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