[#880] Added a guard on the exported empty method

diff --git a/src/lib/dhcp/packet_queue_ring.h b/src/lib/dhcp/packet_queue_ring.h
index a4b4ad145f7a8b54a7aef93ff2688aaa8fffbd4c..b2a6b39b075fe4b30c59b4a5650b24ebcc6e9220 100644 (file)
--- a/src/lib/dhcp/packet_queue_ring.h
+++ b/src/lib/dhcp/packet_queue_ring.h
@@ -164,6 +164,7 @@ public:
 
     /// @brief Returns True if the queue is empty.
     virtual bool empty() const {
+        std::lock_guard<std::mutex> lock(*mutex_);
         return(queue_.empty());
     }