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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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a single 0MQ message can be sent multiple times using different sockets.
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towatch : Event, MessageTracker, Message instances.
This objects to track. This class can track the low-level
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timeout : float [default: -1, wait forever]
Maximum time in (s) to wait before raising NotDone.
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None
if done before `timeout`
Raises
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NotDone
if `timeout` reached before I am done.
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