1#include "pthread_impl.h"
 2
 3int __pthread_rwlock_timedrdlock(pthread_rwlock_t *restrict rw, const struct timespec *restrict at)
 4{
 5	int r, t;
 6
 7	r = pthread_rwlock_tryrdlock(rw);
 8	if (r != EBUSY) return r;
 9	
10	int spins = 100;
11	while (spins-- && rw->_rw_lock && !rw->_rw_waiters) a_spin();
12
13	while ((r=__pthread_rwlock_tryrdlock(rw))==EBUSY) {
14		if (!(r=rw->_rw_lock) || (r&0x7fffffff)!=0x7fffffff) continue;
15		t = r | 0x80000000;
16		a_inc(&rw->_rw_waiters);
17		a_cas(&rw->_rw_lock, r, t);
18		r = __timedwait(&rw->_rw_lock, t, CLOCK_REALTIME, at, rw->_rw_shared^128);
19		a_dec(&rw->_rw_waiters);
20		if (r && r != EINTR) return r;
21	}
22	return r;
23}
24
25weak_alias(__pthread_rwlock_timedrdlock, pthread_rwlock_timedrdlock);