ioloop.py 文件源码

def stop(self):
        """Stop the I/O loop.

        If the event loop is not currently running, the next call to `start()`
        will return immediately.

        To use asynchronous methods from otherwise-synchronous code (such as
        unit tests), you can start and stop the event loop like this::

          ioloop = IOLoop()
          async_method(ioloop=ioloop, callback=ioloop.stop)
          ioloop.start()

        ``ioloop.start()`` will return after ``async_method`` has run
        its callback, whether that callback was invoked before or
        after ``ioloop.start``.

        Note that even after `stop` has been called, the `IOLoop` is not
        completely stopped until `IOLoop.start` has also returned.
        Some work that was scheduled before the call to `stop` may still
        be run before the `IOLoop` shuts down.
        """
        raise NotImplementedError()