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urcu lfstack: pop needs rcu read lock
[urcu.git]
/
urcu
/
rculfstack-static.h
diff --git
a/urcu/rculfstack-static.h
b/urcu/rculfstack-static.h
index 8eae35d1bc0d2c9fc12955d6c5185f3bcb1ecfbb..3ce24c55d2ddcf385f9e90006a016b305b557766 100644
(file)
--- a/
urcu/rculfstack-static.h
+++ b/
urcu/rculfstack-static.h
@@
-44,24
+44,19
@@
void _rcu_lfs_init(struct rcu_lfs_stack *s)
void _rcu_lfs_push(struct rcu_lfs_stack *s, struct rcu_lfs_node *node)
{
void _rcu_lfs_push(struct rcu_lfs_stack *s, struct rcu_lfs_node *node)
{
+ struct rcu_lfs_node *head = NULL;
+
for (;;) {
for (;;) {
- struct rcu_lfs_node *head;
+ struct rcu_lfs_node *
old_head =
head;
- rcu_read_lock();
- head = rcu_dereference(s->head);
node->next = head;
/*
* uatomic_cmpxchg() implicit memory barrier orders earlier
* stores to node before publication.
*/
node->next = head;
/*
* uatomic_cmpxchg() implicit memory barrier orders earlier
* stores to node before publication.
*/
- if (uatomic_cmpxchg(&s->head, head, node) == head) {
- rcu_read_unlock();
- return;
- } else {
- /* Failure to prepend. Retry. */
- rcu_read_unlock();
- continue;
- }
+ head = uatomic_cmpxchg(&s->head, old_head, node);
+ if (old_head == head)
+ break;
}
}
}
}
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