[Python-Dev] Dealing with import lock deadlock in Import Hooks
Armin Rigo
arigo at tunes.org
Mon Aug 12 11:09:45 CEST 2013
Hi Arnaud,
On Mon, Aug 12, 2013 at 9:39 AM, Arnaud Fontaine
<arnaud.fontaine at nexedi.com> wrote:
> Thread 1 is trying to import a module 'foo.bar' (where 'foo' is a
> package containing dynamic modules) handled by Import Hooks I
> implemented, so import lock is acquired before even running the hooks
> (Python/import.c:PyImport_ImportModuleLevel()). Then, these import
> hooks try to load objects from ZODB and a request is sent and handled
> by another thread (Thread 2) which itself tries to import another
> module.
A quick hack might be to call imp.release_lock() and
imp.acquire_lock() explicitly, from your import hook code, around
calls to ZODB.
A bientôt,
Armin.
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