- Proper process termination:

if interrupted with CTRL+C blocking socket calls will return with -1. Each device should call FairMQDevice::Shutdown() before ending the running state to close open sockets, otherwise the interrupt call itself will block.

- FIX: Update number of received messages for FairMQFileSink.
- Add ability to poll on outputs for FairMQPoller.

fairmq/devices/FairMQBenchmarkSampler.cxx

@@ -68,12 +68,14 @@ void FairMQBenchmarkSampler::Run()
 
     try {
         rateLogger.interrupt();
-        resetEventCounter.interrupt();
         rateLogger.join();
+        resetEventCounter.interrupt();
         resetEventCounter.join();
     } catch(boost::thread_resource_error& e) {
         LOG(ERROR) << e.what();
     }
+
+    FairMQDevice::Shutdown();
 }
 
 void FairMQBenchmarkSampler::ResetEventCounter()