Use get_packet_no_wait and a sleep so that if told to close we give u…

…p on getting a packet

src/zm_event.cpp

@@ -686,7 +686,7 @@ void Event::Run() {
   // The idea is to process the queue no matter what so that all packets get processed.
   // We only break if the queue is empty
   while (!terminate_ and !zm_terminate) {
-    ZMLockedPacket *packet_lock = packetqueue->get_packet(packetqueue_it);
+    ZMLockedPacket *packet_lock = packetqueue->get_packet_no_wait(packetqueue_it);
     if (packet_lock) {
       std::shared_ptr<ZMPacket> packet = packet_lock->packet_;
       if (!packet->decoded) {
@@ -721,7 +721,8 @@ void Event::Run() {
       // Important not to increment it until after we are done with the packet because clearPackets checks for iterators pointing to it.
       packetqueue->increment_it(packetqueue_it);
     } else {
-      return;
+      if (terminate_ or zm_terminate) return;
+      usleep(10000);
     } // end if packet_lock
   }  // end while
 }  // end Run()