libc-top-half/musl/src/thread/mtx_trylock.c

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