[issue9260] A finer grained import lock

[Antoine Pitrou]

Antoine Pitrou <pitrou at 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

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

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