[issue9260] A finer grained import lock

[Antoine Pitrou]

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

> Now, if x and y are executed in separate threads - won't it deadlock?

Well, the patch has a deadlock avoidance mechanism, and it includes unit
tests for precisely this situation.
I cannot promise the algorithm is perfect (although there *are* a bunch
of tests), but it looks correct from here. :)

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<http://bugs.python.org/issue9260>
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