Method _check_running

Lib/asyncio/base_events.py:634–639

(self)

                self.call_soon_threadsafe(future.set_exception, ex)

    def _check_running(self):
        if self.is_running():
            raise RuntimeError('This event loop is already running')
        if events._get_running_loop() is not None:
            raise RuntimeError(
                'Cannot run the event loop while another loop is running')

    def _run_forever_setup(self):
        """Prepare the run loop to process events.