Atomic bit operations

[Crayo List]

On Tuesday, 11 December 2018 at 01:37:25 UTC, Adam D. Ruppe wrote:
> On Monday, 10 December 2018 at 23:20:22 UTC, Crayo List wrote:
>> Are there atomic equivalents of bt(), btc(), bts(), btr() ... 
>> etc from core.bitop?
>
> Those are intrinsics that compile into a single cpu 
> instruction, so they are probably already atomic...

Thanks Adam,

They need to be prefixed with 'lock' (on x86) in order to be 
atomic.
That's what _interlockedbittestandset() on Windows does.
And what this page says; 
https://www.felixcloutier.com/x86/LOCK.html

It may be possible to implement using asm { }, but I was 
wondering if there wasn't something out there already doing it.