[Python-Dev] Iterating generator from C (PostgreSQL's pl/python RETUN SETOF/RECORD iterator support broken on RedHat buggy libs) (original) (raw)

Hannu Krosing hannu at tm.ee
Wed May 31 16:17:18 CEST 2006

Ühel kenal päeval, P, 2006-05-28 kell 14:18, kirjutas Thomas Wouters:

On 5/20/06, Hannu Krosing <hannu at tm.ee> wrote: I try to move this to -dev as I hope there more people reading it who are competent in internal working :). So please replay to -dev only. I'm not sure if you have found the problem on another mailinglist then, but I saw no answers on python-dev.

------------- The question is about use of generators in embedde v2.4 with asserts enabled. Can somebody explain, why the code in try2.c works with wrappers 2 and 3 but crashes on buggy exception for all others, that is pure generator and wrappers 1,4,5 ? Your example code does not crash for me, not for any of the 'wrappersource' variants, linking against Python 2.4 (debian's python 2.4.3 on amd64, both in 64-bit and 32-bit mode) or Python 2.5 (current trunk, same hardware.) I don't know what kind of crash you were expecting, but I do see unchecked return values, which can cause crashes for the simplest of reasons ;-)

Fedora Core distributes its python libs with asserts on, and this code triggers an assert, both without a wrapper and with most wrappers

[hannu at lap plpython]$ ./try2 one try2: Objects/genobject.c:53: gen_iternext: Assertion `f->f_back != ((void *)0)' failed. Aborted

This is reported to be fixed for 2.5 (they changed the assert), but I'd like to have a workaround which would not trigger the old buggy assert.

-- Thomas Wouters <thomas at python.org>

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