glib/gthread/gthread-impl.c
Matthias Clasen 4bbde50716 Revert an accidental ABI break by moving gettime out of the
2007-01-16  Matthias Clasen  <mclasen@redhat.com>

        * glib/gthread.h:
        * glib/gthread.c:
        * glib/glib.symbols: Revert an accidental ABI break by
        moving gettime out of the GThreadFunctions struct and making
        it a separate variable.  (#397139, Joe Marcus Clarke)

        * gthread/*.c: Adapt.



svn path=/trunk/; revision=5279
2007-01-16 21:25:03 +00:00

367 lines
11 KiB
C

/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* gthread.c: thread related functions
* Copyright 1998 Sebastian Wilhelmi; University of Karlsruhe
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
/*
* MT safe
*/
#include "config.h"
#include "glib.h"
#include "gthreadprivate.h"
#ifdef G_THREADS_ENABLED
static GSystemThread zero_thread; /* This is initialized to all zero */
static gboolean thread_system_already_initialized = FALSE;
static gint g_thread_priority_map [G_THREAD_PRIORITY_URGENT + 1];
#include G_THREAD_SOURCE
#ifndef PRIORITY_LOW_VALUE
# define PRIORITY_LOW_VALUE 0
#endif
#ifndef PRIORITY_URGENT_VALUE
# define PRIORITY_URGENT_VALUE 0
#endif
#ifndef PRIORITY_NORMAL_VALUE
# define PRIORITY_NORMAL_VALUE \
((PRIORITY_LOW_VALUE * 6 + PRIORITY_URGENT_VALUE * 4) / 10)
#endif /* PRIORITY_NORMAL_VALUE */
#ifndef PRIORITY_HIGH_VALUE
# define PRIORITY_HIGH_VALUE \
((PRIORITY_NORMAL_VALUE + PRIORITY_URGENT_VALUE * 2) / 3)
#endif /* PRIORITY_HIGH_VALUE */
void g_mutex_init (void);
void g_mem_init (void);
void g_messages_init (void);
void g_convert_init (void);
void g_rand_init (void);
void g_main_thread_init (void);
typedef struct _GMutexDebugInfo GMutexDebugInfo;
struct _GMutexDebugInfo
{
gchar *location;
GSystemThread owner;
};
#define G_MUTEX_DEBUG_INFO(mutex) \
(((GMutexDebugInfo*)(((char*)mutex)+G_MUTEX_SIZE)))
static GMutex *
g_mutex_new_errorcheck_impl (void)
{
GMutex *retval = g_thread_functions_for_glib_use_default.mutex_new ();
GMutexDebugInfo *info;
retval = g_realloc (retval, G_MUTEX_SIZE + sizeof (GMutexDebugInfo));
info = G_MUTEX_DEBUG_INFO (retval);
g_system_thread_assign (info->owner, zero_thread);
info->location = "invalid";
return retval;
}
static void
g_mutex_lock_errorcheck_impl (GMutex *mutex,
const gulong magic,
gchar * const location)
{
GMutexDebugInfo *info = G_MUTEX_DEBUG_INFO (mutex);
gchar *loc = (magic == G_MUTEX_DEBUG_MAGIC) ? location : "unknown";
GSystemThread self;
g_thread_functions_for_glib_use.thread_self (&self);
if (g_system_thread_equal (info->owner, self))
g_error ("Trying to recursivly lock a mutex at '%s', "
"previously locked at '%s'",
loc, info->location);
g_thread_functions_for_glib_use_default.mutex_lock (mutex);
g_system_thread_assign (info->owner, self);
info->location = loc;
}
static gboolean
g_mutex_trylock_errorcheck_impl (GMutex *mutex,
const gulong magic,
gchar * const location)
{
GMutexDebugInfo *info = G_MUTEX_DEBUG_INFO (mutex);
gchar *loc = (magic == G_MUTEX_DEBUG_MAGIC) ? location : "unknown";
GSystemThread self;
g_thread_functions_for_glib_use.thread_self (&self);
if (g_system_thread_equal (info->owner, self))
g_error ("Trying to recursivly lock a mutex at '%s', "
"previously locked at '%s'",
loc, info->location);
if (!g_thread_functions_for_glib_use_default.mutex_trylock (mutex))
return FALSE;
g_system_thread_assign (info->owner, self);
info->location = loc;
return TRUE;
}
static void
g_mutex_unlock_errorcheck_impl (GMutex *mutex,
const gulong magic,
gchar * const location)
{
GMutexDebugInfo *info = G_MUTEX_DEBUG_INFO (mutex);
gchar *loc = (magic == G_MUTEX_DEBUG_MAGIC) ? location : "unknown";
GSystemThread self;
g_thread_functions_for_glib_use.thread_self (&self);
if (g_system_thread_equal (info->owner, zero_thread))
g_error ("Trying to unlock an unlocked mutex at '%s'", loc);
if (!g_system_thread_equal (info->owner, self))
g_warning ("Trying to unlock a mutex at '%s', "
"previously locked by a different thread at '%s'",
loc, info->location);
g_system_thread_assign (info->owner, zero_thread);
info->location = NULL;
g_thread_functions_for_glib_use_default.mutex_unlock (mutex);
}
static void
g_mutex_free_errorcheck_impl (GMutex *mutex,
const gulong magic,
gchar * const location)
{
GMutexDebugInfo *info = G_MUTEX_DEBUG_INFO (mutex);
gchar *loc = (magic == G_MUTEX_DEBUG_MAGIC) ? location : "unknown";
if (info && !g_system_thread_equal (info->owner, zero_thread))
g_error ("Trying to free a locked mutex at '%s', "
"which was previously locked at '%s'",
loc, info->location);
g_thread_functions_for_glib_use_default.mutex_free (mutex);
}
static void
g_cond_wait_errorcheck_impl (GCond *cond,
GMutex *mutex,
const gulong magic,
gchar * const location)
{
GMutexDebugInfo *info = G_MUTEX_DEBUG_INFO (mutex);
gchar *loc = (magic == G_MUTEX_DEBUG_MAGIC) ? location : "unknown";
GSystemThread self;
g_thread_functions_for_glib_use.thread_self (&self);
if (g_system_thread_equal (info->owner, zero_thread))
g_error ("Trying to use an unlocked mutex in g_cond_wait() at '%s'", loc);
if (!g_system_thread_equal (info->owner, self))
g_error ("Trying to use a mutex locked by another thread in "
"g_cond_wait() at '%s'", loc);
g_system_thread_assign (info->owner, zero_thread);
loc = info->location;
g_thread_functions_for_glib_use_default.cond_wait (cond, mutex);
g_system_thread_assign (info->owner, self);
info->location = loc;
}
static gboolean
g_cond_timed_wait_errorcheck_impl (GCond *cond,
GMutex *mutex,
GTimeVal *end_time,
const gulong magic,
gchar * const location)
{
GMutexDebugInfo *info = G_MUTEX_DEBUG_INFO (mutex);
gchar *loc = (magic == G_MUTEX_DEBUG_MAGIC) ? location : "unknown";
gboolean retval;
GSystemThread self;
g_thread_functions_for_glib_use.thread_self (&self);
if (g_system_thread_equal (info->owner, zero_thread))
g_error ("Trying to use an unlocked mutex in g_cond_timed_wait() at '%s'",
loc);
if (!g_system_thread_equal (info->owner, self))
g_error ("Trying to use a mutex locked by another thread in "
"g_cond_timed_wait() at '%s'", loc);
g_system_thread_assign (info->owner, zero_thread);
loc = info->location;
retval = g_thread_functions_for_glib_use_default.cond_timed_wait (cond,
mutex,
end_time);
g_system_thread_assign (info->owner, self);
info->location = loc;
return retval;
}
/* unshadow function declaration. See gthread.h */
#undef g_thread_init
void
g_thread_init_with_errorcheck_mutexes (GThreadFunctions* init)
{
GThreadFunctions errorcheck_functions;
if (init)
g_error ("Errorcheck mutexes can only be used for native "
"thread implementations. Sorry." );
#ifdef HAVE_G_THREAD_IMPL_INIT
/* This isn't called in g_thread_init, as it doesn't think to get
* the default implementation, so we have to call it on our own.
*
* We must call this before copying
* g_thread_functions_for_glib_use_default as the
* implementation-specific init function might modify the contents
* of g_thread_functions_for_glib_use_default based on operating
* system version, C library version, or whatever. */
g_thread_impl_init();
#endif /* HAVE_G_THREAD_IMPL_INIT */
errorcheck_functions = g_thread_functions_for_glib_use_default;
errorcheck_functions.mutex_new = g_mutex_new_errorcheck_impl;
errorcheck_functions.mutex_lock =
(void (*)(GMutex *)) g_mutex_lock_errorcheck_impl;
errorcheck_functions.mutex_trylock =
(gboolean (*)(GMutex *)) g_mutex_trylock_errorcheck_impl;
errorcheck_functions.mutex_unlock =
(void (*)(GMutex *)) g_mutex_unlock_errorcheck_impl;
errorcheck_functions.mutex_free =
(void (*)(GMutex *)) g_mutex_free_errorcheck_impl;
errorcheck_functions.cond_wait =
(void (*)(GCond *, GMutex *)) g_cond_wait_errorcheck_impl;
errorcheck_functions.cond_timed_wait =
(gboolean (*)(GCond *, GMutex *, GTimeVal *))
g_cond_timed_wait_errorcheck_impl;
g_thread_init (&errorcheck_functions);
}
void
g_thread_init (GThreadFunctions* init)
{
gboolean supported;
if (thread_system_already_initialized)
g_error ("GThread system may only be initialized once.");
thread_system_already_initialized = TRUE;
if (init == NULL)
{
#ifdef HAVE_G_THREAD_IMPL_INIT
/* now do any initialization stuff required by the
* implementation, but only if called with a NULL argument, of
* course. Otherwise it's up to the user to do so. */
g_thread_impl_init();
#endif /* HAVE_G_THREAD_IMPL_INIT */
init = &g_thread_functions_for_glib_use_default;
}
else
g_thread_use_default_impl = FALSE;
g_thread_functions_for_glib_use = *init;
if (g_thread_gettime_impl)
g_thread_gettime = g_thread_gettime_impl;
supported = (init->mutex_new &&
init->mutex_lock &&
init->mutex_trylock &&
init->mutex_unlock &&
init->mutex_free &&
init->cond_new &&
init->cond_signal &&
init->cond_broadcast &&
init->cond_wait &&
init->cond_timed_wait &&
init->cond_free &&
init->private_new &&
init->private_get &&
init->private_set &&
init->thread_create &&
init->thread_yield &&
init->thread_join &&
init->thread_exit &&
init->thread_set_priority &&
init->thread_self);
/* if somebody is calling g_thread_init (), it means that he wants to
* have thread support, so check this
*/
if (!supported)
{
if (g_thread_use_default_impl)
g_error ("Threads are not supported on this platform.");
else
g_error ("The supplied thread function vector is invalid.");
}
g_thread_priority_map [G_THREAD_PRIORITY_LOW] = PRIORITY_LOW_VALUE;
g_thread_priority_map [G_THREAD_PRIORITY_NORMAL] = PRIORITY_NORMAL_VALUE;
g_thread_priority_map [G_THREAD_PRIORITY_HIGH] = PRIORITY_HIGH_VALUE;
g_thread_priority_map [G_THREAD_PRIORITY_URGENT] = PRIORITY_URGENT_VALUE;
g_thread_init_glib ();
}
#else /* !G_THREADS_ENABLED */
void
g_thread_init (GThreadFunctions* init)
{
g_error ("GLib thread support is disabled.");
}
#endif /* !G_THREADS_ENABLED */