[REFERENCE] Backport thread scheduling#239

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HParker wants to merge 2 commits intoruby_4_0from

backport-thread-scheduling

Commits on Mar 25, 2026

Give the hot thread scheduler priority

Jacob Lacouture
authored and
HParker
committed
use a hint avoid the optimistic sched lock drop/reacquire

Jacob Lacouture
authored and
HParker
committed