1#include "pthread_impl.h" 2 3int pthread_rwlock_timedrdlock(pthread_rwlock_t *restrict rw, const struct timespec *restrict at) 4{ 5 int r, t; 6 7 r = pthread_rwlock_tryrdlock(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_tryrdlock(rw))==EBUSY) { 14 if (!(r=rw->_rw_lock) || (r&0x7fffffff)!=0x7fffffff) 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