int pthread_mutex_unlock(pthread_mutex_t *m)
{
if (m->_m_type != PTHREAD_MUTEX_NORMAL) {
- if (m->_m_lock != pthread_self()->tid)
+ if (!m->_m_lock || m->_m_lock != __pthread_self()->tid)
return EPERM;
if (m->_m_type == PTHREAD_MUTEX_RECURSIVE && --m->_m_count)
return 0;