From owner-freebsd-questions@FreeBSD.ORG  Tue May 19 00:32:48 2009
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 2DB59106566B
	for <freebsd-questions@freebsd.org>;
	Tue, 19 May 2009 00:32:48 +0000 (UTC)
	(envelope-from psteele@maxiscale.com)
Received: from exprod7og125.obsmtp.com (exprod7og125.obsmtp.com [64.18.2.28])
	by mx1.freebsd.org (Postfix) with SMTP id DF1B38FC0A
	for <freebsd-questions@freebsd.org>;
	Tue, 19 May 2009 00:32:47 +0000 (UTC)
	(envelope-from psteele@maxiscale.com)
Received: from source ([209.85.222.106]) by exprod7ob125.postini.com
	([64.18.6.12]) with SMTP
	ID DSNKShH+L5VhuRP7eHYzZzqSJbwQQxyVvrBH@postini.com;
	Mon, 18 May 2009 17:32:48 PDT
Received: by pzk4 with SMTP id 4so2160127pzk.7
	for <freebsd-questions@freebsd.org>;
	Mon, 18 May 2009 17:32:47 -0700 (PDT)
Received: by 10.115.50.5 with SMTP id c5mr12535050wak.7.1242693167190;
	Mon, 18 May 2009 17:32:47 -0700 (PDT)
Received: from localhost ([76.231.178.131])
	by mx.google.com with ESMTPS id j15sm5962261waf.64.2009.05.18.17.32.45
	(version=SSLv3 cipher=RC4-MD5); Mon, 18 May 2009 17:32:46 -0700 (PDT)
Date: Mon, 18 May 2009 17:32:45 -0700 (PDT)
From: Peter Steele <psteele@maxiscale.com>
To: #freebsd-questions <freebsd-questions@freebsd.org>
Message-ID: <25097232.1021242693162151.JavaMail.HALO$@halo>
In-Reply-To: <70C0964126D66F458E688618E1CD008A0793ED2E@WADPEXV0.waddell.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
X-Content-Filtered-By: Mailman/MimeDel 2.1.5
Subject: Re: Why would a kill -2 not work?
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 19 May 2009 00:32:48 -0000

>You're not trying to send a signal within the signal handler itself, 
>are you? That won't work-- signal delivery is blocked when you're 
>already running in a signal handler. Also, note that trying to mix 
>signals with a multithreaded process is complicated.... 

No, I'm not sending a signal within a signal. The signal handler is this: 

pthread_mutex_lock(&keep_running_mutex); 
KEEP_RUNNING = 0; 
pthread_cond_signal(&keep_running_cond); 
pthread_mutex_unlock(&keep_running_mutex); 

This works fine, but at some point it seems to stop working. The app just continues to run as if it never received the -2 signal. We have to use a kill -9 to kill it, which we want to avoid because this prevents our shutdown code from executing.