termio.py 文件源码

def _timeout_checker(self):
        """
        Runs `timeout_check` and if there are no more non-sticky
        patterns in :attr:`self._patterns`, stops :attr:`scheduler`.
        """
        if not self._checking_patterns:
            self._checking_patterns = True
            remaining_patterns = self.timeout_check()
            if not remaining_patterns:
                # No reason to keep the PeriodicCallback going
                logging.debug("Stopping self.scheduler (no remaining patterns)")
                try:
                    self.scheduler.stop()
                except AttributeError:
                # Now this is a neat trick:  The way IOLoop works with its
                # stack_context thingamabob the scheduler doesn't actualy end up
                # inside the MultiplexPOSIXIOLoop instance inside of this
                # instance of _timeout_checker() *except* inside the main
                # thread.  It is absolutely wacky but it works and works well :)
                    pass
            self._checking_patterns = False