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Implement Windows SemLock in _multiprocessing module #7199

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Merged
youknowone merged 7 commits into from
Feb 24, 2026
Merged

Implement Windows SemLock in _multiprocessing module #7199

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e88eaf0
Implement Windows SemLock in _multiprocessing module
youknowone Feb 17, 2026
2903370
Fix _multiprocessing recv to return bytes and improve SemLock reliabi…
youknowone Feb 22, 2026
4dd6042
Include winerror in OSError.__reduce__ on Windows
youknowone Feb 22, 2026
c40092b
Remove expectedFailure for tests now passing with Windows SemLock
youknowone Feb 22, 2026
9649be1
Fix OSError.__reduce__ to preserve winerror when filename is None
youknowone Feb 22, 2026
c7d65b9
Validate maxvalue > 0 in SemLock and document winerror __reduce__ div…
youknowone Feb 23, 2026
7b8bce4
Reject embedded null characters in mmap tagname and _winapi file mapp…
youknowone Feb 23, 2026
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Fix OSError.__reduce__ to preserve winerror when filename is None 
When filename is None, __reduce__ was reconstructing a 2-element
(errno, msg) tuple, dropping the winerror at position 3 in the
original args. Use the original args tuple instead, matching CPython.
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@youknowone
youknowone committed Feb 23, 2026
commit 9649be17d99a02fc6313c269119dae803d2a9828
6 changes: 4 additions & 2 deletions crates/vm/src/exceptions.rs
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Expand Up @@ -2084,10 +2084,12 @@ pub(super) mod types {
}
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result.push(args_reduced.into_pytuple(vm).into());
} else {
result.push(vm.new_tuple((errno, msg)).into());
// filename is None - use original args as-is
// (may contain winerror at position 3)
result.push(args.into());
}
} else {
result.push(vm.new_tuple((errno, msg)).into());
result.push(args.into());
}
} else {
result.push(args.into());
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