Thanks for the leveled response! > Sure, but memory ordering is orthogonal to LL/SC vs CAS. Sure, but your original claim was that std::atomic has been design

Thanks for the leveled response! > Sure, but memory ordering is orthogonal to LL/SC vs CAS. Sure, but your original claim was that std::atomic has been designed with only x64 in mind. That's what I meant to argue against. I agree that the omission of something like fetch_update() has been an oversight and I hope that it will make it into the C++ standard! As a side note, here's what the Rust docs say about fetch_update(): > This method is not magic; it is not provided by the hardware. It is implemented in terms of AtomicUsize::compare_exchange_weak, and suffers from the same drawbacks. https://doc.rust-lang.org/std/sync/atomic/struct.AtomicUsize.html#considerations https://doc.rust-lang.org/std/sync/atomic/struct.AtomicUsize... So Rust's std::sync::atomic is equally "useless"? :)