Wait for a socket event. Posssible *event* values are the strings
        "recv", "send" and "acks". Whent the timeout is present and
        not :const:`None`, it should be a floating point number
        specifying the timeout for the operation in seconds (or
        fractions thereof). For "recv" or "send" the :meth:`poll`
        method returns :const:`True` if a next :meth:`recv` or
        :meth:`send` operation would be non-blocking. The "acks" event
        may only be used with a data-link-connection type socket; the
        call then returns :const:`True` if the counter of received
        acknowledgements was greater than zero and decrements the
        counter by one.

def poll(self, event, timeout=None):
        """Wait for a socket event. Posssible *event* values are the strings
        "recv", "send" and "acks". Whent the timeout is present and
        not :const:`None`, it should be a floating point number
        specifying the timeout for the operation in seconds (or
        fractions thereof). For "recv" or "send" the :meth:`poll`
        method returns :const:`True` if a next :meth:`recv` or
        :meth:`send` operation would be non-blocking. The "acks" event
        may only be used with a data-link-connection type socket; the
        call then returns :const:`True` if the counter of received
        acknowledgements was greater than zero and decrements the
        counter by one.

        """
        return self.llc.poll(self._tco, event, timeout)