http_server.py 文件源码

def safe_shutdown(self, timeout):
        if self._shutting_down:
            return

        self._shutting_down = True
        logging.debug('Stopping http server.')
        self.stop()

        logging.debug('Will be shutdown within %s seconds ...', timeout)
        io_loop = tornado.ioloop.IOLoop.instance()

        deadline = time.time() + timeout

        def safe_stop_loop():
            now = time.time()
            if now < deadline and io_loop._callbacks:
                io_loop.add_timeout(now + 1, safe_stop_loop)
            else:
                io_loop.stop()
                logging.debug('Http server has been shutdown.')
        safe_stop_loop()