Followup to: <EE83E551E08D1D43AD52D50B9F5110927E7A15@ntserver2>
By author: Gregory Giguashvili <Gregoryg@ParadigmGeo.com>
In newsgroup: linux.dev.kernel
>
> Could you, please, clarify what you meant saying that there was no way of
> doing so. I admit, I'm no expert in i386 assembly, but this operation seems
> so simple to me...
>
That doesn't mean the hardware is going to provide it atomically.
>
> Could you, please, suggest some other implementation (with waiting and
> trying again - whatever this means)?
>
Very simple:
- Set a spinlock (note: you need a spinlock variable)
- Read
- Add
- Clear spinlock
This is called "bootstrapping" -- using a more primitive atomic
operation to get what you need.
-hpa
-- <hpa@transmeta.com> at work, <hpa@zytor.com> in private! "Unix gives you enough rope to shoot yourself in the foot." http://www.zytor.com/~hpa/puzzle.txt <amsp@zytor.com> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Fri Jun 07 2002 - 22:00:16 EST