1 #include "pthread_impl.h" 2 #include <threads.h> 3 mtx_trylock(mtx_t * m)4int 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