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File: //usr/lib64/python3.6/site-packages/zmq/sugar/__pycache__/tracker.cpython-36.opt-1.pyc
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    A class for tracking if 0MQ is done using one or more messages.

    When you send a 0MQ message, it is not sent immediately. The 0MQ IO thread
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    actually sent the message though. This is complicated by the fact that
    a single 0MQ message can be sent multiple times using different sockets.
    This class allows you to track all of the 0MQ usages of a message.

    Parameters
    ----------
    towatch : Event, MessageTracker, Message instances.
        This objects to track. This class can track the low-level
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        Create a message tracker to track a set of mesages.

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        Wait for 0MQ to be done with the message or until `timeout`.

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            Maximum time in (s) to wait before raising NotDone.

        Returns
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            if done before `timeout`
        
        Raises
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            if `timeout` reached before I am done.
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