int pthread_mutex_lock(pthread_mutex_t *m)
{
- int r;
- while ((r=pthread_mutex_trylock(m)) == EBUSY)
- __wait(&m->__lock, &m->__waiters, 1, 0);
- return r;
+ if (m->_m_type == PTHREAD_MUTEX_NORMAL && !a_cas(&m->_m_lock, 0, EBUSY))
+ return 0;
+
+ return pthread_mutex_timedlock(m, 0);
}