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EVENT_READt EVENT_WRITEc C s� t s t d � � n t | t � sN t | d � r? | g } qN t | � } n t � �] } x | D] } | j | | � qa Wg | j | � D]! } | d | @r� | d j ^ q� SWd QXd S( s� Waits for IO events to be available from a list of sockets
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wait_for_read s c C s t | t | � S( s� Waits for writing to be available from a list of sockets
or optionally a single socket if passed in. Returns a list of
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