int pthread_mutex_unlock(pthread_mutex_t *m)
{
- if (m->_m_type == PTHREAD_MUTEX_RECURSIVE) {
- if (a_fetch_add(&m->_m_lock, -1)==1 && m->_m_waiters)
- __wake(&m->_m_lock, 1, 0);
- return 0;
- }
-
- if (m->_m_type == PTHREAD_MUTEX_ERRORCHECK
- && m->_m_owner != pthread_self()->tid)
- return EPERM;
+ pthread_t self;
+ int waiters = m->_m_waiters;
+ int cont;
- m->_m_owner = 0;
- m->_m_lock = 0;
- if (m->_m_waiters) __wake(&m->_m_lock, 1, 0);
+ if (m->_m_type != PTHREAD_MUTEX_NORMAL) {
+ if (!m->_m_lock)
+ return EPERM;
+ self = __pthread_self();
+ if ((m->_m_lock&0x1fffffff) != self->tid)
+ return EPERM;
+ if ((m->_m_type&3) == PTHREAD_MUTEX_RECURSIVE && --m->_m_count)
+ return 0;
+ if (m->_m_type >= 4) {
+ self->robust_list.pending = &m->_m_next;
+ *(void **)m->_m_prev = m->_m_next;
+ if (m->_m_next) ((void **)m->_m_next)[-1] = m->_m_prev;
+ cont = a_swap(&m->_m_lock, 0);
+ self->robust_list.pending = 0;
+ goto wake;
+ }
+ }
+ cont = a_swap(&m->_m_lock, 0);
+wake:
+ if (waiters || cont<0)
+ __wake(&m->_m_lock, 1, 0);
return 0;
}