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ERROR_ATOMIC_LOCKS_NOT_SUPPORTED
The file system does not support atomic lock conversion
ERROR_ATOMIC_LOCKS_NOT_SUPPORTED is a Win32 result associated with file locking on local, network, or specialized file systems.
What the result means
The target file system cannot atomically change the requested lock type.
What to check
- Identify the filesystem and whether the handle refers to a local file, SMB share, or redirected storage.
- Check whether the application is attempting to upgrade or downgrade a lock without releasing it.
- Review the filesystem and server documentation for supported byte-range locking semantics.
- Test a release-and-reacquire fallback only if a temporary unlocked window is acceptable.
Recommended handling
Do not emulate an atomic conversion with separate unlock and lock calls when another process could observe or modify the protected range between them. Redesign the synchronization protocol or use a supported storage target.
References
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