[RFC 2/2] rust: sync: Add atomic support

[Boqun Feng]

On Fri, Jun 14, 2024 at 06:03:37PM -0700, John Hubbard wrote:
> On 6/14/24 2:59 AM, Miguel Ojeda wrote:
> > On Thu, Jun 13, 2024 at 9:05 PM Boqun Feng <boqun.feng at gmail.com> wrote:
> > > 
> > > Does this make sense?
> > 
> > Implementation-wise, if you think it is simpler or more clear/elegant
> > to have the extra lower level layer, then that sounds fine.
> > 
> > However, I was mainly talking about what we would eventually expose to
> > users, i.e. do we want to provide `Atomic<T>` to begin with? If yes,
> > then we could make the lower layer private already.
> > 
> > We can defer that extra layer/work if needed even if we go for
> > `Atomic<T>`, but it would be nice to understand if we have consensus
> > for an eventual user-facing API, or if someone has any other opinion
> > or concerns on one vs. the other.
> 
> Well, here's one:
> 
> The reason that we have things like atomic64_read() in the C code is
> because C doesn't have generics.
> 
> In Rust, we should simply move directly to Atomic<T>, as there are,
> after all, associated benefits. And it's very easy to see the connection

What are the associated benefits you are referring to? Rust std doesn't
use Atomic<T>, that somewhat proves that we don't need it.

Regards,
Boqun

> between the C types and the Atomic<T> types.
> 
> 
> thanks,
> -- 
> John Hubbard
> NVIDIA
>