1#include "pthread_impl.h" 2#include <threads.h> 3 4int __pthread_mutex_trylock(mtx_t *); 5 6int 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(m); 12 switch (ret) { 13 default: return thrd_error; 14 case 0: return thrd_success; 15 case EBUSY: return thrd_busy; 16 } 17} 18