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#include <semaphore.h>
#include "pthread_impl.h"
int sem_timedwait(sem_t *sem, const struct timespec *at)
{
int val;
for (;;) {
if (a_fetch_add(sem->__val, -1) > 0) return 0;
val = a_fetch_add(sem->__val, 1)+1;
if (val==1) __wake(sem->__val, 1, 0);
if (at && at->tv_nsec >= 1000000000UL) {
errno = EINVAL;
return -1;
}
CANCELPT_BEGIN;
if (val <= 0 && __timedwait(sem->__val, val, CLOCK_REALTIME, at, 0) == ETIMEDOUT) {
errno = ETIMEDOUT;
CANCELPT_TRY;
CANCELPT_END;
return -1;
}
CANCELPT_TRY;
CANCELPT_END;
}
}
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