From owner-freebsd-threads@FreeBSD.ORG  Thu Jun  5 04:42:44 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 6FDCC37B401
	for <freebsd-threads@freebsd.org>;
	Thu,  5 Jun 2003 04:42:44 -0700 (PDT)
Received: from heron.mail.pas.earthlink.net (heron.mail.pas.earthlink.net
	[207.217.120.189])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 0593B43FDD
	for <freebsd-threads@freebsd.org>;
	Thu,  5 Jun 2003 04:42:44 -0700 (PDT)
	(envelope-from tlambert2@mindspring.com)
Received: from user-2ivfmr7.dialup.mindspring.com ([165.247.219.103]
	helo=mindspring.com)
	by heron.mail.pas.earthlink.net with asmtp (SSLv3:RC4-MD5:128)
	(Exim 3.33 #1)	id 19Nt8g-0006E6-00; Thu, 05 Jun 2003 04:42:39 -0700
Message-ID: <3EDF2C6B.7A8E5C21@mindspring.com>
Date: Thu, 05 Jun 2003 04:41:31 -0700
From: Terry Lambert <tlambert2@mindspring.com>
X-Mailer: Mozilla 4.79 [en] (Win98; U)
X-Accept-Language: en
MIME-Version: 1.0
To: Daniel Eischen <eischen@pcnet.com>
References: <Pine.GSO.4.10.10306041126030.13583-100000@pcnet5.pcnet.com>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-ELNK-Trace: b1a02af9316fbb217a47c185c03b154d40683398e744b8a4394c788ad2786350066fea3bf2740a44387f7b89c61deb1d350badd9bab72f9c350badd9bab72f9c
cc: Kern Sibbald <kern@sibbald.com>
cc: freebsd-threads@freebsd.org
Subject: Re: FreeBSD pthread_equal "bug"
X-BeenThere: freebsd-threads@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
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: Thu, 05 Jun 2003 11:42:44 -0000

Daniel Eischen wrote:
> Process id's can wrap around so it can eventually happen.
> 
> This is a bug in the application; the implementation is allowed
> to reuse thread id's and there are enough interfaces for an
> application to tell when a thread terminates (pthread_join).
> 
> Perhaps our use of thread id's could be changes so that they
> were cached at the end of the free thread list, but cacheing
> them at the front seems to highlight bad applications, so
> that's a bonus ;-)

So's not explicitly protecting dlopen(), and so's not forcing
rescheduling of the thread that was running at preemption time,
when returning from an involuntary preemption. ;^).

If you're willing to hack around these two, why not the thread
ID as well?  8-) 8-).

-- Terry