selector_events.py 文件源码

def pause_reading(self):
        # XXX This is a bit icky, given the comment at the top of
        # _read_ready().  Is it possible to evoke a deadlock?  I don't
        # know, although it doesn't look like it; write() will still
        # accept more data for the buffer and eventually the app will
        # call resume_reading() again, and things will flow again.

        if self._closing:
            raise RuntimeError('Cannot pause_reading() when closing')
        if self._paused:
            raise RuntimeError('Already paused')
        self._paused = True
        self._loop.remove_reader(self._sock_fd)
        if self._loop.get_debug():
            logger.debug("%r pauses reading", self)