X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fthread%2Fpthread_mutex_unlock.c;h=b66423e6c34f7ac39cf81a122dba3d83eea46f26;hb=c5f4b2dfea320356f69445dc1adf8f73596a3c36;hp=7dd00d275b6dd9075d5964405ccb3928da1126a1;hpb=384d103d94dba0472a587861f67d7ed6e8955f86;p=musl

diff --git a/src/thread/pthread_mutex_unlock.c b/src/thread/pthread_mutex_unlock.c
index 7dd00d27..b66423e6 100644
--- a/src/thread/pthread_mutex_unlock.c
+++ b/src/thread/pthread_mutex_unlock.c
@@ -7,13 +7,19 @@ int __pthread_mutex_unlock(pthread_mutex_t *m)
 	int cont;
 	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();
-		if ((m->_m_lock&0x7fffffff) != self->tid)
+		old = m->_m_lock;
+		int own = old & 0x3fffffff;
+		if (own != self->tid)
 			return EPERM;
 		if ((type&3) == PTHREAD_MUTEX_RECURSIVE && m->_m_count)
 			return m->_m_count--, 0;
+		if ((type&4) && (old&0x40000000))
+			new = 0x7fffffff;
 		if (!priv) {
 			self->robust_list.pending = &m->_m_next;
 			__vm_lock();
@@ -24,7 +30,16 @@ int __pthread_mutex_unlock(pthread_mutex_t *m)
 		if (next != &self->robust_list.head) *(volatile void *volatile *)
 			((char *)next - sizeof(void *)) = prev;
 	}
-	cont = a_swap(&m->_m_lock, (type & 8) ? 0x7fffffff : 0);
+	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();