Re: xchg()

Previous message: David Wheeler: "xchg()"
In reply to: David Wheeler: "xchg()"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

chrisat_private

* David Wheeler (dwheelerat_private) wrote:
> James Morris said:
>  > xchg() may be useful in some situations.
> 
> The name of the function certainly sounds very promising;
> an atomic exchange operation that can swap pointers
> would be just ducky.  It's actually overkill - all I need
> is atomic assigment - but it'll certainly solve the problem.

heh, well it's less overhead than the spin lock.

> But where is this xchg() operation?  A recursive grep for
> "xchg" found stuff in arch/ppc, but that's it in
> linux 2.5.26.  Do you mean an xchg operation for some
> specific CPU architecture?  If so, that's less desirable -
> I'd like an operation that ports to anything if possible.

look in arch specific system.h.  typically a macro.

thanks,
-chris
-- 
Linux Security Modules     http://lsm.immunix.org     http://lsm.bkbits.net
_______________________________________________
linux-security-module mailing list
linux-security-moduleat_private
http://mail.wirex.com/mailman/listinfo/linux-security-module