poll.py 文件源码

def poll(self, timeout=None):
        """Poll the registered 0MQ or native fds for I/O.

        Parameters
        ----------
        timeout : float, int
            The timeout in milliseconds. If None, no `timeout` (infinite). This
            is in milliseconds to be compatible with ``select.poll()``. The
            underlying zmq_poll uses microseconds and we convert to that in
            this function.

        Returns
        -------
        events : list of tuples
            The list of events that are ready to be processed.
            This is a list of tuples of the form ``(socket, event)``, where the 0MQ Socket
            or integer fd is the first element, and the poll event mask (POLLIN, POLLOUT) is the second.
            It is common to call ``events = dict(poller.poll())``,
            which turns the list of tuples into a mapping of ``socket : event``.
        """
        if timeout is None or timeout < 0:
            timeout = -1
        elif isinstance(timeout, float):
            timeout = int(timeout)
        return zmq_poll(self.sockets, timeout=timeout)