1 #include "pthread_impl.h"
3 int __pthread_mutex_unlock(pthread_mutex_t *m)
6 int waiters = m->_m_waiters;
8 int type = m->_m_type & 15;
9 int priv = (m->_m_type & 128) ^ 128;
13 if (type != PTHREAD_MUTEX_NORMAL) {
14 self = __pthread_self();
16 int own = old & 0x3fffffff;
19 if ((type&3) == PTHREAD_MUTEX_RECURSIVE && m->_m_count)
20 return m->_m_count--, 0;
21 if ((type&4) && (old&0x40000000))
24 self->robust_list.pending = &m->_m_next;
27 volatile void *prev = m->_m_prev;
28 volatile void *next = m->_m_next;
29 *(volatile void *volatile *)prev = next;
30 if (next != &self->robust_list.head) *(volatile void *volatile *)
31 ((char *)next - sizeof(void *)) = prev;
34 if (old<0 || a_cas(&m->_m_lock, old, new)!=old) {
35 if (new) a_store(&m->_m_waiters, -1);
36 __syscall(SYS_futex, &m->_m_lock, FUTEX_UNLOCK_PI|priv);
41 cont = a_swap(&m->_m_lock, new);
43 if (type != PTHREAD_MUTEX_NORMAL && !priv) {
44 self->robust_list.pending = 0;
47 if (waiters || cont<0)
48 __wake(&m->_m_lock, 1, priv);
52 weak_alias(__pthread_mutex_unlock, pthread_mutex_unlock);