That's not a very useful property, though. Because inter-core memory works on cache-line granularities, packing more than one lock in a cache line is a Bad Idea™. Potentially it allows you to pack more data being protected by a lock with that data... but alignment rules means that you're going to invariably end up spending 4 or 8 bytes (via a regular integer or a pointer) on that lock anyways.
That's not a very useful property, though. Because inter-core memory works on cache-line granularities, packing more than one lock in a cache line is a Bad Idea™. Potentially it allows you to pack more data being protected by a lock with that data... but alignment rules means that you're going to invariably end up spending 4 or 8 bytes (via a regular integer or a pointer) on that lock anyways.