-
-/***** condition related functions *****/
-typedef struct xbt_os_cond_ {
- /* KEEP IT IN SYNC WITH xbt_thread.c */
- pthread_cond_t c;
-} s_xbt_os_cond_t;
-
-xbt_os_cond_t xbt_os_cond_init(void)
-{
- xbt_os_cond_t res = xbt_new(s_xbt_os_cond_t, 1);
- int errcode;
- if ((errcode = pthread_cond_init(&(res->c), NULL)))
- THROWF(system_error, errcode, "pthread_cond_init() failed: %s",
- strerror(errcode));
-
- return res;
-}
-
-void xbt_os_cond_wait(xbt_os_cond_t cond, xbt_os_mutex_t mutex)
-{
- int errcode;
- if ((errcode = pthread_cond_wait(&(cond->c), &(mutex->m))))
- THROWF(system_error, errcode, "pthread_cond_wait(%p,%p) failed: %s",
- cond, mutex, strerror(errcode));
-}
-
-
-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 {
- ts_end.tv_sec = (time_t) floor(end);
- ts_end.tv_nsec = (long) ((end - ts_end.tv_sec) * 1000000000);
- XBT_DEBUG("pthread_cond_timedwait(%p,%p,%p)", &(cond->c), &(mutex->m),
- &ts_end);
- switch ((errcode =
- pthread_cond_timedwait(&(cond->c), &(mutex->m), &ts_end))) {
- case 0:
- return;
- case ETIMEDOUT:
- THROWF(timeout_error, errcode,
- "condition %p (mutex %p) wasn't signaled before timeout (%f)",
- cond, mutex, delay);
- default:
- THROWF(system_error, errcode,
- "pthread_cond_timedwait(%p,%p,%f) failed: %s", cond, mutex,
- delay, strerror(errcode));
- }
- }
-}
-
-void xbt_os_cond_signal(xbt_os_cond_t cond)
-{
- int errcode;
- if ((errcode = pthread_cond_signal(&(cond->c))))
- THROWF(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))))
- THROWF(system_error, errcode, "pthread_cond_broadcast(%p) failed: %s",
- cond, strerror(errcode));
-}
-
-void xbt_os_cond_destroy(xbt_os_cond_t cond)
-{
- int errcode;
-
- if (!cond)
- return;
-
- if ((errcode = pthread_cond_destroy(&(cond->c))))
- THROWF(system_error, errcode, "pthread_cond_destroy(%p) failed: %s",
- cond, strerror(errcode));
- free(cond);
-}
-
-void *xbt_os_thread_getparam(void)
-{
- xbt_os_thread_t t = xbt_os_thread_self();
- return t ? t->param : NULL;
-}
-
-typedef struct xbt_os_sem_ {
-#ifndef HAVE_SEM_INIT
- char *name;
-#endif
- sem_t s;
- sem_t *ps;
-} s_xbt_os_sem_t;
-
-#ifndef SEM_FAILED
-#define SEM_FAILED (-1)
-#endif
-
-xbt_os_sem_t xbt_os_sem_init(unsigned int value)
-{
- xbt_os_sem_t res = xbt_new(s_xbt_os_sem_t, 1);
-
- /* On some systems (MAC OS X), only the stub of sem_init is to be found.
- * Any attempt to use it leads to ENOSYS (function not implemented).
- * If such a prehistoric system is detected, do the job with sem_open instead
- */
-#ifdef HAVE_SEM_INIT
- if (sem_init(&(res->s), 0, value) != 0)
- THROWF(system_error, errno, "sem_init() failed: %s", strerror(errno));
- res->ps = &(res->s);
-
-#else /* damn, no sem_init(). Reimplement it */
-
- xbt_os_mutex_acquire(next_sem_ID_lock);
- res->name = bprintf("/%d", ++next_sem_ID);
- xbt_os_mutex_release(next_sem_ID_lock);
-
- res->ps = sem_open(res->name, O_CREAT, 0644, value);
- if ((res->ps == (sem_t *) SEM_FAILED) && (errno == ENAMETOOLONG)) {
- /* Old darwins only allow 13 chars. Did you create *that* amount of semaphores? */
- res->name[13] = '\0';
- res->ps = sem_open(res->name, O_CREAT, 0644, value);
- }
- if (res->ps == (sem_t *) SEM_FAILED)
- THROWF(system_error, errno, "sem_open() failed: %s", strerror(errno));
-
- /* Remove the name from the semaphore namespace: we never join on it */
- if (sem_unlink(res->name) < 0)
- THROWF(system_error, errno, "sem_unlink() failed: %s",
- strerror(errno));
-
-#endif
-
- return res;
-}
-
-void xbt_os_sem_acquire(xbt_os_sem_t sem)
-{
- if (!sem)
- THROWF(arg_error, EINVAL, "Cannot acquire of the NULL semaphore");
- if (sem_wait(sem->ps) < 0)
- THROWF(system_error, errno, "sem_wait() failed: %s", strerror(errno));
-}
-
-void xbt_os_sem_timedacquire(xbt_os_sem_t sem, double delay)
-{
- int errcode;
-
- if (!sem)
- THROWF(arg_error, EINVAL, "Cannot acquire of the NULL semaphore");
-
- if (delay < 0) {
- xbt_os_sem_acquire(sem);
- } else if (delay == 0) {
- errcode = sem_trywait(sem->ps);
-
- switch (errcode) {
- case 0:
- return;
- case ETIMEDOUT:
- THROWF(timeout_error, 0, "semaphore %p not ready", sem);
- default:
- THROWF(system_error, errcode,
- "xbt_os_sem_timedacquire(%p) failed: %s", sem,
- strerror(errcode));
- }
-
- } else {
-#ifdef HAVE_SEM_WAIT
- struct timespec ts_end;
- double end = delay + xbt_os_time();
-
- ts_end.tv_sec = (time_t) floor(end);
- ts_end.tv_nsec = (long) ((end - ts_end.tv_sec) * 1000000000);
- XBT_DEBUG("sem_timedwait(%p,%p)", sem->ps, &ts_end);
- errcode = sem_timedwait(sem->s, &ts_end);
-
-#else /* Okay, reimplement this function then */
- double start = xbt_os_time();
- do {
- errcode = sem_trywait(sem->ps);
- if (errcode == EBUSY)
- xbt_os_thread_yield();
- } while (errcode == EBUSY && xbt_os_time() - start < delay);
-
- if (errcode == EBUSY)
- errcode = ETIMEDOUT;
-#endif
-
- switch (errcode) {
- case 0:
- return;
-
- case ETIMEDOUT:
- THROWF(timeout_error, delay,
- "semaphore %p wasn't signaled before timeout (%f)", sem,
- delay);
-
- default:
- THROWF(system_error, errcode, "sem_timedwait(%p,%f) failed: %s", sem,
- delay, strerror(errcode));
- }
- }
-}
-
-void xbt_os_sem_release(xbt_os_sem_t sem)
-{
- if (!sem)
- THROWF(arg_error, EINVAL, "Cannot release of the NULL semaphore");
-
- if (sem_post(sem->ps) < 0)
- THROWF(system_error, errno, "sem_post() failed: %s", strerror(errno));
-}
-
-void xbt_os_sem_destroy(xbt_os_sem_t sem)
-{
- if (!sem)
- THROWF(arg_error, EINVAL, "Cannot destroy the NULL sempahore");
-
-#ifdef HAVE_SEM_INIT
- if (sem_destroy(sem->ps) < 0)
- THROWF(system_error, errno, "sem_destroy() failed: %s",
- strerror(errno));
-#else
- if (sem_close(sem->ps) < 0)
- THROWF(system_error, errno, "sem_close() failed: %s", strerror(errno));
- xbt_free(sem->name);
-
-#endif
- xbt_free(sem);
-}
-
-void xbt_os_sem_get_value(xbt_os_sem_t sem, int *svalue)
-{
- if (!sem)
- THROWF(arg_error, EINVAL,
- "Cannot get the value of the NULL semaphore");
-
- if (sem_getvalue(&(sem->s), svalue) < 0)
- THROWF(system_error, errno, "sem_getvalue() failed: %s",
- strerror(errno));
-}
-
-
-/** @brief Returns the amount of cores on the current host */
-int xbt_os_get_numcores(void) {
-#ifdef WIN32
- SYSTEM_INFO sysinfo;
- GetSystemInfo(&sysinfo);
- return sysinfo.dwNumberOfProcessors;
-#elif defined(__APPLE__) && defined(__MACH__)
- int nm[2];
- size_t len = 4;
- uint32_t count;
-
- nm[0] = CTL_HW; nm[1] = HW_AVAILCPU;
- sysctl(nm, 2, &count, &len, NULL, 0);
-
- if(count < 1) {
- nm[1] = HW_NCPU;
- sysctl(nm, 2, &count, &len, NULL, 0);
- if(count < 1) { count = 1; }
- }
- return count;
-#else
- return sysconf(_SC_NPROCESSORS_ONLN);
-#endif
-}
-
-
-/***** reentrant mutexes *****/
-typedef struct xbt_os_rmutex_ {
- xbt_os_mutex_t mutex;
- xbt_os_thread_t owner;
- int count;
-} s_xbt_os_rmutex_t;
-
-void xbt_os_thread_set_extra_data(void *data)
-{
- xbt_os_thread_self()->extra_data = data;
-}
-
-void *xbt_os_thread_get_extra_data(void)
-{
- xbt_os_thread_t thread = xbt_os_thread_self();
- if (thread)
- return xbt_os_thread_self()->extra_data;
- else
- return NULL;
-}
-
-xbt_os_rmutex_t xbt_os_rmutex_init(void)
-{
- xbt_os_rmutex_t rmutex = xbt_new0(struct xbt_os_rmutex_, 1);
- rmutex->mutex = xbt_os_mutex_init();
- rmutex->owner = NULL;
- rmutex->count = 0;
- return rmutex;
-}
-
-void xbt_os_rmutex_acquire(xbt_os_rmutex_t rmutex)
-{
- xbt_os_thread_t self = xbt_os_thread_self();
-
- if (self == NULL) {
- /* the thread module is not initialized yet */
- rmutex->owner = NULL;
- return;
- }
-
- if (self != rmutex->owner) {
- xbt_os_mutex_acquire(rmutex->mutex);
- rmutex->owner = self;
- rmutex->count = 1;
- } else {
- rmutex->count++;
- }
-}
-
-void xbt_os_rmutex_release(xbt_os_rmutex_t rmutex)
-{
- if (rmutex->owner == NULL) {
- /* the thread module was not initialized */
- return;
- }
-
- xbt_assert(rmutex->owner == xbt_os_thread_self());
-
- if (--rmutex->count == 0) {
- rmutex->owner = NULL;
- xbt_os_mutex_release(rmutex->mutex);
- }
-}
-
-void xbt_os_rmutex_destroy(xbt_os_rmutex_t rmutex)
-{
- xbt_os_mutex_destroy(rmutex->mutex);
- xbt_free(rmutex);
-}