-typedef struct xbt_os_sem_ {
-#if !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 (macOS), 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
- */
-#if 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("/sg-%d", ++next_sem_ID);
- xbt_os_mutex_release(next_sem_ID_lock);
-
- sem_unlink(res->name);
- 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';
- sem_unlink(res->name);
- 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_wait(sem->ps) < 0)
- THROWF(system_error, errno, "sem_wait() failed: %s", strerror(errno));
-}
-
-void xbt_os_sem_release(xbt_os_sem_t sem)
-{
- 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 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);
-}
-
