queue: New function queue_is_empty().

diff --git a/lib/queue.h b/lib/queue.h
index e94d20c468488e4d4d28661d088bbf516afed6e4..879f7a2d16ca5734679d30f9a9171185839385fd 100644 (file)
--- a/lib/queue.h
+++ b/lib/queue.h
@@ -17,6 +17,8 @@
 #ifndef QUEUE_H
 #define QUEUE_H 1
 
+#include <stdbool.h>
+
 /* Packet queue. */
 struct ovs_queue {
     int n;                      /* Number of queued packets. */
@@ -31,4 +33,9 @@ void queue_advance_head(struct ovs_queue *, struct ofpbuf *next);
 void queue_push_tail(struct ovs_queue *, struct ofpbuf *);
 struct ofpbuf *queue_pop_head(struct ovs_queue *);
 
+static inline bool queue_is_empty(const struct ovs_queue *q)
+{
+    return q->n == 0;
+}
+
 #endif /* queue.h */