[issue10260] Add a threading.Condition.wait_for() method

[Kristján Valur Jónsson]

Kristján Valur Jónsson <kristjan at ccpgames.com> added the comment:

The wait_for() method is basically a distillation of the Semaphore.acquire() method, which tries to intelligently handle a non-trivial timeout.
With this method it is now possible to simplify Semaphore.acquire, although I didn't want to do so in this patch to keep its scope smaller.

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<http://bugs.python.org/issue10260>
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