nsz Git - musl/blob - src/thread/pthread_rwlock_timedrdlock.c

   1 #include "pthread_impl.h"
   2
   3 int pthread_rwlock_timedrdlock(pthread_rwlock_t *rw, const struct timespec *at)
   4 {
   5         int r, t;
   6         while ((r=pthread_rwlock_tryrdlock(rw))==EBUSY) {
   7                 if (!(r=rw->_rw_lock) || (r&0x7fffffff)!=0x7fffffff) continue;
   8                 t = r | 0x80000000;
   9                 a_inc(&rw->_rw_waiters);
  10                 a_cas(&rw->_rw_lock, r, t);
  11                 r = __timedwait(&rw->_rw_lock, t, CLOCK_REALTIME, at, 0, 0, 0);
  12                 a_dec(&rw->_rw_waiters);
  13                 if (r && r != EINTR) return r;
  14         }
  15         return r;
  16 }