[issue29603] More informative Queue class: new method that returns number of unfinished tasks

[slytomcat]

slytomcat added the comment:

Not exactly.... there are 3 cases:

If qsize <> 0 it means there is no idle consumers threads, all of them must be busy: we need to create one more. No doubt.

If qsize = 0 it means one of two cases: 
- all consumers threads are busy: we need to create one more
- some or all consumers threads are idle: no need create new one.

But there is no way to distinguish two last cases.

That's why I consider that (unfinished() <= num_threads) gives clear key for decision.

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<http://bugs.python.org/issue29603>
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