#include "pthread_impl.h"
-int pthread_mutex_unlock(pthread_mutex_t *m)
+int __pthread_mutex_unlock(pthread_mutex_t *m)
{
pthread_t self;
int waiters = m->_m_waiters;
int cont;
- int robust = 0;
+ int type = m->_m_type & 15;
+ int priv = (m->_m_type & 128) ^ 128;
+ int new = 0;
+ int old;
- if (m->_m_type != PTHREAD_MUTEX_NORMAL) {
- if (!m->_m_lock)
+ if (type != PTHREAD_MUTEX_NORMAL) {
+ self = __pthread_self();
+ old = m->_m_lock;
+ int own = old & 0x3fffffff;
+ if (own != self->tid)
return EPERM;
- self = pthread_self();
- if ((m->_m_lock&0x1fffffff) != self->tid)
- return EPERM;
- if ((m->_m_type&3) == PTHREAD_MUTEX_RECURSIVE && m->_m_count)
+ if ((type&3) == PTHREAD_MUTEX_RECURSIVE && m->_m_count)
return m->_m_count--, 0;
- if (m->_m_type >= 4) {
- robust = 1;
+ if ((type&4) && (old&0x40000000))
+ new = 0x7fffffff;
+ if (!priv) {
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;
+ __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);
}
+ cont = 0;
+ waiters = 0;
+ } else {
+ cont = a_swap(&m->_m_lock, new);
}
- cont = a_swap(&m->_m_lock, 0);
- if (robust)
+ if (type != PTHREAD_MUTEX_NORMAL && !priv) {
self->robust_list.pending = 0;
+ __vm_unlock();
+ }
if (waiters || cont<0)
- __wake(&m->_m_lock, 1, 0);
+ __wake(&m->_m_lock, 1, priv);
return 0;
}
+
+weak_alias(__pthread_mutex_unlock, pthread_mutex_unlock);