1 #include "pthread_impl.h"
2
__pthread_rwlock_timedwrlock(pthread_rwlock_t * restrict rw,const struct timespec * restrict at)3 int __pthread_rwlock_timedwrlock(pthread_rwlock_t *restrict rw, const struct timespec *restrict at)
4 {
5 int r, t;
6
7 r = pthread_rwlock_trywrlock(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_trywrlock(rw))==EBUSY) {
14 if (!(r=rw->_rw_lock)) 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
25 weak_alias(__pthread_rwlock_timedwrlock, pthread_rwlock_timedwrlock);
26