[issue13451] sched.py: speedup cancel() method

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


Removed file: http://bugs.python.org/file32280/cancel_4a.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13451>
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