Fixing core.atomic

[Ola Fosheim Grøstad]

On Wednesday, 2 June 2021 at 14:08:32 UTC, rm wrote:
> It's useful if you want to implement known concurrency 
> algorithms with SC semantics. Such as lamports lock (which 
> requires SC).

Have you ever used Lamport's Bakery, though?

Atomic inc/dec are obviously useful, but usually you want to know 
what the value was before/after the operation, so 
fetch_add/compare_exchange are easier to deal with IMO.