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#include "pthread_impl.h"
int pthread_rwlock_timedwrlock(pthread_rwlock_t *rw, const struct timespec *at)
{
int nr, *p, w=0;
while (pthread_rwlock_trywrlock(rw)==EAGAIN) {
if (!w) a_inc(&rw->_rw_waiters), w++;
if ((nr=rw->_rw_readers)) p = &rw->_rw_readers;
else nr=1, p = &rw->_rw_wrlock;
if (__timedwait(p, nr, CLOCK_REALTIME, at, 0)==ETIMEDOUT) {
if (w) a_dec(&rw->_rw_waiters);
return ETIMEDOUT;
}
}
if (w) a_dec(&rw->_rw_waiters);
return 0;
}
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