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

   1 #include "pthread_impl.h"
   2
   3 int pthread_rwlock_trywrlock(pthread_rwlock_t *rw)
   4 {
   5         if (a_xchg(&rw->__wrlock, 1))
   6                 return EAGAIN;
   7         if (rw->__readers) {
   8                 a_store(&rw->__wrlock, 0);
   9                 return EAGAIN;
  10         }
  11         rw->__owner = pthread_self()->tid;
  12         return 0;
  13 }