Revert "Update NSPR to 4.18"

This reverts commit 8781f745556be5d7402d0f3adc67ecfe32fe04a0.

32 files changed, 395 insertions, 295 deletions

diff --git a/nsprpub/TAG-INFO b/nsprpub/TAG-INFO
new file mode 100644
index 000000000..ebe7269ae
--- /dev/null
+++ b/nsprpub/TAG-INFO
@@ -0,0 +1 @@
+NSPR_4_16_RTM
diff --git a/nsprpub/configure b/nsprpub/configure
index 19e9fa60f..b8ad2b4eb 100755
--- a/nsprpub/configure
+++ b/nsprpub/configure
@@ -2488,7 +2488,7 @@ test -n "$target_alias" &&
   program_prefix=${target_alias}-
 
 MOD_MAJOR_VERSION=4
-MOD_MINOR_VERSION=18
+MOD_MINOR_VERSION=16
 MOD_PATCH_VERSION=0
 NSPR_MODNAME=nspr20
 _HAVE_PTHREADS=
@@ -6560,13 +6560,11 @@ fi
 
     $as_echo "#define HAVE_POINTER_LOCALTIME_R 1" >>confdefs.h
 
-
     HOST_DARWIN_MAJOR=`echo "$build_os" | sed -E -e 's/^darwin([0-9]+).*$/\1/'`
-
     if test "$HOST_DARWIN_MAJOR" -ge 15 ; then
         $as_echo "#define HAS_CONNECTX 1" >>confdefs.h
-
     fi
+
     AS='$(CC) -x assembler-with-cpp'
     CFLAGS="$CFLAGS -Wall -fno-common"
     case "${target_cpu}" in
@@ -8474,12 +8472,19 @@ case "$target" in
 
     fi
     if test "$USE_PTHREADS"; then
-        cat >>confdefs.h <<_ACEOF
+        if echo "$OS_RELEASE" | egrep '^(B.10.10|B.10.20)' >/dev/null; then
+            $as_echo "#define _REENTRANT 1" >>confdefs.h
+
+            $as_echo "#define _PR_DCETHREADS 1" >>confdefs.h
+
+        else
+            cat >>confdefs.h <<_ACEOF
 #define _POSIX_C_SOURCE 199506L
 _ACEOF
 
-        $as_echo "#define _PR_HAVE_THREADSAFE_GETHOST 1" >>confdefs.h
+            $as_echo "#define _PR_HAVE_THREADSAFE_GETHOST 1" >>confdefs.h
 
+        fi
     fi
     if test "$USE_USER_PTHREADS"; then
         cat >>confdefs.h <<_ACEOF
diff --git a/nsprpub/configure.in b/nsprpub/configure.in
index 7b0b8b395..22b4e7224 100644
--- a/nsprpub/configure.in
+++ b/nsprpub/configure.in
@@ -15,7 +15,7 @@ dnl ========================================================
 dnl = Defaults
 dnl ========================================================
 MOD_MAJOR_VERSION=4
-MOD_MINOR_VERSION=18
+MOD_MINOR_VERSION=16
 MOD_PATCH_VERSION=0
 NSPR_MODNAME=nspr20
 _HAVE_PTHREADS=
@@ -2889,8 +2889,13 @@ case "$target" in
         AC_DEFINE(_PR_LOCAL_THREADS_ONLY)
     fi 
     if test "$USE_PTHREADS"; then
-        AC_DEFINE_UNQUOTED(_POSIX_C_SOURCE,199506L)
-        AC_DEFINE(_PR_HAVE_THREADSAFE_GETHOST)
+        if echo "$OS_RELEASE" | egrep '^(B.10.10|B.10.20)' >/dev/null; then
+            AC_DEFINE(_REENTRANT)
+            AC_DEFINE(_PR_DCETHREADS)
+        else
+            AC_DEFINE_UNQUOTED(_POSIX_C_SOURCE,199506L)
+            AC_DEFINE(_PR_HAVE_THREADSAFE_GETHOST)
+        fi
     fi
     if test "$USE_USER_PTHREADS"; then
         AC_DEFINE_UNQUOTED(_POSIX_C_SOURCE,199506L)
diff --git a/nsprpub/pr/include/md/_pth.h b/nsprpub/pr/include/md/_pth.h
index 5603223a0..eeeef0438 100644
--- a/nsprpub/pr/include/md/_pth.h
+++ b/nsprpub/pr/include/md/_pth.h
@@ -14,7 +14,29 @@
 #define _PR_MD_DISABLE_CLOCK_INTERRUPTS()
 #define _PR_MD_ENABLE_CLOCK_INTERRUPTS()
 
-#if defined(BSDI)
+/* In good standards fashion, the DCE threads (based on posix-4) are not
+ * quite the same as newer posix implementations.  These are mostly name
+ * changes and small differences, so macros usually do the trick
+ */
+#ifdef _PR_DCETHREADS
+#define _PT_PTHREAD_MUTEXATTR_INIT        pthread_mutexattr_create
+#define _PT_PTHREAD_MUTEXATTR_DESTROY     pthread_mutexattr_delete
+#define _PT_PTHREAD_MUTEX_INIT(m, a)      pthread_mutex_init(&(m), a)
+#define _PT_PTHREAD_MUTEX_IS_LOCKED(m)    (0 == pthread_mutex_trylock(&(m)))
+#define _PT_PTHREAD_CONDATTR_INIT         pthread_condattr_create
+#define _PT_PTHREAD_COND_INIT(m, a)       pthread_cond_init(&(m), a)
+#define _PT_PTHREAD_CONDATTR_DESTROY      pthread_condattr_delete
+
+/* Notes about differences between DCE threads and pthreads 10:
+ *   1. pthread_mutex_trylock returns 1 when it locks the mutex
+ *      0 when it does not.  The latest pthreads has a set of errno-like
+ *      return values.
+ *   2. return values from pthread_cond_timedwait are different.
+ *
+ *
+ *
+ */
+#elif defined(BSDI)
 /*
  * Mutex and condition attributes are not supported.  The attr
  * argument to pthread_mutex_init() and pthread_cond_init() must
@@ -84,7 +106,13 @@
  *   PR_EnterMonitor calls any of these functions, infinite
  *   recursion ensues.
  */
-#if defined(IRIX) || defined(OSF1) || defined(AIX) || defined(SOLARIS) \
+#if defined(_PR_DCETHREADS)
+#define _PT_PTHREAD_INVALIDATE_THR_HANDLE(t) \
+	memset(&(t), 0, sizeof(pthread_t))
+#define _PT_PTHREAD_THR_HANDLE_IS_INVALID(t) \
+	(!memcmp(&(t), &pt_zero_tid, sizeof(pthread_t)))
+#define _PT_PTHREAD_COPY_THR_HANDLE(st, dt)   (dt) = (st)
+#elif defined(IRIX) || defined(OSF1) || defined(AIX) || defined(SOLARIS) \
 	|| defined(LINUX) || defined(__GNU__) || defined(__GLIBC__) \
 	|| defined(HPUX) || defined(FREEBSD) \
 	|| defined(NETBSD) || defined(OPENBSD) || defined(BSDI) \
@@ -97,7 +125,17 @@
 #error "pthreads is not supported for this architecture"
 #endif
 
-#if defined(_PR_PTHREADS)
+#if defined(_PR_DCETHREADS)
+#define _PT_PTHREAD_ATTR_INIT            pthread_attr_create
+#define _PT_PTHREAD_ATTR_DESTROY         pthread_attr_delete
+#define _PT_PTHREAD_CREATE(t, a, f, r)   pthread_create(t, a, f, r) 
+#define _PT_PTHREAD_KEY_CREATE           pthread_keycreate
+#define _PT_PTHREAD_ATTR_SETSCHEDPOLICY  pthread_attr_setsched
+#define _PT_PTHREAD_ATTR_GETSTACKSIZE(a, s) \
+                                     (*(s) = pthread_attr_getstacksize(*(a)), 0)
+#define _PT_PTHREAD_GETSPECIFIC(k, r) \
+		pthread_getspecific((k), (pthread_addr_t *) &(r))
+#elif defined(_PR_PTHREADS)
 #define _PT_PTHREAD_ATTR_INIT            pthread_attr_init
 #define _PT_PTHREAD_ATTR_DESTROY         pthread_attr_destroy
 #define _PT_PTHREAD_CREATE(t, a, f, r)   pthread_create(t, &a, f, r) 
@@ -109,6 +147,22 @@
 #error "Cannot determine pthread strategy"
 #endif
 
+#if defined(_PR_DCETHREADS)
+#define _PT_PTHREAD_EXPLICIT_SCHED      _PT_PTHREAD_DEFAULT_SCHED
+#endif
+
+/*
+ * pthread_mutex_trylock returns different values in DCE threads and
+ * pthreads.
+ */
+#if defined(_PR_DCETHREADS)
+#define PT_TRYLOCK_SUCCESS 1
+#define PT_TRYLOCK_BUSY    0
+#else
+#define PT_TRYLOCK_SUCCESS 0
+#define PT_TRYLOCK_BUSY    EBUSY
+#endif
+
 /*
  * These platforms don't have sigtimedwait()
  */
@@ -136,9 +190,16 @@
 #define PT_PRIO_MIN            DEFAULT_PRIO
 #define PT_PRIO_MAX            DEFAULT_PRIO
 #elif defined(HPUX)
+
+#if defined(_PR_DCETHREADS)
+#define PT_PRIO_MIN            PRI_OTHER_MIN
+#define PT_PRIO_MAX            PRI_OTHER_MAX
+#else /* defined(_PR_DCETHREADS) */
 #include <sys/sched.h>
 #define PT_PRIO_MIN            sched_get_priority_min(SCHED_OTHER)
 #define PT_PRIO_MAX            sched_get_priority_max(SCHED_OTHER)
+#endif /* defined(_PR_DCETHREADS) */
+
 #elif defined(LINUX) || defined(__GNU__) || defined(__GLIBC__) \
 	|| defined(FREEBSD) || defined(SYMBIAN)
 #define PT_PRIO_MIN            sched_get_priority_min(SCHED_OTHER)
@@ -177,7 +238,9 @@
  * Needed for garbage collection -- Look at PR_Suspend/PR_Resume
  * implementation.
  */
-#if defined(OSF1)
+#if defined(_PR_DCETHREADS)
+#define _PT_PTHREAD_YIELD()            	pthread_yield()
+#elif defined(OSF1)
 /*
  * sched_yield can't be called from a signal handler.  Must use
  * the _np version.
diff --git a/nsprpub/pr/include/prinet.h b/nsprpub/pr/include/prinet.h
index fc9f73918..15d229fe4 100644
--- a/nsprpub/pr/include/prinet.h
+++ b/nsprpub/pr/include/prinet.h
@@ -54,7 +54,7 @@ struct sockaddr_dl;
 #endif /* XP_UNIX */
 #include <netdb.h>
 
-#if defined(BSDI) || defined(QNX)
+#if defined(FREEBSD) || defined(BSDI) || defined(QNX)
 #include <rpc/types.h> /* the only place that defines INADDR_LOOPBACK */
 #endif
 
diff --git a/nsprpub/pr/include/prinit.h b/nsprpub/pr/include/prinit.h
index c55788923..fd935ec30 100644
--- a/nsprpub/pr/include/prinit.h
+++ b/nsprpub/pr/include/prinit.h
@@ -31,9 +31,9 @@ PR_BEGIN_EXTERN_C
 ** The format of the version string is
 **     "<major version>.<minor version>[.<patch level>] [<Beta>]"
 */
-#define PR_VERSION  "4.18"
+#define PR_VERSION  "4.16"
 #define PR_VMAJOR   4
-#define PR_VMINOR   18
+#define PR_VMINOR   16
 #define PR_VPATCH   0
 #define PR_BETA     PR_FALSE
 
diff --git a/nsprpub/pr/include/private/primpl.h b/nsprpub/pr/include/private/primpl.h
index a817c206c..dc24a2572 100644
--- a/nsprpub/pr/include/private/primpl.h
+++ b/nsprpub/pr/include/private/primpl.h
@@ -6,6 +6,14 @@
 #ifndef primpl_h___
 #define primpl_h___
 
+/*
+ * HP-UX 10.10's pthread.h (DCE threads) includes dce/cma.h, which
+ * has:
+ *     #define sigaction _sigaction_sys
+ * This macro causes chaos if signal.h gets included before pthread.h.
+ * To be safe, we include pthread.h first.
+ */
+
 #if defined(_PR_PTHREADS)
 #include <pthread.h>
 #endif
@@ -1869,7 +1877,7 @@ extern PRFileDesc *_pr_stderr;
 ** and functions with macros that expand to the native thread
 ** types and functions on each platform.
 */
-#if defined(_PR_PTHREADS)
+#if defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
 #define _PR_ZONE_ALLOCATOR
 #endif
 
@@ -2157,18 +2165,6 @@ extern PRUint32 connectCount;
 
 #endif /* XP_BEOS */
 
-#if defined(_WIN64) && defined(WIN95)
-typedef struct _PRFileDescList {
-  PRFileDesc *fd;
-  struct _PRFileDescList *next;
-} PRFileDescList;
-
-extern PRLock *_fd_waiting_for_overlapped_done_lock;
-extern PRFileDescList *_fd_waiting_for_overlapped_done;
-extern void CheckOverlappedPendingSocketsAreDone();
-#endif
-
-
 PR_END_EXTERN_C
 
 #endif /* primpl_h___ */
diff --git a/nsprpub/pr/src/Makefile.in b/nsprpub/pr/src/Makefile.in
index 19c5a6987..48b6faed7 100644
--- a/nsprpub/pr/src/Makefile.in
+++ b/nsprpub/pr/src/Makefile.in
@@ -138,8 +138,12 @@ endif
 
 ifeq ($(OS_ARCH),HP-UX)
 ifeq ($(USE_PTHREADS), 1)
+ifeq (,$(filter-out B.10.10 B.10.20,$(OS_RELEASE)))
+OS_LIBS 	= -ldce
+else
 OS_LIBS 	= -lpthread -lrt
 endif
+endif
 ifeq ($(PTHREADS_USER), 1)
 OS_LIBS 	= -lpthread
 endif
diff --git a/nsprpub/pr/src/io/prio.c b/nsprpub/pr/src/io/prio.c
index 10ae5e098..bf9763a2c 100644
--- a/nsprpub/pr/src/io/prio.c
+++ b/nsprpub/pr/src/io/prio.c
@@ -137,82 +137,11 @@ PR_IMPLEMENT(void) PR_FreeFileDesc(PRFileDesc *fd)
     _PR_Putfd(fd);
 }
 
-#if defined(_WIN64) && defined(WIN95)
-
-PRFileDescList *_fd_waiting_for_overlapped_done = NULL;
-PRLock *_fd_waiting_for_overlapped_done_lock = NULL;
-
-void CheckOverlappedPendingSocketsAreDone()
-{
-  if (!_fd_waiting_for_overlapped_done_lock ||
-      !_fd_waiting_for_overlapped_done) {
-    return;
-  }
-
-  PR_Lock(_fd_waiting_for_overlapped_done_lock);
-
-  PRFileDescList *cur = _fd_waiting_for_overlapped_done;
-  PRFileDescList *previous = NULL;
-  while (cur) {
-    PR_ASSERT(cur->fd->secret->overlappedActive);
-    PRFileDesc *fd = cur->fd;
-    DWORD rvSent;
-    if (GetOverlappedResult((HANDLE)fd->secret->md.osfd, &fd->secret->ol, &rvSent, FALSE) == TRUE) {
-      fd->secret->overlappedActive = PR_FALSE;
-      PR_LOG(_pr_io_lm, PR_LOG_MIN,
-             ("CheckOverlappedPendingSocketsAreDone GetOverlappedResult succeeded\n"));
-    } else {
-      DWORD err = WSAGetLastError();
-      PR_LOG(_pr_io_lm, PR_LOG_MIN,
-             ("CheckOverlappedPendingSocketsAreDone GetOverlappedResult failed %d\n", err));
-      if (err != ERROR_IO_INCOMPLETE) {
-        fd->secret->overlappedActive = PR_FALSE;
-      }
-    }
-
-    if (!fd->secret->overlappedActive) {
-
-      _PR_MD_CLOSE_SOCKET(fd->secret->md.osfd);
-      fd->secret->state = _PR_FILEDESC_CLOSED;
-#ifdef _PR_HAVE_PEEK_BUFFER
-      if (fd->secret->peekBuffer) {
-        PR_ASSERT(fd->secret->peekBufSize > 0);
-        PR_DELETE(fd->secret->peekBuffer);
-        fd->secret->peekBufSize = 0;
-        fd->secret->peekBytes = 0;
-      }
-#endif
-
-      PR_FreeFileDesc(fd);
-
-      if (previous) {
-        previous->next = cur->next;
-      } else {
-        _fd_waiting_for_overlapped_done = cur->next;
-      }
-      PRFileDescList *del = cur;
-      cur = cur->next;
-      PR_Free(del);
-    } else {
-      previous = cur;
-      cur = cur->next;
-    }
-  }
-
-  PR_Unlock(_fd_waiting_for_overlapped_done_lock);
-}
-#endif
-
 /*
 ** Wait for some i/o to finish on one or more more poll descriptors.
 */
 PR_IMPLEMENT(PRInt32) PR_Poll(PRPollDesc *pds, PRIntn npds, PRIntervalTime timeout)
 {
-#if defined(_WIN64) && defined(WIN95)
-  // For each iteration check if TFO overlapped IOs are down.
-  CheckOverlappedPendingSocketsAreDone();
-#endif
-
 	return(_PR_MD_PR_POLL(pds, npds, timeout));
 }
 
diff --git a/nsprpub/pr/src/io/prsocket.c b/nsprpub/pr/src/io/prsocket.c
index 26f7a245d..a24b8e1bb 100644
--- a/nsprpub/pr/src/io/prsocket.c
+++ b/nsprpub/pr/src/io/prsocket.c
@@ -304,25 +304,7 @@ static PRStatus PR_CALLBACK SocketConnectContinue(
         if (err != 0) {
             _PR_MD_MAP_CONNECT_ERROR(err);
         } else {
-#if defined(_WIN64)
-            if (fd->secret->overlappedActive) {
-                PRInt32 rvSent;
-                if (GetOverlappedResult(osfd, &fd->secret->ol, &rvSent, FALSE) == FALSE) {
-                    err = WSAGetLastError();
-                    PR_LOG(_pr_io_lm, PR_LOG_MIN,
-                           ("SocketConnectContinue GetOverlappedResult failed %d\n", err));
-                    if (err != ERROR_IO_INCOMPLETE) {
-                        _PR_MD_MAP_CONNECT_ERROR(err);
-                        fd->secret->overlappedActive = PR_FALSE;
-                    }
-                }
-            }
-            if (err == 0) {
-                PR_SetError(PR_UNKNOWN_ERROR, 0);
-            }
-#else
             PR_SetError(PR_UNKNOWN_ERROR, 0);
-#endif
         }
         return PR_FAILURE;
     }
@@ -737,56 +719,6 @@ static PRStatus PR_CALLBACK SocketClose(PRFileDesc *fd)
 	}
 
 	if (fd->secret->state == _PR_FILEDESC_OPEN) {
-#if defined(_WIN64) && defined(WIN95)
-    /* TCP Fast Open on Windows must use ConnectEx, which uses overlapped
-     * input/output. Before closing such a socket we must cancelIO.
-     */
-    if (fd->secret->overlappedActive) {
-      PR_ASSERT(fd->secret->nonblocking);
-      if (CancelIo((HANDLE) fd->secret->md.osfd) == TRUE) {
-        PR_LOG(_pr_io_lm, PR_LOG_MIN,
-               ("SocketClose - CancelIo succeeded\n"));
-      } else {
-        DWORD err = WSAGetLastError();
-        PR_LOG(_pr_io_lm, PR_LOG_MIN,
-               ("SocketClose - CancelIo failed err=%x\n", err));
-      }
-
-      DWORD rvSent;
-      if (GetOverlappedResult((HANDLE)fd->secret->md.osfd, &fd->secret->ol, &rvSent, FALSE) == TRUE) {
-        fd->secret->overlappedActive = PR_FALSE;
-        PR_LOG(_pr_io_lm, PR_LOG_MIN,
-               ("SocketClose GetOverlappedResult succeeded\n"));
-      } else {
-        DWORD err = WSAGetLastError();
-        PR_LOG(_pr_io_lm, PR_LOG_MIN,
-               ("SocketClose GetOverlappedResult failed %d\n", err));
-        if (err != ERROR_IO_INCOMPLETE) {
-          _PR_MD_MAP_CONNECT_ERROR(err);
-          fd->secret->overlappedActive = PR_FALSE;
-        }
-      }
-    }
-
-    if (fd->secret->overlappedActive &&
-        _fd_waiting_for_overlapped_done_lock) {
-      // Put osfd into the list to be checked later.
-      PRFileDescList *forWaiting = PR_NEW(PRFileDescList);
-      if (!forWaiting) {
-        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
-        return PR_FAILURE;
-      }
-      forWaiting->fd = fd;
-
-      PR_Lock(_fd_waiting_for_overlapped_done_lock);
-      forWaiting->next = _fd_waiting_for_overlapped_done;
-      _fd_waiting_for_overlapped_done = forWaiting;
-      PR_Unlock(_fd_waiting_for_overlapped_done_lock);
-
-      return PR_SUCCESS;
-    }
-#endif
-
 		if (_PR_MD_CLOSE_SOCKET(fd->secret->md.osfd) < 0) {
 			return PR_FAILURE;
 		}
diff --git a/nsprpub/pr/src/md/unix/unix.c b/nsprpub/pr/src/md/unix/unix.c
index 29e24e574..662f561b6 100644
--- a/nsprpub/pr/src/md/unix/unix.c
+++ b/nsprpub/pr/src/md/unix/unix.c
@@ -2854,11 +2854,28 @@ void _PR_UnixInit(void)
 #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);
diff --git a/nsprpub/pr/src/md/unix/uxproces.c b/nsprpub/pr/src/md/unix/uxproces.c
index 18f23fde8..5286b9e18 100644
--- a/nsprpub/pr/src/md/unix/uxproces.c
+++ b/nsprpub/pr/src/md/unix/uxproces.c
@@ -685,6 +685,10 @@ static void pr_SigchldHandler(int sig)
 
 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;
 
diff --git a/nsprpub/pr/src/md/windows/ntthread.c b/nsprpub/pr/src/md/windows/ntthread.c
index 1fdf0e93b..fead1236d 100644
--- a/nsprpub/pr/src/md/windows/ntthread.c
+++ b/nsprpub/pr/src/md/windows/ntthread.c
@@ -27,9 +27,6 @@ PRUint32                        _nt_idleCount;
 extern __declspec(thread) PRThread *_pr_io_restarted_io;
 extern DWORD _pr_io_restartedIOIndex;
 
-typedef HRESULT (WINAPI *SETTHREADDESCRIPTION)(HANDLE, PCWSTR);
-static SETTHREADDESCRIPTION sSetThreadDescription = NULL;
-
 /* Must check the restarted_io *before* decrementing no_sched to 0 */
 #define POST_SWITCH_WORK() \
     PR_BEGIN_MACRO \
@@ -82,8 +79,6 @@ _nt_handle_restarted_io(PRThread *restarted_io)
 void
 _PR_MD_EARLY_INIT()
 {
-    HMODULE hModule;
-
     _MD_NEW_LOCK( &_nt_idleLock );
     _nt_idleCount = 0;
     PR_INIT_CLIST(&_nt_idleList);
@@ -103,15 +98,6 @@ _PR_MD_EARLY_INIT()
         _pr_intsOffIndex = TlsAlloc();
         _pr_io_restartedIOIndex = TlsAlloc();
     }
-
-    // SetThreadDescription is Windows 10 build 1607+
-    hModule = GetModuleHandleW(L"kernel32.dll");
-    if (hModule) {
-        sSetThreadDescription =
-            (SETTHREADDESCRIPTION) GetProcAddress(
-                                       hModule,
-                                       "SetThreadDescription");
-    }
 }
 
 void _PR_MD_CLEANUP_BEFORE_EXIT(void)
@@ -307,16 +293,7 @@ _PR_MD_SET_CURRENT_THREAD_NAME(const char *name)
 {
 #ifdef _MSC_VER
    THREADNAME_INFO info;
-#endif
-
-   if (sSetThreadDescription) {
-      WCHAR wideName[MAX_PATH];
-      if (MultiByteToWideChar(CP_ACP, 0, name, -1, wideName, MAX_PATH)) {
-         sSetThreadDescription(GetCurrentThread(), wideName);
-      }
-   }
 
-#ifdef _MSC_VER
    if (!IsDebuggerPresent())
       return;
 
diff --git a/nsprpub/pr/src/md/windows/w95sock.c b/nsprpub/pr/src/md/windows/w95sock.c
index c6a3ec111..0429c655a 100644
--- a/nsprpub/pr/src/md/windows/w95sock.c
+++ b/nsprpub/pr/src/md/windows/w95sock.c
@@ -382,11 +382,6 @@ PRInt32
 _PR_MD_TCPSENDTO(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
                  const PRNetAddr *addr, PRUint32 addrlen, PRIntervalTime timeout)
 {
-    if (!_fd_waiting_for_overlapped_done_lock) {
-        PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
-        return PR_FAILURE;
-    }
-
     if (PR_CallOnce(&_pr_has_connectex_once, _pr_set_connectex) != PR_SUCCESS) {
         PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
         return PR_FAILURE;
diff --git a/nsprpub/pr/src/md/windows/w95thred.c b/nsprpub/pr/src/md/windows/w95thred.c
index a365411f5..c27d982a7 100644
--- a/nsprpub/pr/src/md/windows/w95thred.c
+++ b/nsprpub/pr/src/md/windows/w95thred.c
@@ -1,4 +1,3 @@
-
 /* -*- 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
@@ -28,32 +27,14 @@ DWORD _pr_currentCPUIndex;
 int                           _pr_intsOff = 0; 
 _PRInterruptTable             _pr_interruptTable[] = { { 0 } };
 
-typedef HRESULT (WINAPI *SETTHREADDESCRIPTION)(HANDLE, PCWSTR);
-static SETTHREADDESCRIPTION sSetThreadDescription = NULL;
-
 void
 _PR_MD_EARLY_INIT()
 {
-    HMODULE hModule;
-
 #ifndef _PR_USE_STATIC_TLS
     _pr_currentThreadIndex = TlsAlloc();
     _pr_lastThreadIndex = TlsAlloc();
     _pr_currentCPUIndex = TlsAlloc();
 #endif
-
-#if defined(_WIN64) && defined(WIN95)
-    _fd_waiting_for_overlapped_done_lock = PR_NewLock();
-#endif
-
-    // SetThreadDescription is Windows 10 build 1607+
-    hModule = GetModuleHandleW(L"kernel32.dll");
-    if (hModule) {
-        sSetThreadDescription =
-            (SETTHREADDESCRIPTION) GetProcAddress(
-                                       hModule,
-                                       "SetThreadDescription");
-    }
 }
 
 void _PR_MD_CLEANUP_BEFORE_EXIT(void)
@@ -69,29 +50,6 @@ void _PR_MD_CLEANUP_BEFORE_EXIT(void)
     TlsFree(_pr_lastThreadIndex);
     TlsFree(_pr_currentCPUIndex);
 #endif
-
-#if defined(_WIN64) && defined(WIN95)
-    // For each iteration check if TFO overlapped IOs are down.
-    if (_fd_waiting_for_overlapped_done_lock) {
-        PRIntervalTime delay = PR_MillisecondsToInterval(1000);
-        PRFileDescList *cur;
-        do {
-            CheckOverlappedPendingSocketsAreDone();
-
-            PR_Lock(_fd_waiting_for_overlapped_done_lock);
-            cur = _fd_waiting_for_overlapped_done;
-            PR_Unlock(_fd_waiting_for_overlapped_done_lock);
-#if defined(DO_NOT_WAIT_FOR_CONNECT_OVERLAPPED_OPERATIONS)
-            cur = NULL;
-#endif
-            if (cur) {
-                PR_Sleep(delay); // wait another 1s.
-            }
-        } while (cur);
-
-        PR_DestroyLock(_fd_waiting_for_overlapped_done_lock);
-    }
-#endif
 }
 
 PRStatus
@@ -232,16 +190,7 @@ _PR_MD_SET_CURRENT_THREAD_NAME(const char *name)
 {
 #ifdef _MSC_VER
    THREADNAME_INFO info;
-#endif
-
-   if (sSetThreadDescription) {
-      WCHAR wideName[MAX_PATH];
-      if (MultiByteToWideChar(CP_ACP, 0, name, -1, wideName, MAX_PATH)) {
-         sSetThreadDescription(GetCurrentThread(), wideName);
-      }
-   }
 
-#ifdef _MSC_VER
    if (!IsDebuggerPresent())
       return;
 
diff --git a/nsprpub/pr/src/md/windows/win32_errors.c b/nsprpub/pr/src/md/windows/win32_errors.c
index 275792187..d26820a7a 100644
--- a/nsprpub/pr/src/md/windows/win32_errors.c
+++ b/nsprpub/pr/src/md/windows/win32_errors.c
@@ -166,26 +166,21 @@ void _MD_win32_map_default_error(PRInt32 err)
             prError = PR_ADDRESS_IN_USE_ERROR;
             break;
         case WSAEADDRNOTAVAIL:
-        case ERROR_INVALID_NETNAME:
             prError = PR_ADDRESS_NOT_AVAILABLE_ERROR;
             break;
         case WSAEAFNOSUPPORT:
-        case ERROR_INCORRECT_ADDRESS:
             prError = PR_ADDRESS_NOT_SUPPORTED_ERROR;
             break;
         case WSAEALREADY:
-        case ERROR_ALREADY_INITIALIZED:
             prError = PR_ALREADY_INITIATED_ERROR;
             break;
         case WSAEBADF:
             prError = PR_BAD_DESCRIPTOR_ERROR;
             break;
         case WSAECONNABORTED:
-        case ERROR_CONNECTION_ABORTED:
             prError = PR_CONNECT_ABORTED_ERROR;
             break;
         case WSAECONNREFUSED:
-        case ERROR_CONNECTION_REFUSED:
             prError = PR_CONNECT_REFUSED_ERROR;
             break;
         case WSAECONNRESET:
@@ -198,7 +193,6 @@ void _MD_win32_map_default_error(PRInt32 err)
             prError = PR_ACCESS_FAULT_ERROR;
             break;
         case WSAEHOSTUNREACH:
-        case ERROR_HOST_UNREACHABLE:
             prError = PR_HOST_UNREACHABLE_ERROR;
             break;
         case WSAEINVAL:
@@ -214,14 +208,12 @@ void _MD_win32_map_default_error(PRInt32 err)
             prError = PR_BUFFER_OVERFLOW_ERROR;
             break;
         case WSAENETDOWN:
-        case ERROR_NO_NETWORK:
             prError = PR_NETWORK_DOWN_ERROR;
             break;
         case WSAENETRESET:
             prError = PR_CONNECT_ABORTED_ERROR;
             break;
         case WSAENETUNREACH:
-        case ERROR_NETWORK_UNREACHABLE:
             prError = PR_NETWORK_UNREACHABLE_ERROR;
             break;
         case WSAENOBUFS:
diff --git a/nsprpub/pr/src/misc/pratom.c b/nsprpub/pr/src/misc/pratom.c
index 65e6f3cd8..95bbee1d5 100644
--- a/nsprpub/pr/src/misc/pratom.c
+++ b/nsprpub/pr/src/misc/pratom.c
@@ -23,7 +23,7 @@
 
 #if !defined(_PR_HAVE_ATOMIC_OPS)
 
-#if defined(_PR_PTHREADS)
+#if defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
 /*
  * PR_AtomicDecrement() is used in NSPR's thread-specific data
  * destructor.  Because thread-specific data destructors may be
@@ -190,7 +190,7 @@ _PR_MD_ATOMIC_SET(PRInt32 *val, PRInt32 newval)
     pthread_mutex_unlock(&atomic_locks[idx]);
     return rv;
 }
-#else  /* _PR_PTHREADS */
+#else  /* _PR_PTHREADS && !_PR_DCETHREADS */
 /*
  * We use a single lock for all the emulated atomic operations.
  * The lock contention should be acceptable.
@@ -259,7 +259,7 @@ _PR_MD_ATOMIC_SET(PRInt32 *val, PRInt32 newval)
     PR_Unlock(atomic_lock);
     return rv;
 }
-#endif  /* _PR_PTHREADS */
+#endif  /* _PR_PTHREADS && !_PR_DCETHREADS */
 
 #endif  /* !_PR_HAVE_ATOMIC_OPS */
 
diff --git a/nsprpub/pr/src/pthreads/ptio.c b/nsprpub/pr/src/pthreads/ptio.c
index f6aa56741..9dde03191 100644
--- a/nsprpub/pr/src/pthreads/ptio.c
+++ b/nsprpub/pr/src/pthreads/ptio.c
@@ -1895,6 +1895,19 @@ static PRInt32 pt_Send(
 	PRInt32 tmp_amount = amount;
 #endif
 
+    /*
+     * Under HP-UX DCE threads, pthread.h includes dce/cma_ux.h,
+     * which has the following:
+     *     #  define send        cma_send
+     *     extern int  cma_send (int , void *, int, int );
+     * So we need to cast away the 'const' of argument #2 for send().
+     */
+#if defined (HPUX) && defined(_PR_DCETHREADS)
+#define PT_SENDBUF_CAST (void *)
+#else
+#define PT_SENDBUF_CAST
+#endif
+
     if (pt_TestAbort()) return bytes;
 
     /*
@@ -1905,9 +1918,9 @@ static PRInt32 pt_Send(
 #if defined(SOLARIS)
     PR_ASSERT(0 == flags);
 retry:
-    bytes = write(fd->secret->md.osfd, buf, tmp_amount);
+    bytes = write(fd->secret->md.osfd, PT_SENDBUF_CAST buf, tmp_amount);
 #else
-    bytes = send(fd->secret->md.osfd, buf, amount, flags);
+    bytes = send(fd->secret->md.osfd, PT_SENDBUF_CAST buf, amount, flags);
 #endif
     syserrno = errno;
 
diff --git a/nsprpub/pr/src/pthreads/ptsynch.c b/nsprpub/pr/src/pthreads/ptsynch.c
index a93b74795..251205336 100644
--- a/nsprpub/pr/src/pthreads/ptsynch.c
+++ b/nsprpub/pr/src/pthreads/ptsynch.c
@@ -23,6 +23,11 @@ static pthread_condattr_t _pt_cvar_attr;
 
 #if defined(DEBUG)
 extern PTDebug pt_debug;  /* this is shared between several modules */
+
+#if defined(_PR_DCETHREADS)
+static pthread_t pt_zero_tid;  /* a null pthread_t (pthread_t is a struct
+                                * in DCE threads) to compare with */
+#endif  /* defined(_PR_DCETHREADS) */
 #endif  /* defined(DEBUG) */
 
 #if defined(FREEBSD)
@@ -258,7 +263,12 @@ static PRIntn pt_TimedWait(
     rv = pthread_cond_timedwait(cv, ml, &tmo);
 
     /* NSPR doesn't report timeouts */
+#ifdef _PR_DCETHREADS
+    if (rv == -1) return (errno == EAGAIN) ? 0 : errno;
+    else return rv;
+#else
     return (rv == ETIMEDOUT) ? 0 : rv;
+#endif
 }  /* pt_TimedWait */
 
 
@@ -1161,14 +1171,14 @@ PR_IMPLEMENT(PRStatus) PR_DeleteSemaphore(const char *name)
 PR_IMPLEMENT(PRStatus) PRP_TryLock(PRLock *lock)
 {
     PRIntn rv = pthread_mutex_trylock(&lock->mutex);
-    if (rv == 0)
+    if (rv == PT_TRYLOCK_SUCCESS)
     {
         PR_ASSERT(PR_FALSE == lock->locked);
         lock->locked = PR_TRUE;
         lock->owner = pthread_self();
     }
     /* XXX set error code? */
-    return (0 == rv) ? PR_SUCCESS : PR_FAILURE;
+    return (PT_TRYLOCK_SUCCESS == rv) ? PR_SUCCESS : PR_FAILURE;
 }  /* PRP_TryLock */
 
 PR_IMPLEMENT(PRCondVar*) PRP_NewNakedCondVar(void)
diff --git a/nsprpub/pr/src/pthreads/ptthread.c b/nsprpub/pr/src/pthreads/ptthread.c
index 6046d5d8d..9e12606ea 100644
--- a/nsprpub/pr/src/pthreads/ptthread.c
+++ b/nsprpub/pr/src/pthreads/ptthread.c
@@ -9,7 +9,7 @@
 ** Exports:            ptthread.h
 */
 
-#if defined(_PR_PTHREADS)
+#if defined(_PR_PTHREADS) || defined(_PR_DCETHREADS)
 
 #include "prlog.h"
 #include "primpl.h"
@@ -58,7 +58,7 @@ static struct _PT_Bookeeping
     pthread_key_t key;          /* thread private data key */
     PRBool keyCreated;          /* whether 'key' should be deleted */
     PRThread *first, *last;     /* list of threads we know about */
-#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+#if defined(_PR_DCETHREADS) || _POSIX_THREAD_PRIORITY_SCHEDULING > 0
     PRInt32 minPrio, maxPrio;   /* range of scheduling priorities */
 #endif
 } pt_book = {0};
@@ -67,7 +67,7 @@ static void _pt_thread_death(void *arg);
 static void _pt_thread_death_internal(void *arg, PRBool callDestructors);
 static void init_pthread_gc_support(void);
 
-#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+#if defined(_PR_DCETHREADS) || _POSIX_THREAD_PRIORITY_SCHEDULING > 0
 static PRIntn pt_PriorityMap(PRThreadPriority pri)
 {
 #ifdef NTO
@@ -148,6 +148,21 @@ static void *_pt_root(void *arg)
     }
 #endif
 
+    /*
+    ** DCE Threads can't detach during creation, so do it late.
+    ** I would like to do it only here, but that doesn't seem
+    ** to work.
+    */
+#if defined(_PR_DCETHREADS)
+    if (detached)
+    {
+        /* pthread_detach() modifies its argument, so we must pass a copy */
+        pthread_t self = id;
+        rv = pthread_detach(&self);
+        PR_ASSERT(0 == rv);
+    }
+#endif /* defined(_PR_DCETHREADS) */
+
     /* Set up the thread stack information */
     _PR_InitializeStack(thred->stack);
 
@@ -314,7 +329,7 @@ static PRThread* _PR_CreateThread(
 
     if (EPERM != pt_schedpriv)
     {
-#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+#if !defined(_PR_DCETHREADS) && _POSIX_THREAD_PRIORITY_SCHEDULING > 0
         struct sched_param schedule;
 #endif
 
@@ -325,7 +340,10 @@ static PRThread* _PR_CreateThread(
 
         /* Use the default scheduling policy */
 
-#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+#if defined(_PR_DCETHREADS)
+        rv = pthread_attr_setprio(&tattr, pt_PriorityMap(priority));
+        PR_ASSERT(0 == rv);
+#elif _POSIX_THREAD_PRIORITY_SCHEDULING > 0
         rv = pthread_attr_getschedparam(&tattr, &schedule);
         PR_ASSERT(0 == rv);
         schedule.sched_priority = pt_PriorityMap(priority);
@@ -335,13 +353,19 @@ static PRThread* _PR_CreateThread(
         rv = pthread_attr_setschedpolicy(&tattr, SCHED_RR); /* Round Robin */
         PR_ASSERT(0 == rv);
 #endif
-#endif /* _POSIX_THREAD_PRIORITY_SCHEDULING > 0 */
+#endif /* !defined(_PR_DCETHREADS) */
     }
 
+    /*
+     * DCE threads can't set detach state before creating the thread.
+     * AIX can't set detach late. Why can't we all just get along?
+     */
+#if !defined(_PR_DCETHREADS)
     rv = pthread_attr_setdetachstate(&tattr,
         ((PR_JOINABLE_THREAD == state) ?
             PTHREAD_CREATE_JOINABLE : PTHREAD_CREATE_DETACHED));
     PR_ASSERT(0 == rv);
+#endif /* !defined(_PR_DCETHREADS) */
 
     /*
      * If stackSize is 0, we use the default pthread stack size.
@@ -432,6 +456,7 @@ static PRThread* _PR_CreateThread(
          */
         rv = _PT_PTHREAD_CREATE(&id, tattr, _pt_root, thred);
 
+#if !defined(_PR_DCETHREADS)
         if (EPERM == rv)
         {
 #if defined(IRIX)
@@ -457,10 +482,15 @@ static PRThread* _PR_CreateThread(
 #endif	/* IRIX */
             rv = _PT_PTHREAD_CREATE(&id, tattr, _pt_root, thred);
         }
+#endif
 
         if (0 != rv)
         {
+#if defined(_PR_DCETHREADS)
+            PRIntn oserr = errno;
+#else
             PRIntn oserr = rv;
+#endif
             PR_Lock(pt_book.ml);
             if (thred->state & PT_THREAD_SYSTEM)
                 pt_book.system -= 1;
@@ -572,6 +602,10 @@ PR_IMPLEMENT(PRStatus) PR_JoinThread(PRThread *thred)
         PR_ASSERT(rv == 0 && result == NULL);
         if (0 == rv)
         {
+#ifdef _PR_DCETHREADS
+            rv = pthread_detach(&id);
+            PR_ASSERT(0 == rv);
+#endif
             /*
              * PR_FALSE, because the thread already called the TPD
              * destructors before exiting _pt_root.
@@ -659,7 +693,10 @@ PR_IMPLEMENT(void) PR_SetThreadPriority(PRThread *thred, PRThreadPriority newPri
     else if ((PRIntn)PR_PRIORITY_LAST < (PRIntn)newPri)
         newPri = PR_PRIORITY_LAST;
 
-#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+#if defined(_PR_DCETHREADS)
+    rv = pthread_setprio(thred->id, pt_PriorityMap(newPri));
+    /* pthread_setprio returns the old priority */
+#elif _POSIX_THREAD_PRIORITY_SCHEDULING > 0
     if (EPERM != pt_schedpriv)
     {
         int policy;
@@ -890,7 +927,7 @@ void _PR_InitThreads(
     pthread_init();
 #endif
 
-#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+#if defined(_PR_DCETHREADS) || _POSIX_THREAD_PRIORITY_SCHEDULING > 0
 #if defined(FREEBSD)
     {
     pthread_attr_t attr;
@@ -1124,7 +1161,11 @@ PR_IMPLEMENT(void) PR_ProcessExit(PRIntn status)
 
 PR_IMPLEMENT(PRUint32) PR_GetThreadID(PRThread *thred)
 {
+#if defined(_PR_DCETHREADS)
+    return (PRUint32)&thred->id;  /* this is really a sham! */
+#else
     return (PRUint32)thred->id;  /* and I don't know what they will do with it */
+#endif
 }
 
 /*
@@ -1156,6 +1197,18 @@ PR_SetThreadDumpProc(PRThread* thread, PRThreadDumpProc dump, void *arg)
  * Garbage collection support follows.
  */
 
+#if defined(_PR_DCETHREADS)
+
+/*
+ * statics for Garbage Collection support.  We don't need to protect these
+ * signal masks since the garbage collector itself is protected by a lock
+ * and multiple threads will not be garbage collecting at the same time.
+ */
+static sigset_t javagc_vtalarm_sigmask;
+static sigset_t javagc_intsoff_sigmask;
+
+#else /* defined(_PR_DCETHREADS) */
+
 /* a bogus signal mask for forcing a timed wait */
 /* Not so bogus in AIX as we really do a sigwait */
 static sigset_t sigwait_set;
@@ -1171,6 +1224,8 @@ static void suspend_signal_handler(PRIntn sig);
 static void null_signal_handler(PRIntn sig);
 #endif
 
+#endif /* defined(_PR_DCETHREADS) */
+
 /*
  * Linux pthreads use SIGUSR1 and SIGUSR2 internally, which
  * conflict with the use of these two signals in our GC support.
@@ -1181,6 +1236,12 @@ static void init_pthread_gc_support(void)
 #ifndef SYMBIAN
     PRIntn rv;
 
+#if defined(_PR_DCETHREADS)
+	rv = sigemptyset(&javagc_vtalarm_sigmask);
+    PR_ASSERT(0 == rv);
+	rv = sigaddset(&javagc_vtalarm_sigmask, SIGVTALRM);
+    PR_ASSERT(0 == rv);
+#else  /* defined(_PR_DCETHREADS) */
 	{
 	    struct sigaction sigact_usr2;
 
@@ -1208,6 +1269,7 @@ static void init_pthread_gc_support(void)
 	    PR_ASSERT(0 ==rv); 
     }
 #endif  /* defined(PT_NO_SIGTIMEDWAIT) */
+#endif /* defined(_PR_DCETHREADS) */
 #endif /* SYMBIAN */
 }
 
@@ -1238,8 +1300,10 @@ PR_IMPLEMENT(PRStatus) PR_EnumerateThreads(PREnumerator func, void *arg)
     PRThread* thred = pt_book.first;
 
 #if defined(DEBUG) || defined(FORCE_PR_ASSERT)
+#if !defined(_PR_DCETHREADS)
     PRThread *me = PR_GetCurrentThread();
 #endif
+#endif
 
     PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_EnumerateThreads\n"));
     /*
@@ -1267,7 +1331,9 @@ PR_IMPLEMENT(PRStatus) PR_EnumerateThreads(PREnumerator func, void *arg)
 
         if (_PT_IS_GCABLE_THREAD(thred))
         {
+#if !defined(_PR_DCETHREADS)
             PR_ASSERT((thred == me) || (thred->suspend & PT_THREAD_SUSPENDED));
+#endif
             PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, 
                    ("In PR_EnumerateThreads callback thread %p thid = %X\n", 
                     thred, thred->id));
@@ -1295,6 +1361,8 @@ PR_IMPLEMENT(PRStatus) PR_EnumerateThreads(PREnumerator func, void *arg)
  * proceed until the thread is suspended or resumed.
  */
 
+#if !defined(_PR_DCETHREADS)
+
 /*
  * In the signal handler, we can not use condition variable notify or wait.
  * This does not work consistently across all pthread platforms.  We also can not 
@@ -1593,6 +1661,78 @@ PR_IMPLEMENT(void *)PR_GetSP(PRThread *thred)
     return thred->sp;
 }  /* PR_GetSP */
 
+#else /* !defined(_PR_DCETHREADS) */
+
+static pthread_once_t pt_gc_support_control = pthread_once_init;
+
+/*
+ * For DCE threads, there is no pthread_kill or a way of suspending or resuming a
+ * particular thread.  We will just disable the preemption (virtual timer alarm) and
+ * let the executing thread finish the garbage collection.  This stops all other threads
+ * (GC able or not) and is very inefficient but there is no other choice.
+ */
+PR_IMPLEMENT(void) PR_SuspendAll()
+{
+    PRIntn rv;
+
+    rv = pthread_once(&pt_gc_support_control, init_pthread_gc_support);
+    PR_ASSERT(0 == rv);  /* returns -1 on failure */
+#ifdef DEBUG
+    suspendAllOn = PR_TRUE;
+#endif
+    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_SuspendAll\n"));
+    /* 
+     * turn off preemption - i.e add virtual alarm signal to the set of 
+     * blocking signals 
+     */
+    rv = sigprocmask(
+        SIG_BLOCK, &javagc_vtalarm_sigmask, &javagc_intsoff_sigmask);
+    PR_ASSERT(0 == rv);
+    suspendAllSuspended = PR_TRUE;
+    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("End PR_SuspendAll\n"));
+}  /* PR_SuspendAll */
+
+PR_IMPLEMENT(void) PR_ResumeAll()
+{
+    PRIntn rv;
+    
+    suspendAllSuspended = PR_FALSE;
+    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_ResumeAll\n"));
+    /* turn on preemption - i.e re-enable virtual alarm signal */
+
+    rv = sigprocmask(SIG_SETMASK, &javagc_intsoff_sigmask, (sigset_t *)NULL);
+    PR_ASSERT(0 == rv);
+#ifdef DEBUG
+    suspendAllOn = PR_FALSE;
+#endif
+
+    PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("End PR_ResumeAll\n"));
+}  /* PR_ResumeAll */
+
+/* Return the stack pointer for the given thread- used by the GC */
+PR_IMPLEMENT(void*)PR_GetSP(PRThread *thred)
+{
+	pthread_t tid = thred->id;
+	char *thread_tcb, *top_sp;
+
+	/*
+	 * For HPUX DCE threads, pthread_t is a struct with the
+	 * following three fields (see pthread.h, dce/cma.h):
+	 *     cma_t_address       field1;
+	 *     short int           field2;
+	 *     short int           field3;
+	 * where cma_t_address is typedef'd to be either void*
+	 * or char*.
+	 */
+	PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_GetSP\n"));
+	thread_tcb = (char*)tid.field1;
+	top_sp = *(char**)(thread_tcb + 128);
+	PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("End PR_GetSP %p \n", top_sp));
+	return top_sp;
+}  /* PR_GetSP */
+
+#endif /* !defined(_PR_DCETHREADS) */
+
 PR_IMPLEMENT(PRStatus) PR_SetCurrentThreadName(const char *name)
 {
     PRThread *thread;
@@ -1677,6 +1817,6 @@ PR_IMPLEMENT(const char *) PR_GetThreadName(const PRThread *thread)
     return thread->name;
 }
 
-#endif  /* defined(_PR_PTHREADS) */
+#endif  /* defined(_PR_PTHREADS) || defined(_PR_DCETHREADS) */
 
 /* ptthread.c */
diff --git a/nsprpub/pr/src/threads/prrwlock.c b/nsprpub/pr/src/threads/prrwlock.c
index 1dd9e0a90..2e0f9ea4e 100644
--- a/nsprpub/pr/src/threads/prrwlock.c
+++ b/nsprpub/pr/src/threads/prrwlock.c
@@ -7,7 +7,7 @@
 
 #include <string.h>
 
-#if defined(HPUX) && defined(_PR_PTHREADS)
+#if defined(HPUX) && defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
 
 #include <pthread.h>
 #define HAVE_UNIX98_RWLOCK
diff --git a/nsprpub/pr/tests/Makefile.in b/nsprpub/pr/tests/Makefile.in
index 79a67f09c..df1f1f2dd 100644
--- a/nsprpub/pr/tests/Makefile.in
+++ b/nsprpub/pr/tests/Makefile.in
@@ -373,6 +373,9 @@ endif
 ifeq (,$(filter-out FreeBSD OpenBSD BSD_OS QNX Darwin OpenUNIX,$(OS_ARCH)))
 LIBPTHREAD =
 endif
+ifeq ($(OS_ARCH)$(basename $(OS_RELEASE)),HP-UXB.10)
+LIBPTHREAD = -ldce
+endif
 endif
 
 ifeq ($(OS_TARGET),Android)
diff --git a/nsprpub/pr/tests/attach.c b/nsprpub/pr/tests/attach.c
index a1493b8ec..a5daf9d96 100644
--- a/nsprpub/pr/tests/attach.c
+++ b/nsprpub/pr/tests/attach.c
@@ -111,6 +111,16 @@ static int32 threadStartFunc(void *arg)
 static void * threadStartFunc(void *arg)
 #endif
 {
+#ifdef _PR_DCETHREADS
+    {
+        int rv;
+        pthread_t self = pthread_self();
+        rv = pthread_detach(&self);
+        if (debug_mode) PR_ASSERT(0 == rv);
+		else if (0 != rv) failed_already=1;
+    }
+#endif
+
     Measure(AttachDetach, "Attach/Detach");
 
 #ifndef IRIX
@@ -196,12 +206,14 @@ int main(int argc, char **argv)
 		goto exit_now;
 	}
 	
+#ifndef _PR_DCETHREADS
     rv = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
     if (debug_mode) PR_ASSERT(0 == rv);
 	else if (0 != rv) {
 		failed_already=1;
 		goto exit_now;
 	}
+#endif  /* !_PR_DCETHREADS */
     rv = _PT_PTHREAD_CREATE(&threadID, attr, threadStartFunc, NULL);
     if (rv != 0) {
 			fprintf(stderr, "thread creation failed: error code %d\n", rv);
diff --git a/nsprpub/pr/tests/dceemu.c b/nsprpub/pr/tests/dceemu.c
index 99fd6cb7c..b06b49e3a 100644
--- a/nsprpub/pr/tests/dceemu.c
+++ b/nsprpub/pr/tests/dceemu.c
@@ -29,6 +29,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#if defined(_PR_DCETHREADS)
+
 PRIntn failed_already=0;
 PRIntn debug_mode=0;
 
@@ -78,13 +80,20 @@ static PRIntn prmain(PRIntn argc, char **argv)
 
 }  /* prmain */
 
+#endif /* #if defined(_PR_DCETHREADS) */
+
 int main(int argc, char **argv)
 {
+
+#if defined(_PR_DCETHREADS)
     PR_Initialize(prmain, argc, argv, 0);
     if(failed_already)    
         return 1;
     else
         return 0;
+#else
+    return 0;
+#endif
 }  /* main */
 
 
diff --git a/nsprpub/pr/tests/foreign.c b/nsprpub/pr/tests/foreign.c
index cfb2e56ef..637f419d1 100644
--- a/nsprpub/pr/tests/foreign.c
+++ b/nsprpub/pr/tests/foreign.c
@@ -52,7 +52,7 @@ static int _debug_on = 0;
 
 #define DPRINTF(arg)	if (_debug_on) PR_fprintf arg
 
-#if defined(_PR_PTHREADS)
+#if defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
 #include <pthread.h>
 #include "md/_pth.h"
 static void *pthread_start(void *arg)
@@ -63,7 +63,7 @@ static void *pthread_start(void *arg)
     start(data);
     return NULL;
 }  /* pthread_start */
-#endif /* defined(_PR_PTHREADS) */
+#endif /* defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS) */
 
 #if defined(IRIX) && !defined(_PR_PTHREADS)
 #include <sys/types.h>
@@ -109,7 +109,7 @@ static PRStatus NSPRPUB_TESTS_CreateThread(StartFn start, void *arg)
         }
         break;
     case thread_pthread:
-#if defined(_PR_PTHREADS)
+#if defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
         {
             int rv;
             pthread_t id;
@@ -137,7 +137,7 @@ static PRStatus NSPRPUB_TESTS_CreateThread(StartFn start, void *arg)
         PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
         rv = PR_FAILURE;
         break;
-#endif /* defined(_PR_PTHREADS) */
+#endif /* defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS) */
 
     case thread_sproc:
 #if defined(IRIX) && !defined(_PR_PTHREADS)
diff --git a/nsprpub/pr/tests/forktest.c b/nsprpub/pr/tests/forktest.c
index 66dc64575..a389fa479 100644
--- a/nsprpub/pr/tests/forktest.c
+++ b/nsprpub/pr/tests/forktest.c
@@ -196,6 +196,51 @@ finish:
     return;
 }
 
+#ifdef _PR_DCETHREADS
+
+#include <syscall.h>
+
+pid_t PR_UnixFork1(void)
+{
+    pid_t parent = getpid();
+    int rv = syscall(SYS_fork);
+
+    if (rv == -1) {
+        return (pid_t) -1;
+    } else {
+        /* For each process, rv is the pid of the other process */
+        if (rv == parent) {
+            /* the child */
+            return 0;
+        } else {
+            /* the parent */
+            return rv;
+        }
+    }
+}
+
+#elif defined(SOLARIS)
+
+/*
+ * It seems like that in Solaris 2.4 one must call fork1() if the
+ * the child process is going to use thread functions.  Solaris 2.5
+ * doesn't have this problem. Calling fork() also works. 
+ */
+
+pid_t PR_UnixFork1(void)
+{
+    return fork1();
+}
+
+#else
+
+pid_t PR_UnixFork1(void)
+{
+    return fork();
+}
+
+#endif  /* PR_DCETHREADS */
+
 int main(int argc, char **argv)
 {
     pid_t pid;
@@ -205,7 +250,7 @@ int main(int argc, char **argv)
 
     DoIO();
 
-    pid = fork();
+    pid = PR_UnixFork1();
 
     if (pid  == (pid_t) -1) {
         fprintf(stderr, "Fork failed: errno %d\n", errno);
diff --git a/nsprpub/pr/tests/provider.c b/nsprpub/pr/tests/provider.c
index 932241ec3..0e6569d66 100644
--- a/nsprpub/pr/tests/provider.c
+++ b/nsprpub/pr/tests/provider.c
@@ -606,7 +606,7 @@ typedef struct StartObject
     void *arg;
 } StartObject;
 
-#if defined(_PR_PTHREADS)
+#if defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
 #include "md/_pth.h"
 #include <pthread.h>
 
@@ -619,7 +619,7 @@ static void *pthread_start(void *arg)
     start(data);
     return NULL;
 }  /* pthread_start */
-#endif /* defined(_PR_PTHREADS) */
+#endif /* defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS) */
 
 #if defined(IRIX) && !defined(_PR_PTHREADS)
 #include <sys/types.h>
@@ -657,10 +657,10 @@ static PRStatus JoinThread(PRThread *thread)
         rv = PR_JoinThread(thread);
         break;
     case thread_pthread:
-#if defined(_PR_PTHREADS)
+#if defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
         rv = PR_SUCCESS;
         break;
-#endif /* defined(_PR_PTHREADS) */
+#endif /* defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS) */
     case thread_win32:
 #if defined(WIN32)
         rv = PR_SUCCESS;
@@ -690,7 +690,7 @@ static PRStatus NewThread(
         }
         break;
     case thread_pthread:
-#if defined(_PR_PTHREADS)
+#if defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
         {
             int rv;
             pthread_t id;
@@ -717,7 +717,7 @@ static PRStatus NewThread(
 #else
         PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
         rv = PR_FAILURE;
-#endif /* defined(_PR_PTHREADS) */
+#endif /* defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS) */
         break;
 
     case thread_sproc:
diff --git a/nsprpub/pr/tests/socket.c b/nsprpub/pr/tests/socket.c
index 92f019d01..5ee2b78f3 100644
--- a/nsprpub/pr/tests/socket.c
+++ b/nsprpub/pr/tests/socket.c
@@ -21,7 +21,7 @@
 #ifdef XP_UNIX
 #include <sys/mman.h>
 #endif
-#if defined(_PR_PTHREADS)
+#if defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
 #include <pthread.h>
 #endif
 
@@ -313,7 +313,7 @@ PRThread* create_new_thread(PRThreadType type,
 PRInt32 native_thread = 0;
 
 	PR_ASSERT(state == PR_UNJOINABLE_THREAD);
-#if defined(_PR_PTHREADS) || defined(WIN32)
+#if (defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)) || defined(WIN32)
 	switch(index %  4) {
 		case 0:
 			scope = (PR_LOCAL_THREAD);
@@ -332,7 +332,7 @@ PRInt32 native_thread = 0;
 			break;
 	}
 	if (native_thread) {
-#if defined(_PR_PTHREADS)
+#if defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
 		pthread_t tid;
 		if (!pthread_create(&tid, NULL, (void * (*)(void *)) start, arg))
 			return((PRThread *) tid);
diff --git a/nsprpub/pr/tests/testfile.c b/nsprpub/pr/tests/testfile.c
index 1191bfe94..23659876e 100644
--- a/nsprpub/pr/tests/testfile.c
+++ b/nsprpub/pr/tests/testfile.c
@@ -13,7 +13,7 @@
 #include <windows.h>
 #include <process.h>
 #endif
-#if defined(_PR_PTHREADS)
+#if defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
 #include <pthread.h>
 #endif
 #ifdef SYMBIAN
@@ -104,7 +104,7 @@ PRInt32 native_thread = 0;
 
 	PR_ASSERT(state == PR_UNJOINABLE_THREAD);
 
-#if defined(_PR_PTHREADS) || defined(WIN32) || defined(XP_OS2)
+#if (defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)) || defined(WIN32) || defined(XP_OS2)
 
 	switch(index %  4) {
 		case 0:
@@ -124,7 +124,7 @@ PRInt32 native_thread = 0;
 			break;
 	}
 	if (native_thread) {
-#if defined(_PR_PTHREADS)
+#if defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
 		pthread_t tid;
 		if (!pthread_create(&tid, NULL, start, arg))
 			return((PRThread *) tid);
diff --git a/nsprpub/pr/tests/thrpool_client.c b/nsprpub/pr/tests/thrpool_client.c
index 7f3df3271..a0e1e4c24 100644
--- a/nsprpub/pr/tests/thrpool_client.c
+++ b/nsprpub/pr/tests/thrpool_client.c
@@ -21,7 +21,7 @@
 #ifdef XP_UNIX
 #include <sys/mman.h>
 #endif
-#if defined(_PR_PTHREADS)
+#if defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
 #include <pthread.h>
 #endif
 
diff --git a/nsprpub/pr/tests/thrpool_server.c b/nsprpub/pr/tests/thrpool_server.c
index ef09f23b5..9665829a1 100644
--- a/nsprpub/pr/tests/thrpool_server.c
+++ b/nsprpub/pr/tests/thrpool_server.c
@@ -21,7 +21,7 @@
 #ifdef XP_UNIX
 #include <sys/mman.h>
 #endif
-#if defined(_PR_PTHREADS)
+#if defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
 #include <pthread.h>
 #endif
 
diff --git a/nsprpub/pr/tests/vercheck.c b/nsprpub/pr/tests/vercheck.c
index da2f7b1de..6170125de 100644
--- a/nsprpub/pr/tests/vercheck.c
+++ b/nsprpub/pr/tests/vercheck.c
@@ -39,8 +39,7 @@ static char *compatible_version[] = {
     "4.9.6",
     "4.10", "4.10.1", "4.10.2", "4.10.3", "4.10.4",
     "4.10.5", "4.10.6", "4.10.7", "4.10.8", "4.10.9",
-    "4.10.10", "4.11", "4.12", "4.13", "4.14", "4.15",
-    "4.16", "4.17",
+    "4.10.10", "4.11", "4.12", "4.13", "4.14", "4.15"
     PR_VERSION
 };
 
@@ -56,8 +55,8 @@ static char *incompatible_version[] = {
     "3.0", "3.0.1",
     "3.1", "3.1.1", "3.1.2", "3.1.3",
     "3.5", "3.5.1",
-    "4.18.1",
-    "4.19", "4.19.1",
+    "4.16.1",
+    "4.17", "4.17.1",
     "10.0", "11.1", "12.14.20"
 };