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

   1 #include "pthread_impl.h"
   2
   3 int pthread_rwlock_tryrdlock(pthread_rwlock_t *rw)
   4 {
   5         a_inc(&rw->__readers);
   6         if (rw->__wrlock) {
   7                 a_dec(&rw->__readers);
   8                 if (rw->__waiters && !rw->__readers)
   9                         __wake(&rw->__readers, 1, 0);
  10                 return EAGAIN;
  11         }
  12         return 0;
  13 }