#include "pthread_impl.h"
-int pthread_rwlock_timedrdlock(pthread_rwlock_t *rw, const struct timespec *at)
+int __pthread_rwlock_timedrdlock(pthread_rwlock_t *restrict rw, const struct timespec *restrict at)
{
- int w=0;
- while (pthread_rwlock_tryrdlock(rw)) {
- if (!w) a_inc(&rw->__waiters), w++;
- if (__timedwait(&rw->__wrlock, 1, CLOCK_REALTIME, at, 0)==ETIMEDOUT) {
- if (w) a_dec(&rw->__waiters);
- return ETIMEDOUT;
- }
+ 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;
}
- if (w) a_dec(&rw->__waiters);
- return 0;
+ return r;
}
+
+weak_alias(__pthread_rwlock_timedrdlock, pthread_rwlock_timedrdlock);