BcastListener: Guard start() w/spinlock for races

commonLibs/livoxProto1/broadcastListener.cpp

@@ -133,10 +133,15 @@ void BroadcastListener::start(void)
 		 * We should also set up a timer to check for devices that have gone
 		 * away.
 		 */
+		{
+			smo::SpinLock::Guard lock(isListeningLock);
+
 			socket.open(boost::asio::ip::udp::v4());
 			socket.bind(listeningEndpoint);
 
 			isListening = true;
+		}
+
 		// Start the first async receive operation
 		startReceive();
 		std::cout << __func__ << ": BroadcastListener started on port "