Now we can safely stop waiting for tasks when shutdown is closed

satan.go

@@ -117,12 +117,8 @@ func (s *Satan) runWorker(i int) {
 		select {
 		case t := <-s.queue:
 			s.processTask(t)
-		default:
-			select {
 		case <-s.shutdownWorkers:
 			return
-			default:
-			}
 		}
 	}
 }