int type = m->_m_type & 15;
int priv = (m->_m_type & 128) ^ 128;
int new = 0;
+ int old;
if (type != PTHREAD_MUTEX_NORMAL) {
self = __pthread_self();
- int old = m->_m_lock;
+ old = m->_m_lock;
int own = old & 0x3fffffff;
if (own != self->tid)
return EPERM;
if (next != &self->robust_list.head) *(volatile void *volatile *)
((char *)next - sizeof(void *)) = prev;
}
- cont = a_swap(&m->_m_lock, new);
+ 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);
+ }
+ cont = 0;
+ waiters = 0;
+ } else {
+ cont = a_swap(&m->_m_lock, new);
+ }
if (type != PTHREAD_MUTEX_NORMAL && !priv) {
self->robust_list.pending = 0;
__vm_unlock();