Antoine Pitrou <pit...@free.fr> added the comment:

Ok, here is a draft patch for the new importlib.
Several issues with this patch:
- introduces a pure Python function (_lock_unlock_module) on the fast import 
path
- synchronization issues due to interruptibility of pure Python code (see 
_ModuleLock.acquire)
- afterfork fix-up necessary
- relies on _thread.RLock for bootstrapping reasons
- module locks are immortal

----------
Added file: http://bugs.python.org/file25392/module_locks.patch

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