[issue15124] _thread.LockType: Optimize lock deletion, acquisition of uncontested lock and release of lock.

[Kristján Valur Jónsson]

Changes by Kristján Valur Jónsson <kristjan at ccpgames.com>:


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stage:  -> committed/rejected

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15124>
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