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

   1 #include "pthread_impl.h"
   2 #include <threads.h>
   3
   4 int __pthread_mutex_trylock(pthread_mutex_t *);
   5
   6 int mtx_trylock(mtx_t *m)
   7 {
   8         if (m->_m_type == PTHREAD_MUTEX_NORMAL)
   9                 return (a_cas(&m->_m_lock, 0, EBUSY) & EBUSY) ? thrd_busy : thrd_success;
  10
  11         int ret = __pthread_mutex_trylock((pthread_mutex_t *)m);
  12         switch (ret) {
  13         default:    return thrd_error;
  14         case 0:     return thrd_success;
  15         case EBUSY: return thrd_busy;
  16         }
  17 }