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[3.14] gh-145685: Stop the world when updating MRO of existing types (gh-145707) - #145715
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…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 contention on the TYPE_LOCK when looking up names in the MRO hierarchy. Also use deferred reference counting for non-immortal MROs. (cherry picked from commit 0b65c88) Co-authored-by: Sam Gross <colesbury@gmail.com>
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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.
(cherry picked from commit 0b65c88)