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gthread-impl.c
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gthread-impl.c
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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>
static gboolean thread_system_already_initialized = FALSE;
static gint g_thread_map_priority (GThreadPriority priority);
static gint g_thread_min_priority = 0;
static gint g_thread_max_priority = 0;
#include G_THREAD_SOURCE
void g_mutex_init (void);
void g_mem_init (void);
void g_messages_init (void);
#define G_MUTEX_DEBUG_INFO(mutex) (*((gpointer*)(((char*)mutex)+G_MUTEX_SIZE)))
typedef struct _ErrorCheckInfo ErrorCheckInfo;
struct _ErrorCheckInfo
{
gchar *name;
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 inline void
fill_info (ErrorCheckInfo *info,
GThread *self,
gulong magic,
gchar *name,
gchar *location)
{
info->owner = self;
if (magic == G_MUTEX_DEBUG_MAGIC)
{
/* We are used with special instrumented calls, where name and
* location is provided as well, so use them */
info->name = name;
info->location = location;
}
else
info->name = info->location = "unknown";
}
static void
g_mutex_lock_errorcheck_impl (GMutex *mutex,
gulong magic,
gchar *name,
gchar *location)
{
ErrorCheckInfo *info;
GThread *self = g_thread_self ();
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 anothe thread might mave
* locked 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 the mutex '%s' at '%s', "
"previously locked by name '%s' at '%s'",
name, location, info->name, info->location);
g_thread_functions_for_glib_use_default.mutex_lock (mutex);
fill_info (info, self, magic, name, location);
}
static gboolean
g_mutex_trylock_errorcheck_impl (GMutex *mutex,
gulong magic,
gchar *name,
gchar *location)
{
ErrorCheckInfo *info = G_MUTEX_DEBUG_INFO (mutex);
GThread *self = g_thread_self ();
if (!info)
{
/* This mutex has not yet been used, so simply lock and return TRUE */
g_mutex_lock_errorcheck_impl (mutex, magic, name, location);
return TRUE;
}
if (info->owner == self)
g_error ("Trying to recursivly lock the mutex '%s' at '%s', "
"previously locked by name '%s' at '%s'",
name, location, info->name, info->location);
if (!g_thread_functions_for_glib_use_default.mutex_trylock (mutex))
return FALSE;
fill_info (info, self, magic, name, location);
return TRUE;
}
static void
g_mutex_unlock_errorcheck_impl (GMutex *mutex,
gulong magic,
gchar *name,
gchar *location)
{
ErrorCheckInfo *info = G_MUTEX_DEBUG_INFO (mutex);
GThread *self = g_thread_self ();
if (magic != G_MUTEX_DEBUG_MAGIC)
name = location = "unknown";
if (!info || info->owner != self)
g_error ("Trying to unlock the unlocked mutex '%s' at '%s'",
name, location);
info->owner = NULL;
info->name = info->location = NULL;
g_thread_functions_for_glib_use_default.mutex_unlock (mutex);
}
static void
g_mutex_free_errorcheck_impl (GMutex *mutex)
{
g_free (G_MUTEX_DEBUG_INFO (mutex));
g_thread_functions_for_glib_use_default.mutex_free (mutex);
}
/* unshadow function declaration. See glib.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." );
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 = g_mutex_free_errorcheck_impl;
g_thread_init (&errorcheck_functions);
}
void
g_thread_init (GThreadFunctions* init)
{
gboolean supported;
#ifndef G_THREADS_ENABLED
g_error ("GLib thread support is disabled.");
#endif /* !G_THREADS_ENABLED */
if (thread_system_already_initialized)
g_error ("GThread system may only be initialized once.");
thread_system_already_initialized = TRUE;
if (init == NULL)
init = &g_thread_functions_for_glib_use_default;
else
g_thread_use_default_impl = FALSE;
#if defined (G_OS_WIN32) && defined (__GNUC__)
memcpy(&g_thread_functions_for_glib_use, init, sizeof (*init));
#else
g_thread_functions_for_glib_use = *init;
#endif
/* It is important, that g_threads_got_initialized is not set before the
* thread initialization functions of the different modules are called
*/
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_get);
/* 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.");
}
/* 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. */
#ifdef HAVE_G_THREAD_IMPL_INIT
if (g_thread_use_default_impl)
g_thread_impl_init();
#endif
/* now call the thread initialization functions of the different
* glib modules. order does matter, g_mutex_init MUST come first.
*/
g_mutex_init ();
g_mem_init ();
g_messages_init ();
/* now we can set g_threads_got_initialized and thus enable
* all the thread functions
*/
g_threads_got_initialized = TRUE;
/* we want the main thread to run with normal priority */
g_thread_set_priority (g_thread_self(), G_THREAD_PRIORITY_NORMAL);
}
static gint
g_thread_map_priority (GThreadPriority priority)
{
guint procent;
switch (priority)
{
case G_THREAD_PRIORITY_LOW: procent = 0; break;
default: case G_THREAD_PRIORITY_NORMAL: procent = 40; break;
case G_THREAD_PRIORITY_HIGH: procent = 80; break;
case G_THREAD_PRIORITY_URGENT: procent = 100; break;
}
return g_thread_min_priority +
(g_thread_max_priority - g_thread_min_priority) * procent / 100;
}