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gh-145685: Stop the world when updating MRO of existing types#145707
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colesbury merged 1 commit intopython:mainfromMar 9, 2026
Merged
gh-145685: Stop the world when updating MRO of existing types#145707colesbury merged 1 commit intopython:mainfrom
colesbury merged 1 commit intopython:mainfrom
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We already have a stop-the-world pause elsewhere in this code path(type_set_bases) and this makes will make it easier to avoid contentionon the TYPE_LOCK when looking up names in the MRO hierarchy.Also use deferred reference counting for non-immortal MROs.
mpage approved these changesMar 9, 2026
0b65c88 intopython:main 58 checks passed
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Thanks@colesbury for the PR 🌮🎉.. I'm working now to backport this PR to: 3.14. |
Sorry,@colesbury, I could not cleanly backport this to |
colesbury added a commit to colesbury/cpython that referenced this pull requestMar 9, 2026
…types (pythongh-145707)We already have a stop-the-world pause elsewhere in this code path(type_set_bases) and this makes will make it easier to avoid contentionon the TYPE_LOCK when looking up names in the MRO hierarchy.Also use deferred reference counting for non-immortal MROs.(cherry picked from commit0b65c88)Co-authored-by: Sam Gross <colesbury@gmail.com>
GH-145715 is a backport of this pull request to the3.14 branch. |
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We already have a stop-the-world pause elsewhere in this code path (type_set_bases) and this makes will make it easier to avoid contention on the TYPE_LOCK when looking up names in the MRO hierarchy.
Also use deferred reference counting for non-immortal MROs.
_PyType_Lookup/_PyType_LookupStackRefAndVersion#145685