#include <semaphore.h>
#include "pthread_impl.h"
+static void cleanup(void *p)
+{
+ a_dec(p);
+}
+
int sem_timedwait(sem_t *sem, const struct timespec *at)
{
- int val;
+ int r;
+
+ if (a_fetch_add(sem->__val, -1) > 0) return 0;
+ a_inc(sem->__val);
+
+ if (at && at->tv_nsec >= 1000000000UL) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ a_inc(sem->__val+1);
+ pthread_cleanup_push(cleanup, sem->__val+1)
for (;;) {
- if (a_fetch_add(sem->__val, -1) > 0) return 0;
- val = a_fetch_add(sem->__val, 1);
- CANCELPT_BEGIN;
- if (val <= 0 && __timedwait(sem->__val, val, CLOCK_REALTIME, at, 0) == ETIMEDOUT) {
- errno = ETIMEDOUT;
- return -1;
+ r = 0;
+ if (!sem_trywait(sem)) break;
+ r = __timedwait_cp(sem->__val, 0, CLOCK_REALTIME, at, 0);
+ if (r) {
+ errno = r;
+ r = -1;
+ break;
}
- CANCELPT_END;
}
+
+ pthread_cleanup_pop(1);
+
+ return r;
}