Function wait_to_stop_loop

pywebio/platform/tornado.py:360–392

当只剩当前线程和Daemon线程运行时，关闭Server When only the current thread and Daemon thread are running, close the Server

(server)

                logger.debug('ScriptModeSession closed')

    async def wait_to_stop_loop(server):
        """当只剩当前线程和Daemon线程运行时，关闭Server
        When only the current thread and Daemon thread are running, close the Server"""

        # 包括当前线程在内的非Daemon线程数
        # The number of non-Daemon threads(including the current thread)
        alive_none_daemonic_thread_cnt = None
        while alive_none_daemonic_thread_cnt != 1:
            alive_none_daemonic_thread_cnt = sum(
                1 for t in threading.enumerate() if t.is_alive() and not t.isDaemon()
            )
            await asyncio.sleep(0.5)

        if SingleSessionWSHandler.session and SingleSessionWSHandler.session.need_keep_alive():
            while not SingleSessionWSHandler.instance.closed:
                await asyncio.sleep(0.5)

        # 关闭Websocket连接
        # Close the Websocket connection
        if SingleSessionWSHandler.instance:
            SingleSessionWSHandler.instance.close()

        server.stop()
        logger.debug('Closing tornado ioloop...')
        tasks = [t for t in asyncio.all_tasks() if t is not asyncio.current_task() and not t.done()]
        for task in tasks:
            task.cancel()

        # 必须需要 await asyncio.sleep ，否则上方 task.cancel() 调用无法调度生效
        # This line must be required, otherwise the `task.cancel()` call cannot be scheduled to take effect
        await asyncio.sleep(0)

        tornado.ioloop.IOLoop.current().stop()

    def server_thread():
        from tornado.log import access_log, app_log, gen_log