int sem_wait(sem_t * sem) {
if (!sem || *sem == -1) {
errno = EINVAL;
return -1;
}
if (waitone(*sem, INFINITE) < 0) return -1;
return 0;
}
void enter(critsect_t cs) {
tid_t tid = threadid();
if (cs->owner == tid) {
cs->recursion++;
} else {
if (atomic_add(&cs->count, 1) > 0) while (waitone(cs->event, INFINITE) != 0);
cs->owner = tid;
}
}
int sem_trywait(sem_t *sem) {
if (!sem || *sem == -1) {
errno = EINVAL;
return -1;
}
if (waitone(*sem, 0) < 0) {
errno = EAGAIN;
return -1;
}
return 0;
}
int sem_timedwait(sem_t *sem, const struct timespec *abstime) {
struct timeval curtime;
long timeout;
if (!sem || *sem == -1) {
errno = EINVAL;
return -1;
}
if (gettimeofday(&curtime, NULL) < 0) return -1;
timeout = ((long) (abstime->tv_sec - curtime.tv_sec) * 1000L +
(long)((abstime->tv_nsec / 1000) - curtime.tv_usec) / 1000L);
if (timeout < 0) timeout = 0L;
if (waitone(*sem, timeout) < 0) return -1;
return 0;
}
