int pthread_mutex_lock(pthread_mutex_t *m)
{
- int r;
- while ((r=pthread_mutex_trylock(m)) == EBUSY) {
- if (m->_m_type == PTHREAD_MUTEX_ERRORCHECK
- && m->_m_owner == pthread_self()->tid)
- return EDEADLK;
- __wait(&m->_m_lock, &m->_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);
}