[issue9260] A finer grained import lock

[Antoine Pitrou]

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

> So changing the locking mechanism most likely won't break loaders
> because they are not using the current import lock anyway and so
> already have their own issues.

Are you sure they aren't using it implicitly? 
In vanilla py3k, PyImport_ImportModuleLevel() takes the import lock
therefore it protects any inner code, including the various hooks.

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