[issue8410] Fix emulated lock to be 'fair'

[Antoine Pitrou]

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

I don't understand why you claim your patched version is fair. As far as I can tell, if you have three threads A, B and C all routinely trying to take this lock, your implementation can perfectly well bounce between A and B without ever giving the lock to C.

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nosy: +pitrou
priority:  -> normal
type:  -> behavior
versions: +Python 3.2 -Python 2.7

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