/* Used in RL to get win/lin portability, and in SG when CONTEXT_THREAD */
/* in SG, when using CONTEXT_UCONTEXT, xbt_os_thread_stub is used instead */
-/* Copyright 2006,2007 Malek Cherier, Martin Quinson
+/* Copyright 2006,2007 Malek Cherier, Martin Quinson
* All right reserved. */
/* This program is free software; you can redistribute it and/or modify it
/* ********************************* PTHREAD IMPLEMENTATION ************************************ */
#ifdef HAVE_PTHREAD_H
#include <pthread.h>
+#include <semaphore.h>
+/* use named sempahore instead */
+#ifndef HAVE_SEM_WAIT
+# define MAX_SEM_NAME ((size_t)13)
+ static int __next_sem_ID = 0;
+ static pthread_mutex_t __next_sem_ID_lock;
+#endif
typedef struct xbt_os_thread_ {
pthread_t t;
void xbt_os_thread_mod_init(void) {
int errcode;
-
+
if (thread_mod_inited)
return;
-
+
if ((errcode=pthread_key_create(&xbt_self_thread_key, NULL)))
THROW0(system_error,errcode,"pthread_key_create failed for xbt_self_thread_key");
__xbt_ex_ctx = _os_thread_ex_ctx;
__xbt_ex_terminate = _os_thread_ex_terminate;
+ #ifndef HAVE_SEM_WAIT
+
+ /* initialize the mutex use to protect the incrementation of the variable __next_sem_ID
+ * used to build the name of the named sempahore
+ */
+ if ((errcode = pthread_mutex_init(&__next_sem_ID_lock,NULL)))
+ THROW1(system_error,errcode,"pthread_mutex_init() failed: %s",strerror(errcode));
+
+ #endif
+
thread_mod_inited = 1;
}
void xbt_os_thread_mod_exit(void) {
- /* FIXME: don't try to free our key on shutdown.
+ /* FIXME: don't try to free our key on shutdown.
Valgrind detects no leak if we don't, and whine if we try to */
// int errcode;
-
+
// if ((errcode=pthread_key_delete(xbt_self_thread_key)))
// THROW0(system_error,errcode,"pthread_key_delete failed for xbt_self_thread_key");
}
static void * wrapper_start_routine(void *s) {
- xbt_os_thread_t t = s;
+ xbt_os_thread_t t = s;
int errcode;
if ((errcode=pthread_setspecific(xbt_self_thread_key,t)))
THROW0(system_error,errcode,
- "pthread_setspecific failed for xbt_self_thread_key");
- return (*t->start_routine)(t->param);
+ "pthread_setspecific failed for xbt_self_thread_key");
+
+ return (*(t->start_routine))(t->param);
}
+
xbt_os_thread_t xbt_os_thread_create(const char*name,
pvoid_f_pvoid_t start_routine,
void* param) {
res_thread->param = param;
res_thread->exception = xbt_new(ex_ctx_t, 1);
XBT_CTX_INITIALIZE(res_thread->exception);
-
- if ((errcode = pthread_create(&(res_thread->t), NULL,
+
+ if ((errcode = pthread_create(&(res_thread->t), NULL,
wrapper_start_routine, res_thread)))
- THROW1(system_error,errcode,
+ THROW1(system_error,errcode,
"pthread_create failed: %s",strerror(errcode));
return res_thread;
xbt_os_thread_t self = xbt_os_thread_self();
return self?self->name:"main";
}
-void
+void
xbt_os_thread_join(xbt_os_thread_t thread,void ** thread_return) {
-
- int errcode;
-
+
+ int errcode;
+
if ((errcode = pthread_join(thread->t,thread_return)))
THROW1(system_error,errcode, "pthread_join failed: %s",
strerror(errcode));
if (thread == main_thread) /* just killed main thread */
main_thread = NULL;
- free(thread);
-}
+ free(thread);
+}
void xbt_os_thread_exit(int *retval) {
pthread_exit(retval);
if (!thread_mod_inited)
return NULL;
-
+
res = pthread_getspecific(xbt_self_thread_key);
if (!res)
res = main_thread;
pthread_mutex_t m;
} s_xbt_os_mutex_t;
+#include <time.h>
+#include <math.h>
+
xbt_os_mutex_t xbt_os_mutex_init(void) {
xbt_os_mutex_t res = xbt_new(s_xbt_os_mutex_t,1);
int errcode;
-
+
if ((errcode = pthread_mutex_init(&(res->m),NULL)))
THROW1(system_error,errcode,"pthread_mutex_init() failed: %s",
strerror(errcode));
-
+
return res;
}
-void xbt_os_mutex_lock(xbt_os_mutex_t mutex) {
+void xbt_os_mutex_acquire(xbt_os_mutex_t mutex) {
int errcode;
-
+
if ((errcode=pthread_mutex_lock(&(mutex->m))))
THROW2(system_error,errcode,"pthread_mutex_lock(%p) failed: %s",
mutex, strerror(errcode));
}
-void xbt_os_mutex_unlock(xbt_os_mutex_t mutex) {
+
+
+#ifndef HAVE_PTHREAD_MUTEX_TIMEDLOCK
+/* if the function is not availabled or if is MAC OS X use pthread_mutex_trylock() to define
+ * it.
+ */
+#include <time.h> /* declaration of the timespec structure and of the nanosleep() function */
+int pthread_mutex_timedlock(pthread_mutex_t * mutex, const struct timespec * abs_timeout)
+{
+ int rv;
+ long ellapsed_time = 0;
+ struct timespec ts;
+
+ do
+ {
+ /* the mutex could not be acquired because it was already locked by an other thread */
+ rv = pthread_mutex_trylock(mutex);
+
+ ts.tv_sec = 0;
+ ts.tv_nsec = 2.5e7 /* (25 ms (2 context switch + 5 ms)) */;
+
+ do
+ {
+ nanosleep(&ts, &ts);
+ }while(EINTR == errno);
+
+ ellapsed_time += ts.tv_nsec;
+
+ }
+ while (/* locked */ (EBUSY == rv) && /* !timeout */ (ellapsed_time < ((long)(abs_timeout->tv_sec * 1e9) + abs_timeout->tv_nsec)));
+
+ return (EBUSY == rv) ? ETIMEDOUT : rv;
+}
+
+#endif
+
+void xbt_os_mutex_timedacquire(xbt_os_mutex_t mutex, double delay) {
+ int errcode;
+ struct timespec ts_end;
+ double end = delay + xbt_os_time();
+
+ if (delay < 0) {
+ xbt_os_mutex_acquire(mutex);
+ }
+ else if(!delay /* equals 0 */)
+ {
+ if ((errcode=pthread_mutex_trylock(&(mutex->m))))
+ THROW2(system_error,errcode,"pthread_mutex_trylock(%p) failed: %s",mutex, strerror(errcode));
+
+ } else {
+ ts_end.tv_sec = (time_t) floor(end);
+ ts_end.tv_nsec = (long) ( ( end - ts_end.tv_sec) * 1000000000);
+ DEBUG2("pthread_mutex_timedlock(%p,%p)",&(mutex->m), &ts_end);
+
+ switch ((errcode=pthread_mutex_timedlock(&(mutex->m),&ts_end)))
+ {
+ case 0:
+ return;
+
+ case ETIMEDOUT:
+ THROW2(timeout_error,errcode,"mutex %p wasn't signaled before timeout (%f)",mutex,delay);
+
+ default:
+ THROW3(system_error,errcode,"pthread_mutex_timedlock(%p,%f) failed: %s",mutex,delay, strerror(errcode));
+ }
+ }
+}
+
+void xbt_os_mutex_release(xbt_os_mutex_t mutex) {
int errcode;
-
+
if ((errcode=pthread_mutex_unlock(&(mutex->m))))
THROW2(system_error,errcode,"pthread_mutex_unlock(%p) failed: %s",
mutex, strerror(errcode));
void xbt_os_mutex_destroy(xbt_os_mutex_t mutex) {
int errcode;
-
+
if (!mutex) return;
-
+
if ((errcode=pthread_mutex_destroy(&(mutex->m))))
THROW2(system_error,errcode,"pthread_mutex_destroy(%p) failed: %s",
mutex, strerror(errcode));
cond,mutex, strerror(errcode));
}
-#include <time.h>
-#include <math.h>
+
void xbt_os_cond_timedwait(xbt_os_cond_t cond, xbt_os_mutex_t mutex, double delay) {
int errcode;
struct timespec ts_end;
double end = delay + xbt_os_time();
-
+
if (delay < 0) {
xbt_os_cond_wait(cond,mutex);
} else {
default:
THROW4(system_error,errcode,"pthread_cond_timedwait(%p,%p,%f) failed: %s",
cond,mutex, delay, strerror(errcode));
- }
+ }
}
}
THROW2(system_error,errcode,"pthread_cond_signal(%p) failed: %s",
cond, strerror(errcode));
}
-
+
void xbt_os_cond_broadcast(xbt_os_cond_t cond){
int errcode;
if ((errcode=pthread_cond_broadcast(&(cond->c))))
return t?t->param:NULL;
}
+typedef struct xbt_os_sem_ {
+ #ifndef HAVE_SEM_WAIT
+ char* name;
+ sem_t* s;
+ #else
+ sem_t s;
+ #endif
+}s_xbt_os_sem_t ;
+
+xbt_os_sem_t
+xbt_os_sem_init(unsigned int value)
+{
+ xbt_os_sem_t res = xbt_new(s_xbt_os_sem_t,1);
+ int errcode;
+
+ /* On MAC OS X, it seems that the sem_init is failing with ENOSYS,
+ * which means the sem_init function is not implemented use sem_open()
+ * instead
+ */
+ #ifndef HAVE_SEM_INIT
+ res->name = (char*) calloc(MAX_SEM_NAME + 1,sizeof(char));
+
+ if((errcode = pthread_mutex_lock(&__next_sem_ID_lock)))
+ THROW1(system_error,errcode,"pthread_mutex_lock() failed: %s", strerror(errcode));
+
+ __next_sem_ID++;
+
+ if((errcode = pthread_mutex_unlock(&__next_sem_ID_lock)))
+ THROW1(system_error,errcode,"pthread_mutex_unlock() failed: %s", strerror(errcode));
+
+ sprintf(res->name,"/%d.%d",(*xbt_getpid)(),__next_sem_ID);
+
+ if((res->s = sem_open(res->name, O_CREAT, 0644, value)) == (sem_t*)SEM_FAILED)
+ THROW1(system_error,errno,"sem_open() failed: %s",strerror(errno));
+
+ if(sem_unlink(res->name) < 0)
+ THROW1(system_error,errno,"sem_unlink() failed: %s", strerror(errno));
+
+
+ #else
+ /* sem_init() is implemented, use it */
+ if(sem_init(&(res->s),0,value) < 0)
+ THROW1(system_error,errno,"sem_init() failed: %s",
+ strerror(errno));
+ #endif
+
+ return res;
+}
+
+void
+xbt_os_sem_acquire(xbt_os_sem_t sem)
+{
+ if(!sem)
+ THROW0(arg_error,EINVAL,"Cannot acquire of the NULL semaphore");
+ #ifndef HAVE_SEM_WAIT
+ if(sem_wait((sem->s)) < 0)
+ THROW1(system_error,errno,"sem_wait() failed: %s",
+ strerror(errno));
+ #else
+ if(sem_wait(&(sem->s)) < 0)
+ THROW1(system_error,errno,"sem_wait() failed: %s",
+ strerror(errno));
+ #endif
+}
+
+#ifndef HAVE_SEM_TIMEDWAIT
+/* if the function is not availabled or if is MAC OS X use sem_trywait() to define
+ * it.
+ */
+#include <time.h> /* declaration of the timespec structure and of the nanosleep() function */
+int sem_timedwait(sem_t* sem, const struct timespec * abs_timeout)
+{
+ int rv;
+ long ellapsed_time = 0;
+ struct timespec ts;
+
+ do
+ {
+ rv = sem_trywait(sem);
+ ts.tv_sec = 0;
+ ts.tv_nsec = 2.5e7 /* (25 ms (2 * context switch + 5 ms)) */;
+
+ do
+ {
+ nanosleep(&ts, &ts);
+ }while(EINTR == errno);
+
+ ellapsed_time += ts.tv_nsec;
+
+ }
+ while(/* locked */ (EAGAIN == rv) && /* !timeout */ ellapsed_time < ((long)(abs_timeout->tv_sec * 1e9) + abs_timeout->tv_nsec));
+
+ return (EAGAIN == rv) ? ETIMEDOUT : rv;
+}
+
+#endif
+
+void xbt_os_sem_timedacquire(xbt_os_sem_t sem,double timeout)
+{
+ int errcode;
+ struct timespec ts_end;
+ double end = timeout + xbt_os_time();
+
+ if(!sem)
+ THROW0(arg_error,EINVAL,"Cannot acquire of the NULL semaphore");
+
+ if (timeout < 0)
+ {
+ xbt_os_sem_acquire(sem);
+ }
+ else if(!timeout)
+ {
+ #ifndef HAVE_SEM_TIMEDWAIT
+ if(sem_trywait(sem->s) < 0)
+ THROW2(system_error,errno,"sem_trywait(%p) failed: %s",sem,strerror(errno));
+ #else
+ if(sem_trywait(sem->s) < 0)
+ THROW2(system_error,errno,"sem_trywait(%p) failed: %s",sem,strerror(errno));
+ #endif
+ }
+ else
+ {
+ ts_end.tv_sec = (time_t) floor(end);
+ ts_end.tv_nsec = (long) ( ( end - ts_end.tv_sec) * 1000000000);
+ DEBUG2("sem_timedwait(%p,%p)",&(sem->s),&ts_end);
+
+ #ifndef HAVE_SEM_WAIT
+ switch ((errcode = sem_timedwait(sem->s,&ts_end)))
+ #else
+ switch ((errcode = sem_timedwait(&(sem->s),&ts_end)))
+ #endif
+ {
+ case 0:
+ return;
+
+ case ETIMEDOUT:
+ THROW2(timeout_error,errcode,"semaphore %p wasn't signaled before timeout (%f)",sem,timeout);
+
+ default:
+ THROW3(system_error,errcode,"sem_timedwait(%p,%f) failed: %s",sem,timeout, strerror(errcode));
+ }
+ }
+
+}
+
+void
+xbt_os_sem_release(xbt_os_sem_t sem)
+{
+ if(!sem)
+ THROW0(arg_error,EINVAL,"Cannot release of the NULL semaphore");
+
+ #ifndef HAVE_SEM_WAIT
+ if(sem_post((sem->s)) < 0)
+ THROW1(system_error,errno,"sem_post() failed: %s",
+ strerror(errno));
+ #else
+ if(sem_post(&(sem->s)) < 0)
+ THROW1(system_error,errno,"sem_post() failed: %s",
+ strerror(errno));
+ #endif
+}
+
+void
+xbt_os_sem_destroy(xbt_os_sem_t sem)
+{
+ if(!sem)
+ THROW0(arg_error,EINVAL,"Cannot destroy the NULL sempahore");
+
+ #ifndef HAVE_SEM_WAIT
+ /* MAC OS X does not implement the sem_init() function so,
+ * we use the named semaphore (sem_open)
+ */
+ if(sem_close((sem->s)) < 0)
+ THROW1(system_error,errno,"sem_close() failed: %s",
+ strerror(errno));
+
+ xbt_free(sem->name);
+
+ #else
+ if(sem_destroy(&(sem->s)) < 0)
+ THROW1(system_error,errno,"sem_destroy() failed: %s",
+ strerror(errno));
+ #endif
+
+ xbt_free(sem);
+}
+
+void
+xbt_os_sem_get_value(xbt_os_sem_t sem, int* svalue)
+{
+ if(!sem)
+ THROW0(arg_error,EINVAL,"Cannot get the value of the NULL semaphore");
+
+ #ifndef HAVE_SEM_WAIT
+ if(sem_getvalue((sem->s),svalue) < 0)
+ THROW1(system_error,errno,"sem_getvalue() failed: %s",
+ strerror(errno));
+ #else
+ if(sem_getvalue(&(sem->s),svalue) < 0)
+ THROW1(system_error,errno,"sem_getvalue() failed: %s",
+ strerror(errno));
+ #endif
+}
+
/* ********************************* WINDOWS IMPLEMENTATION ************************************ */
#elif defined(WIN32)
+#include <math.h>
+
typedef struct xbt_os_thread_ {
char *name;
HANDLE handle; /* the win thread handle */
void* param;
} s_xbt_os_thread_t ;
+/* so we can specify the size of the stack of the threads */
+#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
+#define STACK_SIZE_PARAM_IS_A_RESERVATION 0x00010000
+#endif
+
+/* the default size of the stack of the threads (in bytes)*/
+#define XBT_DEFAULT_THREAD_STACK_SIZE 4096
+
/* key to the TLS containing the xbt_os_thread_t structure */
static unsigned long xbt_self_thread_key;
xbt_self_thread_key = TlsAlloc();
}
void xbt_os_thread_mod_exit(void) {
-
- if (!TlsFree(xbt_self_thread_key))
+
+ if (!TlsFree(xbt_self_thread_key))
THROW0(system_error,(int)GetLastError(),"TlsFree() failed to cleanup the thread submodule");
}
static DWORD WINAPI wrapper_start_routine(void *s) {
xbt_os_thread_t t = (xbt_os_thread_t)s;
-
+ void* rv;
+
if(!TlsSetValue(xbt_self_thread_key,t))
THROW0(system_error,(int)GetLastError(),"TlsSetValue of data describing the created thread failed");
-
- return (DWORD)t->start_routine(t->param);
+
+ rv = (*(t->start_routine))(t->param);
+
+ return *((DWORD*)rv);
}
xbt_os_thread_t xbt_os_thread_create(const char *name,pvoid_f_pvoid_t start_routine,
void* param) {
-
+
xbt_os_thread_t t = xbt_new(s_xbt_os_thread_t,1);
t->name = xbt_strdup(name);
t->start_routine = start_routine ;
t->param = param;
-
- t->handle = CreateThread(NULL,0,
+
+ t->handle = CreateThread(NULL,XBT_DEFAULT_THREAD_STACK_SIZE,
(LPTHREAD_START_ROUTINE)wrapper_start_routine,
- t,0,&(t->id));
-
+ t,STACK_SIZE_PARAM_IS_A_RESERVATION,&(t->id));
+
if(!t->handle) {
xbt_free(t);
THROW0(system_error,(int)GetLastError(),"CreateThread failed");
}
-
+
return t;
}
return t?t->name:"main";
}
-void
+void
xbt_os_thread_join(xbt_os_thread_t thread,void ** thread_return) {
- if(WAIT_OBJECT_0 != WaitForSingleObject(thread->handle,INFINITE))
+ if(WAIT_OBJECT_0 != WaitForSingleObject(thread->handle,INFINITE))
THROW0(system_error,(int)GetLastError(), "WaitForSingleObject failed");
-
+
if(thread_return){
-
+
if(!GetExitCodeThread(thread->handle,(DWORD*)(*thread_return)))
THROW0(system_error,(int)GetLastError(), "GetExitCodeThread failed");
}
-
+
CloseHandle(thread->handle);
free(thread->name);
free(thread);
/****** mutex related functions ******/
typedef struct xbt_os_mutex_ {
/* KEEP IT IN SYNC WITH xbt_thread.c */
- CRITICAL_SECTION lock;
+ CRITICAL_SECTION lock;
} s_xbt_os_mutex_t;
xbt_os_mutex_t xbt_os_mutex_init(void) {
/* initialize the critical section object */
InitializeCriticalSection(&(res->lock));
-
+
return res;
}
-void xbt_os_mutex_lock(xbt_os_mutex_t mutex) {
+void xbt_os_mutex_acquire(xbt_os_mutex_t mutex) {
EnterCriticalSection(& mutex->lock);
}
-void xbt_os_mutex_unlock(xbt_os_mutex_t mutex) {
+void xbt_os_mutex_tryacquire(xbt_os_mutex_t mutex)
+{
+ TryEnterCriticalSection(&mutex->lock);
+}
- LeaveCriticalSection (& mutex->lock);
+void xbt_os_mutex_timedacquire(xbt_os_mutex_t mutex, double delay) {
+ THROW_UNIMPLEMENTED;
+}
+
+void xbt_os_mutex_release(xbt_os_mutex_t mutex) {
+
+ LeaveCriticalSection (&mutex->lock);
}
void xbt_os_mutex_destroy(xbt_os_mutex_t mutex) {
if (!mutex) return;
-
- DeleteCriticalSection(& mutex->lock);
+
+ DeleteCriticalSection(& mutex->lock);
free(mutex);
}
typedef struct xbt_os_cond_ {
/* KEEP IT IN SYNC WITH xbt_thread.c */
HANDLE events[MAX_EVENTS];
-
+
unsigned int waiters_count; /* the number of waiters */
CRITICAL_SECTION waiters_count_lock; /* protect access to waiters_count */
} s_xbt_os_cond_t;
xbt_os_cond_t xbt_os_cond_init(void) {
xbt_os_cond_t res = xbt_new0(s_xbt_os_cond_t,1);
-
+
memset(& res->waiters_count_lock,0,sizeof(CRITICAL_SECTION));
-
+
/* initialize the critical section object */
InitializeCriticalSection(& res->waiters_count_lock);
-
+
res->waiters_count = 0;
-
+
/* Create an auto-reset event */
- res->events[SIGNAL] = CreateEvent (NULL, FALSE, FALSE, NULL);
-
+ res->events[SIGNAL] = CreateEvent (NULL, FALSE, FALSE, NULL);
+
if(!res->events[SIGNAL]){
DeleteCriticalSection(& res->waiters_count_lock);
free(res);
THROW0(system_error,0,"CreateEvent failed for the signals");
}
-
+
/* Create a manual-reset event. */
res->events[BROADCAST] = CreateEvent (NULL, TRUE, FALSE,NULL);
-
+
if(!res->events[BROADCAST]){
-
- DeleteCriticalSection(& res->waiters_count_lock);
+
+ DeleteCriticalSection(& res->waiters_count_lock);
CloseHandle(res->events[SIGNAL]);
- free(res);
+ free(res);
THROW0(system_error,0,"CreateEvent failed for the broadcasts");
}
}
void xbt_os_cond_wait(xbt_os_cond_t cond, xbt_os_mutex_t mutex) {
-
+
unsigned long wait_result;
int is_last_waiter;
EnterCriticalSection (& cond->waiters_count_lock);
cond->waiters_count++;
LeaveCriticalSection (& cond->waiters_count_lock);
-
+
/* unlock the mutex associate with the condition */
LeaveCriticalSection (& mutex->lock);
-
+
/* wait for a signal (broadcast or no) */
wait_result = WaitForMultipleObjects (2, cond->events, FALSE, INFINITE);
-
+
if(wait_result == WAIT_FAILED)
THROW0(system_error,0,"WaitForMultipleObjects failed, so we cannot wait on the condition");
-
+
/* we have a signal lock the condition */
EnterCriticalSection (& cond->waiters_count_lock);
cond->waiters_count--;
-
+
/* it's the last waiter or it's a broadcast ? */
is_last_waiter = ((wait_result == WAIT_OBJECT_0 + BROADCAST - 1) && (cond->waiters_count == 0));
-
+
LeaveCriticalSection (& cond->waiters_count_lock);
-
+
/* yes it's the last waiter or it's a broadcast
* only reset the manual event (the automatic event is reset in the WaitForMultipleObjects() function
- * by the system.
+ * by the system.
*/
if (is_last_waiter)
if(!ResetEvent (cond->events[BROADCAST]))
THROW0(system_error,0,"ResetEvent failed");
-
+
/* relock the mutex associated with the condition in accordance with the posix thread specification */
EnterCriticalSection (& mutex->lock);
}
void xbt_os_cond_timedwait(xbt_os_cond_t cond, xbt_os_mutex_t mutex, double delay) {
- THROW_UNIMPLEMENTED;
+
+ unsigned long wait_result = WAIT_TIMEOUT;
+ int is_last_waiter;
+ unsigned long end = (unsigned long)(delay * 1000);
+
+
+ if (delay < 0) {
+ xbt_os_cond_wait(cond,mutex);
+ } else {
+ DEBUG3("xbt_cond_timedwait(%p,%p,%ul)",&(cond->events),&(mutex->lock),end);
+
+ /* lock the threads counter and increment it */
+ EnterCriticalSection (& cond->waiters_count_lock);
+ cond->waiters_count++;
+ LeaveCriticalSection (& cond->waiters_count_lock);
+
+ /* unlock the mutex associate with the condition */
+ LeaveCriticalSection (& mutex->lock);
+ /* wait for a signal (broadcast or no) */
+
+ wait_result = WaitForMultipleObjects (2, cond->events, FALSE, end);
+
+ switch(wait_result) {
+ case WAIT_TIMEOUT:
+ THROW3(timeout_error,GetLastError(),"condition %p (mutex %p) wasn't signaled before timeout (%f)",cond,mutex, delay);
+ case WAIT_FAILED:
+ THROW0(system_error,GetLastError(),"WaitForMultipleObjects failed, so we cannot wait on the condition");
+ }
+
+ /* we have a signal lock the condition */
+ EnterCriticalSection (& cond->waiters_count_lock);
+ cond->waiters_count--;
+
+ /* it's the last waiter or it's a broadcast ? */
+ is_last_waiter = ((wait_result == WAIT_OBJECT_0 + BROADCAST - 1) && (cond->waiters_count == 0));
+
+ LeaveCriticalSection (& cond->waiters_count_lock);
+
+ /* yes it's the last waiter or it's a broadcast
+ * only reset the manual event (the automatic event is reset in the WaitForMultipleObjects() function
+ * by the system.
+ */
+ if (is_last_waiter)
+ if(!ResetEvent (cond->events[BROADCAST]))
+ THROW0(system_error,0,"ResetEvent failed");
+
+ /* relock the mutex associated with the condition in accordance with the posix thread specification */
+ EnterCriticalSection (& mutex->lock);
+ }
+ /*THROW_UNIMPLEMENTED;*/
}
void xbt_os_cond_signal(xbt_os_cond_t cond) {
EnterCriticalSection (& cond->waiters_count_lock);
have_waiters = cond->waiters_count > 0;
LeaveCriticalSection (& cond->waiters_count_lock);
-
+
if (have_waiters)
if(!SetEvent(cond->events[SIGNAL]))
THROW0(system_error,0,"SetEvent failed");
-
+
xbt_os_thread_yield();
}
EnterCriticalSection (& cond->waiters_count_lock);
have_waiters = cond->waiters_count > 0;
LeaveCriticalSection (& cond->waiters_count_lock);
-
+
if (have_waiters)
SetEvent(cond->events[BROADCAST]);
}
void xbt_os_cond_destroy(xbt_os_cond_t cond){
int error = 0;
-
+
if (!cond) return;
-
+
if(!CloseHandle(cond->events[SIGNAL]))
error = 1;
-
+
if(!CloseHandle(cond->events[BROADCAST]))
error = 1;
-
+
DeleteCriticalSection(& cond->waiters_count_lock);
-
+
xbt_free(cond);
-
+
if (error)
THROW0(system_error,0,"Error while destroying the condition");
}
+typedef struct xbt_os_sem_ {
+ HANDLE h;
+ unsigned int value;
+ CRITICAL_SECTION value_lock; /* protect access to value of the semaphore */
+}s_xbt_os_sem_t ;
+
+xbt_os_sem_t
+xbt_os_sem_init(unsigned int value)
+{
+ xbt_os_sem_t res;
+
+ if(value > INT_MAX)
+ THROW1(arg_error,value,"Semaphore initial value too big: %ud cannot be stored as a signed int",value);
+
+ res = (xbt_os_sem_t)xbt_new0(s_xbt_os_sem_t,1);
+
+ if(!(res->h = CreateSemaphore(NULL,value,(long)INT_MAX,NULL))) {
+ THROW1(system_error,GetLastError(),"CreateSemaphore() failed: %s",
+ strerror(GetLastError()));
+ return NULL;
+ }
+
+ res->value = value;
+
+ InitializeCriticalSection(&(res->value_lock));
+
+ return res;
+}
+
+void
+xbt_os_sem_acquire(xbt_os_sem_t sem)
+{
+ if(!sem)
+ THROW0(arg_error,EINVAL,"Cannot acquire the NULL semaphore");
+
+ /* wait failure */
+ if(WAIT_OBJECT_0 != WaitForSingleObject(sem->h,INFINITE))
+ THROW1(system_error,GetLastError(),"WaitForSingleObject() failed: %s",
+ strerror(GetLastError()));
+ EnterCriticalSection(&(sem->value_lock));
+ sem->value--;
+ LeaveCriticalSection(&(sem->value_lock));
+}
+
+void xbt_os_sem_timedacquire(xbt_os_sem_t sem, double timeout)
+{
+ long seconds;
+ long milliseconds;
+ double end = timeout + xbt_os_time();
+
+ if(!sem)
+ THROW0(arg_error,EINVAL,"Cannot acquire the NULL semaphore");
+
+ if (timeout < 0)
+ {
+ xbt_os_sem_acquire(sem);
+ }
+ else /* timeout can be zero <-> try acquire ) */
+ {
+
+ seconds = (long) floor(end);
+ milliseconds = (long)( ( end - seconds) * 1000);
+ milliseconds += (seconds * 1000);
+
+ switch(WaitForSingleObject(sem->h,milliseconds))
+ {
+ case WAIT_OBJECT_0:
+ EnterCriticalSection(&(sem->value_lock));
+ sem->value--;
+ LeaveCriticalSection(&(sem->value_lock));
+ return;
+
+ case WAIT_TIMEOUT:
+ THROW2(timeout_error,GetLastError(),"semaphore %p wasn't signaled before timeout (%f)",sem,timeout);
+ return;
+
+ default:
+ THROW3(system_error,GetLastError(),"WaitForSingleObject(%p,%f) failed: %s",sem,timeout, strerror(GetLastError()));
+ }
+ }
+}
+
+void
+xbt_os_sem_release(xbt_os_sem_t sem)
+{
+ if(!sem)
+ THROW0(arg_error,EINVAL,"Cannot release the NULL semaphore");
+
+ if(!ReleaseSemaphore(sem->h,1, NULL))
+ THROW1(system_error,GetLastError(),"ReleaseSemaphore() failed: %s",
+ strerror(GetLastError()));
+ EnterCriticalSection (&(sem->value_lock));
+ sem->value++;
+ LeaveCriticalSection(&(sem->value_lock));
+}
+
+void
+xbt_os_sem_destroy(xbt_os_sem_t sem)
+{
+ if(!sem)
+ THROW0(arg_error,EINVAL,"Cannot destroy the NULL semaphore");
+
+ if(!CloseHandle(sem->h))
+ THROW1(system_error,GetLastError(),"CloseHandle() failed: %s",
+ strerror(GetLastError()));
+
+ DeleteCriticalSection(&(sem->value_lock));
+
+ xbt_free(sem);
+
+}
+
+void
+xbt_os_sem_get_value(xbt_os_sem_t sem, int* svalue)
+{
+ if(!sem)
+ THROW0(arg_error,EINVAL,"Cannot get the value of the NULL semaphore");
+
+ EnterCriticalSection(&(sem->value_lock));
+ *svalue = sem->value;
+ LeaveCriticalSection(&(sem->value_lock));
+}
+
#endif
