[PATCH v6 0/6] rte atomics API for optional stdatomic

[David Marchand]

Hello,

On Tue, Aug 22, 2023 at 11:00 PM Tyler Retzlaff
<roretzla at linux.microsoft.com> wrote:
>
> This series introduces API additions prefixed in the rte namespace that allow
> the optional use of stdatomics.h from C11 using enable_stdatomics=true for
> targets where enable_stdatomics=false no functional change is intended.
>
> Be aware this does not contain all changes to use stdatomics across the DPDK
> tree it only introduces the minimum to allow the option to be used which is
> a pre-requisite for a clean CI (probably using clang) that can be run
> with enable_stdatomics=true enabled.
>
> It is planned that subsequent series will be introduced per lib/driver as
> appropriate to further enable stdatomics use when enable_stdatomics=true.
>
> Notes:
>
> * Additional libraries beyond EAL make visible atomics use across the
>   API/ABI surface they will be converted in the subsequent series.
>
> * The eal: add rte atomic qualifier with casts patch needs some discussion
>   as to whether or not the legacy rte_atomic APIs should be converted to
>   work with enable_stdatomic=true right now some implementation dependent
>   casts are used to prevent cascading / having to convert too much in
>   the intial series.
>
> * Windows will obviously need complete conversion of libraries including
>   atomics that are not crossing API/ABI boundaries. those conversions will
>   introduced in separate series as new along side the existing msvc series.
>
> Please keep in mind we would like to prioritize the review / acceptance of
> this patch since it needs to be completed in the 23.11 merge window.
>
> Thank you all for the discussion that lead to the formation of this series.

I did a number of updates on this v6:
- moved rte_stdatomic.h from patch 1 to later patches where needed,
- added a RN entry,
- tried to consistently/adjusted indent,
- fixed mentions of stdatomic*s* to simple atomic, like in the build
option name,
- removed unneded comments (Thomas review on patch 1),

Series applied, thanks Tyler.


Two things are missing:
- add doxygen tags in the new API (this can be fixed later in this
release, can you look at it?),
- add compilation tests for enable_stdatomic (I'll send a patch soon
for devtools and GHA),


-- 
David Marchand