/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
- * gmutex.c: MT safety related functions
+ * gthread.c: MT safety related functions
* Copyright 1998 Sebastian Wilhelmi; University of Karlsruhe
* Owen Taylor
*
#include "config.h"
-#ifdef G_THREAD_USE_PID_SURROGATE
-#include <sys/types.h>
-#include <sys/time.h>
-#include <sys/resource.h>
-#include <errno.h>
-#endif /* G_THREAD_USE_PID_SURROGATE */
-
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <string.h>
#include "glib.h"
-
+#include "gthreadinit.h"
#if GLIB_SIZEOF_SYSTEM_THREAD == SIZEOF_VOID_P
# define g_system_thread_equal_simple(thread1, thread2) \
gpointer private_data;
gpointer retval;
GSystemThread system_thread;
-#ifdef G_THREAD_USE_PID_SURROGATE
- pid_t pid;
-#endif /* G_THREAD_USE_PID_SURROGATE */
};
-#ifdef G_THREAD_USE_PID_SURROGATE
-static gint priority_map[4];
-static gboolean prio_warned = FALSE;
-# define SET_PRIO(pid, prio) G_STMT_START{ \
- gint error = setpriority (PRIO_PROCESS, (pid), priority_map[prio]); \
- if (error == -1 && errno == EACCES && !prio_warned) \
- { \
- prio_warned = TRUE; \
- g_warning ("Priorities can only be increased by root."); \
- } \
- }G_STMT_END
-#endif /* G_THREAD_USE_PID_SURROGATE */
-
typedef struct _GStaticPrivateNode GStaticPrivateNode;
struct _GStaticPrivateNode
{
gboolean g_thread_use_default_impl = TRUE;
gboolean g_threads_got_initialized = FALSE;
-#if defined(G_PLATFORM_WIN32) && defined(__GNUC__)
-__declspec(dllexport)
-#endif
GThreadFunctions g_thread_functions_for_glib_use = {
(GMutex*(*)())g_thread_fail, /* mutex_new */
NULL, /* mutex_lock */
/* Local data */
-static GMutex *g_mutex_protect_static_mutex_allocation = NULL;
+static GMutex *g_once_mutex = NULL;
+static GCond *g_once_cond = NULL;
static GPrivate *g_thread_specific_private = NULL;
static GSList *g_thread_all_threads = NULL;
static GSList *g_thread_free_indeces = NULL;
G_LOCK_DEFINE_STATIC (g_thread);
+#ifdef G_THREADS_ENABLED
/* This must be called only once, before any threads are created.
* It will only be called from g_thread_init() in -lgthread.
*/
-void
-g_mutex_init (void)
+void
+g_thread_init_glib (void)
{
- GRealThread* main_thread;
-
/* We let the main thread (the one that calls g_thread_init) inherit
- * the data, that it set before calling g_thread_init
+ * the static_private data set before calling g_thread_init
*/
- main_thread = (GRealThread*) g_thread_self ();
+ GRealThread* main_thread = (GRealThread*) g_thread_self ();
+
+ g_once_mutex = g_mutex_new ();
+ g_once_cond = g_cond_new ();
+
+ _g_convert_thread_init ();
+ _g_rand_thread_init ();
+ _g_main_thread_init ();
+ _g_mem_thread_init ();
+ _g_messages_thread_init ();
+ _g_atomic_thread_init ();
+
+ g_threads_got_initialized = TRUE;
g_thread_specific_private = g_private_new (g_thread_cleanup);
- G_THREAD_UF (private_set, (g_thread_specific_private, main_thread));
+ g_private_set (g_thread_specific_private, main_thread);
G_THREAD_UF (thread_self, (&main_thread->system_thread));
- g_mutex_protect_static_mutex_allocation = g_mutex_new ();
+ _g_mem_thread_private_init ();
+ _g_messages_thread_private_init ();
-#ifdef G_THREAD_USE_PID_SURROGATE
- priority_map[G_THREAD_PRIORITY_NORMAL] =
- getpriority (PRIO_PROCESS, (getpid ()));
- priority_map[G_THREAD_PRIORITY_LOW] =
- MIN (20, priority_map[G_THREAD_PRIORITY_NORMAL] + 10);
- priority_map[G_THREAD_PRIORITY_HIGH] =
- MAX (-20, priority_map[G_THREAD_PRIORITY_NORMAL] - 10);
- priority_map[G_THREAD_PRIORITY_URGENT] =
- MAX (-20, priority_map[G_THREAD_PRIORITY_NORMAL] - 15);
-#endif /* G_THREAD_USE_PID_SURROGATE */
+}
+#endif /* G_THREADS_ENABLED */
+
+gpointer
+g_once_impl (GOnce *once,
+ GThreadFunc func,
+ gpointer arg)
+{
+ g_mutex_lock (g_once_mutex);
+
+ while (once->status == G_ONCE_STATUS_PROGRESS)
+ g_cond_wait (g_once_cond, g_once_mutex);
+
+ if (once->status != G_ONCE_STATUS_READY)
+ {
+ once->status = G_ONCE_STATUS_PROGRESS;
+ g_mutex_unlock (g_once_mutex);
+
+ once->retval = func (arg);
+
+ g_mutex_lock (g_once_mutex);
+ once->status = G_ONCE_STATUS_READY;
+ g_cond_broadcast (g_once_cond);
+ }
+
+ g_mutex_unlock (g_once_mutex);
+
+ return once->retval;
}
void
if (!g_thread_supported ())
return NULL;
- g_assert (g_mutex_protect_static_mutex_allocation);
+ g_assert (g_once_mutex);
- g_mutex_lock (g_mutex_protect_static_mutex_allocation);
+ g_mutex_lock (g_once_mutex);
if (!(*mutex))
- *mutex = g_mutex_new ();
+ {
+ GMutex *new_mutex = g_mutex_new ();
+
+ /* The following is a memory barrier to avoid the write
+ * to *new_mutex being reordered to after writing *mutex */
+ g_mutex_lock (new_mutex);
+ g_mutex_unlock (new_mutex);
+
+ *mutex = new_mutex;
+ }
- g_mutex_unlock (g_mutex_protect_static_mutex_allocation);
+ g_mutex_unlock (g_once_mutex);
return *mutex;
}
g_assert (data);
-#ifdef G_THREAD_USE_PID_SURROGATE
- thread->pid = getpid ();
-#endif /* G_THREAD_USE_PID_SURROGATE */
-
/* This has to happen before G_LOCK, as that might call g_thread_self */
g_private_set (g_thread_specific_private, data);
G_LOCK (g_thread);
G_UNLOCK (g_thread);
-#ifdef G_THREAD_USE_PID_SURROGATE
- if (g_thread_use_default_impl)
- SET_PRIO (thread->pid, thread->thread.priority);
-#endif /* G_THREAD_USE_PID_SURROGATE */
-
thread->retval = thread->thread.func (thread->thread.data);
return NULL;
thread->priority = priority;
-#ifdef G_THREAD_USE_PID_SURROGATE
- if (g_thread_use_default_impl)
- SET_PRIO (real->pid, priority);
- else
-#endif /* G_THREAD_USE_PID_SURROGATE */
- G_THREAD_CF (thread_set_priority, (void)0,
- (&real->system_thread, priority));
+ G_THREAD_CF (thread_set_priority, (void)0,
+ (&real->system_thread, priority));
}
GThread*
if (g_thread_supported ())
G_THREAD_UF (thread_self, (&thread->system_thread));
-#ifdef G_THREAD_USE_PID_SURROGATE
- thread->pid = getpid ();
-#endif /* G_THREAD_USE_PID_SURROGATE */
-
g_private_set (g_thread_specific_private, thread);
G_LOCK (g_thread);
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