[NobleExpress]

MESI cache coherency (and its derivatives) [1] means that you can have exclusive writes to cache if and only if no other core tries to access that data. I would think most if not all microarchitectures have moved to MESI (or equivalent) cache coherency protocols as they avoid unnecessary writes to memory.

[1]: https://en.wikipedia.org/wiki/MESI

[kaba0]

Sure, but for shared objects you can’t allow data races.

[vlovich123]

Objects shared across threads. Most don’t need to be.

[_a_a_a_]

I don't understand the relevance of this.