[Python-Dev] Dealing with import lock deadlock in Import Hooks

Brett Cannon brett at python.org
Mon Aug 12 16:23:12 CEST 2013

On Mon, Aug 12, 2013 at 5:12 AM, Arnaud Fontaine <arnaud.fontaine at nexedi.com
> wrote:

> Victor Stinner <victor.stinner at gmail.com> writes:
> >>I'm currently working on implementing Import Hooks (PEP302) with Python
> >> 2.7 to be able to import modules whose code is in ZODB. However, I have
> >> stumbled upon a widely known issue about import deadlock[0][1] (...)
> >
> > In Python 3.3, the import machinery has been rewritten (importlib is used
> > by default) and the import lock is now per module, no more global.
> Yes, I saw the bug report and its patch implementing the import lock per
> module (mentioned in my initial email) and watched the presentation by
> Brett Cannon (BTW, I could not find the diagram explained during the
> presentation, anyone knows if it's available somewhere?).


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