From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 26 May 2002 06:19:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 26 May 2002 06:19:10 -0400 Received: from codepoet.org ([166.70.14.212]:57560 "EHLO winder.codepoet.org") by vger.kernel.org with ESMTP id ; Sun, 26 May 2002 06:19:09 -0400 Date: Sun, 26 May 2002 04:19:10 -0600 From: Erik Andersen To: Robert Schwebel Cc: linux-kernel@vger.kernel.org Subject: Re: patent on O_ATOMICLOOKUP [Re: [PATCH] loopable tmpfs (2.4.17)] Message-ID: <20020526101910.GA23705@codepoet.org> Reply-To: andersen@codepoet.org Mail-Followup-To: Erik Andersen , Robert Schwebel , linux-kernel@vger.kernel.org In-Reply-To: <20020526005827.B598@schwebel.de> <20020526004853.GA18679@codepoet.org> <20020526073136.H598@schwebel.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.28i X-Operating-System: Linux 2.4.18-rmk5, Rebel-NetWinder(Intel StrongARM 110 rev 3), 185.95 BogoMips X-No-Junk-Mail: I do not want to get *any* junk mail. Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun May 26, 2002 at 07:31:36AM +0200, Robert Schwebel wrote: > On Sat, May 25, 2002 at 06:48:53PM -0600, Erik Andersen wrote: > > So now we have a full 3D model of the robot, the non-liner model > > of the robot PID-gain space, the entire (application specific) > > workcell model, the robot specific forward and inverse kinematics > > routines, and the entire trajectory planning subsystem. And of > > course we now need the real-time IO subsystem to handle are the > > thousands of this-and-that sensors (think PLC-type behavior). > > etc, etc, etc. All this in the kernel? Nah... > > People are doing this (or at least something similar) in reality these > days... :-) Oh I know they are. I was doing all of this stuff while in grad school back in 1996, and later at my first job I was doing this stuff too. Had to use LynxOS back then. Would have been nice if we could have used Linux... I was watching RTLinux closely back then -- long before the patent problem. :) > Hopefully, your post shows clearly why there are users out there who don't > want to make such complex algorithms open source, and I must say I can > understand them. That was the hope. So people would understand that this isn't the type of application where you can just squirrel away the real-time bits in a device driver... Its got to be the whole thing, -Erik -- Erik B. Andersen http://codepoet-consulting.com/ --This message was written using 73% post-consumer electrons--