[issue9260] A finer grained import lock

[Antoine Pitrou]

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

> So I say we don't worry about loaders being thread-safe. If __import__
> handles the locking for a specific module then it will hold the lock
> on behalf of the loader.

Yes but what happens if two different modules are imported from two
different threads, and handled by the same loader? The loader could have
global structures which rely on serialization of imports for
consistency.

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