[Stackless] _Py_RefTotal wrong in Py 2.2.3
tismer at tismer.com
Mon Nov 17 02:02:48 CET 2003
over the weekend, I hacked quite a lot on Stackless
with Python 2.2.3, in order to get rid of refcounting
problems with thread pickling.
It tuned out that code objects created wrong refcounts
when unpickling them.
I debuged this down to the very end, until I was sure
my stuff is doing it right. Then I added a small function
that recomputes the actual total refcounts from the
chained list of all objects, and it turned out to be
correct (and also my pickling), but _Py_RefTotal is different.
Before I invest more time into this, please let me know:
Is this a known problem which is solved by moving to
Python 2.3.2, or should I try to find the bug?
I know this is hard to debug for anybody but me, since pickling
of code objects is a Stackless only feature.
The key might be here:
op->ob_refcnt = 1;
op->_ob_next = refchain._ob_next;
op->_ob_prev = &refchain;
refchain._ob_next->_ob_prev = op;
refchain._ob_next = op;
It might be that at some place, this function is used when
the refcount is not zero, but I don't know. This would get
_Py_RefTotal and the real refcounts out of sync.
Many thanks -- chris
Christian Tismer :^) <mailto:tismer at tismer.com>
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