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implemented g_once_init_enter(), g_once_init_enter_impl() and

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Tue Jul 10 12:24:35 2007  Tim Janik  <timj@imendio.com>

        * glib/gthread.[hc]: implemented g_once_init_enter(),
        g_once_init_enter_impl() and g_once_init_leave(), based on a patch by
        Antoine Tremblay, fixes #65041.
        adapted exported inline function mechanism from gutils.[hc] for inlining
        g_once_init_enter_impl() in gthread.[hc].



svn path=/trunk/; revision=5616
This commit is contained in:
Tim Janik 2007-07-10 10:30:36 +00:00 committed by Tim Janik
parent 1da3f1559c
commit c9ccc828f1
4 changed files with 70 additions and 2 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
Tue Jul 10 12:24:35 2007 Tim Janik <timj@imendio.com>
* glib/gthread.[hc]: implemented g_once_init_enter(),
g_once_init_enter_impl() and g_once_init_leave(), based on a patch by
Antoine Tremblay, fixes #65041.
adapted exported inline function mechanism from gutils.[hc] for inlining
g_once_init_enter_impl() in gthread.[hc].
2007-07-09 Matthias Clasen <mclasen@redhat.com>
* NEWS: Updates

3
glib/glib.symbols
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@ -1172,7 +1172,10 @@ g_str_hash
#if IN_HEADER(__G_THREAD_H__)
#if IN_FILE(__G_THREAD_C__)
g_once_impl
g_once_init_enter_impl
g_once_init_leave
#ifdef INCLUDE_INTERNAL_SYMBOLS
g_once_init_enter
g_thread_init_glib
#endif
#ifdef INCLUDE_VARIABLES

40
glib/gthread.c
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@ -32,6 +32,10 @@
* MT safe
*/
/* implement gthread.h's inline functions */
#define G_IMPLEMENT_INLINES 1
#define __G_THREAD_C__
#include "config.h"
#include "glib.h"
@ -121,6 +125,7 @@ static GCond *g_once_cond = NULL;
static GPrivate *g_thread_specific_private = NULL;
static GRealThread *g_thread_all_threads = NULL;
static GSList *g_thread_free_indeces = NULL;
static GSList* g_once_init_list = NULL;
G_LOCK_DEFINE_STATIC (g_thread);
@ -194,6 +199,41 @@ g_once_impl (GOnce *once,
return once->retval;
}
gboolean
g_once_init_enter_impl (volatile gsize *value_location)
{
gboolean need_init;
g_mutex_lock (g_once_mutex);
if (!g_once_init_list || !g_slist_find (g_once_init_list, (void*) value_location))
{
g_once_init_list = g_slist_prepend (g_once_init_list, (void*) value_location);
need_init = TRUE;
}
else
{
while (g_slist_find (g_once_init_list, (void*) value_location))
g_cond_wait (g_once_cond, g_once_mutex);
need_init = FALSE;
}
g_mutex_unlock (g_once_mutex);
return need_init;
}
void
g_once_init_leave (volatile gsize *value_location,
gsize initialization_value)
{
g_return_if_fail (g_atomic_pointer_get (value_location) == 0);
g_return_if_fail (initialization_value != 0);
g_return_if_fail (g_once_init_list != NULL);
g_atomic_pointer_set (value_location, initialization_value);
g_mutex_lock (g_once_mutex);
g_once_init_list = g_slist_remove (g_once_init_list, (void*) value_location);
g_cond_broadcast (g_once_cond);
g_mutex_unlock (g_once_mutex);
}
void
g_static_mutex_init (GStaticMutex *mutex)
{

21
glib/gthread.h
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@ -29,7 +29,8 @@
#include <glib/gerror.h>
#include <glib/gtypes.h>
#include <glib/gatomic.h> /* for g_atomic_pointer_get */
#include <glib/gutils.h> /* for G_INLINE_FUNC */
#include <glib/gatomic.h> /* for g_atomic_pointer_get */
G_BEGIN_DECLS
@ -321,7 +322,23 @@ gpointer g_once_impl (GOnce *once, GThreadFunc func, gpointer arg);
(once)->retval : \
g_once_impl ((once), (func), (arg)))
#endif /* G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */
/* initialize-once guards, keyed by value_location */
G_INLINE_FUNC gboolean g_once_init_enter (volatile gsize *value_location);
gboolean g_once_init_enter_impl (volatile gsize *value_location);
void g_once_init_leave (volatile gsize *value_location,
gsize initialization_value);
#if defined (G_CAN_INLINE) || defined (__G_THREAD_C__)
G_INLINE_FUNC gboolean
g_once_init_enter (volatile gsize *value_location)
{
if G_LIKELY (g_atomic_pointer_get (value_location) !=0)
return FALSE;
else
return g_once_init_enter_impl (value_location);
}
#endif /* G_CAN_INLINE || __G_THREAD_C__ */
/* these are some convenience macros that expand to nothing if GLib
* was configured with --disable-threads. for using StaticMutexes,
* you define them with G_LOCK_DEFINE_STATIC (name) or G_LOCK_DEFINE (name)