1
/* GLIB - Library of useful routines for C programming
2
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
4
* gthread.c: MT safety related functions
5
* Copyright 1998 Sebastian Wilhelmi; University of Karlsruhe
8
* This library is free software; you can redistribute it and/or
9
* modify it under the terms of the GNU Lesser General Public
10
* License as published by the Free Software Foundation; either
11
* version 2 of the License, or (at your option) any later version.
13
* This library is distributed in the hope that it will be useful,
14
* but WITHOUT ANY WARRANTY; without even the implied warranty of
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
* Lesser General Public License for more details.
18
* You should have received a copy of the GNU Lesser General Public
19
* License along with this library; if not, write to the
20
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21
* Boston, MA 02111-1307, USA.
25
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
26
* file for a list of people on the GLib Team. See the ChangeLog
27
* files for a list of changes. These files are distributed with
28
* GLib at ftp://ftp.gtk.org/pub/gtk/.
38
#include "gthreadprivate.h"
49
#endif /* G_OS_WIN32 */
56
g_thread_error_quark (void)
58
return g_quark_from_static_string ("g_thread_error");
61
/* Keep this in sync with GRealThread in gmain.c! */
62
typedef struct _GRealThread GRealThread;
66
gpointer private_data;
69
GSystemThread system_thread;
72
typedef struct _GStaticPrivateNode GStaticPrivateNode;
73
struct _GStaticPrivateNode
76
GDestroyNotify destroy;
79
static void g_thread_cleanup (gpointer data);
80
static void g_thread_fail (void);
81
static guint64 gettime (void);
83
guint64 (*g_thread_gettime) (void) = gettime;
85
/* Global variables */
87
static GSystemThread zero_thread; /* This is initialized to all zero */
88
gboolean g_thread_use_default_impl = TRUE;
89
gboolean g_threads_got_initialized = FALSE;
91
GThreadFunctions g_thread_functions_for_glib_use = {
92
(GMutex*(*)())g_thread_fail, /* mutex_new */
93
NULL, /* mutex_lock */
94
NULL, /* mutex_trylock */
95
NULL, /* mutex_unlock */
96
NULL, /* mutex_free */
97
(GCond*(*)())g_thread_fail, /* cond_new */
98
NULL, /* cond_signal */
99
NULL, /* cond_broadcast */
100
NULL, /* cond_wait */
101
NULL, /* cond_timed_wait */
102
NULL, /* cond_free */
103
(GPrivate*(*)(GDestroyNotify))g_thread_fail, /* private_new */
104
NULL, /* private_get */
105
NULL, /* private_set */
106
(void(*)(GThreadFunc, gpointer, gulong,
107
gboolean, gboolean, GThreadPriority,
108
gpointer, GError**))g_thread_fail, /* thread_create */
109
NULL, /* thread_yield */
110
NULL, /* thread_join */
111
NULL, /* thread_exit */
112
NULL, /* thread_set_priority */
113
NULL, /* thread_self */
114
NULL /* thread_equal */
119
static GMutex *g_once_mutex = NULL;
120
static GCond *g_once_cond = NULL;
121
static GPrivate *g_thread_specific_private = NULL;
122
static GRealThread *g_thread_all_threads = NULL;
123
static GSList *g_thread_free_indeces = NULL;
125
G_LOCK_DEFINE_STATIC (g_thread);
127
#ifdef G_THREADS_ENABLED
128
/* This must be called only once, before any threads are created.
129
* It will only be called from g_thread_init() in -lgthread.
132
g_thread_init_glib (void)
134
/* We let the main thread (the one that calls g_thread_init) inherit
135
* the static_private data set before calling g_thread_init
137
GRealThread* main_thread = (GRealThread*) g_thread_self ();
139
/* mutex and cond creation works without g_threads_got_initialized */
140
g_once_mutex = g_mutex_new ();
141
g_once_cond = g_cond_new ();
143
/* we may only create mutex and cond in here */
144
_g_mem_thread_init_noprivate_nomessage ();
146
/* setup the basic threading system */
147
g_threads_got_initialized = TRUE;
148
g_thread_specific_private = g_private_new (g_thread_cleanup);
149
g_private_set (g_thread_specific_private, main_thread);
150
G_THREAD_UF (thread_self, (&main_thread->system_thread));
152
/* complete memory system initialization, g_private_*() works now */
153
_g_slice_thread_init_nomessage ();
155
/* accomplish log system initialization to enable messaging */
156
_g_messages_thread_init_nomessage ();
158
/* we may run full-fledged initializers from here */
159
_g_atomic_thread_init ();
160
_g_convert_thread_init ();
161
_g_rand_thread_init ();
162
_g_main_thread_init ();
163
_g_utils_thread_init ();
165
_g_win32_thread_init ();
168
#endif /* G_THREADS_ENABLED */
171
g_once_impl (GOnce *once,
175
g_mutex_lock (g_once_mutex);
177
while (once->status == G_ONCE_STATUS_PROGRESS)
178
g_cond_wait (g_once_cond, g_once_mutex);
180
if (once->status != G_ONCE_STATUS_READY)
182
once->status = G_ONCE_STATUS_PROGRESS;
183
g_mutex_unlock (g_once_mutex);
185
once->retval = func (arg);
187
g_mutex_lock (g_once_mutex);
188
once->status = G_ONCE_STATUS_READY;
189
g_cond_broadcast (g_once_cond);
192
g_mutex_unlock (g_once_mutex);
198
g_static_mutex_init (GStaticMutex *mutex)
200
static const GStaticMutex init_mutex = G_STATIC_MUTEX_INIT;
202
g_return_if_fail (mutex);
208
g_static_mutex_get_mutex_impl (GMutex** mutex)
210
if (!g_thread_supported ())
213
g_assert (g_once_mutex);
215
g_mutex_lock (g_once_mutex);
218
g_atomic_pointer_set (mutex, g_mutex_new());
220
g_mutex_unlock (g_once_mutex);
226
g_static_mutex_free (GStaticMutex* mutex)
228
GMutex **runtime_mutex;
230
g_return_if_fail (mutex);
232
/* The runtime_mutex is the first (or only) member of GStaticMutex,
233
* see both versions (of glibconfig.h) in configure.in */
234
runtime_mutex = ((GMutex**)mutex);
237
g_mutex_free (*runtime_mutex);
239
*runtime_mutex = NULL;
243
g_static_rec_mutex_init (GStaticRecMutex *mutex)
245
static const GStaticRecMutex init_mutex = G_STATIC_REC_MUTEX_INIT;
247
g_return_if_fail (mutex);
253
g_static_rec_mutex_lock (GStaticRecMutex* mutex)
257
g_return_if_fail (mutex);
259
if (!g_thread_supported ())
262
G_THREAD_UF (thread_self, (&self));
264
if (g_system_thread_equal (self, mutex->owner))
269
g_static_mutex_lock (&mutex->mutex);
270
g_system_thread_assign (mutex->owner, self);
275
g_static_rec_mutex_trylock (GStaticRecMutex* mutex)
279
g_return_val_if_fail (mutex, FALSE);
281
if (!g_thread_supported ())
284
G_THREAD_UF (thread_self, (&self));
286
if (g_system_thread_equal (self, mutex->owner))
292
if (!g_static_mutex_trylock (&mutex->mutex))
295
g_system_thread_assign (mutex->owner, self);
301
g_static_rec_mutex_unlock (GStaticRecMutex* mutex)
303
g_return_if_fail (mutex);
305
if (!g_thread_supported ())
308
if (mutex->depth > 1)
313
g_system_thread_assign (mutex->owner, zero_thread);
314
g_static_mutex_unlock (&mutex->mutex);
318
g_static_rec_mutex_lock_full (GStaticRecMutex *mutex,
322
g_return_if_fail (mutex);
324
if (!g_thread_supported ())
330
G_THREAD_UF (thread_self, (&self));
332
if (g_system_thread_equal (self, mutex->owner))
334
mutex->depth += depth;
337
g_static_mutex_lock (&mutex->mutex);
338
g_system_thread_assign (mutex->owner, self);
339
mutex->depth = depth;
343
g_static_rec_mutex_unlock_full (GStaticRecMutex *mutex)
347
g_return_val_if_fail (mutex, 0);
349
if (!g_thread_supported ())
352
depth = mutex->depth;
354
g_system_thread_assign (mutex->owner, zero_thread);
356
g_static_mutex_unlock (&mutex->mutex);
362
g_static_rec_mutex_free (GStaticRecMutex *mutex)
364
g_return_if_fail (mutex);
366
g_static_mutex_free (&mutex->mutex);
370
g_static_private_init (GStaticPrivate *private_key)
372
private_key->index = 0;
376
g_static_private_get (GStaticPrivate *private_key)
378
GRealThread *self = (GRealThread*) g_thread_self ();
381
array = self->private_data;
385
if (!private_key->index)
387
else if (private_key->index <= array->len)
388
return g_array_index (array, GStaticPrivateNode,
389
private_key->index - 1).data;
395
g_static_private_set (GStaticPrivate *private_key,
397
GDestroyNotify notify)
399
GRealThread *self = (GRealThread*) g_thread_self ();
401
static guint next_index = 0;
402
GStaticPrivateNode *node;
404
array = self->private_data;
407
array = g_array_new (FALSE, TRUE, sizeof (GStaticPrivateNode));
408
self->private_data = array;
411
if (!private_key->index)
415
if (!private_key->index)
417
if (g_thread_free_indeces)
420
GPOINTER_TO_UINT (g_thread_free_indeces->data);
421
g_thread_free_indeces =
422
g_slist_delete_link (g_thread_free_indeces,
423
g_thread_free_indeces);
426
private_key->index = ++next_index;
432
if (private_key->index > array->len)
433
g_array_set_size (array, private_key->index);
435
node = &g_array_index (array, GStaticPrivateNode, private_key->index - 1);
438
gpointer ddata = node->data;
439
GDestroyNotify ddestroy = node->destroy;
442
node->destroy = notify;
449
node->destroy = notify;
454
g_static_private_free (GStaticPrivate *private_key)
456
guint index = private_key->index;
462
private_key->index = 0;
466
thread = g_thread_all_threads;
469
GArray *array = thread->private_data;
470
thread = thread->next;
472
if (array && index <= array->len)
474
GStaticPrivateNode *node = &g_array_index (array,
477
gpointer ddata = node->data;
478
GDestroyNotify ddestroy = node->destroy;
481
node->destroy = NULL;
491
g_thread_free_indeces = g_slist_prepend (g_thread_free_indeces,
492
GUINT_TO_POINTER (index));
497
g_thread_cleanup (gpointer data)
501
GRealThread* thread = data;
502
if (thread->private_data)
504
GArray* array = thread->private_data;
507
for (i = 0; i < array->len; i++ )
509
GStaticPrivateNode *node =
510
&g_array_index (array, GStaticPrivateNode, i);
512
node->destroy (node->data);
514
g_array_free (array, TRUE);
517
/* We only free the thread structure, if it isn't joinable. If
518
it is, the structure is freed in g_thread_join */
519
if (!thread->thread.joinable)
524
for (t = g_thread_all_threads, p = NULL; t; p = t, t = t->next)
531
g_thread_all_threads = t->next;
537
/* Just to make sure, this isn't used any more */
538
g_system_thread_assign (thread->system_thread, zero_thread);
547
g_error ("The thread system is not yet initialized.");
550
#define G_NSEC_PER_SEC 1000000000
558
/* Returns 100s of nanoseconds since start of 1601 */
559
GetSystemTimeAsFileTime ((FILETIME *)&v);
561
/* Offset to Unix epoch */
562
v -= G_GINT64_CONSTANT (116444736000000000);
563
/* Convert to nanoseconds */
570
gettimeofday (&tv, NULL);
572
return (guint64) tv.tv_sec * G_NSEC_PER_SEC + tv.tv_usec * (G_NSEC_PER_SEC / G_USEC_PER_SEC);
577
g_thread_create_proxy (gpointer data)
579
GRealThread* thread = data;
583
/* This has to happen before G_LOCK, as that might call g_thread_self */
584
g_private_set (g_thread_specific_private, data);
586
/* the lock makes sure, that thread->system_thread is written,
587
before thread->thread.func is called. See g_thread_create. */
591
thread->retval = thread->thread.func (thread->thread.data);
597
g_thread_create_full (GThreadFunc func,
602
GThreadPriority priority,
606
GError *local_error = NULL;
607
g_return_val_if_fail (func, NULL);
608
g_return_val_if_fail (priority >= G_THREAD_PRIORITY_LOW, NULL);
609
g_return_val_if_fail (priority <= G_THREAD_PRIORITY_URGENT, NULL);
611
result = g_new0 (GRealThread, 1);
613
result->thread.joinable = joinable;
614
result->thread.priority = priority;
615
result->thread.func = func;
616
result->thread.data = data;
617
result->private_data = NULL;
619
G_THREAD_UF (thread_create, (g_thread_create_proxy, result,
620
stack_size, joinable, bound, priority,
621
&result->system_thread, &local_error));
622
result->next = g_thread_all_threads;
623
g_thread_all_threads = result;
628
g_propagate_error (error, local_error);
633
return (GThread*) result;
637
g_thread_exit (gpointer retval)
639
GRealThread* real = (GRealThread*) g_thread_self ();
640
real->retval = retval;
641
G_THREAD_CF (thread_exit, (void)0, ());
645
g_thread_join (GThread* thread)
647
GRealThread* real = (GRealThread*) thread;
651
g_return_val_if_fail (thread, NULL);
652
g_return_val_if_fail (thread->joinable, NULL);
653
g_return_val_if_fail (!g_system_thread_equal (real->system_thread,
656
G_THREAD_UF (thread_join, (&real->system_thread));
658
retval = real->retval;
661
for (t = g_thread_all_threads, p = NULL; t; p = t, t = t->next)
663
if (t == (GRealThread*) thread)
668
g_thread_all_threads = t->next;
674
/* Just to make sure, this isn't used any more */
675
thread->joinable = 0;
676
g_system_thread_assign (real->system_thread, zero_thread);
678
/* the thread structure for non-joinable threads is freed upon
679
thread end. We free the memory here. This will leave a loose end,
680
if a joinable thread is not joined. */
688
g_thread_set_priority (GThread* thread,
689
GThreadPriority priority)
691
GRealThread* real = (GRealThread*) thread;
693
g_return_if_fail (thread);
694
g_return_if_fail (!g_system_thread_equal (real->system_thread, zero_thread));
695
g_return_if_fail (priority >= G_THREAD_PRIORITY_LOW);
696
g_return_if_fail (priority <= G_THREAD_PRIORITY_URGENT);
698
thread->priority = priority;
700
G_THREAD_CF (thread_set_priority, (void)0,
701
(&real->system_thread, priority));
707
GRealThread* thread = g_private_get (g_thread_specific_private);
711
/* If no thread data is available, provide and set one. This
712
can happen for the main thread and for threads, that are not
714
thread = g_new0 (GRealThread, 1);
715
thread->thread.joinable = FALSE; /* This is a save guess */
716
thread->thread.priority = G_THREAD_PRIORITY_NORMAL; /* This is
718
thread->thread.func = NULL;
719
thread->thread.data = NULL;
720
thread->private_data = NULL;
722
if (g_thread_supported ())
723
G_THREAD_UF (thread_self, (&thread->system_thread));
725
g_private_set (g_thread_specific_private, thread);
728
thread->next = g_thread_all_threads;
729
g_thread_all_threads = thread;
733
return (GThread*)thread;
737
g_static_rw_lock_init (GStaticRWLock* lock)
739
static const GStaticRWLock init_lock = G_STATIC_RW_LOCK_INIT;
741
g_return_if_fail (lock);
747
g_static_rw_lock_wait (GCond** cond, GStaticMutex* mutex)
750
*cond = g_cond_new ();
751
g_cond_wait (*cond, g_static_mutex_get_mutex (mutex));
755
g_static_rw_lock_signal (GStaticRWLock* lock)
757
if (lock->want_to_write && lock->write_cond)
758
g_cond_signal (lock->write_cond);
759
else if (lock->want_to_read && lock->read_cond)
760
g_cond_broadcast (lock->read_cond);
764
g_static_rw_lock_reader_lock (GStaticRWLock* lock)
766
g_return_if_fail (lock);
768
if (!g_threads_got_initialized)
771
g_static_mutex_lock (&lock->mutex);
772
lock->want_to_read++;
773
while (lock->have_writer || lock->want_to_write)
774
g_static_rw_lock_wait (&lock->read_cond, &lock->mutex);
775
lock->want_to_read--;
776
lock->read_counter++;
777
g_static_mutex_unlock (&lock->mutex);
781
g_static_rw_lock_reader_trylock (GStaticRWLock* lock)
783
gboolean ret_val = FALSE;
785
g_return_val_if_fail (lock, FALSE);
787
if (!g_threads_got_initialized)
790
g_static_mutex_lock (&lock->mutex);
791
if (!lock->have_writer && !lock->want_to_write)
793
lock->read_counter++;
796
g_static_mutex_unlock (&lock->mutex);
801
g_static_rw_lock_reader_unlock (GStaticRWLock* lock)
803
g_return_if_fail (lock);
805
if (!g_threads_got_initialized)
808
g_static_mutex_lock (&lock->mutex);
809
lock->read_counter--;
810
if (lock->read_counter == 0)
811
g_static_rw_lock_signal (lock);
812
g_static_mutex_unlock (&lock->mutex);
816
g_static_rw_lock_writer_lock (GStaticRWLock* lock)
818
g_return_if_fail (lock);
820
if (!g_threads_got_initialized)
823
g_static_mutex_lock (&lock->mutex);
824
lock->want_to_write++;
825
while (lock->have_writer || lock->read_counter)
826
g_static_rw_lock_wait (&lock->write_cond, &lock->mutex);
827
lock->want_to_write--;
828
lock->have_writer = TRUE;
829
g_static_mutex_unlock (&lock->mutex);
833
g_static_rw_lock_writer_trylock (GStaticRWLock* lock)
835
gboolean ret_val = FALSE;
837
g_return_val_if_fail (lock, FALSE);
839
if (!g_threads_got_initialized)
842
g_static_mutex_lock (&lock->mutex);
843
if (!lock->have_writer && !lock->read_counter)
845
lock->have_writer = TRUE;
848
g_static_mutex_unlock (&lock->mutex);
853
g_static_rw_lock_writer_unlock (GStaticRWLock* lock)
855
g_return_if_fail (lock);
857
if (!g_threads_got_initialized)
860
g_static_mutex_lock (&lock->mutex);
861
lock->have_writer = FALSE;
862
g_static_rw_lock_signal (lock);
863
g_static_mutex_unlock (&lock->mutex);
867
g_static_rw_lock_free (GStaticRWLock* lock)
869
g_return_if_fail (lock);
873
g_cond_free (lock->read_cond);
874
lock->read_cond = NULL;
876
if (lock->write_cond)
878
g_cond_free (lock->write_cond);
879
lock->write_cond = NULL;
881
g_static_mutex_free (&lock->mutex);
886
* @thread_func: function to call for all GThread structures
887
* @user_data: second argument to @thread_func
889
* Call @thread_func on all existing #GThread structures. Note that
890
* threads may decide to exit while @thread_func is running, so
891
* without intimate knowledge about the lifetime of foreign threads,
892
* @thread_func shouldn't access the GThread* pointer passed in as
893
* first argument. However, @thread_func will not be called for threads
894
* which are known to have exited already.
896
* Due to thread lifetime checks, this function has an execution complexity
897
* which is quadratic in the number of existing threads.
902
g_thread_foreach (GFunc thread_func,
905
GSList *slist = NULL;
907
g_return_if_fail (thread_func != NULL);
908
/* snapshot the list of threads for iteration */
910
for (thread = g_thread_all_threads; thread; thread = thread->next)
911
slist = g_slist_prepend (slist, thread);
913
/* walk the list, skipping non-existant threads */
916
GSList *node = slist;
918
/* check whether the current thread still exists */
920
for (thread = g_thread_all_threads; thread; thread = thread->next)
921
if (thread == node->data)
925
thread_func (thread, user_data);
926
g_slist_free_1 (node);
930
#define __G_THREAD_C__
931
#include "galiasdef.c"
added
removed
glib/gthread.c
