implement robust mutexes

[musl] / src / thread / pthread_mutex_unlock.c

diff --git a/src/thread/pthread_mutex_unlock.c b/src/thread/pthread_mutex_unlock.c
index 3733788..67aa7ba 100644 (file)
--- a/src/thread/pthread_mutex_unlock.c
+++ b/src/thread/pthread_mutex_unlock.c
@@ -2,14 +2,23 @@
 
 int pthread_mutex_unlock(pthread_mutex_t *m)
 {
+       pthread_t self;
+
        if (m->_m_type != PTHREAD_MUTEX_NORMAL) {
-               if (!m->_m_lock || m->_m_lock != __pthread_self()->tid)
+               self = __pthread_self();
+               if ((m->_m_lock&0x1fffffff) != self->tid)
                        return EPERM;
-               if (m->_m_type == PTHREAD_MUTEX_RECURSIVE && --m->_m_count)
+               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;
+               }
        }
 
        m->_m_lock = 0;
        if (m->_m_waiters) __wake(&m->_m_lock, 1, 0);
+       if (m->_m_type >= 4) self->robust_list.pending = 0;
        return 0;
 }