lock: add an opt-in rwlock that detaches before it blocks - #8556

Merged

youknowone merged 15 commits into

RustPython:mainfrom

youknowone:lock-detach-on-contention

Aug 28, 2026

Commits on Aug 27, 2026

lock: add an opt-in rwlock that detaches before it blocks
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c422c9a
lock: stop detaching where the lock may already be held
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os.readinto: read aside when the fd can wait
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fcntl: detach around the calls that wait
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openssl: read aside instead of holding the caller's buffer locked
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vm: add the inverse of allow_threads for callbacks
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openssl: attach around the callbacks that run Python
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openssl: detach around the SSL calls that wait
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lock: assert the opt-in rule against every stop-the-world section
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clippy: drop std_instead_of_core suppressions
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lock: spell out why the detaching rwlock exists
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fcntl: raise the error the call returned
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openssl: allocate the read buffer through the vm
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lock: leave no attached blocking acquire on a detaching lock
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vm: wait for the actual block in the stop-the-world test
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