+ __vm_lock();
+ }
+ volatile void *prev = m->_m_prev;
+ volatile void *next = m->_m_next;
+ *(volatile void *volatile *)prev = next;
+ if (next != &self->robust_list.head) *(volatile void *volatile *)
+ ((char *)next - sizeof(void *)) = prev;
+ }
+ if (type&8) {
+ if (old<0 || a_cas(&m->_m_lock, old, new)!=old) {
+ if (new) a_store(&m->_m_waiters, -1);
+ __syscall(SYS_futex, &m->_m_lock, FUTEX_UNLOCK_PI|priv);