3 /* xbt_os_thread -- portability layer over the pthread API */
4 /* Used in RL to get win/lin portability, and in SG when CONTEXT_THREAD */
5 /* in SG, when using CONTEXT_UCONTEXT, xbt_os_thread_stub is used instead */
7 /* Copyright 2006,2007 Malek Cherier, Martin Quinson
8 * All right reserved. */
10 /* This program is free software; you can redistribute it and/or modify it
11 * under the terms of the license (GNU LGPL) which comes with this package. */
13 #include "xbt/sysdep.h"
15 #include "xbt/ex_interface.h" /* We play crude games with exceptions */
17 #include "xbt/xbt_os_time.h" /* Portable time facilities */
18 #include "xbt/xbt_os_thread.h" /* This module */
19 #include "xbt_modinter.h" /* Initialization/finalization of this module */
21 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_sync_os,xbt,"Synchronization mechanism (OS-level)");
23 /* ********************************* PTHREAD IMPLEMENTATION ************************************ */
27 #include <semaphore.h>
29 #ifdef HAVE_MUTEX_TIMEDLOCK
30 /* redefine the function header since we fail to get this from system headers on amd (at least) */
31 int pthread_mutex_timedlock(pthread_mutex_t *mutex,
32 const struct timespec *abs_timeout);
36 /* use named sempahore when sem_init() does not work */
38 static int next_sem_ID = 0;
39 static xbt_os_mutex_t next_sem_ID_lock;
42 typedef struct xbt_os_thread_ {
46 pvoid_f_pvoid_t start_routine;
49 static xbt_os_thread_t main_thread = NULL;
51 /* thread-specific data containing the xbt_os_thread_t structure */
52 static pthread_key_t xbt_self_thread_key;
53 static int thread_mod_inited = 0;
55 /* frees the xbt_os_thread_t corresponding to the current thread */
56 static void xbt_os_thread_free_thread_data(void*d){
60 /* callback: context fetching */
61 static ex_ctx_t *_os_thread_ex_ctx(void) {
62 return xbt_os_thread_self()->exception;
65 /* callback: termination */
66 static void _os_thread_ex_terminate(xbt_ex_t * e) {
70 /* FIXME: there should be a configuration variable to choose to kill everyone or only this one */
73 void xbt_os_thread_mod_init(void) {
76 if (thread_mod_inited)
79 if ((errcode=pthread_key_create(&xbt_self_thread_key, NULL)))
80 THROW0(system_error,errcode,"pthread_key_create failed for xbt_self_thread_key");
82 main_thread=xbt_new(s_xbt_os_thread_t,1);
83 main_thread->name = (char*)"main";
84 main_thread->start_routine = NULL;
85 main_thread->param = NULL;
86 main_thread->exception = xbt_new(ex_ctx_t, 1);
87 XBT_CTX_INITIALIZE(main_thread->exception);
89 __xbt_ex_ctx = _os_thread_ex_ctx;
90 __xbt_ex_terminate = _os_thread_ex_terminate;
92 thread_mod_inited = 1;
95 next_sem_ID_lock = xbt_os_mutex_init();
99 void xbt_os_thread_mod_exit(void) {
100 /* FIXME: don't try to free our key on shutdown.
101 Valgrind detects no leak if we don't, and whine if we try to */
104 // if ((errcode=pthread_key_delete(xbt_self_thread_key)))
105 // THROW0(system_error,errcode,"pthread_key_delete failed for xbt_self_thread_key");
108 static void * wrapper_start_routine(void *s) {
109 xbt_os_thread_t t = s;
112 if ((errcode=pthread_setspecific(xbt_self_thread_key,t)))
113 THROW0(system_error,errcode,
114 "pthread_setspecific failed for xbt_self_thread_key");
116 return (*(t->start_routine))(t->param);
119 xbt_os_thread_t xbt_os_thread_create(const char*name,
120 pvoid_f_pvoid_t start_routine,
124 xbt_os_thread_t res_thread=xbt_new(s_xbt_os_thread_t,1);
125 res_thread->name = xbt_strdup(name);
126 res_thread->start_routine = start_routine;
127 res_thread->param = param;
128 res_thread->exception = xbt_new(ex_ctx_t, 1);
129 XBT_CTX_INITIALIZE(res_thread->exception);
131 if ((errcode = pthread_create(&(res_thread->t), NULL,
132 wrapper_start_routine, res_thread)))
133 THROW1(system_error,errcode,
134 "pthread_create failed: %s",strerror(errcode));
139 const char* xbt_os_thread_name(xbt_os_thread_t t) {
143 const char* xbt_os_thread_self_name(void) {
144 xbt_os_thread_t self = xbt_os_thread_self();
145 return self?self->name:"main";
148 xbt_os_thread_join(xbt_os_thread_t thread,void ** thread_return) {
152 if ((errcode = pthread_join(thread->t,thread_return)))
153 THROW1(system_error,errcode, "pthread_join failed: %s",
155 if (thread->exception)
156 free(thread->exception);
158 if (thread == main_thread) /* just killed main thread */
164 void xbt_os_thread_exit(int *retval) {
165 pthread_exit(retval);
168 xbt_os_thread_t xbt_os_thread_self(void) {
171 if (!thread_mod_inited)
174 res = pthread_getspecific(xbt_self_thread_key);
182 void xbt_os_thread_yield(void) {
185 void xbt_os_thread_cancel(xbt_os_thread_t t) {
186 pthread_cancel(t->t);
188 /****** mutex related functions ******/
189 typedef struct xbt_os_mutex_ {
190 /* KEEP IT IN SYNC WITH xbt_thread.c */
197 xbt_os_mutex_t xbt_os_mutex_init(void) {
198 xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t,1);
201 if ((errcode = pthread_mutex_init(&(res->m),NULL)))
202 THROW1(system_error,errcode,"pthread_mutex_init() failed: %s",
208 void xbt_os_mutex_acquire(xbt_os_mutex_t mutex) {
211 if ((errcode=pthread_mutex_lock(&(mutex->m))))
212 THROW2(system_error,errcode,"pthread_mutex_lock(%p) failed: %s",
213 mutex, strerror(errcode));
217 void xbt_os_mutex_timedacquire(xbt_os_mutex_t mutex, double delay) {
221 xbt_os_mutex_acquire(mutex);
223 } else if (delay == 0) {
224 errcode=pthread_mutex_trylock(&(mutex->m));
230 THROW1(timeout_error,0,"mutex %p not ready",mutex);
232 THROW2(system_error,errcode,"xbt_mutex_tryacquire(%p) failed: %s",mutex, strerror(errcode));
238 #ifdef HAVE_MUTEX_TIMEDLOCK
239 struct timespec ts_end;
240 double end = delay + xbt_os_time();
242 ts_end.tv_sec = (time_t) floor(end);
243 ts_end.tv_nsec = (long) ( ( end - ts_end.tv_sec) * 1000000000);
244 DEBUG2("pthread_mutex_timedlock(%p,%p)",&(mutex->m), &ts_end);
246 errcode=pthread_mutex_timedlock(&(mutex->m),&ts_end);
248 #else /* Well, let's reimplement it since those lazy libc dudes didn't */
249 double start = xbt_os_time();
251 errcode = pthread_mutex_trylock(&(mutex->m));
252 if (errcode == EBUSY)
253 xbt_os_thread_yield();
254 } while (errcode == EBUSY && xbt_os_time()-start <delay);
256 if (errcode == EBUSY)
259 #endif /* HAVE_MUTEX_TIMEDLOCK */
266 THROW2(timeout_error,delay,"mutex %p wasn't signaled before timeout (%f)",mutex,delay);
269 THROW3(system_error,errcode,"pthread_mutex_timedlock(%p,%f) failed: %s",mutex,delay, strerror(errcode));
274 void xbt_os_mutex_release(xbt_os_mutex_t mutex) {
277 if ((errcode=pthread_mutex_unlock(&(mutex->m))))
278 THROW2(system_error,errcode,"pthread_mutex_unlock(%p) failed: %s",
279 mutex, strerror(errcode));
282 void xbt_os_mutex_destroy(xbt_os_mutex_t mutex) {
287 if ((errcode=pthread_mutex_destroy(&(mutex->m))))
288 THROW2(system_error,errcode,"pthread_mutex_destroy(%p) failed: %s",
289 mutex, strerror(errcode));
293 /***** condition related functions *****/
294 typedef struct xbt_os_cond_ {
295 /* KEEP IT IN SYNC WITH xbt_thread.c */
299 xbt_os_cond_t xbt_os_cond_init(void) {
300 xbt_os_cond_t res = xbt_new(s_xbt_os_cond_t,1);
302 if ((errcode=pthread_cond_init(&(res->c),NULL)))
303 THROW1(system_error,errcode,"pthread_cond_init() failed: %s",
309 void xbt_os_cond_wait(xbt_os_cond_t cond, xbt_os_mutex_t mutex) {
311 if ((errcode=pthread_cond_wait(&(cond->c),&(mutex->m))))
312 THROW3(system_error,errcode,"pthread_cond_wait(%p,%p) failed: %s",
313 cond,mutex, strerror(errcode));
317 void xbt_os_cond_timedwait(xbt_os_cond_t cond, xbt_os_mutex_t mutex, double delay) {
319 struct timespec ts_end;
320 double end = delay + xbt_os_time();
323 xbt_os_cond_wait(cond,mutex);
325 ts_end.tv_sec = (time_t) floor(end);
326 ts_end.tv_nsec = (long) ( ( end - ts_end.tv_sec) * 1000000000);
327 DEBUG3("pthread_cond_timedwait(%p,%p,%p)",&(cond->c),&(mutex->m), &ts_end);
328 switch ( (errcode=pthread_cond_timedwait(&(cond->c),&(mutex->m), &ts_end)) ) {
332 THROW3(timeout_error,errcode,"condition %p (mutex %p) wasn't signaled before timeout (%f)",
335 THROW4(system_error,errcode,"pthread_cond_timedwait(%p,%p,%f) failed: %s",
336 cond,mutex, delay, strerror(errcode));
341 void xbt_os_cond_signal(xbt_os_cond_t cond) {
343 if ((errcode=pthread_cond_signal(&(cond->c))))
344 THROW2(system_error,errcode,"pthread_cond_signal(%p) failed: %s",
345 cond, strerror(errcode));
348 void xbt_os_cond_broadcast(xbt_os_cond_t cond){
350 if ((errcode=pthread_cond_broadcast(&(cond->c))))
351 THROW2(system_error,errcode,"pthread_cond_broadcast(%p) failed: %s",
352 cond, strerror(errcode));
354 void xbt_os_cond_destroy(xbt_os_cond_t cond){
359 if ((errcode=pthread_cond_destroy(&(cond->c))))
360 THROW2(system_error,errcode,"pthread_cond_destroy(%p) failed: %s",
361 cond, strerror(errcode));
365 void *xbt_os_thread_getparam(void) {
366 xbt_os_thread_t t = xbt_os_thread_self();
367 return t?t->param:NULL;
370 typedef struct xbt_os_sem_ {
371 #ifndef HAVE_SEM_INIT
379 #define SEM_FAILED (-1)
383 xbt_os_sem_init(unsigned int value) {
384 xbt_os_sem_t res = xbt_new(s_xbt_os_sem_t,1);
386 /* On some systems (MAC OS X), only the stub of sem_init is to be found.
387 * Any attempt to use it leads to ENOSYS (function not implemented).
388 * If such a prehistoric system is detected, do the job with sem_open instead
391 if(sem_init(&(res->s),0,value) != 0)
392 THROW1(system_error,errno,"sem_init() failed: %s", strerror(errno));
395 #else /* damn, no sem_init(). Reimplement it */
397 xbt_os_mutex_acquire(next_sem_ID_lock);
398 res->name = bprintf("/%d.%d",(*xbt_getpid)(),++next_sem_ID);
399 xbt_os_mutex_release(next_sem_ID_lock);
401 res->ps = sem_open(res->name, O_CREAT, 0644, value);
402 if ((res->ps == (sem_t *)SEM_FAILED) && (errno == ENAMETOOLONG)) {
403 /* Old darwins only allow 13 chars. Did you create *that* amount of semaphores? */
404 res->name[13] = '\0';
405 res->ps = sem_open(res->name, O_CREAT, 0644, 1);
407 if ((res->ps == (sem_t *)SEM_FAILED))
408 THROW1(system_error,errno,"sem_open() failed: %s",strerror(errno));
410 /* Remove the name from the semaphore namespace: we never join on it */
411 if(sem_unlink(res->name) < 0)
412 THROW1(system_error,errno,"sem_unlink() failed: %s", strerror(errno));
420 xbt_os_sem_acquire(xbt_os_sem_t sem) {
422 THROW0(arg_error,EINVAL,"Cannot acquire of the NULL semaphore");
423 if(sem_wait(sem->ps) < 0)
424 THROW1(system_error,errno,"sem_wait() failed: %s", strerror(errno));
427 void xbt_os_sem_timedacquire(xbt_os_sem_t sem, double delay) {
431 THROW0(arg_error,EINVAL,"Cannot acquire of the NULL semaphore");
434 xbt_os_sem_acquire(sem);
435 } else if (delay==0) {
436 errcode = sem_trywait(sem->ps);
442 THROW1(timeout_error,0,"semaphore %p not ready",sem);
444 THROW2(system_error,errcode,"xbt_sem_tryacquire(%p) failed: %s",sem, strerror(errcode));
449 struct timespec ts_end;
450 double end = delay + xbt_os_time();
452 ts_end.tv_sec = (time_t) floor(end);
453 ts_end.tv_nsec = (long) ( ( end - ts_end.tv_sec) * 1000000000);
454 DEBUG2("sem_timedwait(%p,%p)",sem->ps,&ts_end);
455 errcode = sem_timedwait(sem->s,&ts_end);
457 #else /* Okay, reimplement this function then */
458 double start = xbt_os_time();
460 errcode = sem_trywait(sem->ps);
461 if (errcode == EBUSY)
462 xbt_os_thread_yield();
463 } while (errcode == EBUSY && xbt_os_time()-start <delay);
465 if (errcode == EBUSY)
474 THROW2(timeout_error,delay,"semaphore %p wasn't signaled before timeout (%f)",sem,delay);
477 THROW3(system_error,errcode,"sem_timedwait(%p,%f) failed: %s",sem,delay, strerror(errcode));
483 xbt_os_sem_release(xbt_os_sem_t sem)
486 THROW0(arg_error,EINVAL,"Cannot release of the NULL semaphore");
488 if(sem_post(sem->ps) < 0)
489 THROW1(system_error,errno,"sem_post() failed: %s",
494 xbt_os_sem_destroy(xbt_os_sem_t sem)
497 THROW0(arg_error,EINVAL,"Cannot destroy the NULL sempahore");
500 if(sem_destroy(sem->ps)) < 0)
501 THROW1(system_error,errno,"sem_destroy() failed: %s",
504 if(sem_close(sem->ps) < 0)
505 THROW1(system_error,errno,"sem_close() failed: %s",
514 xbt_os_sem_get_value(xbt_os_sem_t sem, int* svalue)
517 THROW0(arg_error,EINVAL,"Cannot get the value of the NULL semaphore");
519 if(sem_getvalue(&(sem->s),svalue) < 0)
520 THROW1(system_error,errno,"sem_getvalue() failed: %s",
524 /* ********************************* WINDOWS IMPLEMENTATION ************************************ */
530 typedef struct xbt_os_thread_ {
532 HANDLE handle; /* the win thread handle */
533 unsigned long id; /* the win thread id */
534 pvoid_f_pvoid_t start_routine;
536 } s_xbt_os_thread_t ;
538 /* so we can specify the size of the stack of the threads */
539 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
540 #define STACK_SIZE_PARAM_IS_A_RESERVATION 0x00010000
543 /* the default size of the stack of the threads (in bytes)*/
544 #define XBT_DEFAULT_THREAD_STACK_SIZE 4096
546 /* key to the TLS containing the xbt_os_thread_t structure */
547 static unsigned long xbt_self_thread_key;
549 void xbt_os_thread_mod_init(void) {
550 xbt_self_thread_key = TlsAlloc();
552 void xbt_os_thread_mod_exit(void) {
554 if (!TlsFree(xbt_self_thread_key))
555 THROW0(system_error,(int)GetLastError(),"TlsFree() failed to cleanup the thread submodule");
558 static DWORD WINAPI wrapper_start_routine(void *s) {
559 xbt_os_thread_t t = (xbt_os_thread_t)s;
562 if(!TlsSetValue(xbt_self_thread_key,t))
563 THROW0(system_error,(int)GetLastError(),"TlsSetValue of data describing the created thread failed");
565 rv = (*(t->start_routine))(t->param);
567 return *((DWORD*)rv);
571 xbt_os_thread_t xbt_os_thread_create(const char *name,pvoid_f_pvoid_t start_routine,
574 xbt_os_thread_t t = xbt_new(s_xbt_os_thread_t,1);
576 t->name = xbt_strdup(name);
577 t->start_routine = start_routine ;
580 t->handle = CreateThread(NULL,XBT_DEFAULT_THREAD_STACK_SIZE,
581 (LPTHREAD_START_ROUTINE)wrapper_start_routine,
582 t,STACK_SIZE_PARAM_IS_A_RESERVATION,&(t->id));
586 THROW0(system_error,(int)GetLastError(),"CreateThread failed");
592 const char* xbt_os_thread_name(xbt_os_thread_t t) {
596 const char* xbt_os_thread_self_name(void) {
597 xbt_os_thread_t t = xbt_os_thread_self();
598 return t?t->name:"main";
602 xbt_os_thread_join(xbt_os_thread_t thread,void ** thread_return) {
604 if(WAIT_OBJECT_0 != WaitForSingleObject(thread->handle,INFINITE))
605 THROW0(system_error,(int)GetLastError(), "WaitForSingleObject failed");
609 if(!GetExitCodeThread(thread->handle,(DWORD*)(*thread_return)))
610 THROW0(system_error,(int)GetLastError(), "GetExitCodeThread failed");
613 CloseHandle(thread->handle);
618 void xbt_os_thread_exit(int *retval) {
625 xbt_os_thread_t xbt_os_thread_self(void) {
626 return TlsGetValue(xbt_self_thread_key);
629 void *xbt_os_thread_getparam(void) {
630 xbt_os_thread_t t = xbt_os_thread_self();
635 void xbt_os_thread_yield(void) {
638 void xbt_os_thread_cancel(xbt_os_thread_t t) {
642 /****** mutex related functions ******/
643 typedef struct xbt_os_mutex_ {
644 /* KEEP IT IN SYNC WITH xbt_thread.c */
645 CRITICAL_SECTION lock;
648 xbt_os_mutex_t xbt_os_mutex_init(void) {
649 xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t,1);
651 /* initialize the critical section object */
652 InitializeCriticalSection(&(res->lock));
657 void xbt_os_mutex_acquire(xbt_os_mutex_t mutex) {
659 EnterCriticalSection(& mutex->lock);
662 void xbt_os_mutex_tryacquire(xbt_os_mutex_t mutex)
664 TryEnterCriticalSection(&mutex->lock);
667 void xbt_os_mutex_timedacquire(xbt_os_mutex_t mutex, double delay) {
671 void xbt_os_mutex_release(xbt_os_mutex_t mutex) {
673 LeaveCriticalSection (&mutex->lock);
677 void xbt_os_mutex_destroy(xbt_os_mutex_t mutex) {
681 DeleteCriticalSection(& mutex->lock);
685 /***** condition related functions *****/
686 enum { /* KEEP IT IN SYNC WITH xbt_thread.c */
692 typedef struct xbt_os_cond_ {
693 /* KEEP IT IN SYNC WITH xbt_thread.c */
694 HANDLE events[MAX_EVENTS];
696 unsigned int waiters_count; /* the number of waiters */
697 CRITICAL_SECTION waiters_count_lock; /* protect access to waiters_count */
700 xbt_os_cond_t xbt_os_cond_init(void) {
702 xbt_os_cond_t res = xbt_new0(s_xbt_os_cond_t,1);
704 memset(& res->waiters_count_lock,0,sizeof(CRITICAL_SECTION));
706 /* initialize the critical section object */
707 InitializeCriticalSection(& res->waiters_count_lock);
709 res->waiters_count = 0;
711 /* Create an auto-reset event */
712 res->events[SIGNAL] = CreateEvent (NULL, FALSE, FALSE, NULL);
714 if(!res->events[SIGNAL]){
715 DeleteCriticalSection(& res->waiters_count_lock);
717 THROW0(system_error,0,"CreateEvent failed for the signals");
720 /* Create a manual-reset event. */
721 res->events[BROADCAST] = CreateEvent (NULL, TRUE, FALSE,NULL);
723 if(!res->events[BROADCAST]){
725 DeleteCriticalSection(& res->waiters_count_lock);
726 CloseHandle(res->events[SIGNAL]);
728 THROW0(system_error,0,"CreateEvent failed for the broadcasts");
734 void xbt_os_cond_wait(xbt_os_cond_t cond, xbt_os_mutex_t mutex) {
736 unsigned long wait_result;
739 /* lock the threads counter and increment it */
740 EnterCriticalSection (& cond->waiters_count_lock);
741 cond->waiters_count++;
742 LeaveCriticalSection (& cond->waiters_count_lock);
744 /* unlock the mutex associate with the condition */
745 LeaveCriticalSection (& mutex->lock);
747 /* wait for a signal (broadcast or no) */
748 wait_result = WaitForMultipleObjects (2, cond->events, FALSE, INFINITE);
750 if(wait_result == WAIT_FAILED)
751 THROW0(system_error,0,"WaitForMultipleObjects failed, so we cannot wait on the condition");
753 /* we have a signal lock the condition */
754 EnterCriticalSection (& cond->waiters_count_lock);
755 cond->waiters_count--;
757 /* it's the last waiter or it's a broadcast ? */
758 is_last_waiter = ((wait_result == WAIT_OBJECT_0 + BROADCAST - 1) && (cond->waiters_count == 0));
760 LeaveCriticalSection (& cond->waiters_count_lock);
762 /* yes it's the last waiter or it's a broadcast
763 * only reset the manual event (the automatic event is reset in the WaitForMultipleObjects() function
767 if(!ResetEvent (cond->events[BROADCAST]))
768 THROW0(system_error,0,"ResetEvent failed");
770 /* relock the mutex associated with the condition in accordance with the posix thread specification */
771 EnterCriticalSection (& mutex->lock);
773 void xbt_os_cond_timedwait(xbt_os_cond_t cond, xbt_os_mutex_t mutex, double delay) {
775 unsigned long wait_result = WAIT_TIMEOUT;
777 unsigned long end = (unsigned long)(delay * 1000);
781 xbt_os_cond_wait(cond,mutex);
783 DEBUG3("xbt_cond_timedwait(%p,%p,%ul)",&(cond->events),&(mutex->lock),end);
785 /* lock the threads counter and increment it */
786 EnterCriticalSection (& cond->waiters_count_lock);
787 cond->waiters_count++;
788 LeaveCriticalSection (& cond->waiters_count_lock);
790 /* unlock the mutex associate with the condition */
791 LeaveCriticalSection (& mutex->lock);
792 /* wait for a signal (broadcast or no) */
794 wait_result = WaitForMultipleObjects (2, cond->events, FALSE, end);
796 switch(wait_result) {
798 THROW3(timeout_error,GetLastError(),"condition %p (mutex %p) wasn't signaled before timeout (%f)",cond,mutex, delay);
800 THROW0(system_error,GetLastError(),"WaitForMultipleObjects failed, so we cannot wait on the condition");
803 /* we have a signal lock the condition */
804 EnterCriticalSection (& cond->waiters_count_lock);
805 cond->waiters_count--;
807 /* it's the last waiter or it's a broadcast ? */
808 is_last_waiter = ((wait_result == WAIT_OBJECT_0 + BROADCAST - 1) && (cond->waiters_count == 0));
810 LeaveCriticalSection (& cond->waiters_count_lock);
812 /* yes it's the last waiter or it's a broadcast
813 * only reset the manual event (the automatic event is reset in the WaitForMultipleObjects() function
817 if(!ResetEvent (cond->events[BROADCAST]))
818 THROW0(system_error,0,"ResetEvent failed");
820 /* relock the mutex associated with the condition in accordance with the posix thread specification */
821 EnterCriticalSection (& mutex->lock);
823 /*THROW_UNIMPLEMENTED;*/
826 void xbt_os_cond_signal(xbt_os_cond_t cond) {
829 EnterCriticalSection (& cond->waiters_count_lock);
830 have_waiters = cond->waiters_count > 0;
831 LeaveCriticalSection (& cond->waiters_count_lock);
834 if(!SetEvent(cond->events[SIGNAL]))
835 THROW0(system_error,0,"SetEvent failed");
837 xbt_os_thread_yield();
840 void xbt_os_cond_broadcast(xbt_os_cond_t cond){
843 EnterCriticalSection (& cond->waiters_count_lock);
844 have_waiters = cond->waiters_count > 0;
845 LeaveCriticalSection (& cond->waiters_count_lock);
848 SetEvent(cond->events[BROADCAST]);
851 void xbt_os_cond_destroy(xbt_os_cond_t cond){
856 if(!CloseHandle(cond->events[SIGNAL]))
859 if(!CloseHandle(cond->events[BROADCAST]))
862 DeleteCriticalSection(& cond->waiters_count_lock);
867 THROW0(system_error,0,"Error while destroying the condition");
870 typedef struct xbt_os_sem_ {
873 CRITICAL_SECTION value_lock; /* protect access to value of the semaphore */
877 xbt_os_sem_init(unsigned int value)
882 THROW1(arg_error,value,"Semaphore initial value too big: %ud cannot be stored as a signed int",value);
884 res = (xbt_os_sem_t)xbt_new0(s_xbt_os_sem_t,1);
886 if(!(res->h = CreateSemaphore(NULL,value,(long)INT_MAX,NULL))) {
887 THROW1(system_error,GetLastError(),"CreateSemaphore() failed: %s",
888 strerror(GetLastError()));
894 InitializeCriticalSection(&(res->value_lock));
900 xbt_os_sem_acquire(xbt_os_sem_t sem)
903 THROW0(arg_error,EINVAL,"Cannot acquire the NULL semaphore");
906 if(WAIT_OBJECT_0 != WaitForSingleObject(sem->h,INFINITE))
907 THROW1(system_error,GetLastError(),"WaitForSingleObject() failed: %s",
908 strerror(GetLastError()));
909 EnterCriticalSection(&(sem->value_lock));
911 LeaveCriticalSection(&(sem->value_lock));
914 void xbt_os_sem_timedacquire(xbt_os_sem_t sem, double timeout)
918 double end = timeout + xbt_os_time();
921 THROW0(arg_error,EINVAL,"Cannot acquire the NULL semaphore");
925 xbt_os_sem_acquire(sem);
927 else /* timeout can be zero <-> try acquire ) */
930 seconds = (long) floor(end);
931 milliseconds = (long)( ( end - seconds) * 1000);
932 milliseconds += (seconds * 1000);
934 switch(WaitForSingleObject(sem->h,milliseconds))
937 EnterCriticalSection(&(sem->value_lock));
939 LeaveCriticalSection(&(sem->value_lock));
943 THROW2(timeout_error,GetLastError(),"semaphore %p wasn't signaled before timeout (%f)",sem,timeout);
947 THROW3(system_error,GetLastError(),"WaitForSingleObject(%p,%f) failed: %s",sem,timeout, strerror(GetLastError()));
953 xbt_os_sem_release(xbt_os_sem_t sem)
956 THROW0(arg_error,EINVAL,"Cannot release the NULL semaphore");
958 if(!ReleaseSemaphore(sem->h,1, NULL))
959 THROW1(system_error,GetLastError(),"ReleaseSemaphore() failed: %s",
960 strerror(GetLastError()));
961 EnterCriticalSection (&(sem->value_lock));
963 LeaveCriticalSection(&(sem->value_lock));
967 xbt_os_sem_destroy(xbt_os_sem_t sem)
970 THROW0(arg_error,EINVAL,"Cannot destroy the NULL semaphore");
972 if(!CloseHandle(sem->h))
973 THROW1(system_error,GetLastError(),"CloseHandle() failed: %s",
974 strerror(GetLastError()));
976 DeleteCriticalSection(&(sem->value_lock));
983 xbt_os_sem_get_value(xbt_os_sem_t sem, int* svalue)
986 THROW0(arg_error,EINVAL,"Cannot get the value of the NULL semaphore");
988 EnterCriticalSection(&(sem->value_lock));
989 *svalue = sem->value;
990 LeaveCriticalSection(&(sem->value_lock));