[docs] [issue24296] Queue documentation note needed

[Raymond Hettinger]

Raymond Hettinger added the comment:

It is normal for daemon threads to not be shut down.   That is why they exist.  The purpose of Queue.join() is to give other threads a way to know when daemons have finished doing their work (i.e. a print manager thread to indicate that it is done printing).  If the worker threads were actually going to terminate, you wouldn't need Queue.join(), you would use a Thread.join().

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<http://bugs.python.org/issue24296>
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