Date: Sat, 8 Nov 2008 04:38:25 +0000 From: "Kip Macy" <kmacy@freebsd.org> To: "M. Warner Losh" <imp@bsdimp.com> Cc: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: Re: svn commit: r184759 - user/kmacy/HEAD_fast_multi_xmit/sys/net Message-ID: <3c1674c90811072038q1fd750c0t23073a2cc49f30dd@mail.gmail.com> In-Reply-To: <20081107.213326.-363916120.imp@bsdimp.com> References: <200811080202.mA822D0W098283@svn.freebsd.org> <20081107.213326.-363916120.imp@bsdimp.com>
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I doubt it, but would be happy to be proven incorrect. So ... yes, please.
Cheers,
Kip
On Sat, Nov 8, 2008 at 4:33 AM, M. Warner Losh <imp@bsdimp.com> wrote:
> In message: <200811080202.mA822D0W098283@svn.freebsd.org>
> Kip Macy <kmacy@FreeBSD.org> writes:
> : +#if defined (__GNUC__)
> : + #if #cpu(i386) || defined __i386 || defined i386 || defined __i386__ || #cpu(x86_64) || defined __x86_64__
> : + #define mb() __asm__ __volatile__ ("sfence;": : :"memory")
> : + #elif #cpu(sparc64) || defined sparc64 || defined __sparcv9
> : + #define mb() __asm__ __volatile__ ("membar #MemIssue": : :"memory")
> : + #elif #cpu(sparc) || defined sparc || defined __sparc__
> : + #define mb() __asm__ __volatile__ ("stbar;": : :"memory")
> : + #else
> : + #define mb() /* XXX just to make this compile */
> : + #endif
> : +#else
> : + #error "unknown compiler"
> : +#endif
>
> I thought that gcc had a sequence that did this in a platform
> independent way. should I dig it up for you?
>
> Warner
>
--
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
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