+ if (m->_m_waiters) tid |= 0x80000000;
+ self->robust_list.pending = &m->_m_next;
+ }
+ tid |= old & 0x40000000;
+
+ if (a_cas(&m->_m_lock, old, tid) != old) {
+ self->robust_list.pending = 0;
+ if ((type&12)==12 && m->_m_waiters) return ENOTRECOVERABLE;
+ return EBUSY;
+ }
+
+success:
+ if ((type&8) && m->_m_waiters) {
+ int priv = (type & 128) ^ 128;
+ __syscall(SYS_futex, &m->_m_lock, FUTEX_UNLOCK_PI|priv);
+ self->robust_list.pending = 0;
+ return (type&4) ? ENOTRECOVERABLE : EBUSY;
+ }
+
+ volatile void *next = self->robust_list.head;
+ m->_m_next = next;
+ m->_m_prev = &self->robust_list.head;
+ if (next != &self->robust_list.head) *(volatile void *volatile *)
+ ((char *)next - sizeof(void *)) = &m->_m_next;
+ self->robust_list.head = &m->_m_next;
+ self->robust_list.pending = 0;
+
+ if (old) {
+ m->_m_count = 0;
+ return EOWNERDEAD;