Add m-esr52 at 52.6.0

46 files changed, 13591 insertions, 0 deletions

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 */
+