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� Z d S)r aH Abstract base class for monitoring child processes.
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t � � d S)a Register a new child handler.
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t � � d S)z�Attach the watcher to an event loop.
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z-_UnixDefaultEventLoopPolicy.get_child_watcherc C sJ | d k s! t | t � s! t � | j d k r= | j j � | | _ d S)z$Set the watcher for child processes.N)rE r rd r� r% )r r[ r r r �set_child_watcher% s !
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