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- Callbacks registered with add_done_callback() are always called
via the event loop's call_soon().
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methods in the concurrent.futures package.
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zFuture.exceptionr4 c C sB | j tkr | jj|| |d� n |dkr.t�� }| j�||f� dS )z�Add a callback to be run when the future becomes done.
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�zFuture.remove_done_callbackc C s8 | j tkr t�| j � d| ����|| _t| _ | �� dS )z�Mark the future done and set its result.
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a Chain two futures so that when one completes, so does the other.
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