From owner-freebsd-hackers@FreeBSD.ORG  Tue Mar 15 20:28:20 2005
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id DC34B16A4CE
	for <freebsd-hackers@freebsd.org>;
	Tue, 15 Mar 2005 20:28:20 +0000 (GMT)
Received: from vms048pub.verizon.net (vms048pub.verizon.net [206.46.252.48])
	by mx1.FreeBSD.org (Postfix) with ESMTP id B68D743D49
	for <freebsd-hackers@freebsd.org>;
	Tue, 15 Mar 2005 20:28:20 +0000 (GMT)
	(envelope-from ringworm01@gmail.com)
Received: from ringworm.mechee.com ([4.27.46.32])0.04
	<0IDE00MW1U77JCE0@vms048.mailsrvcs.net> for
	freebsd-hackers@freebsd.org; Tue, 15 Mar 2005 14:28:20 -0600 (CST)
Received: by ringworm.mechee.com (Postfix, from userid 1001)
	id 14C3C2CE75B; Tue, 15 Mar 2005 12:28:18 -0800 (PST)
Date: Tue, 15 Mar 2005 12:28:16 -0800
From: "Michael C. Shultz" <ringworm01@gmail.com>
In-reply-to: <Pine.GSO.4.58.0503151349080.27785@icarus.cc.uic.edu>
To: Zera William Holladay <zholla1@uic.edu>
Message-id: <200503151228.17719.ringworm01@gmail.com>
MIME-version: 1.0
Content-type: text/plain; charset=iso-8859-1
Content-transfer-encoding: 7bit
Content-disposition: inline
References: <Pine.GSO.4.43.0503151312090.12075-100000@sea.ntplx.net>
 <200503151135.53269.ringworm01@gmail.com>
 <Pine.GSO.4.58.0503151349080.27785@icarus.cc.uic.edu>
User-Agent: KMail/1.7.2
cc: freebsd-hackers@freebsd.org
Subject: Re: threads question
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 15 Mar 2005 20:28:21 -0000

On Tuesday 15 March 2005 12:02 pm, you wrote:
> On Tue, 15 Mar 2005, Michael C. Shultz wrote:
> [cut]
>
> > The answer is probably something like what you just said, scope
> > being lost when making the call to a shared library. Why is it ok
> > going to a static library but not a shared though?
>
> There is probably a race condition, so your code will work *some* of
> the time unless you prevent the race condition.  I don't have an
> answer to your question, but I don't think it is a valid question. 
> The scope of "*priority" can remain valid or invalid for random
> reasons and thus may work some of the time, but the only way to
> guarantee that it works all the time is to eliminate the race
> condition by making sure that *property is valid though the life of
> the thread.
>
> -Zera

Hmmm, should I'll try making "property" global then passing a copy of it 
to each thread?  I think that will guarantee it stays valid.

-Mike