- if (a_xchg(&m->_m_lock, 1))
- if (m->_m_type == PTHREAD_MUTEX_ERRORCHECK
- && m->_m_owner == self->tid) return EDEADLK;
- else return EBUSY;
- if (m->_m_type != PTHREAD_MUTEX_NORMAL) {
- m->_m_owner = self->tid;
- m->_m_count = 1;
+ tid = pthread_self()->tid;
+
+ if (m->_m_owner == tid) {
+ if (m->_m_type != PTHREAD_MUTEX_RECURSIVE)
+ return EDEADLK;
+ if ((unsigned)m->_m_count >= INT_MAX) return EAGAIN;
+ m->_m_count++;
+ return 0;