From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Fri, 24 Aug 2012 17:21:49 +0000 (-0400)
Subject: hlist: implement cds_hlist_empty
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=5f1bf1771eb7c512e6b44f9ad1e1c1f55ec0fe97;p=userspace-rcu.git

hlist: implement cds_hlist_empty

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

diff --git a/urcu/hlist.h b/urcu/hlist.h
index d7d5c87..222a59a 100644
--- a/urcu/hlist.h
+++ b/urcu/hlist.h
@@ -39,6 +39,11 @@ static inline void  CDS_INIT_HLIST_HEAD(struct cds_hlist_head *ptr)
 #define cds_hlist_entry(ptr, type, member)					\
 	((type *) ((char *) (ptr) - (unsigned long) (&((type *) 0)->member)))
 
+static inline int cds_hlist_empty(struct cds_hlist_head *head)
+{
+	return !head->next;
+}
+
 /* Add new element at the head of the list.  */
 static inline void cds_hlist_add_head (struct cds_hlist_node *newp,
 				   struct cds_hlist_head *head)