linux-kernel - Re: [rfc][patch] queued spinlocks (i386)

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Message-ID:  <loom.20070323T174227-697@post.gmane.org>
Date:	Fri, 23 Mar 2007 16:48:56 +0000 (UTC)
From:	Parag Warudkar <parag.warudkar@...il.com>
To:	linux-kernel@...r.kernel.org
Subject:  Re: [rfc][patch] queued spinlocks (i386)

Nick Piggin <npiggin <at> suse.de> writes:

> 
> On Fri, Mar 23, 2007 at 11:04:18AM +0100, Ingo Molnar wrote:
> > 
> > * Nick Piggin <npiggin <at> suse.de> wrote:
> > 
> > > Implement queued spinlocks for i386. [...]
> > 
> > isnt this patented by MS? (which might not worry you SuSE/Novell guys, 
> > but it might be a worry for the rest of the world 
> 
> I never thought a FIFO queue would be patentable.
> 
> Do you have a reference to the patent number?
> 

The ReactOS guys none the less, seem to have implemented queued spin locks -
http://www.reactos.org/en/newsletter_10.html (see the HAL section.)

Now I haven't looked at the code to see if they are different from what MS has
patented but given that it's a clone of Windows, one would think at least from
the behavioral pov they are similar?

Parag

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