1#include "pthread_impl.h"
 2#include <threads.h>
 3
 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}