The code is here https://source.winehq.org/source/dlls/ntdll/sync.c#0474 and it ...

		zozbot234 on March 3, 2024 \| parent \| context \| favorite \| on: Bug in reader/writer locks in Windows API The code is here https://source.winehq.org/source/dlls/ntdll/sync.c#0474 and it uses compare exchange operations throughout, so it should be unaffected. The ReactOS implementation is more involved https://doxygen.reactos.org/d1/db8/srw_8c_source.html but still, it uses mostly CAS operations both for the shared and the exclusive case. So it should be largely free from issues.

The WINE team has expressed frustrations in the past about implementing the Windows APIs to spec... Only to find out Microsoft didn't