[issue9260] A finer grained import lock

[Antoine Pitrou]

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

Updated patch against tip. I also changed the internal API of module locks a bit (acquire() raises _DeadlockError instead of returning False, and deadlock detection is not optional anymore).

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Added file: http://bugs.python.org/file25496/module_locks8.patch

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