Re: [PATCH] Unbreak multithreading on Unix95-class platforms

[Eric Botcazou <ebotcazou at libertysurf dot fr>]

> This patch unbreaks multithreading on those platforms by defining a new
> thread class, posix95, which implements recursive mutexes on top of classic
> POSIX mutexes.  It also enables them by default on Solaris 2.5.1 and
> Solaris 2.6.

I need a bit more to build the Java runtime:

GCC:
        PR target/18444
        * configure.ac (threading): Accept 'posix95'.
        * configure: Regenerate.
        * config.gcc (i[34567]86-*-solaris2*): On Solaris up to 2.6,
        include sol26.h and default to posix95 threads if have_pthread_h.
        (sparc-*-solaris2*): Likewise.
        * gthr.h: Include gthr-posix95.h if _PTHREADS95 is defined.
        * gthr-posix95.h: New file.
        * config/sol26.h: New file.
        * doc/install.texi (--enable-threads): Document 'posix95'.

Boehm-gc:
        PR target/18444
        * configure.ac (threading): Accept 'posix95'.
        * configure: Regenerate.

Libjava:
        PR target/18444
        * configure.ac (threading): Accept 'posix95'.
        * configure: Regenerate.


-- 
Eric Botcazou

Index: configure.ac
===================================================================
RCS file: /cvs/gcc/gcc/gcc/configure.ac,v
retrieving revision 2.83
diff -u -p -r2.83 configure.ac
--- configure.ac	5 Nov 2004 04:49:18 -0000	2.83
+++ configure.ac	15 Nov 2004 07:02:36 -0000
@@ -1266,7 +1266,7 @@ case ${enable_threads} in
     # default
     target_thread_file='single'
     ;;
-  aix | dce | gnat | irix | posix | rtems | \
+  aix | dce | gnat | irix | posix | posix95 | rtems | \
   single | solaris | vxworks | win32 )
     target_thread_file=${enable_threads}
     ;;
Index: configure
===================================================================
RCS file: /cvs/gcc/gcc/gcc/configure,v
retrieving revision 1.874
diff -u -p -r1.874 configure
--- configure	5 Nov 2004 04:49:08 -0000	1.874
+++ configure	15 Nov 2004 07:02:41 -0000
@@ -11976,7 +11976,7 @@ case ${enable_threads} in
     # default
     target_thread_file='single'
     ;;
-  aix | dce | gnat | irix | posix | rtems | \
+  aix | dce | gnat | irix | posix | posix95 | rtems | \
   single | solaris | vxworks | win32 )
     target_thread_file=${enable_threads}
     ;;
Index: config.gcc
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config.gcc,v
retrieving revision 1.496
diff -u -r1.496 config.gcc
--- config.gcc	18 Nov 2004 01:07:04 -0000	1.496
+++ config.gcc	20 Nov 2004 10:15:41 -0000
@@ -1012,7 +1012,12 @@
 	;;
 i[34567]86-*-solaris2*)
 	xm_defines="SMALL_ARG_MAX"
-	tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h svr4.h i386/sysv4.h sol2.h i386/sol2.h"
+	tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h svr4.h i386/sysv4.h sol2.h"
+	case ${target} in
+	*-*-solaris2.[0-6] | *-*-solaris2.[0-6].*)
+		tm_file="${tm_file} sol26.h"
+	esac
+	tm_file="${tm_file} i386/sol2.h"
 	tmake_file="t-sol2 i386/t-sol2 t-svr4"
 	c_target_objs="sol2-c.o"
 	cxx_target_objs="sol2-c.o"
@@ -1044,8 +1049,19 @@
 		;;
 	esac
 	case ${enable_threads}:${have_pthread_h}:${have_thread_h} in
-	  "":yes:* | yes:yes:* ) thread_file=posix ;;
-	  "":*:yes | yes:*:yes ) thread_file=solaris ;;
+	  "":yes:* | yes:yes:* )
+		case ${target} in
+		  *-*-solaris2.[0-6] | *-*-solaris2.[0-6].*)
+			thread_file=posix95
+			;;
+		  *)
+			thread_file=posix
+			;;
+		esac
+		;;
+	  "":*:yes | yes:*:yes )
+		thread_file=solaris
+		;;
 	esac
 	;;
 i[34567]86-*-sysv5*)           # Intel x86 on System V Release 5
@@ -1902,7 +1918,12 @@
 	need_64bit_hwint=yes
 	;;
 sparc-*-solaris2*)
-	tm_file="${tm_file} dbxelf.h elfos.h svr4.h sparc/sysv4.h sol2.h sparc/sol2.h"
+	tm_file="${tm_file} dbxelf.h elfos.h svr4.h sparc/sysv4.h sol2.h"
+	case ${target} in
+	*-*-solaris2.[0-6] | *-*-solaris2.[0-6].*)
+		tm_file="${tm_file} sol26.h"
+	esac
+	tm_file="${tm_file} sparc/sol2.h"
 	if test x$gnu_ld = xyes; then
 		tm_file="${tm_file} sparc/sol2-gld.h"
 	fi
@@ -1939,8 +1960,19 @@
 	tm_p_file="${tm_p_file} sol2-protos.h"
 	extra_parts="crt1.o crti.o crtn.o gcrt1.o gmon.o crtbegin.o crtend.o"
 	case ${enable_threads}:${have_pthread_h}:${have_thread_h} in
-	  "":yes:* | yes:yes:* ) thread_file=posix ;;
-	  "":*:yes | yes:*:yes ) thread_file=solaris ;;
+	  "":yes:* | yes:yes:* )
+		case ${target} in
+		  *-*-solaris2.[0-6] | *-*-solaris2.[0-6].*)
+			thread_file=posix95
+			;;
+		  *)
+			thread_file=posix
+			;;
+		esac
+		;;
+	  "":*:yes | yes:*:yes )
+		thread_file=solaris
+		;;
 	esac
 	;;
 sparc-*-sysv4*)
Index: gthr.h
===================================================================
RCS file: /cvs/gcc/gcc/gcc/gthr.h,v
retrieving revision 1.18
diff -u -p -r1.18 gthr.h
--- gthr.h	22 Oct 2004 15:03:23 -0000	1.18
+++ gthr.h	15 Nov 2004 07:02:41 -0000
@@ -83,7 +83,9 @@ Software Foundation, 59 Temple Place - S
    number.  If the operation is not supported, -1 is returned.
 
    Currently supported threads packages are
-     POSIX threads with -D_PTHREADS
+     TPF threads with -D__tpf__
+     POSIX/Unix98 threads with -D_PTHREADS
+     POSIX/Unix95 threads with -D_PTHREADS95
      DCE threads with -D_DCE_THREADS
      Solaris/UI threads with -D_SOLARIS_THREADS
 */
@@ -93,6 +95,8 @@ Software Foundation, 59 Temple Place - S
 #include "gthr-tpf.h"
 #elif _PTHREADS
 #include "gthr-posix.h"
+#elif _PTHREADS95
+#include "gthr-posix95.h"
 #elif _DCE_THREADS
 #include "gthr-dce.h"
 #elif _SOLARIS_THREADS
Index: doc/install.texi
===================================================================
RCS file: /cvs/gcc/gcc/gcc/doc/install.texi,v
retrieving revision 1.329
diff -u -p -r1.329 install.texi
--- doc/install.texi	13 Nov 2004 20:14:21 -0000	1.329
+++ doc/install.texi	15 Nov 2004 07:02:44 -0000
@@ -926,7 +926,9 @@ missing and thus this setting will cause
 @item no
 This is an alias for @samp{single}.
 @item posix
-Generic POSIX thread support.
+Generic POSIX/Unix98 thread support.
+@item posix95
+Generic POSIX/Unix95 thread support.
 @item rtems
 RTEMS thread support.
 @item single
--- /dev/null	1970-01-01 01:00:00.000000000 +0100
+++ gthr-posix95.h	2004-11-15 07:56:18.829087072 +0100
@@ -0,0 +1,592 @@
+/* Threads compatibility routines for libgcc2 and libobjc.  */
+/* Compile this one with gcc.  */
+/* Copyright (C) 2004 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 2, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING.  If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA.  */
+
+/* As a special exception, if you link this library with other files,
+   some of which are compiled with GCC, to produce an executable,
+   this library does not by itself cause the resulting executable
+   to be covered by the GNU General Public License.
+   This exception does not however invalidate any other reasons why
+   the executable file might be covered by the GNU General Public License.  */
+
+#ifndef GCC_GTHR_POSIX_H
+#define GCC_GTHR_POSIX_H
+
+/* POSIX threads specific definitions.
+   Easy, since the interface is just one-to-one mapping.  */
+
+#define __GTHREADS 1
+
+/* Some implementations of <pthread.h> require this to be defined.  */
+#ifndef _REENTRANT
+#define _REENTRANT 1
+#endif
+
+#include <pthread.h>
+#include <unistd.h>
+
+typedef pthread_key_t __gthread_key_t;
+typedef pthread_once_t __gthread_once_t;
+typedef pthread_mutex_t __gthread_mutex_t;
+
+typedef struct {
+  long depth;
+  pthread_t owner;
+  pthread_mutex_t actual;
+} __gthread_recursive_mutex_t;
+
+#define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
+#define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT
+#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
+
+#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
+
+#pragma weak pthread_once
+#pragma weak pthread_key_create
+#pragma weak pthread_key_delete
+#pragma weak pthread_getspecific
+#pragma weak pthread_setspecific
+#pragma weak pthread_create
+#pragma weak pthread_self
+
+#pragma weak pthread_mutex_lock
+#pragma weak pthread_mutex_trylock
+#pragma weak pthread_mutex_unlock
+#pragma weak pthread_mutexattr_init
+#pragma weak pthread_mutexattr_settype
+#pragma weak pthread_mutexattr_destroy
+
+#pragma weak pthread_mutex_init
+
+#if defined(_LIBOBJC) || defined(_LIBOBJC_WEAK)
+/* Objective-C.  */
+#pragma weak pthread_cond_broadcast
+#pragma weak pthread_cond_destroy
+#pragma weak pthread_cond_init
+#pragma weak pthread_cond_signal
+#pragma weak pthread_cond_wait
+#pragma weak pthread_exit
+#pragma weak pthread_mutex_destroy
+#pragma weak pthread_self
+#ifdef _POSIX_PRIORITY_SCHEDULING
+#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
+#pragma weak sched_get_priority_max
+#pragma weak sched_get_priority_min
+#endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
+#endif /* _POSIX_PRIORITY_SCHEDULING */
+#pragma weak sched_yield
+#pragma weak pthread_attr_destroy
+#pragma weak pthread_attr_init
+#pragma weak pthread_attr_setdetachstate
+#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
+#pragma weak pthread_getschedparam
+#pragma weak pthread_setschedparam
+#endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
+#endif /* _LIBOBJC || _LIBOBJC_WEAK */
+
+static inline int
+__gthread_active_p (void)
+{
+  static void *const __gthread_active_ptr 
+    = __extension__ (void *) &pthread_create;
+  return __gthread_active_ptr != 0;
+}
+
+#else /* not SUPPORTS_WEAK */
+
+static inline int
+__gthread_active_p (void)
+{
+  return 1;
+}
+
+#endif /* SUPPORTS_WEAK */
+
+#ifdef _LIBOBJC
+
+/* This is the config.h file in libobjc/ */
+#include <config.h>
+
+#ifdef HAVE_SCHED_H
+# include <sched.h>
+#endif
+
+/* Key structure for maintaining thread specific storage */
+static pthread_key_t _objc_thread_storage;
+static pthread_attr_t _objc_thread_attribs;
+
+/* Thread local storage for a single thread */
+static void *thread_local_storage = NULL;
+
+/* Backend initialization functions */
+
+/* Initialize the threads subsystem.  */
+static inline int
+__gthread_objc_init_thread_system (void)
+{
+  if (__gthread_active_p ())
+    {
+      /* Initialize the thread storage key.  */
+      if (pthread_key_create (&_objc_thread_storage, NULL) == 0)
+	{
+	  /* The normal default detach state for threads is
+	   * PTHREAD_CREATE_JOINABLE which causes threads to not die
+	   * when you think they should.  */
+	  if (pthread_attr_init (&_objc_thread_attribs) == 0
+	      && pthread_attr_setdetachstate (&_objc_thread_attribs,
+					      PTHREAD_CREATE_DETACHED) == 0)
+	    return 0;
+	}
+    }
+
+  return -1;
+}
+
+/* Close the threads subsystem.  */
+static inline int
+__gthread_objc_close_thread_system (void)
+{
+  if (__gthread_active_p ()
+      && pthread_key_delete (_objc_thread_storage) == 0
+      && pthread_attr_destroy (&_objc_thread_attribs) == 0)
+    return 0;
+
+  return -1;
+}
+
+/* Backend thread functions */
+
+/* Create a new thread of execution.  */
+static inline objc_thread_t
+__gthread_objc_thread_detach (void (*func)(void *), void *arg)
+{
+  objc_thread_t thread_id;
+  pthread_t new_thread_handle;
+
+  if (!__gthread_active_p ())
+    return NULL;
+
+  if (!(pthread_create (&new_thread_handle, NULL, (void *) func, arg)))
+    thread_id = (objc_thread_t) new_thread_handle;
+  else
+    thread_id = NULL;
+
+  return thread_id;
+}
+
+/* Set the current thread's priority.  */
+static inline int
+__gthread_objc_thread_set_priority (int priority)
+{
+  if (!__gthread_active_p ())
+    return -1;
+  else
+    {
+#ifdef _POSIX_PRIORITY_SCHEDULING
+#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
+      pthread_t thread_id = pthread_self ();
+      int policy;
+      struct sched_param params;
+      int priority_min, priority_max;
+
+      if (pthread_getschedparam (thread_id, &policy, &params) == 0)
+	{
+	  if ((priority_max = sched_get_priority_max (policy)) == -1)
+	    return -1;
+
+	  if ((priority_min = sched_get_priority_min (policy)) == -1)
+	    return -1;
+
+	  if (priority > priority_max)
+	    priority = priority_max;
+	  else if (priority < priority_min)
+	    priority = priority_min;
+	  params.sched_priority = priority;
+
+	  /*
+	   * The solaris 7 and several other man pages incorrectly state that
+	   * this should be a pointer to policy but pthread.h is universally
+	   * at odds with this.
+	   */
+	  if (pthread_setschedparam (thread_id, policy, &params) == 0)
+	    return 0;
+	}
+#endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
+#endif /* _POSIX_PRIORITY_SCHEDULING */
+      return -1;
+    }
+}
+
+/* Return the current thread's priority.  */
+static inline int
+__gthread_objc_thread_get_priority (void)
+{
+#ifdef _POSIX_PRIORITY_SCHEDULING
+#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
+  if (__gthread_active_p ())
+    {
+      int policy;
+      struct sched_param params;
+
+      if (pthread_getschedparam (pthread_self (), &policy, &params) == 0)
+	return params.sched_priority;
+      else
+	return -1;
+    }
+  else
+#endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
+#endif /* _POSIX_PRIORITY_SCHEDULING */
+    return OBJC_THREAD_INTERACTIVE_PRIORITY;
+}
+
+/* Yield our process time to another thread.  */
+static inline void
+__gthread_objc_thread_yield (void)
+{
+  if (__gthread_active_p ())
+    sched_yield ();
+}
+
+/* Terminate the current thread.  */
+static inline int
+__gthread_objc_thread_exit (void)
+{
+  if (__gthread_active_p ())
+    /* exit the thread */
+    pthread_exit (&__objc_thread_exit_status);
+
+  /* Failed if we reached here */
+  return -1;
+}
+
+/* Returns an integer value which uniquely describes a thread.  */
+static inline objc_thread_t
+__gthread_objc_thread_id (void)
+{
+  if (__gthread_active_p ())
+    return (objc_thread_t) pthread_self ();
+  else
+    return (objc_thread_t) 1;
+}
+
+/* Sets the thread's local storage pointer.  */
+static inline int
+__gthread_objc_thread_set_data (void *value)
+{
+  if (__gthread_active_p ())
+    return pthread_setspecific (_objc_thread_storage, value);
+  else
+    {
+      thread_local_storage = value;
+      return 0;
+    }
+}
+
+/* Returns the thread's local storage pointer.  */
+static inline void *
+__gthread_objc_thread_get_data (void)
+{
+  if (__gthread_active_p ())
+    return pthread_getspecific (_objc_thread_storage);
+  else
+    return thread_local_storage;
+}
+
+/* Backend mutex functions */
+
+/* Allocate a mutex.  */
+static inline int
+__gthread_objc_mutex_allocate (objc_mutex_t mutex)
+{
+  if (__gthread_active_p ())
+    {
+      mutex->backend = objc_malloc (sizeof (pthread_mutex_t));
+
+      if (pthread_mutex_init ((pthread_mutex_t *) mutex->backend, NULL))
+	{
+	  objc_free (mutex->backend);
+	  mutex->backend = NULL;
+	  return -1;
+	}
+    }
+
+  return 0;
+}
+
+/* Deallocate a mutex.  */
+static inline int
+__gthread_objc_mutex_deallocate (objc_mutex_t mutex)
+{
+  if (__gthread_active_p ())
+    {
+      int count;
+
+      /*
+       * Posix Threads specifically require that the thread be unlocked
+       * for pthread_mutex_destroy to work.
+       */
+
+      do
+	{
+	  count = pthread_mutex_unlock ((pthread_mutex_t *) mutex->backend);
+	  if (count < 0)
+	    return -1;
+	}
+      while (count);
+
+      if (pthread_mutex_destroy ((pthread_mutex_t *) mutex->backend))
+	return -1;
+
+      objc_free (mutex->backend);
+      mutex->backend = NULL;
+    }
+  return 0;
+}
+
+/* Grab a lock on a mutex.  */
+static inline int
+__gthread_objc_mutex_lock (objc_mutex_t mutex)
+{
+  if (__gthread_active_p ()
+      && pthread_mutex_lock ((pthread_mutex_t *) mutex->backend) != 0)
+    {
+      return -1;
+    }
+
+  return 0;
+}
+
+/* Try to grab a lock on a mutex.  */
+static inline int
+__gthread_objc_mutex_trylock (objc_mutex_t mutex)
+{
+  if (__gthread_active_p ()
+      && pthread_mutex_trylock ((pthread_mutex_t *) mutex->backend) != 0)
+    {
+      return -1;
+    }
+
+  return 0;
+}
+
+/* Unlock the mutex */
+static inline int
+__gthread_objc_mutex_unlock (objc_mutex_t mutex)
+{
+  if (__gthread_active_p ()
+      && pthread_mutex_unlock ((pthread_mutex_t *) mutex->backend) != 0)
+    {
+      return -1;
+    }
+
+  return 0;
+}
+
+/* Backend condition mutex functions */
+
+/* Allocate a condition.  */
+static inline int
+__gthread_objc_condition_allocate (objc_condition_t condition)
+{
+  if (__gthread_active_p ())
+    {
+      condition->backend = objc_malloc (sizeof (pthread_cond_t));
+
+      if (pthread_cond_init ((pthread_cond_t *) condition->backend, NULL))
+	{
+	  objc_free (condition->backend);
+	  condition->backend = NULL;
+	  return -1;
+	}
+    }
+
+  return 0;
+}
+
+/* Deallocate a condition.  */
+static inline int
+__gthread_objc_condition_deallocate (objc_condition_t condition)
+{
+  if (__gthread_active_p ())
+    {
+      if (pthread_cond_destroy ((pthread_cond_t *) condition->backend))
+	return -1;
+
+      objc_free (condition->backend);
+      condition->backend = NULL;
+    }
+  return 0;
+}
+
+/* Wait on the condition */
+static inline int
+__gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex)
+{
+  if (__gthread_active_p ())
+    return pthread_cond_wait ((pthread_cond_t *) condition->backend,
+			      (pthread_mutex_t *) mutex->backend);
+  else
+    return 0;
+}
+
+/* Wake up all threads waiting on this condition.  */
+static inline int
+__gthread_objc_condition_broadcast (objc_condition_t condition)
+{
+  if (__gthread_active_p ())
+    return pthread_cond_broadcast ((pthread_cond_t *) condition->backend);
+  else
+    return 0;
+}
+
+/* Wake up one thread waiting on this condition.  */
+static inline int
+__gthread_objc_condition_signal (objc_condition_t condition)
+{
+  if (__gthread_active_p ())
+    return pthread_cond_signal ((pthread_cond_t *) condition->backend);
+  else
+    return 0;
+}
+
+#else /* _LIBOBJC */
+
+static inline int
+__gthread_once (__gthread_once_t *once, void (*func) (void))
+{
+  if (__gthread_active_p ())
+    return pthread_once (once, func);
+  else
+    return -1;
+}
+
+static inline int
+__gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
+{
+  return pthread_key_create (key, dtor);
+}
+
+static inline int
+__gthread_key_delete (__gthread_key_t key)
+{
+  return pthread_key_delete (key);
+}
+
+static inline void *
+__gthread_getspecific (__gthread_key_t key)
+{
+  return pthread_getspecific (key);
+}
+
+static inline int
+__gthread_setspecific (__gthread_key_t key, const void *ptr)
+{
+  return pthread_setspecific (key, ptr);
+}
+
+static inline int
+__gthread_mutex_lock (__gthread_mutex_t *mutex)
+{
+  if (__gthread_active_p ())
+    return pthread_mutex_lock (mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_mutex_trylock (__gthread_mutex_t *mutex)
+{
+  if (__gthread_active_p ())
+    return pthread_mutex_trylock (mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_mutex_unlock (__gthread_mutex_t *mutex)
+{
+  if (__gthread_active_p ())
+    return pthread_mutex_unlock (mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex)
+{
+  mutex->depth = 0;
+  mutex->owner = (pthread_t) 0;
+  return pthread_mutex_init (&mutex->actual, NULL);
+}
+
+static inline int
+__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
+{
+  if (__gthread_active_p ())
+    {
+      pthread_t me = pthread_self ();
+
+      if (mutex->owner != me)
+	{
+	  pthread_mutex_lock (&mutex->actual);
+	  mutex->owner = me;
+	}
+
+      mutex->depth++;
+    }
+  return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
+{
+  if (__gthread_active_p ())
+    {
+      pthread_t me = pthread_self ();
+
+      if (mutex->owner != me)
+	{
+	  if (pthread_mutex_trylock (&mutex->actual))
+	    return 1;
+	  mutex->owner = me;
+	}
+
+      mutex->depth++;
+    }
+  return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
+{
+  if (__gthread_active_p ())
+    {
+      if (--mutex->depth == 0)
+        {
+	   mutex->owner = (pthread_t) 0;
+	   pthread_mutex_unlock (&mutex->actual);
+	}
+    }
+  return 0;
+}
+
+#endif /* _LIBOBJC */
+
+#endif /* ! GCC_GTHR_POSIX_H */
--- /dev/null	1970-01-01 01:00:00.000000000 +0100
+++ config/sol26.h	2004-11-14 14:35:15.000000000 +0100
@@ -0,0 +1,27 @@
+/* Operating system specific defines to be used when targeting GCC for any
+   Solaris 2 system up to Solaris 2.6.
+   Copyright 2004 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#undef CPP_SUBTARGET_SPEC
+#define CPP_SUBTARGET_SPEC "\
+%{pthreads:-D_REENTRANT -D_PTHREADS95} \
+%{!pthreads:%{threads:-D_REENTRANT -D_SOLARIS_THREADS}} \
+%{compat-bsd:-iwithprefixbefore ucbinclude -I/usr/ucbinclude} \
+"
Index: boehm-gc/configure.ac
===================================================================
RCS file: /cvs/gcc/gcc/boehm-gc/configure.ac,v
retrieving revision 1.6
diff -u -r1.6 configure.ac
--- boehm-gc/configure.ac	5 Nov 2004 01:51:50 -0000	1.6
+++ boehm-gc/configure.ac	21 Nov 2004 18:34:56 -0000
@@ -120,7 +120,7 @@
  no | none | single)
     THREADS=none
     ;;
- posix | pthreads)
+ posix | posix95 | pthreads)
     THREADS=posix
     THREADLIBS=-lpthread
     case "$host" in
Index: boehm-gc/configure
===================================================================
RCS file: /cvs/gcc/gcc/boehm-gc/configure,v
retrieving revision 1.85
diff -u -r1.85 configure
--- boehm-gc/configure	5 Nov 2004 01:51:48 -0000	1.85
+++ boehm-gc/configure	21 Nov 2004 18:34:59 -0000
@@ -5306,7 +5306,7 @@
  no | none | single)
     THREADS=none
     ;;
- posix | pthreads)
+ posix | posix95 | pthreads)
     THREADS=posix
     THREADLIBS=-lpthread
     case "$host" in
Index: libjava/configure.ac
===================================================================
RCS file: /cvs/gcc/gcc/libjava/configure.ac,v
retrieving revision 1.12
diff -u -r1.12 configure.ac
--- libjava/configure.ac	27 Oct 2004 02:43:42 -0000	1.12
+++ libjava/configure.ac	21 Nov 2004 18:40:45 -0000
@@ -617,7 +617,7 @@
  no | none | single)
     THREADS=none
     ;;
- posix | pthreads)
+ posix | posix95 | pthreads)
     THREADS=posix
     case "$host" in
      *-*-linux*)
Index: libjava/configure
===================================================================
RCS file: /cvs/gcc/gcc/libjava/configure,v
retrieving revision 1.242
diff -u -r1.242 configure
--- libjava/configure	27 Oct 2004 02:43:39 -0000	1.242
+++ libjava/configure	21 Nov 2004 18:40:50 -0000
@@ -8298,7 +8298,7 @@
  no | none | single)
     THREADS=none
     ;;
- posix | pthreads)
+ posix | posix95 | pthreads)
     THREADS=posix
     case "$host" in
      *-*-linux*)