Re: [PATCH v11 0/6] MR7610: Draft: win32u: Create a shared object for user handle entries.

[Jinoh Kang (＠iamahuman)]

Jinoh Kang (@iamahuman) commented about server/user.c:
> +     * need atomic intrinsics to guarantee that. */
> +#if defined(__i386__) || defined(__x86_64__)
> +    *ptr = value;
> +#else
> +    __atomic_store_n(ptr, value, __ATOMIC_SEQ_CST);
> +#endif
> +}
> +
> +static void atomic_store_u64(volatile unsigned __int64 *ptr, unsigned __int64 value)
> +{
> +    /* on x86 there should be total store order guarantees, so volatile is
> +     * enough to ensure the stores aren't reordered by the compiler, and then
> +     * they will always be seen in-order from other CPUs. On other archs, we
> +     * need atomic intrinsics to guarantee that. */
> +#if defined(__i386__) || defined(__x86_64__)
> +    *ptr = value;
> 64-bit volatile stores are not atomic on `__i386__`.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/7610#note_98862