Runnable main method, perform wait on long-running subtasks

def _run(self):  # pylint: disable=method-hidden
        """ Runnable main method, perform wait on long-running subtasks """
        try:
            self.event_stop.wait()
        except gevent.GreenletExit:  # killed without exception
            self.event_stop.set()
            gevent.killall(self.greenlets)  # kill children
            raise  # re-raise to keep killed status
        except Exception:
            self.stop()  # ensure cleanup and wait on subtasks
            raise