1 /* GLIB - Library of useful routines for C programming
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
4 * gthread.c: solaris thread system implementation
5 * Copyright 1998-2001 Sebastian Wilhelmi; University of Karlsruhe
6 * Copyright 2001 Hans Breuer
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/.
31 /* The GMutex and GCond implementations in this file are some of the
32 * lowest-level code in GLib. All other parts of GLib (messages,
33 * memory, slices, etc) assume that they can freely use these facilities
34 * without risking recursion.
36 * As such, these functions are NOT permitted to call any other part of
39 * The thread manipulation functions (create, exit, join, etc.) have
40 * more freedom -- they can do as they please.
46 #include "gthreadprivate.h"
56 g_thread_abort (gint status,
57 const gchar *function)
59 fprintf (stderr, "GLib (gthread-win32.c): Unexpected error from C library during '%s': %s. Aborting.\n",
60 strerror (status), function);
64 /* Starting with Vista and Windows 2008, we have access to the
65 * CONDITION_VARIABLE and SRWLock primatives on Windows, which are
66 * pretty reasonable approximations of the primatives specified in
67 * POSIX 2001 (pthread_cond_t and pthread_mutex_t respectively).
69 * Both of these types are structs containing a single pointer. That
70 * pointer is used as an atomic bitfield to support user-space mutexes
71 * that only get the kernel involved in cases of contention (similar
72 * to how futex()-based mutexes work on Linux). The biggest advantage
73 * of these new types is that they can be statically initialised to
74 * zero. That means that they are completely ABI compatible with our
75 * GMutex and GCond APIs.
77 * Unfortunately, Windows XP lacks these facilities and GLib still
78 * needs to support Windows XP. Our approach here is as follows:
80 * - avoid depending on structure declarations at compile-time by
81 * declaring our own GMutex and GCond strutures to be
82 * ABI-compatible with SRWLock and CONDITION_VARIABLE and using
85 * - avoid a hard dependency on the symbols used to manipulate these
86 * structures by doing a dynamic lookup of those symbols at
89 * - if the symbols are not available, emulate them using other
92 * Using this approach also allows us to easily build a GLib that lacks
93 * support for Windows XP or to remove this code entirely when XP is no
94 * longer supported (end of line is currently April 8, 2014).
98 void (__stdcall * CallThisOnThreadExit) (void); /* fake */
100 void (__stdcall * InitializeSRWLock) (gpointer lock);
101 void (__stdcall * DeleteSRWLock) (gpointer lock); /* fake */
102 void (__stdcall * AcquireSRWLockExclusive) (gpointer lock);
103 BOOLEAN (__stdcall * TryAcquireSRWLockExclusive) (gpointer lock);
104 void (__stdcall * ReleaseSRWLockExclusive) (gpointer lock);
105 void (__stdcall * AcquireSRWLockShared) (gpointer lock);
106 BOOLEAN (__stdcall * TryAcquireSRWLockShared) (gpointer lock);
107 void (__stdcall * ReleaseSRWLockShared) (gpointer lock);
109 void (__stdcall * InitializeConditionVariable) (gpointer cond);
110 void (__stdcall * DeleteConditionVariable) (gpointer cond); /* fake */
111 BOOL (__stdcall * SleepConditionVariableSRW) (gpointer cond,
115 void (__stdcall * WakeAllConditionVariable) (gpointer cond);
116 void (__stdcall * WakeConditionVariable) (gpointer cond);
119 static GThreadImplVtable g_thread_impl_vtable;
123 g_mutex_init (GMutex *mutex)
125 g_thread_impl_vtable.InitializeSRWLock (mutex);
129 g_mutex_clear (GMutex *mutex)
131 if (g_thread_impl_vtable.DeleteSRWLock != NULL)
132 g_thread_impl_vtable.DeleteSRWLock (mutex);
136 g_mutex_lock (GMutex *mutex)
138 g_thread_impl_vtable.AcquireSRWLockExclusive (mutex);
142 g_mutex_trylock (GMutex *mutex)
144 return g_thread_impl_vtable.TryAcquireSRWLockExclusive (mutex);
148 g_mutex_unlock (GMutex *mutex)
150 g_thread_impl_vtable.ReleaseSRWLockExclusive (mutex);
155 static CRITICAL_SECTION *
156 g_rec_mutex_impl_new (void)
158 CRITICAL_SECTION *cs;
160 cs = g_slice_new (CRITICAL_SECTION);
161 InitializeCriticalSection (cs);
167 g_rec_mutex_impl_free (CRITICAL_SECTION *cs)
169 DeleteCriticalSection (cs);
170 g_slice_free (CRITICAL_SECTION, cs);
173 static CRITICAL_SECTION *
174 g_rec_mutex_get_impl (GRecMutex *mutex)
176 CRITICAL_SECTION *impl = mutex->p;
178 if G_UNLIKELY (mutex->p == NULL)
180 impl = g_rec_mutex_impl_new ();
181 if (InterlockedCompareExchangePointer (&mutex->p, impl, NULL) != NULL)
182 g_rec_mutex_impl_free (impl);
190 g_rec_mutex_init (GRecMutex *mutex)
192 mutex->p = g_rec_mutex_impl_new ();
196 g_rec_mutex_clear (GRecMutex *mutex)
198 g_rec_mutex_impl_free (mutex->p);
202 g_rec_mutex_lock (GRecMutex *mutex)
204 EnterCriticalSection (g_rec_mutex_get_impl (mutex));
208 g_rec_mutex_unlock (GRecMutex *mutex)
210 LeaveCriticalSection (mutex->p);
214 g_rec_mutex_trylock (GRecMutex *mutex)
216 return TryEnterCriticalSection (g_rec_mutex_get_impl (mutex));
222 g_rw_lock_init (GRWLock *lock)
224 g_thread_impl_vtable.InitializeSRWLock (lock);
228 g_rw_lock_clear (GRWLock *lock)
230 if (g_thread_impl_vtable.DeleteSRWLock != NULL)
231 g_thread_impl_vtable.DeleteSRWLock (lock);
235 g_rw_lock_writer_lock (GRWLock *lock)
237 g_thread_impl_vtable.AcquireSRWLockExclusive (lock);
241 g_rw_lock_writer_trylock (GRWLock *lock)
243 return g_thread_impl_vtable.TryAcquireSRWLockExclusive (lock);
247 g_rw_lock_writer_unlock (GRWLock *lock)
249 g_thread_impl_vtable.ReleaseSRWLockExclusive (lock);
253 g_rw_lock_reader_lock (GRWLock *lock)
255 g_thread_impl_vtable.AcquireSRWLockShared (lock);
259 g_rw_lock_reader_trylock (GRWLock *lock)
261 return g_thread_impl_vtable.TryAcquireSRWLockShared (lock);
265 g_rw_lock_reader_unlock (GRWLock *lock)
267 g_thread_impl_vtable.ReleaseSRWLockShared (lock);
272 g_cond_init (GCond *cond)
274 g_thread_impl_vtable.InitializeConditionVariable (cond);
278 g_cond_clear (GCond *cond)
280 if (g_thread_impl_vtable.DeleteConditionVariable)
281 g_thread_impl_vtable.DeleteConditionVariable (cond);
285 g_cond_signal (GCond *cond)
287 g_thread_impl_vtable.WakeConditionVariable (cond);
291 g_cond_broadcast (GCond *cond)
293 g_thread_impl_vtable.WakeAllConditionVariable (cond);
297 g_cond_wait (GCond *cond,
298 GMutex *entered_mutex)
300 g_thread_impl_vtable.SleepConditionVariableSRW (cond, entered_mutex, INFINITE, 0);
304 g_cond_timedwait (GCond *cond,
305 GMutex *entered_mutex,
312 GetSystemTimeAsFileTime (&ft);
313 memmove (&now, &ft, sizeof (FILETIME));
315 now -= G_GINT64_CONSTANT (116444736000000000);
318 span = abs_time - now;
320 if G_UNLIKELY (span < 0)
323 if G_UNLIKELY (span > G_GINT64_CONSTANT (1000) * G_MAXINT32)
326 return g_thread_impl_vtable.SleepConditionVariableSRW (cond, entered_mutex, span / 1000, 0);
330 g_cond_timed_wait (GCond *cond,
331 GMutex *entered_mutex,
338 micros = abs_time->tv_sec;
340 micros += abs_time->tv_usec;
342 return g_cond_timedwait (cond, entered_mutex, micros);
346 g_cond_wait (cond, entered_mutex);
353 typedef struct _GPrivateDestructor GPrivateDestructor;
355 struct _GPrivateDestructor
358 GDestroyNotify notify;
359 GPrivateDestructor *next;
362 static GPrivateDestructor * volatile g_private_destructors;
363 static CRITICAL_SECTION g_private_lock;
366 g_private_get_impl (GPrivate *key)
368 DWORD impl = (DWORD) key->p;
370 if G_UNLIKELY (impl == 0)
372 EnterCriticalSection (&g_private_lock);
373 impl = (DWORD) key->p;
376 GPrivateDestructor *destructor;
380 if (impl == TLS_OUT_OF_INDEXES)
381 g_thread_abort (0, "TlsAlloc");
383 if (key->notify != NULL)
385 destructor = malloc (sizeof (GPrivateDestructor));
386 if G_UNLIKELY (destructor == NULL)
387 g_thread_abort (errno, "malloc");
388 destructor->index = impl;
389 destructor->notify = key->notify;
390 destructor->next = g_private_destructors;
392 /* We need to do an atomic store due to the unlocked
393 * access to the destructor list from the thread exit
396 * It can double as a sanity check...
398 if (InterlockedCompareExchangePointer (&g_private_destructors, destructor,
399 destructor->next) != destructor->next)
400 g_thread_abort (0, "g_private_get_impl(1)");
403 /* Ditto, due to the unlocked access on the fast path */
404 if (InterlockedCompareExchangePointer (&key->p, impl, NULL) != NULL)
405 g_thread_abort (0, "g_private_get_impl(2)");
407 LeaveCriticalSection (&g_private_lock);
414 g_private_get (GPrivate *key)
416 return TlsGetValue (g_private_get_impl (key));
420 g_private_set (GPrivate *key,
423 TlsSetValue (g_private_get_impl (key), value);
427 g_private_replace (GPrivate *key,
430 DWORD impl = g_private_get_impl (key);
433 old = TlsGetValue (impl);
434 if (old && key->notify)
436 TlsSetValue (impl, value);
442 #include "gthreadprivate.h"
444 #define win32_check_for_error(what) G_STMT_START{ \
446 g_error ("file %s: line %d (%s): error %s during %s", \
447 __FILE__, __LINE__, G_STRFUNC, \
448 g_win32_error_message (GetLastError ()), #what); \
451 #define G_MUTEX_SIZE (sizeof (gpointer))
453 static DWORD g_thread_self_tls;
455 typedef BOOL (__stdcall *GTryEnterCriticalSectionFunc) (CRITICAL_SECTION *);
457 typedef struct _GThreadData GThreadData;
467 g_system_thread_free (GRealThread *thread)
469 g_slice_free (GRealThread, thread);
473 g_system_thread_exit (void)
478 static guint __stdcall
479 g_thread_proxy (gpointer data)
481 GThreadData *self = (GThreadData*) data;
483 win32_check_for_error (TlsSetValue (g_thread_self_tls, self));
485 self->func (self->data);
487 g_system_thread_exit ();
489 g_assert_not_reached ();
495 g_system_thread_new (GThreadFunc func,
504 thread = g_slice_new0 (GRealThread);
505 retval = g_new(GThreadData, 1);
507 retval->data = thread;
509 retval->joinable = joinable;
511 retval->thread = (HANDLE) _beginthreadex (NULL, stack_size, g_thread_proxy,
514 if (retval->thread == NULL)
516 gchar *win_error = g_win32_error_message (GetLastError ());
517 g_set_error (error, G_THREAD_ERROR, G_THREAD_ERROR_AGAIN,
518 "Error creating thread: %s", win_error);
524 *(GThreadData **) &(thread->system_thread) = retval;
530 g_thread_yield (void)
536 g_system_thread_wait (GRealThread *thread)
538 GThreadData *target = *(GThreadData **)&(thread->system_thread);
540 g_return_if_fail (target->joinable);
542 win32_check_for_error (WAIT_FAILED !=
543 WaitForSingleObject (target->thread, INFINITE));
545 win32_check_for_error (CloseHandle (target->thread));
550 g_system_thread_set_name (const gchar *name)
552 /* FIXME: implement */
555 /* {{{1 SRWLock and CONDITION_VARIABLE emulation (for Windows XP) */
557 static CRITICAL_SECTION g_thread_xp_lock;
558 static DWORD g_thread_xp_waiter_tls;
560 /* {{{2 GThreadWaiter utility class for CONDITION_VARIABLE emulation */
561 typedef struct _GThreadXpWaiter GThreadXpWaiter;
562 struct _GThreadXpWaiter
565 volatile GThreadXpWaiter *next;
568 static GThreadXpWaiter *
569 g_thread_xp_waiter_get (void)
571 GThreadXpWaiter *waiter;
573 waiter = TlsGetValue (g_thread_xp_waiter_tls);
575 if G_UNLIKELY (waiter == NULL)
577 waiter = malloc (sizeof (GThreadXpWaiter));
579 g_thread_abort (GetLastError (), "malloc");
580 waiter->event = CreateEvent (0, FALSE, FALSE, NULL);
581 if (waiter->event == NULL)
582 g_thread_abort (GetLastError (), "CreateEvent");
584 TlsSetValue (g_thread_xp_waiter_tls, waiter);
590 static void __stdcall
591 g_thread_xp_CallThisOnThreadExit (void)
593 GThreadXpWaiter *waiter;
595 waiter = TlsGetValue (g_thread_xp_waiter_tls);
599 TlsSetValue (g_thread_xp_waiter_tls, NULL);
600 CloseHandle (waiter->event);
605 /* {{{2 SRWLock emulation */
608 CRITICAL_SECTION writer_lock;
609 gboolean ever_shared; /* protected by writer_lock */
610 gboolean writer_locked; /* protected by writer_lock */
612 /* below is only ever touched if ever_shared becomes true */
613 CRITICAL_SECTION atomicity;
614 GThreadXpWaiter *queued_writer; /* protected by atomicity lock */
615 gint num_readers; /* protected by atomicity lock */
618 static void __stdcall
619 g_thread_xp_InitializeSRWLock (gpointer mutex)
621 *(GThreadSRWLock * volatile *) mutex = NULL;
624 static void __stdcall
625 g_thread_xp_DeleteSRWLock (gpointer mutex)
627 GThreadSRWLock *lock = *(GThreadSRWLock * volatile *) mutex;
631 if (lock->ever_shared)
632 DeleteCriticalSection (&lock->atomicity);
634 DeleteCriticalSection (&lock->writer_lock);
639 static GThreadSRWLock * __stdcall
640 g_thread_xp_get_srwlock (GThreadSRWLock * volatile *lock)
642 GThreadSRWLock *result;
644 /* It looks like we're missing some barriers here, but this code only
645 * ever runs on Windows XP, which in turn only ever runs on hardware
646 * with a relatively rigid memory model. The 'volatile' will take
647 * care of the compiler.
651 if G_UNLIKELY (result == NULL)
653 EnterCriticalSection (&g_thread_xp_lock);
655 result = malloc (sizeof (GThreadSRWLock));
658 g_thread_abort (errno, "malloc");
660 InitializeCriticalSection (&result->writer_lock);
661 result->writer_locked = FALSE;
662 result->ever_shared = FALSE;
665 LeaveCriticalSection (&g_thread_xp_lock);
671 static void __stdcall
672 g_thread_xp_AcquireSRWLockExclusive (gpointer mutex)
674 GThreadSRWLock *lock = g_thread_xp_get_srwlock (mutex);
676 EnterCriticalSection (&lock->writer_lock);
678 /* CRITICAL_SECTION is reentrant, but SRWLock is not.
679 * Detect the deadlock that would occur on later Windows version.
681 g_assert (!lock->writer_locked);
682 lock->writer_locked = TRUE;
684 if (lock->ever_shared)
686 GThreadXpWaiter *waiter = NULL;
688 EnterCriticalSection (&lock->atomicity);
689 if (lock->num_readers > 0)
690 lock->queued_writer = waiter = g_thread_xp_waiter_get ();
691 LeaveCriticalSection (&lock->atomicity);
694 WaitForSingleObject (waiter->event, INFINITE);
696 lock->queued_writer = NULL;
700 static BOOLEAN __stdcall
701 g_thread_xp_TryAcquireSRWLockExclusive (gpointer mutex)
703 GThreadSRWLock *lock = g_thread_xp_get_srwlock (mutex);
705 if (!TryEnterCriticalSection (&lock->writer_lock))
708 /* CRITICAL_SECTION is reentrant, but SRWLock is not.
709 * Ensure that this properly returns FALSE (as SRWLock would).
711 if G_UNLIKELY (lock->writer_locked)
713 LeaveCriticalSection (&lock->writer_lock);
717 lock->writer_locked = TRUE;
719 if (lock->ever_shared)
723 EnterCriticalSection (&lock->atomicity);
724 available = lock->num_readers == 0;
725 LeaveCriticalSection (&lock->atomicity);
729 LeaveCriticalSection (&lock->writer_lock);
737 static void __stdcall
738 g_thread_xp_ReleaseSRWLockExclusive (gpointer mutex)
740 GThreadSRWLock *lock = *(GThreadSRWLock * volatile *) mutex;
742 lock->writer_locked = FALSE;
744 /* We need this until we fix some weird parts of GLib that try to
745 * unlock freshly-allocated mutexes.
748 LeaveCriticalSection (&lock->writer_lock);
752 g_thread_xp_srwlock_become_reader (GThreadSRWLock *lock)
754 if G_UNLIKELY (!lock->ever_shared)
756 InitializeCriticalSection (&lock->atomicity);
757 lock->queued_writer = NULL;
758 lock->num_readers = 0;
760 lock->ever_shared = TRUE;
763 EnterCriticalSection (&lock->atomicity);
765 LeaveCriticalSection (&lock->atomicity);
768 static void __stdcall
769 g_thread_xp_AcquireSRWLockShared (gpointer mutex)
771 GThreadSRWLock *lock = g_thread_xp_get_srwlock (mutex);
773 EnterCriticalSection (&lock->writer_lock);
775 /* See g_thread_xp_AcquireSRWLockExclusive */
776 g_assert (!lock->writer_locked);
778 g_thread_xp_srwlock_become_reader (lock);
780 LeaveCriticalSection (&lock->writer_lock);
783 static BOOLEAN __stdcall
784 g_thread_xp_TryAcquireSRWLockShared (gpointer mutex)
786 GThreadSRWLock *lock = g_thread_xp_get_srwlock (mutex);
788 if (!TryEnterCriticalSection (&lock->writer_lock))
791 /* See g_thread_xp_AcquireSRWLockExclusive */
792 if G_UNLIKELY (lock->writer_locked)
794 LeaveCriticalSection (&lock->writer_lock);
798 g_thread_xp_srwlock_become_reader (lock);
800 LeaveCriticalSection (&lock->writer_lock);
805 static void __stdcall
806 g_thread_xp_ReleaseSRWLockShared (gpointer mutex)
808 GThreadSRWLock *lock = g_thread_xp_get_srwlock (mutex);
810 EnterCriticalSection (&lock->atomicity);
814 if (lock->num_readers == 0 && lock->queued_writer)
815 SetEvent (lock->queued_writer->event);
817 LeaveCriticalSection (&lock->atomicity);
820 /* {{{2 CONDITION_VARIABLE emulation */
823 volatile GThreadXpWaiter *first;
824 volatile GThreadXpWaiter **last_ptr;
825 } GThreadXpCONDITION_VARIABLE;
827 static void __stdcall
828 g_thread_xp_InitializeConditionVariable (gpointer cond)
830 *(GThreadXpCONDITION_VARIABLE * volatile *) cond = NULL;
833 static void __stdcall
834 g_thread_xp_DeleteConditionVariable (gpointer cond)
836 GThreadXpCONDITION_VARIABLE *cv = *(GThreadXpCONDITION_VARIABLE * volatile *) cond;
842 static GThreadXpCONDITION_VARIABLE * __stdcall
843 g_thread_xp_get_condition_variable (GThreadXpCONDITION_VARIABLE * volatile *cond)
845 GThreadXpCONDITION_VARIABLE *result;
847 /* It looks like we're missing some barriers here, but this code only
848 * ever runs on Windows XP, which in turn only ever runs on hardware
849 * with a relatively rigid memory model. The 'volatile' will take
850 * care of the compiler.
854 if G_UNLIKELY (result == NULL)
856 result = malloc (sizeof (GThreadXpCONDITION_VARIABLE));
859 g_thread_abort (errno, "malloc");
861 result->first = NULL;
862 result->last_ptr = &result->first;
864 if (InterlockedCompareExchangePointer (cond, result, NULL) != NULL)
874 static BOOL __stdcall
875 g_thread_xp_SleepConditionVariableSRW (gpointer cond,
880 GThreadXpCONDITION_VARIABLE *cv = g_thread_xp_get_condition_variable (cond);
881 GThreadXpWaiter *waiter = g_thread_xp_waiter_get ();
886 EnterCriticalSection (&g_thread_xp_lock);
887 *cv->last_ptr = waiter;
888 cv->last_ptr = &waiter->next;
889 LeaveCriticalSection (&g_thread_xp_lock);
891 g_mutex_unlock (mutex);
892 status = WaitForSingleObject (waiter->event, timeout);
894 if (status != WAIT_TIMEOUT && status != WAIT_OBJECT_0)
895 g_thread_abort (GetLastError (), "WaitForSingleObject");
897 g_mutex_lock (mutex);
899 return status == WAIT_OBJECT_0;
902 static void __stdcall
903 g_thread_xp_WakeConditionVariable (gpointer cond)
905 GThreadXpCONDITION_VARIABLE *cv = g_thread_xp_get_condition_variable (cond);
906 volatile GThreadXpWaiter *waiter;
908 EnterCriticalSection (&g_thread_xp_lock);
912 cv->first = waiter->next;
913 if (cv->first == NULL)
914 cv->last_ptr = &cv->first;
916 LeaveCriticalSection (&g_thread_xp_lock);
919 SetEvent (waiter->event);
922 static void __stdcall
923 g_thread_xp_WakeAllConditionVariable (gpointer cond)
925 GThreadXpCONDITION_VARIABLE *cv = g_thread_xp_get_condition_variable (cond);
926 volatile GThreadXpWaiter *waiter;
928 EnterCriticalSection (&g_thread_xp_lock);
931 cv->last_ptr = &cv->first;
932 LeaveCriticalSection (&g_thread_xp_lock);
934 while (waiter != NULL)
936 volatile GThreadXpWaiter *next;
939 SetEvent (waiter->event);
946 g_thread_xp_init (void)
948 static const GThreadImplVtable g_thread_xp_impl_vtable = {
949 g_thread_xp_CallThisOnThreadExit,
950 g_thread_xp_InitializeSRWLock,
951 g_thread_xp_DeleteSRWLock,
952 g_thread_xp_AcquireSRWLockExclusive,
953 g_thread_xp_TryAcquireSRWLockExclusive,
954 g_thread_xp_ReleaseSRWLockExclusive,
955 g_thread_xp_AcquireSRWLockShared,
956 g_thread_xp_TryAcquireSRWLockShared,
957 g_thread_xp_ReleaseSRWLockShared,
958 g_thread_xp_InitializeConditionVariable,
959 g_thread_xp_DeleteConditionVariable,
960 g_thread_xp_SleepConditionVariableSRW,
961 g_thread_xp_WakeAllConditionVariable,
962 g_thread_xp_WakeConditionVariable
965 InitializeCriticalSection (&g_thread_xp_lock);
966 g_thread_xp_waiter_tls = TlsAlloc ();
968 g_thread_impl_vtable = g_thread_xp_impl_vtable;
974 g_thread_lookup_native_funcs (void)
976 GThreadImplVtable native_vtable = { 0, };
979 kernel32 = GetModuleHandle ("KERNEL32.DLL");
981 if (kernel32 == NULL)
984 #define GET_FUNC(name) if ((native_vtable.name = (void *) GetProcAddress (kernel32, #name)) == NULL) return FALSE
985 GET_FUNC(InitializeSRWLock);
986 GET_FUNC(AcquireSRWLockExclusive);
987 GET_FUNC(TryAcquireSRWLockExclusive);
988 GET_FUNC(ReleaseSRWLockExclusive);
989 GET_FUNC(AcquireSRWLockShared);
990 GET_FUNC(TryAcquireSRWLockShared);
991 GET_FUNC(ReleaseSRWLockShared);
993 GET_FUNC(InitializeConditionVariable);
994 GET_FUNC(SleepConditionVariableSRW);
995 GET_FUNC(WakeAllConditionVariable);
996 GET_FUNC(WakeConditionVariable);
999 g_thread_impl_vtable = native_vtable;
1004 G_GNUC_INTERNAL void
1005 g_thread_win32_init (void)
1007 if (g_thread_lookup_native_funcs ())
1008 fprintf (stderr, "(debug) GThread using native mode\n");
1011 fprintf (stderr, "(debug) GThread using Windows XP mode\n");
1012 g_thread_xp_init ();
1015 win32_check_for_error (TLS_OUT_OF_INDEXES != (g_thread_self_tls = TlsAlloc ()));
1016 InitializeCriticalSection (&g_private_lock);
1019 G_GNUC_INTERNAL void
1020 g_thread_win32_thread_detach (void)
1022 GThreadData *self = TlsGetValue (g_thread_self_tls);
1023 gboolean dtors_called;
1027 GPrivateDestructor *dtor;
1029 /* We go by the POSIX book on this one.
1031 * If we call a destructor then there is a chance that some new
1032 * TLS variables got set by code called in that destructor.
1034 * Loop until nothing is left.
1036 dtors_called = FALSE;
1038 for (dtor = g_private_destructors; dtor; dtor = dtor->next)
1042 value = TlsGetValue (dtor->index);
1043 if (value != NULL && dtor->notify != NULL)
1045 /* POSIX says to clear this before the call */
1046 TlsSetValue (dtor->index, NULL);
1047 dtor->notify (value);
1048 dtors_called = TRUE;
1052 while (dtors_called);
1056 if (!self->joinable)
1058 win32_check_for_error (CloseHandle (self->thread));
1061 win32_check_for_error (TlsSetValue (g_thread_self_tls, NULL));
1064 if (g_thread_impl_vtable.CallThisOnThreadExit)
1065 g_thread_impl_vtable.CallThisOnThreadExit ();
1068 /* vim:set foldmethod=marker: */