub/pr/src/md/windows/win32_errors.c
new file mode 100644
index 000000000..d26820a7a
--- /dev/null
+++ b/nsprpub/pr/src/md/windows/win32_errors.c
@@ -0,0 +1,533 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "prerror.h"
+#include "prlog.h"
+#include <errno.h>
+#include <windows.h>
+
+/*
+ * On Win32, we map three kinds of error codes:
+ * - GetLastError(): for Win32 functions
+ * - WSAGetLastError(): for Winsock functions
+ * - errno: for standard C library functions
+ * 
+ * GetLastError() and WSAGetLastError() return error codes in
+ * non-overlapping ranges, so their error codes (ERROR_* and
+ * WSAE*) can be mapped by the same function.  On the other hand,
+ * errno and GetLastError() have overlapping ranges, so we need
+ * to use a separate function to map errno.
+ *
+ * We do not check for WSAEINPROGRESS and WSAEINTR because we do not
+ * use blocking Winsock 1.1 calls.
+ *
+ * Except for the 'socket' call, we do not check for WSAEINITIALISED.
+ * It is assumed that if Winsock is not initialized, that fact will
+ * be detected at the time we create new sockets.
+ */
+
+static void _MD_win32_map_default_errno(PRInt32 err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case EACCES:
+            prError = PR_NO_ACCESS_RIGHTS_ERROR;
+            break;
+        case ENOENT:
+            prError = PR_FILE_NOT_FOUND_ERROR;
+            break;
+        default:
+            prError = PR_UNKNOWN_ERROR;
+            break;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_win32_map_default_error(PRInt32 err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case ERROR_ACCESS_DENIED:
+            prError = PR_NO_ACCESS_RIGHTS_ERROR;
+            break;
+        case ERROR_ALREADY_EXISTS:
+            prError = PR_FILE_EXISTS_ERROR;
+            break;
+        case ERROR_CALL_NOT_IMPLEMENTED:
+            prError = PR_NOT_IMPLEMENTED_ERROR;
+            break;
+        case ERROR_DISK_CORRUPT:
+            prError = PR_IO_ERROR; 
+            break;
+        case ERROR_DISK_FULL:
+            prError = PR_NO_DEVICE_SPACE_ERROR;
+            break;
+        case ERROR_DISK_OPERATION_FAILED:
+            prError = PR_IO_ERROR;
+            break;
+        case ERROR_DRIVE_LOCKED:
+            prError = PR_FILE_IS_LOCKED_ERROR;
+            break;
+        case ERROR_FILENAME_EXCED_RANGE:
+            prError = PR_NAME_TOO_LONG_ERROR;
+            break;
+        case ERROR_FILE_CORRUPT:
+            prError = PR_IO_ERROR;
+            break;
+        case ERROR_FILE_EXISTS:
+            prError = PR_FILE_EXISTS_ERROR;
+            break;
+        case ERROR_FILE_INVALID:
+            prError = PR_BAD_DESCRIPTOR_ERROR;
+            break;
+        case ERROR_FILE_NOT_FOUND:
+            prError = PR_FILE_NOT_FOUND_ERROR;
+            break;
+        case ERROR_HANDLE_DISK_FULL:
+            prError = PR_NO_DEVICE_SPACE_ERROR;
+            break;
+        case ERROR_INVALID_ADDRESS:
+            prError = PR_ACCESS_FAULT_ERROR;
+            break;
+        case ERROR_INVALID_HANDLE:
+            prError = PR_BAD_DESCRIPTOR_ERROR;
+            break;
+        case ERROR_INVALID_NAME:
+            prError = PR_INVALID_ARGUMENT_ERROR;
+            break;
+        case ERROR_INVALID_PARAMETER:
+            prError = PR_INVALID_ARGUMENT_ERROR;
+            break;
+        case ERROR_INVALID_USER_BUFFER:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        case ERROR_LOCKED:
+            prError = PR_FILE_IS_LOCKED_ERROR;
+            break;
+        case ERROR_NETNAME_DELETED:
+            prError = PR_CONNECT_RESET_ERROR;
+            break;
+        case ERROR_NOACCESS:
+            prError = PR_ACCESS_FAULT_ERROR;
+            break;
+        case ERROR_NOT_ENOUGH_MEMORY:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        case ERROR_NOT_ENOUGH_QUOTA:
+            prError = PR_OUT_OF_MEMORY_ERROR;
+            break;
+        case ERROR_NOT_READY:
+            prError = PR_IO_ERROR;
+            break;
+        case ERROR_NO_MORE_FILES:
+            prError = PR_NO_MORE_FILES_ERROR;
+            break;
+        case ERROR_OPEN_FAILED:
+            prError = PR_IO_ERROR;
+            break;
+        case ERROR_OPEN_FILES:
+            prError = PR_IO_ERROR;
+            break;
+        case ERROR_OPERATION_ABORTED:
+            prError = PR_OPERATION_ABORTED_ERROR;
+            break;
+        case ERROR_OUTOFMEMORY:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        case ERROR_PATH_BUSY:
+            prError = PR_IO_ERROR;
+            break;
+        case ERROR_PATH_NOT_FOUND:
+            prError = PR_FILE_NOT_FOUND_ERROR;
+            break;
+        case ERROR_SEEK_ON_DEVICE:
+            prError = PR_IO_ERROR;
+            break;
+        case ERROR_SHARING_VIOLATION:
+            prError = PR_FILE_IS_BUSY_ERROR;
+            break;
+        case ERROR_STACK_OVERFLOW:
+            prError = PR_ACCESS_FAULT_ERROR;
+            break;
+        case ERROR_TOO_MANY_OPEN_FILES:
+            prError = PR_SYS_DESC_TABLE_FULL_ERROR;
+            break;
+        case ERROR_WRITE_PROTECT:
+            prError = PR_NO_ACCESS_RIGHTS_ERROR;
+            break;
+        case WSAEACCES:
+            prError = PR_NO_ACCESS_RIGHTS_ERROR;
+            break;
+        case WSAEADDRINUSE:
+            prError = PR_ADDRESS_IN_USE_ERROR;
+            break;
+        case WSAEADDRNOTAVAIL:
+            prError = PR_ADDRESS_NOT_AVAILABLE_ERROR;
+            break;
+        case WSAEAFNOSUPPORT:
+            prError = PR_ADDRESS_NOT_SUPPORTED_ERROR;
+            break;
+        case WSAEALREADY:
+            prError = PR_ALREADY_INITIATED_ERROR;
+            break;
+        case WSAEBADF:
+            prError = PR_BAD_DESCRIPTOR_ERROR;
+            break;
+        case WSAECONNABORTED:
+            prError = PR_CONNECT_ABORTED_ERROR;
+            break;
+        case WSAECONNREFUSED:
+            prError = PR_CONNECT_REFUSED_ERROR;
+            break;
+        case WSAECONNRESET:
+            prError = PR_CONNECT_RESET_ERROR;
+            break;
+        case WSAEDESTADDRREQ:
+            prError = PR_INVALID_ARGUMENT_ERROR;
+            break;
+        case WSAEFAULT:
+            prError = PR_ACCESS_FAULT_ERROR;
+            break;
+        case WSAEHOSTUNREACH:
+            prError = PR_HOST_UNREACHABLE_ERROR;
+            break;
+        case WSAEINVAL:
+            prError = PR_INVALID_ARGUMENT_ERROR;
+            break;
+        case WSAEISCONN:
+            prError = PR_IS_CONNECTED_ERROR;
+            break;
+        case WSAEMFILE:
+            prError = PR_PROC_DESC_TABLE_FULL_ERROR;
+            break;
+        case WSAEMSGSIZE:
+            prError = PR_BUFFER_OVERFLOW_ERROR;
+            break;
+        case WSAENETDOWN:
+            prError = PR_NETWORK_DOWN_ERROR;
+            break;
+        case WSAENETRESET:
+            prError = PR_CONNECT_ABORTED_ERROR;
+            break;
+        case WSAENETUNREACH:
+            prError = PR_NETWORK_UNREACHABLE_ERROR;
+            break;
+        case WSAENOBUFS:
+            prError = PR_INSUFFICIENT_RESOURCES_ERROR;
+            break;
+        case WSAENOPROTOOPT:
+            prError = PR_INVALID_ARGUMENT_ERROR;
+            break;
+        case WSAENOTCONN:
+            prError = PR_NOT_CONNECTED_ERROR;
+            break;
+        case WSAENOTSOCK:
+            prError = PR_NOT_SOCKET_ERROR;
+            break;
+        case WSAEOPNOTSUPP:
+            prError = PR_OPERATION_NOT_SUPPORTED_ERROR;
+            break;
+        case WSAEPROTONOSUPPORT:
+            prError = PR_PROTOCOL_NOT_SUPPORTED_ERROR;
+            break;
+        case WSAEPROTOTYPE:
+            prError = PR_INVALID_ARGUMENT_ERROR;
+            break;
+        case WSAESHUTDOWN:
+            prError = PR_SOCKET_SHUTDOWN_ERROR;
+            break;
+        case WSAESOCKTNOSUPPORT:
+            prError = PR_INVALID_ARGUMENT_ERROR;
+            break;
+        case WSAETIMEDOUT:
+            prError = PR_CONNECT_ABORTED_ERROR;
+            break;
+        case WSAEWOULDBLOCK:
+            prError = PR_WOULD_BLOCK_ERROR;
+            break;
+        default:
+            prError = PR_UNKNOWN_ERROR;
+            break;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_win32_map_opendir_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_closedir_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_unix_readdir_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_delete_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+/* The error code for stat() is in errno. */
+void _MD_win32_map_stat_error(PRInt32 err)
+{
+    _MD_win32_map_default_errno(err);
+}
+
+void _MD_win32_map_fstat_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_rename_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+/* The error code for access() is in errno. */
+void _MD_win32_map_access_error(PRInt32 err)
+{
+    _MD_win32_map_default_errno(err);
+}
+
+void _MD_win32_map_mkdir_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_rmdir_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_read_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_transmitfile_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_write_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_lseek_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_fsync_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+/*
+ * For both CloseHandle() and closesocket().
+ */
+void _MD_win32_map_close_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_socket_error(PRInt32 err)
+{
+    PR_ASSERT(err != WSANOTINITIALISED);
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_recv_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_recvfrom_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_send_error(PRInt32 err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case WSAEMSGSIZE:
+            prError = PR_INVALID_ARGUMENT_ERROR;
+            break;
+        default:
+            _MD_win32_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_win32_map_sendto_error(PRInt32 err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case WSAEMSGSIZE:
+            prError = PR_INVALID_ARGUMENT_ERROR;
+            break;
+        default:
+            _MD_win32_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_win32_map_accept_error(PRInt32 err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case WSAEOPNOTSUPP:
+            prError = PR_NOT_TCP_SOCKET_ERROR;
+            break;
+        case WSAEINVAL:
+            prError = PR_INVALID_STATE_ERROR;
+            break;
+        default:
+            _MD_win32_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_win32_map_acceptex_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_connect_error(PRInt32 err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case WSAEWOULDBLOCK:
+            prError = PR_IN_PROGRESS_ERROR;
+            break;
+        case WSAEINVAL:
+            prError = PR_ALREADY_INITIATED_ERROR;
+            break;
+        case WSAETIMEDOUT:
+            prError = PR_IO_TIMEOUT_ERROR;
+            break;
+        default:
+            _MD_win32_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_win32_map_bind_error(PRInt32 err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case WSAEINVAL:
+            prError = PR_SOCKET_ADDRESS_IS_BOUND_ERROR;
+            break;
+        default:
+            _MD_win32_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_win32_map_listen_error(PRInt32 err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case WSAEOPNOTSUPP:
+            prError = PR_NOT_TCP_SOCKET_ERROR;
+            break;
+        case WSAEINVAL:
+            prError = PR_INVALID_STATE_ERROR;
+            break;
+        default:
+            _MD_win32_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_win32_map_shutdown_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_getsockname_error(PRInt32 err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case WSAEINVAL:
+            prError = PR_INVALID_STATE_ERROR;
+            break;
+        default:
+            _MD_win32_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_win32_map_getpeername_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_getsockopt_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_setsockopt_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_open_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+void _MD_win32_map_gethostname_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}
+
+/* Win32 select() only works on sockets.  So in this
+** context, WSAENOTSOCK is equivalent to EBADF on Unix.  
+*/
+void _MD_win32_map_select_error(PRInt32 err)
+{
+    PRErrorCode prError;
+
+    switch (err) {
+        case WSAENOTSOCK:
+            prError = PR_BAD_DESCRIPTOR_ERROR;
+            break;
+        default:
+            _MD_win32_map_default_error(err);
+            return;
+    }
+    PR_SetError(prError, err);
+}
+
+void _MD_win32_map_lockf_error(PRInt32 err)
+{
+    _MD_win32_map_default_error(err);
+}