Okay, sorry, I was thinking too Jython-like. I fixed runGC() just to see now that it does not even trigger resurrection, since under CPython there are no finalizers executed in ref cycles (i.e. I find my objects in gc.garbage). So I realize, my xy_cyclic tests are pointless anyway since in cyclic gc no resurrection can happen.
> The second problem (with weakref) is different: weakrefs are cleared > before __del__ is called, so resurrection doesn't affect the whole > process. It appears weakrefs are only cleared if this is done by gc (where no resurrection can happen anyway). If a resurrection-performing-__del__ is just called by ref-count-drop-to-0, weakrefs persist - a behavior that is very difficult and inefficient to emulate in Jython, but I'll give it some more thoughts... However thanks for the help! -Stefan > Gesendet: Sonntag, 26. Oktober 2014 um 01:22 Uhr > Von: "Antoine Pitrou" <solip...@pitrou.net> > An: python-dev@python.org > Betreff: Re: [Python-Dev] results of id() and weakref.getweakrefs() sometimes > break on object resurrection > > > Hello Stefan, > > On Sun, 26 Oct 2014 00:20:47 +0200 > "Stefan Richthofer" <stefan.richtho...@gmx.de> wrote: > > Hello developers, > > > > I observed strange behaviour in CPython (tested in 2.7.5 and 3.3.3) > > regarding object resurrection. > > Your runGC() function is buggy, it does not run the GC under CPython. > Fix it and the first problem (with id()) disappears. > > The second problem (with weakref) is different: weakrefs are cleared > before __del__ is called, so resurrection doesn't affect the whole > process. Add a callback to the weakref and you'll see it is getting > called. > > In other words, CPython behaves as expected. Your concern is > appreciated, though. > > Regards > > Antoine. > > > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/stefan.richthofer%40gmx.de > _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
