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Make the magic and location arguments to the error-checking-mutex

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2006-05-10  Sebastian Wilhelmi  <wilhelmi@google.com>

	* glib/gthread.h, gthread/gthread-impl.c: Make the magic and
	location arguments to the error-checking-mutex functions const and
	do not write to them, as we might not own them. Clean up the
	error-checking-mutex code quite a bit. (#335198, Chris Wilson)
This commit is contained in:
Sebastian Wilhelmi 2006-05-11 00:18:46 +00:00 committed by Sebastian Wilhelmi
parent a93560b83d
commit 268084caf9
4 changed files with 110 additions and 133 deletions
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5
ChangeLog
View File

@ -1,5 +1,10 @@
2006-05-10 Sebastian Wilhelmi <wilhelmi@google.com>
* glib/gthread.h, gthread/gthread-impl.c: Make the magic and
location arguments to the error-checking-mutex functions const and
do not write to them, as we might not own them. Clean up the
error-checking-mutex code quite a bit. (#335198, Chris Wilson)
* glib/gthread.c: Use g_atomic_pointer_set instead of old
homegrown version now that we have it. (#335198, Chris Wilson)

5
ChangeLog.pre-2-12
View File

@ -1,5 +1,10 @@
2006-05-10 Sebastian Wilhelmi <wilhelmi@google.com>
* glib/gthread.h, gthread/gthread-impl.c: Make the magic and
location arguments to the error-checking-mutex functions const and
do not write to them, as we might not own them. Clean up the
error-checking-mutex code quite a bit. (#335198, Chris Wilson)
* glib/gthread.c: Use g_atomic_pointer_set instead of old
homegrown version now that we have it. (#335198, Chris Wilson)

4
glib/gthread.h
View File

@ -148,7 +148,8 @@ GMutex* g_static_mutex_get_mutex_impl (GMutex **mutex);
#define G_THREAD_CF(op, fail, arg) \
(g_thread_supported () ? G_THREAD_UF (op, arg) : (fail))
#define G_THREAD_ECF(op, fail, mutex, type) \
(g_thread_supported () ? ((type(*)(GMutex*, gulong, gchar*)) \
(g_thread_supported () ? \
((type(*)(GMutex*, const gulong, gchar const*)) \
(*g_thread_functions_for_glib_use . op)) \
(mutex, G_MUTEX_DEBUG_MAGIC, G_STRLOC) : (fail))
@ -374,4 +375,3 @@ extern void glib_dummy_decl (void);
G_END_DECLS
#endif /* __G_THREAD_H__ */

229
gthread/gthread-impl.c
View File

@ -24,10 +24,10 @@
* 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/.
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
/*
/*
* MT safe
*/
@ -69,119 +69,95 @@ 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
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 ();
retval = g_realloc (retval, G_MUTEX_SIZE + sizeof (gpointer));
G_MUTEX_DEBUG_INFO (retval) = NULL;
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,
gulong magic,
gchar *location)
g_mutex_lock_errorcheck_impl (GMutex *mutex,
const gulong magic,
gchar * const location)
{
ErrorCheckInfo *info;
GSystemThread self;
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 (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 (g_system_thread_equal (info->owner, self))
g_error ("Trying to recursivly lock a mutex at '%s', "
"previously locked at '%s'",
location, info->location);
"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 = location;
info->location = loc;
}
static gboolean
g_mutex_trylock_errorcheck_impl (GMutex *mutex,
gulong magic,
gchar *location)
g_mutex_trylock_errorcheck_impl (GMutex *mutex,
const gulong magic,
gchar * const location)
{
ErrorCheckInfo *info = G_MUTEX_DEBUG_INFO (mutex);
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 (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 (g_system_thread_equal (info->owner, self))
g_error ("Trying to recursivly lock a mutex at '%s', "
"previously locked at '%s'",
location, info->location);
"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 = location;
info->location = loc;
return TRUE;
}
static void
g_mutex_unlock_errorcheck_impl (GMutex *mutex,
gulong magic,
gchar *location)
g_mutex_unlock_errorcheck_impl (GMutex *mutex,
const gulong magic,
gchar * const location)
{
ErrorCheckInfo *info = G_MUTEX_DEBUG_INFO (mutex);
GSystemThread self;
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 (magic != G_MUTEX_DEBUG_MAGIC)
location = "unknown";
if (!info || g_system_thread_equal (info->owner, zero_thread))
g_error ("Trying to unlock an unlocked mutex at '%s'", location);
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'",
location, info->location);
loc, info->location);
g_system_thread_assign (info->owner, zero_thread);
info->location = NULL;
@ -190,90 +166,81 @@ g_mutex_unlock_errorcheck_impl (GMutex *mutex,
}
static void
g_mutex_free_errorcheck_impl (GMutex *mutex,
gulong magic,
gchar *location)
g_mutex_free_errorcheck_impl (GMutex *mutex,
const gulong magic,
gchar * const location)
{
ErrorCheckInfo *info = G_MUTEX_DEBUG_INFO (mutex);
if (magic != G_MUTEX_DEBUG_MAGIC)
location = "unknown";
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'",
location, info->location);
"which was previously locked at '%s'",
loc, info->location);
g_free (G_MUTEX_DEBUG_INFO (mutex));
g_thread_functions_for_glib_use_default.mutex_free (mutex);
g_thread_functions_for_glib_use_default.mutex_free (mutex);
}
static void
static void
g_cond_wait_errorcheck_impl (GCond *cond,
GMutex *mutex,
gulong magic,
gchar *location)
GMutex *mutex,
const gulong magic,
gchar * const location)
{
ErrorCheckInfo *info = G_MUTEX_DEBUG_INFO (mutex);
GSystemThread self;
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 (magic != G_MUTEX_DEBUG_MAGIC)
location = "unknown";
if (!info || g_system_thread_equal (info->owner, zero_thread))
g_error ("Trying to use an unlocked mutex in g_cond_wait() at '%s'",
location);
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'", location);
"g_cond_wait() at '%s'", loc);
g_system_thread_assign (info->owner, zero_thread);
location = info->location;
loc = info->location;
g_thread_functions_for_glib_use_default.cond_wait (cond, mutex);
g_system_thread_assign (info->owner, self);
info->location = location;
info->location = loc;
}
static gboolean
static gboolean
g_cond_timed_wait_errorcheck_impl (GCond *cond,
GMutex *mutex,
GTimeVal *end_time,
gulong magic,
gchar *location)
GTimeVal *end_time,
const gulong magic,
gchar * const location)
{
ErrorCheckInfo *info = G_MUTEX_DEBUG_INFO (mutex);
GSystemThread self;
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 (magic != G_MUTEX_DEBUG_MAGIC)
location = "unknown";
if (!info || g_system_thread_equal (info->owner, zero_thread))
if (g_system_thread_equal (info->owner, zero_thread))
g_error ("Trying to use an unlocked mutex in g_cond_timed_wait() at '%s'",
location);
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'", location);
"g_cond_timed_wait() at '%s'", loc);
g_system_thread_assign (info->owner, zero_thread);
location = info->location;
retval = g_thread_functions_for_glib_use_default.cond_timed_wait (cond,
mutex,
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 = location;
info->location = loc;
return retval;
}
@ -282,12 +249,12 @@ g_cond_timed_wait_errorcheck_impl (GCond *cond,
/* unshadow function declaration. See gthread.h */
#undef g_thread_init
void
void
g_thread_init_with_errorcheck_mutexes (GThreadFunctions* init)
{
GThreadFunctions errorcheck_functions;
if (init)
g_error ("Errorcheck mutexes can only be used for native "
g_error ("Errorcheck mutexes can only be used for native "
"thread implementations. Sorry." );
#ifdef HAVE_G_THREAD_IMPL_INIT
@ -304,20 +271,20 @@ g_thread_init_with_errorcheck_mutexes (GThreadFunctions* init)
errorcheck_functions = g_thread_functions_for_glib_use_default;
errorcheck_functions.mutex_new = g_mutex_new_errorcheck_impl;
errorcheck_functions.mutex_lock =
errorcheck_functions.mutex_lock =
(void (*)(GMutex *)) g_mutex_lock_errorcheck_impl;
errorcheck_functions.mutex_trylock =
errorcheck_functions.mutex_trylock =
(gboolean (*)(GMutex *)) g_mutex_trylock_errorcheck_impl;
errorcheck_functions.mutex_unlock =
errorcheck_functions.mutex_unlock =
(void (*)(GMutex *)) g_mutex_unlock_errorcheck_impl;
errorcheck_functions.mutex_free =
errorcheck_functions.mutex_free =
(void (*)(GMutex *)) g_mutex_free_errorcheck_impl;
errorcheck_functions.cond_wait =
errorcheck_functions.cond_wait =
(void (*)(GCond *, GMutex *)) g_cond_wait_errorcheck_impl;
errorcheck_functions.cond_timed_wait =
(gboolean (*)(GCond *, GMutex *, GTimeVal *))
errorcheck_functions.cond_timed_wait =
(gboolean (*)(GCond *, GMutex *, GTimeVal *))
g_cond_timed_wait_errorcheck_impl;
g_thread_init (&errorcheck_functions);
}
@ -328,7 +295,7 @@ g_thread_init (GThreadFunctions* init)
if (thread_system_already_initialized)
g_error ("GThread system may only be initialized once.");
thread_system_already_initialized = TRUE;
if (init == NULL)
@ -346,15 +313,15 @@ g_thread_init (GThreadFunctions* init)
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 &&
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 &&