message: Lock event_mutex
diff: @@ -175,7 +175,9 @@ public:
  _event_copy->timestamp = swoole_microtime();
  _event_copy->pipe_fd = SwooleTG.aio_pipe_write;
  _queue.push(_event_copy);
  + event_mutex.lock();
  _cv.notify_one();
  + event_mutex.unlock();
  swDebug("push and notify one: %f", swoole_microtime());
  return _event_copy;
  }
  