[issue8684] improvements to sched.py

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

I'm not convinced by the decorator approach. Why not simply add "with self.lock" at the beginning of each protected method? It would actually save a function call indirection.

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stage:  -> patch review
versions: +Python 3.3 -Python 3.2

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<http://bugs.python.org/issue8684>
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