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#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 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 (;;) {
r = 0;
if (!sem_trywait(sem)) break;
r = __timedwait_cp(sem->__val, 0, CLOCK_REALTIME, at, 0);
if (r) {
errno = r;
r = -1;
break;
}
}
pthread_cleanup_pop(1);
return r;
}
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