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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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2 changes: 0 additions & 2 deletions Lib/test/test_logging.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4119,8 +4119,6 @@ def test_90195(self):
# Logger should be enabled, since explicitly mentioned
self.assertFalse(logger.disabled)

# TODO: RUSTPYTHON - SemLock not implemented on Windows
@unittest.expectedFailureIfWindows("TODO: RUSTPYTHON")
def test_111615(self):
# See gh-111615
import_helper.import_module('_multiprocessing') # see gh-113692
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1 change: 0 additions & 1 deletion Lib/test/test_socket.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6620,7 +6620,6 @@ def remoteProcessServer(cls, q):
s2.close()
s.close()

@unittest.expectedFailure # TODO: RUSTPYTHON; multiprocessing.SemLock not implemented
def testShare(self):
# Transfer the listening server socket to another process
# and service it from there.
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10 changes: 8 additions & 2 deletions crates/stdlib/src/mmap.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -557,9 +557,15 @@ mod mmap {
// Parse tagname: None or a string
let tag_str: Option<String> = match tagname {
Some(ref obj) if !vm.is_none(obj) => {
Some(obj.try_to_value::<String>(vm).map_err(|_| {
let s = obj.try_to_value::<String>(vm).map_err(|_| {
vm.new_type_error("tagname must be a string or None".to_owned())
})?)
})?;
if s.contains('\0') {
return Err(vm.new_value_error(
"tagname must not contain null characters".to_owned(),
));
}
Some(s)
}
_ => None,
};
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