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

[Giampaolo Rodola']

Giampaolo Rodola' <g.rodola at gmail.com> added the comment:

In attachment. 

Before the patch:
9.433167934417725

After the patch:
0.0016150474548339844

scheduler.queue and scheduler.empty should be modified in accordance (which I haven't done, it's just to give you an idea).

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Added file: http://bugs.python.org/file23753/cancel-later-approach.patch

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