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

   1 #include "pthread_impl.h"
   2
   3 int pthread_rwlock_timedwrlock(pthread_rwlock_t *rw, const struct timespec *at)
   4 {
   5         int nr, *p, w=0;
   6         while (pthread_rwlock_trywrlock(rw)==EAGAIN) {
   7                 if (!w) a_inc(&rw->_rw_waiters), w++;
   8                 if ((nr=rw->_rw_readers)) p = &rw->_rw_readers;
   9                 else nr=1, p = &rw->_rw_wrlock;
  10                 if (__timedwait(p, nr, CLOCK_REALTIME, at, 0)==ETIMEDOUT) {
  11                         if (w) a_dec(&rw->_rw_waiters);
  12                         return ETIMEDOUT;
  13                 }
  14         }
  15         if (w) a_dec(&rw->_rw_waiters);
  16         return 0;
  17 }