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#include "pthread_impl.h"
#include <threads.h>
int __pthread_mutex_trylock(mtx_t *);
int mtx_trylock(mtx_t *m)
{
if (m->_m_type == PTHREAD_MUTEX_NORMAL)
return (a_cas(&m->_m_lock, 0, EBUSY) & EBUSY) ? thrd_busy : thrd_success;
int ret = __pthread_mutex_trylock(m);
switch (ret) {
default: return thrd_error;
case 0: return thrd_success;
case EBUSY: return thrd_busy;
}
}
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