From owner-freebsd-current@FreeBSD.ORG  Thu Aug 19 22:38:12 2004
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 9DFC916A4CF
	for <freebsd-current@freebsd.org>;
	Thu, 19 Aug 2004 22:38:12 +0000 (GMT)
Received: from hanoi.cronyx.ru (hanoi.cronyx.ru [144.206.181.53])
	by mx1.FreeBSD.org (Postfix) with ESMTP id E5FC143D31
	for <freebsd-current@freebsd.org>;
	Thu, 19 Aug 2004 22:38:11 +0000 (GMT)	(envelope-from rik@cronyx.ru)
Received: (from root@localhost) by hanoi.cronyx.ru
  id i7JMZ5Vt067902 for freebsd-current@freebsd.org.checked; (8.12.8/vak/2.1)
  Fri, 20 Aug 2004 02:35:05 +0400 (MSD) (envelope-from rik@cronyx.ru)
Received: from cronyx.ru (hanoi.cronyx.ru [144.206.181.53]) by hanoi.cronyx.ru
	with ESMTP  id i7JMXtCb067859 for <freebsd-current@freebsd.org>;
	(8.12.8/vak/2.1)
	Fri, 20 Aug 2004 02:33:55 +0400 (MSD) (envelope-from rik@cronyx.ru)
Message-ID: <41252924.4020305@cronyx.ru>
Date: Fri, 20 Aug 2004 02:26:44 +0400
From: Roman Kurakin <rik@cronyx.ru>
User-Agent: Mozilla/5.0 (X11; U; Linux i686; ru-RU; rv:1.2.1) Gecko/20030426
X-Accept-Language: ru-ru, en
MIME-Version: 1.0
To: freebsd-current@freebsd.org
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
Subject: Tracking down LORs
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 19 Aug 2004 22:38:12 -0000

Hi,

	Currently I am trying to track down a couple of LORS
in my code. But it seems that I do not undestand smth or all
things id realy so bad.

	So I want to ask some questions to find out if my thoughts
correct or wrong.

1. If I am right LOR means that we have at least two mutexs.
Lets call them a and b. If we set a, then b in first case
and b then a in second we could get dead loop, and thus LOR.

2. If I have some driver that have mutex a, and we have some
sytem code that could call this driver with Giant (b), we would
get LOR if driver lock a and some other part of system will
try to lock Giant?

or I am wrong?

rik