1 #include "pthread_impl.h"
2
__pthread_rwlock_timedrdlock(pthread_rwlock_t *restrict rw, const struct timespec *restrict at)3 int __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
26 weak_alias(__pthread_rwlock_timedrdlock, pthread_rwlock_timedrdlock);
27