X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=urcu%2Frcuhlist.h;h=1dcbdb4eecbc35207ba85c8c47af7a49d82f1f9f;hb=c76c77cb74e78ee5916ca7a86d0b164124d62337;hp=8549550e7fab3358fd031b30ed87ff67244f1472;hpb=bdffa73aa208ad5f1e5b3a3cb6cbf86ac6996559;p=userspace-rcu.git

diff --git a/urcu/rcuhlist.h b/urcu/rcuhlist.h
index 8549550..1dcbdb4 100644
--- a/urcu/rcuhlist.h
+++ b/urcu/rcuhlist.h
@@ -50,8 +50,32 @@ static inline void cds_hlist_del_rcu(struct cds_hlist_node *elem)
 	elem->prev->next = elem->next;
 }
 
+/*
+ * Get first element from a RCU hlist. Assumes the hlist is not empty.
+ * This must be done while rcu_read_lock() is held.
+ */
+#define cds_hlist_first_rcu(ptr, type)					\
+	rcu_dereference((ptr)->next)
+
+/*
+ * Get first entry from a RCU hlist. Assumes the hlist is not empty.
+ * This must be done while rcu_read_lock() is held.
+ */
+#define cds_hlist_first_entry_rcu(ptr, type, member)			\
+	cds_hlist_entry(rcu_dereference((ptr)->next), type, member)
 
-/* Iterate through elements of the list.
+/*
+ * Iterate through nodes of the list.
+ * This must be done while rcu_read_lock() is held.
+ */
+
+#define cds_hlist_for_each_rcu(pos, head)				\
+	for (pos = rcu_dereference((head)->next);			\
+	     pos != NULL;						\
+	     pos = rcu_dereference((pos)->next))
+
+/*
+ * Iterate through elements of the list.
  * This must be done while rcu_read_lock() is held.
  */