From owner-freebsd-threads@FreeBSD.ORG  Fri Jul 25 00:43:33 2003
Return-Path: <owner-freebsd-threads@FreeBSD.ORG>
Delivered-To: freebsd-threads@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 08D7137B401; Fri, 25 Jul 2003 00:43:33 -0700 (PDT)
Received: from mail.pcnet.com (mail.pcnet.com [204.213.232.4])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 4860743F85; Fri, 25 Jul 2003 00:43:32 -0700 (PDT)
	(envelope-from eischen@vigrid.com)
Received: from mail.pcnet.com (mail.pcnet.com [204.213.232.4])
	by mail.pcnet.com (8.12.8/8.12.1) with ESMTP id h6P7hScJ009359;
	Fri, 25 Jul 2003 03:43:28 -0400 (EDT)
Date: Fri, 25 Jul 2003 03:43:28 -0400 (EDT)
From: Daniel Eischen <eischen@vigrid.com>
X-Sender: eischen@pcnet5.pcnet.com
To: Terry Lambert <tlambert2@mindspring.com>
In-Reply-To: <3F20DD72.A524688B@mindspring.com>
Message-ID: <Pine.GSO.4.10.10307250339460.8657-100000@pcnet5.pcnet.com>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
cc: threads@freebsd.org
cc: David Xu <davidxu@freebsd.org>
cc: Julian Elischer <julian@elischer.org>
cc: marcel@xcllnt.net
Subject: Re: KSD/TSD take 2 (was: KSE critical regions)
X-BeenThere: freebsd-threads@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
Reply-To: deischen@freebsd.org
List-Id: Threading on FreeBSD <freebsd-threads.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-threads>,
	<mailto:freebsd-threads-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-threads>
List-Post: <mailto:freebsd-threads@freebsd.org>
List-Help: <mailto:freebsd-threads-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-threads>,
	<mailto:freebsd-threads-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 25 Jul 2003 07:43:33 -0000

On Fri, 25 Jul 2003, Terry Lambert wrote:

> Daniel Eischen wrote:
> > I'd like to try and get his implemented in this next
> > round of changes.  If you are going to add a system
> > call, it's easy enough just to call the guts of it
> > from kse_create().
> 
> FWIW: One trick would be to use an "invalid" value for one of the
> parameters on the existing call to mux you into an alternate
> implementsion (which could even take additional parameters, for
> obvious reasons).

Possibly...

    i386_set_ldt(int start_sel, union descriptor *descs, int num_sels);

You could use start_sel = 0 and num_sels = 1 to have it automatically
find the first one not already allocated.  The function already
returns the first selector allocated.

-- 
Dan Eischen