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dbtouch
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Since: Jun 22, 2009
Posts: 3
PostPosted: Mon Jun 22, 2009 12:59 pm    Post subject: declaration of memory barrier function
Archived from groups: comp>os>linux>development>apps (more info?)
Dear Linux Programmers,

I am using fedora 10 with version of 2.6.27.5-117.fc10.x86_64 #1 SMP.
I am looking for the system head file where memory barrier functions
are declared.

Thanks,

dbtouch
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David Schwartz
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Since: Apr 29, 2007
Posts: 57
PostPosted: Mon Jun 22, 2009 4:21 pm    Post subject: Re: declaration of memory barrier function [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
On Jun 22, 12:59 pm, dbtouch <dbto... DeleteThis @gmail.com> wrote:
> Dear Linux Programmers,
>
> I am using fedora 10 with version of 2.6.27.5-117.fc10.x86_64 #1 SMP.
> I am looking for the system head file where memory barrier functions
> are declared.
>
> Thanks,
>
> dbtouch

There is no memory barrier API provided by default. If you want one,
you have to code it. On x86-64, this is sufficient:

#define membar() __asm__ __volatile__("" : : : "memory")

DS
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dbtouch
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Since: Jun 22, 2009
Posts: 3
PostPosted: Mon Jun 22, 2009 6:14 pm    Post subject: Re: declaration of memory barrier function [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
On Jun 22, 7:21 pm, David Schwartz <dav....RemoveThis@webmaster.com> wrote:
> On Jun 22, 12:59 pm, dbtouch <dbto....RemoveThis@gmail.com> wrote:
>
> > Dear Linux Programmers,
>
> > I am using fedora 10 with version of 2.6.27.5-117.fc10.x86_64 #1 SMP.
> > I am looking for the system head file where memory barrier functions
> > are declared.
>
> > Thanks,
>
> > dbtouch
>
> There is no memory barrier API provided by default. If you want one,
> you have to code it. On x86-64, this is sufficient:
>
> #define membar()  __asm__ __volatile__("" : : : "memory")
>
> DS

Hi, DS

Thanks.

What about smp_mb() mentioned in this article? Where I can find its
definition?

http://www.linuxjournal.com/article/8212
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David Schwartz
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Since: Apr 29, 2007
Posts: 57
PostPosted: Mon Jun 22, 2009 6:33 pm    Post subject: Re: declaration of memory barrier function [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
On Jun 22, 6:14 pm, dbtouch <dbto....TakeThisOut@gmail.com> wrote:

> What about smp_mb()  mentioned in this article? Where I can find its
> definition?

Are you trying to write kernel code or user space code?

DS
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dbtouch
External


Since: Jun 22, 2009
Posts: 3
PostPosted: Mon Jun 22, 2009 6:53 pm    Post subject: Re: declaration of memory barrier function [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
On Jun 22, 9:33 pm, David Schwartz <dav....TakeThisOut@webmaster.com> wrote:
> On Jun 22, 6:14 pm, dbtouch <dbto....TakeThisOut@gmail.com> wrote:
>
> > What about smp_mb()  mentioned in this article? Where I can find its
> > definition?
>
> Are you trying to write kernel code or user space code?
>
> DS

I am trying to modify libpcap and I need memory barrier function.

dbtouch
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