1 /* xbt_os_thread -- portability layer over the pthread API */
2 /* Used in RL to get win/lin portability, and in SG when CONTEXT_THREAD */
3 /* in SG, when using CONTEXT_UCONTEXT, xbt_os_thread_stub is used instead */
5 /* Copyright (c) 2007, 2008, 2009, 2010. The SimGrid Team.
6 * All rights reserved. */
8 /* This program is free software; you can redistribute it and/or modify it
9 * under the terms of the license (GNU LGPL) which comes with this package. */
11 #include "xbt/sysdep.h"
13 #include "xbt/ex_interface.h" /* We play crude games with exceptions */
15 #include "xbt/xbt_os_time.h" /* Portable time facilities */
16 #include "xbt/xbt_os_thread.h" /* This module */
17 #include "xbt_modinter.h" /* Initialization/finalization of this module */
19 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_sync_os, xbt,
20 "Synchronization mechanism (OS-level)");
22 /* ********************************* PTHREAD IMPLEMENTATION ************************************ */
26 #include <semaphore.h>
28 #ifdef HAVE_MUTEX_TIMEDLOCK
29 /* redefine the function header since we fail to get this from system headers on amd (at least) */
30 int pthread_mutex_timedlock(pthread_mutex_t * mutex,
31 const struct timespec *abs_timeout);
35 /* use named sempahore when sem_init() does not work */
37 static int next_sem_ID = 0;
38 static xbt_os_mutex_t next_sem_ID_lock;
41 typedef struct xbt_os_thread_ {
45 pvoid_f_pvoid_t start_routine;
48 static xbt_os_thread_t main_thread = NULL;
50 /* thread-specific data containing the xbt_os_thread_t structure */
51 static pthread_key_t xbt_self_thread_key;
52 static int thread_mod_inited = 0;
54 /* frees the xbt_os_thread_t corresponding to the current thread */
55 static void xbt_os_thread_free_thread_data(void *d)
60 /* callback: context fetching */
61 static ex_ctx_t *_os_thread_ex_ctx(void)
63 return xbt_os_thread_self()->exception;
66 /* callback: termination */
67 static void _os_thread_ex_terminate(xbt_ex_t * e)
72 /* FIXME: there should be a configuration variable to choose to kill everyone or only this one */
75 void xbt_os_thread_mod_init(void)
79 if (thread_mod_inited)
82 if ((errcode = pthread_key_create(&xbt_self_thread_key, NULL)))
83 THROW0(system_error, errcode,
84 "pthread_key_create failed for xbt_self_thread_key");
86 main_thread = xbt_new(s_xbt_os_thread_t, 1);
87 main_thread->name = (char *) "main";
88 main_thread->start_routine = NULL;
89 main_thread->param = NULL;
90 main_thread->exception = xbt_new(ex_ctx_t, 1);
91 XBT_CTX_INITIALIZE(main_thread->exception);
93 __xbt_ex_ctx = _os_thread_ex_ctx;
94 __xbt_ex_terminate = _os_thread_ex_terminate;
96 thread_mod_inited = 1;
99 next_sem_ID_lock = xbt_os_mutex_init();
104 void xbt_os_thread_mod_exit(void)
106 /* FIXME: don't try to free our key on shutdown.
107 Valgrind detects no leak if we don't, and whine if we try to */
110 // if ((errcode=pthread_key_delete(xbt_self_thread_key)))
111 // THROW0(system_error,errcode,"pthread_key_delete failed for xbt_self_thread_key");
112 free(main_thread->exception);
115 thread_mod_inited = 0;
116 #ifndef HAVE_SEM_WAIT
117 xbt_os_mutex_destroy(next_sem_ID_lock);
120 /* Restore the default exception setup */
121 __xbt_ex_ctx = &__xbt_ex_ctx_default;
122 __xbt_ex_terminate = &__xbt_ex_terminate_default;
125 static void *wrapper_start_routine(void *s)
127 xbt_os_thread_t t = s;
130 if ((errcode = pthread_setspecific(xbt_self_thread_key, t)))
131 THROW0(system_error, errcode,
132 "pthread_setspecific failed for xbt_self_thread_key");
134 return (*(t->start_routine)) (t->param);
137 xbt_os_thread_t xbt_os_thread_create(const char *name,
138 pvoid_f_pvoid_t start_routine,
143 xbt_os_thread_t res_thread = xbt_new(s_xbt_os_thread_t, 1);
144 res_thread->name = xbt_strdup(name);
145 res_thread->start_routine = start_routine;
146 res_thread->param = param;
147 res_thread->exception = xbt_new(ex_ctx_t, 1);
148 XBT_CTX_INITIALIZE(res_thread->exception);
150 if ((errcode = pthread_create(&(res_thread->t), NULL,
151 wrapper_start_routine, res_thread)))
152 THROW1(system_error, errcode,
153 "pthread_create failed: %s", strerror(errcode));
158 const char *xbt_os_thread_name(xbt_os_thread_t t)
163 const char *xbt_os_thread_self_name(void)
165 xbt_os_thread_t self = xbt_os_thread_self();
166 return self ? self->name : "main";
169 void xbt_os_thread_join(xbt_os_thread_t thread, void **thread_return)
174 if ((errcode = pthread_join(thread->t, thread_return)))
175 THROW1(system_error, errcode, "pthread_join failed: %s",
177 if (thread->exception)
178 free(thread->exception);
183 if (thread == main_thread) /* just killed main thread */
189 void xbt_os_thread_exit(int *retval)
191 pthread_exit(retval);
194 xbt_os_thread_t xbt_os_thread_self(void)
198 if (!thread_mod_inited)
201 res = pthread_getspecific(xbt_self_thread_key);
209 void xbt_os_thread_yield(void)
214 void xbt_os_thread_cancel(xbt_os_thread_t t)
216 pthread_cancel(t->t);
219 /****** mutex related functions ******/
220 typedef struct xbt_os_mutex_ {
221 /* KEEP IT IN SYNC WITH xbt_thread.c */
228 xbt_os_mutex_t xbt_os_mutex_init(void)
230 xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t, 1);
233 if ((errcode = pthread_mutex_init(&(res->m), NULL)))
234 THROW1(system_error, errcode, "pthread_mutex_init() failed: %s",
240 void xbt_os_mutex_acquire(xbt_os_mutex_t mutex)
244 if ((errcode = pthread_mutex_lock(&(mutex->m))))
245 THROW2(system_error, errcode, "pthread_mutex_lock(%p) failed: %s",
246 mutex, strerror(errcode));
250 void xbt_os_mutex_timedacquire(xbt_os_mutex_t mutex, double delay)
255 xbt_os_mutex_acquire(mutex);
257 } else if (delay == 0) {
258 errcode = pthread_mutex_trylock(&(mutex->m));
264 THROW1(timeout_error, 0, "mutex %p not ready", mutex);
266 THROW2(system_error, errcode, "xbt_mutex_timedacquire(%p) failed: %s",
267 mutex, strerror(errcode));
273 #ifdef HAVE_MUTEX_TIMEDLOCK
274 struct timespec ts_end;
275 double end = delay + xbt_os_time();
277 ts_end.tv_sec = (time_t) floor(end);
278 ts_end.tv_nsec = (long) ((end - ts_end.tv_sec) * 1000000000);
279 DEBUG2("pthread_mutex_timedlock(%p,%p)", &(mutex->m), &ts_end);
281 errcode = pthread_mutex_timedlock(&(mutex->m), &ts_end);
283 #else /* Well, let's reimplement it since those lazy libc dudes didn't */
284 double start = xbt_os_time();
286 errcode = pthread_mutex_trylock(&(mutex->m));
287 if (errcode == EBUSY)
288 xbt_os_thread_yield();
289 } while (errcode == EBUSY && xbt_os_time() - start < delay);
291 if (errcode == EBUSY)
294 #endif /* HAVE_MUTEX_TIMEDLOCK */
301 THROW2(timeout_error, delay,
302 "mutex %p wasn't signaled before timeout (%f)", mutex, delay);
305 THROW3(system_error, errcode,
306 "pthread_mutex_timedlock(%p,%f) failed: %s", mutex, delay,
312 void xbt_os_mutex_release(xbt_os_mutex_t mutex)
316 if ((errcode = pthread_mutex_unlock(&(mutex->m))))
317 THROW2(system_error, errcode, "pthread_mutex_unlock(%p) failed: %s",
318 mutex, strerror(errcode));
321 void xbt_os_mutex_destroy(xbt_os_mutex_t mutex)
328 if ((errcode = pthread_mutex_destroy(&(mutex->m))))
329 THROW2(system_error, errcode, "pthread_mutex_destroy(%p) failed: %s",
330 mutex, strerror(errcode));
334 /***** condition related functions *****/
335 typedef struct xbt_os_cond_ {
336 /* KEEP IT IN SYNC WITH xbt_thread.c */
340 xbt_os_cond_t xbt_os_cond_init(void)
342 xbt_os_cond_t res = xbt_new(s_xbt_os_cond_t, 1);
344 if ((errcode = pthread_cond_init(&(res->c), NULL)))
345 THROW1(system_error, errcode, "pthread_cond_init() failed: %s",
351 void xbt_os_cond_wait(xbt_os_cond_t cond, xbt_os_mutex_t mutex)
354 if ((errcode = pthread_cond_wait(&(cond->c), &(mutex->m))))
355 THROW3(system_error, errcode, "pthread_cond_wait(%p,%p) failed: %s",
356 cond, mutex, strerror(errcode));
360 void xbt_os_cond_timedwait(xbt_os_cond_t cond, xbt_os_mutex_t mutex,
364 struct timespec ts_end;
365 double end = delay + xbt_os_time();
368 xbt_os_cond_wait(cond, mutex);
370 ts_end.tv_sec = (time_t) floor(end);
371 ts_end.tv_nsec = (long) ((end - ts_end.tv_sec) * 1000000000);
372 DEBUG3("pthread_cond_timedwait(%p,%p,%p)", &(cond->c), &(mutex->m),
375 pthread_cond_timedwait(&(cond->c), &(mutex->m), &ts_end))) {
379 THROW3(timeout_error, errcode,
380 "condition %p (mutex %p) wasn't signaled before timeout (%f)",
383 THROW4(system_error, errcode,
384 "pthread_cond_timedwait(%p,%p,%f) failed: %s", cond, mutex,
385 delay, strerror(errcode));
390 void xbt_os_cond_signal(xbt_os_cond_t cond)
393 if ((errcode = pthread_cond_signal(&(cond->c))))
394 THROW2(system_error, errcode, "pthread_cond_signal(%p) failed: %s",
395 cond, strerror(errcode));
398 void xbt_os_cond_broadcast(xbt_os_cond_t cond)
401 if ((errcode = pthread_cond_broadcast(&(cond->c))))
402 THROW2(system_error, errcode, "pthread_cond_broadcast(%p) failed: %s",
403 cond, strerror(errcode));
406 void xbt_os_cond_destroy(xbt_os_cond_t cond)
413 if ((errcode = pthread_cond_destroy(&(cond->c))))
414 THROW2(system_error, errcode, "pthread_cond_destroy(%p) failed: %s",
415 cond, strerror(errcode));
419 void *xbt_os_thread_getparam(void)
421 xbt_os_thread_t t = xbt_os_thread_self();
422 return t ? t->param : NULL;
425 typedef struct xbt_os_sem_ {
426 #ifndef HAVE_SEM_INIT
434 #define SEM_FAILED (-1)
437 xbt_os_sem_t xbt_os_sem_init(unsigned int value)
439 xbt_os_sem_t res = xbt_new(s_xbt_os_sem_t, 1);
441 /* On some systems (MAC OS X), only the stub of sem_init is to be found.
442 * Any attempt to use it leads to ENOSYS (function not implemented).
443 * If such a prehistoric system is detected, do the job with sem_open instead
446 if (sem_init(&(res->s), 0, value) != 0)
447 THROW1(system_error, errno, "sem_init() failed: %s", strerror(errno));
450 #else /* damn, no sem_init(). Reimplement it */
452 xbt_os_mutex_acquire(next_sem_ID_lock);
453 res->name = bprintf("/%d.%d", (*xbt_getpid) (), ++next_sem_ID);
454 xbt_os_mutex_release(next_sem_ID_lock);
456 res->ps = sem_open(res->name, O_CREAT, 0644, value);
457 if ((res->ps == (sem_t *) SEM_FAILED) && (errno == ENAMETOOLONG)) {
458 /* Old darwins only allow 13 chars. Did you create *that* amount of semaphores? */
459 res->name[13] = '\0';
460 res->ps = sem_open(res->name, O_CREAT, 0644, 1);
462 if ((res->ps == (sem_t *) SEM_FAILED))
463 THROW1(system_error, errno, "sem_open() failed: %s", strerror(errno));
465 /* Remove the name from the semaphore namespace: we never join on it */
466 if (sem_unlink(res->name) < 0)
467 THROW1(system_error, errno, "sem_unlink() failed: %s", strerror(errno));
474 void xbt_os_sem_acquire(xbt_os_sem_t sem)
477 THROW0(arg_error, EINVAL, "Cannot acquire of the NULL semaphore");
478 if (sem_wait(sem->ps) < 0)
479 THROW1(system_error, errno, "sem_wait() failed: %s", strerror(errno));
482 void xbt_os_sem_timedacquire(xbt_os_sem_t sem, double delay)
487 THROW0(arg_error, EINVAL, "Cannot acquire of the NULL semaphore");
490 xbt_os_sem_acquire(sem);
491 } else if (delay == 0) {
492 errcode = sem_trywait(sem->ps);
498 THROW1(timeout_error, 0, "semaphore %p not ready", sem);
500 THROW2(system_error, errcode, "xbt_os_sem_timedacquire(%p) failed: %s",
501 sem, strerror(errcode));
506 struct timespec ts_end;
507 double end = delay + xbt_os_time();
509 ts_end.tv_sec = (time_t) floor(end);
510 ts_end.tv_nsec = (long) ((end - ts_end.tv_sec) * 1000000000);
511 DEBUG2("sem_timedwait(%p,%p)", sem->ps, &ts_end);
512 errcode = sem_timedwait(sem->s, &ts_end);
514 #else /* Okay, reimplement this function then */
515 double start = xbt_os_time();
517 errcode = sem_trywait(sem->ps);
518 if (errcode == EBUSY)
519 xbt_os_thread_yield();
520 } while (errcode == EBUSY && xbt_os_time() - start < delay);
522 if (errcode == EBUSY)
531 THROW2(timeout_error, delay,
532 "semaphore %p wasn't signaled before timeout (%f)", sem, delay);
535 THROW3(system_error, errcode, "sem_timedwait(%p,%f) failed: %s", sem,
536 delay, strerror(errcode));
541 void xbt_os_sem_release(xbt_os_sem_t sem)
544 THROW0(arg_error, EINVAL, "Cannot release of the NULL semaphore");
546 if (sem_post(sem->ps) < 0)
547 THROW1(system_error, errno, "sem_post() failed: %s", strerror(errno));
550 void xbt_os_sem_destroy(xbt_os_sem_t sem)
553 THROW0(arg_error, EINVAL, "Cannot destroy the NULL sempahore");
556 if (sem_destroy(sem->ps))
558 THROW1(system_error, errno, "sem_destroy() failed: %s",
561 if (sem_close(sem->ps) < 0)
562 THROW1(system_error, errno, "sem_close() failed: %s", strerror(errno));
569 void xbt_os_sem_get_value(xbt_os_sem_t sem, int *svalue)
572 THROW0(arg_error, EINVAL, "Cannot get the value of the NULL semaphore");
574 if (sem_getvalue(&(sem->s), svalue) < 0)
575 THROW1(system_error, errno, "sem_getvalue() failed: %s", strerror(errno));
578 /* ********************************* WINDOWS IMPLEMENTATION ************************************ */
584 typedef struct xbt_os_thread_ {
586 HANDLE handle; /* the win thread handle */
587 unsigned long id; /* the win thread id */
588 pvoid_f_pvoid_t start_routine;
592 /* so we can specify the size of the stack of the threads */
593 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
594 #define STACK_SIZE_PARAM_IS_A_RESERVATION 0x00010000
597 /* the default size of the stack of the threads (in bytes)*/
598 #define XBT_DEFAULT_THREAD_STACK_SIZE 4096
600 /* key to the TLS containing the xbt_os_thread_t structure */
601 static unsigned long xbt_self_thread_key;
603 void xbt_os_thread_mod_init(void)
605 xbt_self_thread_key = TlsAlloc();
608 void xbt_os_thread_mod_exit(void)
611 if (!TlsFree(xbt_self_thread_key))
612 THROW0(system_error, (int) GetLastError(),
613 "TlsFree() failed to cleanup the thread submodule");
616 static DWORD WINAPI wrapper_start_routine(void *s)
618 xbt_os_thread_t t = (xbt_os_thread_t) s;
621 if (!TlsSetValue(xbt_self_thread_key, t))
622 THROW0(system_error, (int) GetLastError(),
623 "TlsSetValue of data describing the created thread failed");
625 rv = (DWORD *) ((t->start_routine) (t->param));
632 xbt_os_thread_t xbt_os_thread_create(const char *name,
633 pvoid_f_pvoid_t start_routine,
637 xbt_os_thread_t t = xbt_new(s_xbt_os_thread_t, 1);
639 t->name = xbt_strdup(name);
640 t->start_routine = start_routine;
643 t->handle = CreateThread(NULL, XBT_DEFAULT_THREAD_STACK_SIZE,
644 (LPTHREAD_START_ROUTINE) wrapper_start_routine,
645 t, STACK_SIZE_PARAM_IS_A_RESERVATION, &(t->id));
649 THROW0(system_error, (int) GetLastError(), "CreateThread failed");
655 const char *xbt_os_thread_name(xbt_os_thread_t t)
660 const char *xbt_os_thread_self_name(void)
662 xbt_os_thread_t t = xbt_os_thread_self();
663 return t ? t->name : "main";
666 void xbt_os_thread_join(xbt_os_thread_t thread, void **thread_return)
669 if (WAIT_OBJECT_0 != WaitForSingleObject(thread->handle, INFINITE))
670 THROW0(system_error, (int) GetLastError(), "WaitForSingleObject failed");
674 if (!GetExitCodeThread(thread->handle, (DWORD *) (*thread_return)))
675 THROW0(system_error, (int) GetLastError(), "GetExitCodeThread failed");
678 CloseHandle(thread->handle);
686 void xbt_os_thread_exit(int *retval)
694 xbt_os_thread_t xbt_os_thread_self(void)
696 return TlsGetValue(xbt_self_thread_key);
699 void *xbt_os_thread_getparam(void)
701 xbt_os_thread_t t = xbt_os_thread_self();
706 void xbt_os_thread_yield(void)
711 void xbt_os_thread_cancel(xbt_os_thread_t t)
713 if (!TerminateThread(t->handle, 0))
714 THROW0(system_error, (int) GetLastError(), "TerminateThread failed");
717 /****** mutex related functions ******/
718 typedef struct xbt_os_mutex_ {
719 /* KEEP IT IN SYNC WITH xbt_thread.c */
720 CRITICAL_SECTION lock;
723 xbt_os_mutex_t xbt_os_mutex_init(void)
725 xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t, 1);
727 /* initialize the critical section object */
728 InitializeCriticalSection(&(res->lock));
733 void xbt_os_mutex_acquire(xbt_os_mutex_t mutex)
735 EnterCriticalSection(&mutex->lock);
738 void xbt_os_mutex_timedacquire(xbt_os_mutex_t mutex, double delay)
743 void xbt_os_mutex_release(xbt_os_mutex_t mutex)
746 LeaveCriticalSection(&mutex->lock);
750 void xbt_os_mutex_destroy(xbt_os_mutex_t mutex)
756 DeleteCriticalSection(&mutex->lock);
760 /***** condition related functions *****/
761 enum { /* KEEP IT IN SYNC WITH xbt_thread.c */
767 typedef struct xbt_os_cond_ {
768 /* KEEP IT IN SYNC WITH xbt_thread.c */
769 HANDLE events[MAX_EVENTS];
771 unsigned int waiters_count; /* the number of waiters */
772 CRITICAL_SECTION waiters_count_lock; /* protect access to waiters_count */
775 xbt_os_cond_t xbt_os_cond_init(void)
778 xbt_os_cond_t res = xbt_new0(s_xbt_os_cond_t, 1);
780 memset(&res->waiters_count_lock, 0, sizeof(CRITICAL_SECTION));
782 /* initialize the critical section object */
783 InitializeCriticalSection(&res->waiters_count_lock);
785 res->waiters_count = 0;
787 /* Create an auto-reset event */
788 res->events[SIGNAL] = CreateEvent(NULL, FALSE, FALSE, NULL);
790 if (!res->events[SIGNAL]) {
791 DeleteCriticalSection(&res->waiters_count_lock);
793 THROW0(system_error, 0, "CreateEvent failed for the signals");
796 /* Create a manual-reset event. */
797 res->events[BROADCAST] = CreateEvent(NULL, TRUE, FALSE, NULL);
799 if (!res->events[BROADCAST]) {
801 DeleteCriticalSection(&res->waiters_count_lock);
802 CloseHandle(res->events[SIGNAL]);
804 THROW0(system_error, 0, "CreateEvent failed for the broadcasts");
810 void xbt_os_cond_wait(xbt_os_cond_t cond, xbt_os_mutex_t mutex)
813 unsigned long wait_result;
816 /* lock the threads counter and increment it */
817 EnterCriticalSection(&cond->waiters_count_lock);
818 cond->waiters_count++;
819 LeaveCriticalSection(&cond->waiters_count_lock);
821 /* unlock the mutex associate with the condition */
822 LeaveCriticalSection(&mutex->lock);
824 /* wait for a signal (broadcast or no) */
825 wait_result = WaitForMultipleObjects(2, cond->events, FALSE, INFINITE);
827 if (wait_result == WAIT_FAILED)
828 THROW0(system_error, 0,
829 "WaitForMultipleObjects failed, so we cannot wait on the condition");
831 /* we have a signal lock the condition */
832 EnterCriticalSection(&cond->waiters_count_lock);
833 cond->waiters_count--;
835 /* it's the last waiter or it's a broadcast ? */
836 is_last_waiter = ((wait_result == WAIT_OBJECT_0 + BROADCAST - 1)
837 && (cond->waiters_count == 0));
839 LeaveCriticalSection(&cond->waiters_count_lock);
841 /* yes it's the last waiter or it's a broadcast
842 * only reset the manual event (the automatic event is reset in the WaitForMultipleObjects() function
846 if (!ResetEvent(cond->events[BROADCAST]))
847 THROW0(system_error, 0, "ResetEvent failed");
849 /* relock the mutex associated with the condition in accordance with the posix thread specification */
850 EnterCriticalSection(&mutex->lock);
853 void xbt_os_cond_timedwait(xbt_os_cond_t cond, xbt_os_mutex_t mutex,
857 unsigned long wait_result = WAIT_TIMEOUT;
859 unsigned long end = (unsigned long) (delay * 1000);
863 xbt_os_cond_wait(cond, mutex);
865 DEBUG3("xbt_cond_timedwait(%p,%p,%lu)", &(cond->events), &(mutex->lock),
868 /* lock the threads counter and increment it */
869 EnterCriticalSection(&cond->waiters_count_lock);
870 cond->waiters_count++;
871 LeaveCriticalSection(&cond->waiters_count_lock);
873 /* unlock the mutex associate with the condition */
874 LeaveCriticalSection(&mutex->lock);
875 /* wait for a signal (broadcast or no) */
877 wait_result = WaitForMultipleObjects(2, cond->events, FALSE, end);
879 switch (wait_result) {
881 THROW3(timeout_error, GetLastError(),
882 "condition %p (mutex %p) wasn't signaled before timeout (%f)",
885 THROW0(system_error, GetLastError(),
886 "WaitForMultipleObjects failed, so we cannot wait on the condition");
889 /* we have a signal lock the condition */
890 EnterCriticalSection(&cond->waiters_count_lock);
891 cond->waiters_count--;
893 /* it's the last waiter or it's a broadcast ? */
894 is_last_waiter = ((wait_result == WAIT_OBJECT_0 + BROADCAST - 1)
895 && (cond->waiters_count == 0));
897 LeaveCriticalSection(&cond->waiters_count_lock);
899 /* yes it's the last waiter or it's a broadcast
900 * only reset the manual event (the automatic event is reset in the WaitForMultipleObjects() function
904 if (!ResetEvent(cond->events[BROADCAST]))
905 THROW0(system_error, 0, "ResetEvent failed");
907 /* relock the mutex associated with the condition in accordance with the posix thread specification */
908 EnterCriticalSection(&mutex->lock);
910 /*THROW_UNIMPLEMENTED; */
913 void xbt_os_cond_signal(xbt_os_cond_t cond)
917 EnterCriticalSection(&cond->waiters_count_lock);
918 have_waiters = cond->waiters_count > 0;
919 LeaveCriticalSection(&cond->waiters_count_lock);
922 if (!SetEvent(cond->events[SIGNAL]))
923 THROW0(system_error, 0, "SetEvent failed");
925 xbt_os_thread_yield();
928 void xbt_os_cond_broadcast(xbt_os_cond_t cond)
932 EnterCriticalSection(&cond->waiters_count_lock);
933 have_waiters = cond->waiters_count > 0;
934 LeaveCriticalSection(&cond->waiters_count_lock);
937 SetEvent(cond->events[BROADCAST]);
940 void xbt_os_cond_destroy(xbt_os_cond_t cond)
947 if (!CloseHandle(cond->events[SIGNAL]))
950 if (!CloseHandle(cond->events[BROADCAST]))
953 DeleteCriticalSection(&cond->waiters_count_lock);
958 THROW0(system_error, 0, "Error while destroying the condition");
961 typedef struct xbt_os_sem_ {
964 CRITICAL_SECTION value_lock; /* protect access to value of the semaphore */
968 # define INT_MAX 32767 /* let's be safe by underestimating this value: this is for 16bits only */
971 xbt_os_sem_t xbt_os_sem_init(unsigned int value)
976 THROW1(arg_error, value,
977 "Semaphore initial value too big: %ud cannot be stored as a signed int",
980 res = (xbt_os_sem_t) xbt_new0(s_xbt_os_sem_t, 1);
982 if (!(res->h = CreateSemaphore(NULL, value, (long) INT_MAX, NULL))) {
983 THROW1(system_error, GetLastError(), "CreateSemaphore() failed: %s",
984 strerror(GetLastError()));
990 InitializeCriticalSection(&(res->value_lock));
995 void xbt_os_sem_acquire(xbt_os_sem_t sem)
998 THROW0(arg_error, EINVAL, "Cannot acquire the NULL semaphore");
1001 if (WAIT_OBJECT_0 != WaitForSingleObject(sem->h, INFINITE))
1002 THROW1(system_error, GetLastError(), "WaitForSingleObject() failed: %s",
1003 strerror(GetLastError()));
1004 EnterCriticalSection(&(sem->value_lock));
1006 LeaveCriticalSection(&(sem->value_lock));
1009 void xbt_os_sem_timedacquire(xbt_os_sem_t sem, double timeout)
1013 double end = timeout + xbt_os_time();
1016 THROW0(arg_error, EINVAL, "Cannot acquire the NULL semaphore");
1019 xbt_os_sem_acquire(sem);
1020 } else { /* timeout can be zero <-> try acquire ) */
1023 seconds = (long) floor(end);
1024 milliseconds = (long) ((end - seconds) * 1000);
1025 milliseconds += (seconds * 1000);
1027 switch (WaitForSingleObject(sem->h, milliseconds)) {
1029 EnterCriticalSection(&(sem->value_lock));
1031 LeaveCriticalSection(&(sem->value_lock));
1035 THROW2(timeout_error, GetLastError(),
1036 "semaphore %p wasn't signaled before timeout (%f)", sem,
1041 THROW3(system_error, GetLastError(),
1042 "WaitForSingleObject(%p,%f) failed: %s", sem, timeout,
1043 strerror(GetLastError()));
1048 void xbt_os_sem_release(xbt_os_sem_t sem)
1051 THROW0(arg_error, EINVAL, "Cannot release the NULL semaphore");
1053 if (!ReleaseSemaphore(sem->h, 1, NULL))
1054 THROW1(system_error, GetLastError(), "ReleaseSemaphore() failed: %s",
1055 strerror(GetLastError()));
1056 EnterCriticalSection(&(sem->value_lock));
1058 LeaveCriticalSection(&(sem->value_lock));
1061 void xbt_os_sem_destroy(xbt_os_sem_t sem)
1064 THROW0(arg_error, EINVAL, "Cannot destroy the NULL semaphore");
1066 if (!CloseHandle(sem->h))
1067 THROW1(system_error, GetLastError(), "CloseHandle() failed: %s",
1068 strerror(GetLastError()));
1070 DeleteCriticalSection(&(sem->value_lock));
1076 void xbt_os_sem_get_value(xbt_os_sem_t sem, int *svalue)
1079 THROW0(arg_error, EINVAL, "Cannot get the value of the NULL semaphore");
1081 EnterCriticalSection(&(sem->value_lock));
1082 *svalue = sem->value;
1083 LeaveCriticalSection(&(sem->value_lock));