mtx_trylock.c raw

   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  }
  16