int tid;
if (m->_m_type == PTHREAD_MUTEX_NORMAL)
- return -a_xchg(&m->_m_lock, 1) & EBUSY;
+ return (m->_m_lock || a_swap(&m->_m_lock, 1)) ? EBUSY : 0;
tid = pthread_self()->tid;
- if (m->_m_owner == tid) {
- if (m->_m_type != PTHREAD_MUTEX_RECURSIVE)
- return EDEADLK;
+ if (m->_m_owner == tid && m->_m_type == PTHREAD_MUTEX_RECURSIVE) {
if ((unsigned)m->_m_count >= INT_MAX) return EAGAIN;
m->_m_count++;
return 0;
}
- if (a_xchg(&m->_m_lock, 1)) return EBUSY;
+ if (m->_m_owner || a_xchg(&m->_m_lock, 1)) return EBUSY;
m->_m_owner = tid;
m->_m_count = 1;
return 0;