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 if (rw == NULL) {
6 return EINVAL;
7 }
8 int clock = (rw->_rw_clock == CLOCK_MONOTONIC) ? CLOCK_MONOTONIC : CLOCK_REALTIME;
9 int r, t;
10
11 r = pthread_rwlock_trywrlock(rw);
12 if (r != EBUSY) return r;
13
14 int spins = 100;
15 while (spins-- && rw->_rw_lock && !rw->_rw_waiters) a_spin();
16
17 while ((r=__pthread_rwlock_trywrlock(rw))==EBUSY) {
18 if (!(r=rw->_rw_lock)) continue;
19 t = r | 0x80000000;
20 a_inc(&rw->_rw_waiters);
21 a_cas(&rw->_rw_lock, r, t);
22 r = __timedwait(&rw->_rw_lock, t, clock, at, rw->_rw_shared^128);
23 a_dec(&rw->_rw_waiters);
24 if (r && r != EINTR) return r;
25 }
26 return r;
27 }
28
29 weak_alias(__pthread_rwlock_timedwrlock, pthread_rwlock_timedwrlock);
30