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	int clock = (rw->_rw_clock == CLOCK_MONOTONIC) ? CLOCK_MONOTONIC : CLOCK_REALTIME;
7
8	r = pthread_rwlock_tryrdlock(rw);
9	if (r != EBUSY) return r;
10
11	int spins = 100;
12	while (spins-- && rw->_rw_lock && !rw->_rw_waiters) a_spin();
13
14	while ((r=__pthread_rwlock_tryrdlock(rw))==EBUSY) {
15		if (!(r=rw->_rw_lock) || (r&0x7fffffff)!=0x7fffffff) continue;
16		t = r | 0x80000000;
17		a_inc(&rw->_rw_waiters);
18		a_cas(&rw->_rw_lock, r, t);
19		r = __timedwait(&rw->_rw_lock, t, clock, at, rw->_rw_shared^128);
20		a_dec(&rw->_rw_waiters);
21		if (r && r != EINTR) return r;
22	}
23	return r;
24}
25
26weak_alias(__pthread_rwlock_timedrdlock, pthread_rwlock_timedrdlock);
27