bpo-42972: _thread.RLock type implements tp_traverse #26734
Conversation
vstinner
added
needs backport to 3.10
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Leak discovered by #26727 |
The _thread.RLock type now fully implement the GC protocol: add a traverse function and the Py_TPFLAGS_HAVE_GC flag.
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Don't we have a warning for when heap types don't implement a |
No, the warning is when a heap type has the GC flags but don't have tp_traverse. in this case we were missing the GC flags so the check failed to raise the warning |
I agree that a warning should be emitted at runtime when a heap type doesn't have the Py_TPFLAGS_HAVE_GC or doesn't implement tp_traverse. I suggest to discuss this idea in https://bugs.python.org/issue42972 It's super hard to discover such very tricky bug if you don't have a very deep understanding of GC internals and how Python works. |
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Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.10. |
The _thread.RLock type now fully implement the GC protocol: add a traverse function and the Py_TPFLAGS_HAVE_GC flag. (cherry picked from commit 1cd3d85) Co-authored-by: Victor Stinner <vstinner@python.org>
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GH-26735 is a backport of this pull request to the 3.10 branch. |
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Thanks for your reviews @pablogsal and @shihai1991 ;-) |
The _thread.RLock type now fully implement the GC protocol: add a traverse function and the Py_TPFLAGS_HAVE_GC flag.
The _thread.RLock type now fully implement the GC protocol: add a
traverse function and the the Py_TPFLAGS_HAVE_GC flag.
https://bugs.python.org/issue42972