Re: [Minios-devel] [UNIKRAFT PATCH 02/11] include/uk: import write_once and read_once from freebsd

[Sharan Santhanam <sharan.santhanam@xxxxxxxxx>]

Hello Yuri,

This patch seems fine.

Reviewed-by: Sharan Santhanam <sharan.santhanam@xxxxxxxxx>

Thanks & Regards
Sharan

On 12/5/18 6:23 PM, Yuri Volchkov wrote:
> commit <910f555845468ecbdd14dbce7bcc584812e084dc>
>
> Signed-off-by: Yuri Volchkov <yuri.volchkov@xxxxxxxxx>
> ---
>   include/uk/arch/atomic.h | 17 +++++++++++++++++
>   1 file changed, 17 insertions(+)
>
> diff --git a/include/uk/arch/atomic.h b/include/uk/arch/atomic.h
> index ce8f6e5..ccd4417 100644
> --- a/include/uk/arch/atomic.h
> +++ b/include/uk/arch/atomic.h
> @@ -87,4 +87,21 @@ extern "C" {
>   }
>   #endif
>   
> +#define	UK_ACCESS_ONCE(x)			(*(volatile __typeof(x) *)&(x))
> +
> +#define        UK_WRITE_ONCE(x, v) do {        \
> +       barrier();                      \
> +       UK_ACCESS_ONCE(x) = (v);        \
> +       barrier();                      \
> +} while (0)
> +
> +#define        UK_READ_ONCE(x) ({              \
> +       __typeof(x) __var = ({          \
> +               barrier();              \
> +               UK_ACCESS_ONCE(x);      \
> +       });                             \
> +       barrier();                      \
> +       __var;                          \
> +})
> +
>   #endif /* __UKARCH_ATOMIC_H__ */
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