Message353708
Neil, about this comment:
# - ct is not yet trash (it actually is but the GC doesn't know because of
# the missing tp_traverse method).
I believe gc should know ct is trash. ct is in the cf list, and the latter does have tp_traverse.
What gc won't know is that `a` is trash, because `a` is attached to ct, and ct doesn't have tp_traverse.
It should blow up anyway :-)
Maybe with a simpler structure it would be easier to rearrange code to nudge the callback into getting cleared before use?
Z <- Y <- A <-> B -> WZ -> C
where WZ is a weakref to Z with callback C, and Y doesn't implement tp_traverse. The only cycle is between A and B, which could just as well be the same object. All the other stuff hangs off that cycle.
It's all trash, but we won't know in advance that Z is part of it. |
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Date |
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2019-10-01 18:29:30 | tim.peters | set | recipients:
+ tim.peters, nascheme, pitrou, vstinner, larry, christian.heimes, benjamin.peterson, ned.deily, petr.viktorin, methane, lukasz.langa, Mark.Shannon, jdemeyer, pablogsal, miss-islington |
2019-10-01 18:29:30 | tim.peters | set | messageid: <1569954570.37.0.419140675844.issue38006@roundup.psfhosted.org> |
2019-10-01 18:29:30 | tim.peters | link | issue38006 messages |
2019-10-01 18:29:30 | tim.peters | create | |
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