[issue9260] A finer grained import lock

[Antoine Pitrou]

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

New prototype with per-module import locks and deadlock avoidance.
When a deadlock due to threaded circular imports is detected, the offending import returns the partially constructed module object (as would happen in single-threaded mode).

Probably lacks a test and some cleanup.

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nosy: +neologix
versions: +Python 3.3 -Python 3.2
Added file: http://bugs.python.org/file24101/implock3.patch

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