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| | #include "pthread_impl.h"
int __pthread_rwlock_timedrdlock(pthread_rwlock_t *restrict rw, const struct timespec *restrict at)
{
int r, t;
r = pthread_rwlock_tryrdlock(rw);
if (r != EBUSY) return r;
int spins = 100;
while (spins-- && rw->_rw_lock && !rw->_rw_waiters) a_spin();
while ((r=__pthread_rwlock_tryrdlock(rw))==EBUSY) {
if (!(r=rw->_rw_lock) || (r&0x7fffffff)!=0x7fffffff) continue;
t = r | 0x80000000;
a_inc(&rw->_rw_waiters);
a_cas(&rw->_rw_lock, r, t);
r = __timedwait(&rw->_rw_lock, t, CLOCK_REALTIME, at, rw->_rw_shared^128);
a_dec(&rw->_rw_waiters);
if (r && r != EINTR) return r;
}
return r;
}
weak_alias(__pthread_rwlock_timedrdlock, pthread_rwlock_timedrdlock);
|