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/* 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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <glib.h>
#include <gthreadinit.h>
#ifdef G_THREADS_ENABLED
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);
#define G_MUTEX_DEBUG_INFO(mutex) (*((gpointer*)(((char*)mutex)+G_MUTEX_SIZE)))
typedef struct _ErrorCheckInfo ErrorCheckInfo;
struct _ErrorCheckInfo
{
gchar *location;
GThread *owner;
};
static GMutex *
g_mutex_new_errorcheck_impl (void)
{
GMutex *retval = g_thread_functions_for_glib_use_default.mutex_new ();
retval = g_realloc (retval, G_MUTEX_SIZE + sizeof (gpointer));
G_MUTEX_DEBUG_INFO (retval) = NULL;
return retval;
}
static void
g_mutex_lock_errorcheck_impl (GMutex *mutex,
gulong magic,
gchar *location)
{
ErrorCheckInfo *info;
GThread *self = g_thread_self ();
if (magic != G_MUTEX_DEBUG_MAGIC)
location = "unknown";
if (G_MUTEX_DEBUG_INFO (mutex) == NULL)
{
/* if the debug info is NULL, we have not yet locked that mutex,
* so we do it now */
g_thread_functions_for_glib_use_default.mutex_lock (mutex);
/* Now we have to check again, because another thread might have
* tried to lock the mutex at the same time we did. This
* technique is not 100% save on systems without decent cache
* coherence, but we have no choice */
if (G_MUTEX_DEBUG_INFO (mutex) == NULL)
{
info = G_MUTEX_DEBUG_INFO (mutex) = g_new0 (ErrorCheckInfo, 1);
}
g_thread_functions_for_glib_use_default.mutex_unlock (mutex);
}
info = G_MUTEX_DEBUG_INFO (mutex);
if (info->owner == self)
g_error ("Trying to recursivly lock a mutex at '%s', "
"previously locked at '%s'",
location, info->location);
g_thread_functions_for_glib_use_default.mutex_lock (mutex);
info->owner = self;
info->location = location;
}
static gboolean
g_mutex_trylock_errorcheck_impl (GMutex *mutex,
gulong magic,
gchar *location)
{
ErrorCheckInfo *info = G_MUTEX_DEBUG_INFO (mutex);
GThread *self = g_thread_self ();
if (magic != G_MUTEX_DEBUG_MAGIC)
location = "unknown";
if (!info)
{
/* This mutex has not yet been used, so simply lock and return TRUE */
g_mutex_lock_errorcheck_impl (mutex, magic, location);
return TRUE;
}
if (info->owner == self)
g_error ("Trying to recursivly lock a mutex at '%s', "
"previously locked at '%s'",
location, info->location);
if (!g_thread_functions_for_glib_use_default.mutex_trylock (mutex))
return FALSE;
info->owner = self;
info->location = location;
return TRUE;
}
static void
g_mutex_unlock_errorcheck_impl (GMutex *mutex,
gulong magic,
gchar *location)
{
ErrorCheckInfo *info = G_MUTEX_DEBUG_INFO (mutex);
GThread *self = g_thread_self ();
if (magic != G_MUTEX_DEBUG_MAGIC)
location = "unknown";
if (!info || info->owner == NULL)
g_error ("Trying to unlock an unlocked mutex at '%s'", location);
if (info->owner != self)
g_warning ("Trying to unlock a mutex at '%s', "
"previously locked by a different thread at '%s'",
location, info->location);
info->owner = NULL;
info->location = NULL;
g_thread_functions_for_glib_use_default.mutex_unlock (mutex);
}
static void
g_mutex_free_errorcheck_impl (GMutex *mutex,
gulong magic,
gchar *location)
{
ErrorCheckInfo *info = G_MUTEX_DEBUG_INFO (mutex);
if (magic != G_MUTEX_DEBUG_MAGIC)
location = "unknown";
if (info && info->owner != NULL)
g_error ("Trying to free a locked mutex at '%s', "
"which was previously locked at '%s'",
location, info->location);
g_free (G_MUTEX_DEBUG_INFO (mutex));
g_thread_functions_for_glib_use_default.mutex_free (mutex);
}
static void
g_cond_wait_errorcheck_impl (GCond *cond,
GMutex *mutex,
gulong magic,
gchar *location)
{
ErrorCheckInfo *info = G_MUTEX_DEBUG_INFO (mutex);
GThread *self = g_thread_self ();
if (magic != G_MUTEX_DEBUG_MAGIC)
location = "unknown";
if (!info || info->owner == NULL)
g_error ("Trying to use an unlocked mutex in g_cond_wait() at '%s'",
location);
if (info->owner != self)
g_error ("Trying to use a mutex locked by another thread in "
"g_cond_wait() at '%s'", location);
info->owner = NULL;
location = info->location;
g_thread_functions_for_glib_use_default.cond_wait (cond, mutex);
info->owner = self;
info->location = location;
}
static gboolean
g_cond_timed_wait_errorcheck_impl (GCond *cond,
GMutex *mutex,
GTimeVal *end_time,
gulong magic,
gchar *location)
{
ErrorCheckInfo *info = G_MUTEX_DEBUG_INFO (mutex);
GThread *self = g_thread_self ();
gboolean retval;
if (magic != G_MUTEX_DEBUG_MAGIC)
location = "unknown";
if (!info || info->owner == NULL)
g_error ("Trying to use an unlocked mutex in g_cond_timed_wait() at '%s'",
location);
if (info->owner != self)
g_error ("Trying to use a mutex locked by another thread in "
"g_cond_timed_wait() at '%s'", location);
info->owner = NULL;
location = info->location;
retval = g_thread_functions_for_glib_use_default.cond_timed_wait (cond,
mutex,
end_time);
info->owner = self;
info->location = location;
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;
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 */
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