From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Mon, 5 Sep 2011 00:07:41 +0000 (-0400)
Subject: Add cds_list_empty
X-Git-Tag: v0.6.5~33
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=4b7cab77f3c1c03f021cb0f7e8d150eed3f948e9;p=userspace-rcu.git

Add cds_list_empty

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

diff --git a/urcu/list.h b/urcu/list.h
index 04dad80..bb50128 100644
--- a/urcu/list.h
+++ b/urcu/list.h
@@ -37,7 +37,6 @@ struct cds_list_head
   struct cds_list_head *prev;
 };
 
-
 /* Define a variable with the head and tail of the list.  */
 #define CDS_LIST_HEAD(name) \
   struct cds_list_head name = { &(name), &(name) }
@@ -126,14 +125,21 @@ cds_list_splice (struct cds_list_head *add, struct cds_list_head *head)
     }
 }
 
+/* Returns 1 if list is empty, 0 otherwise */
+static inline
+int cds_list_empty(struct cds_list_head *head)
+{
+	return head->next == head->prev;
+}
+
 /* Get typed element from list at a given position.  */
 #define cds_list_entry(ptr, type, member) \
   ((type *) ((char *) (ptr) - (unsigned long) (&((type *) 0)->member)))
 
 
 /* Get first entry from a list. */
-#define cds_list_first_entry(ptr, type, member) \
-	cds_list_entry((ptr)->next, type, member)
+#define cds_list_first_entry(head, type, member) \
+	cds_list_entry((head)->next, type, member)
 
 
 /* Iterate forward over the elements of the list.  */