From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Sun, 26 Aug 2012 00:57:24 +0000 (-0400)
Subject: hlist: implement non-entry API
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=9e562872c077f9febf0781546a87a4fe5894415e;p=urcu.git

hlist: implement non-entry API

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/urcu/rcuhlist.h b/urcu/rcuhlist.h
index 4635593..06359d5 100644
--- a/urcu/rcuhlist.h
+++ b/urcu/rcuhlist.h
@@ -50,14 +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, member)				\
+	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) \
+#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, member)			\
+	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.
  */