From owner-freebsd-threads@FreeBSD.ORG  Wed Mar 24 15:56:37 2010
Return-Path: <owner-freebsd-threads@FreeBSD.ORG>
Delivered-To: freebsd-threads@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 26E591065672;
	Wed, 24 Mar 2010 15:56:37 +0000 (UTC)
	(envelope-from pldrouin@pldrouin.net)
Received: from smtp.cyberfingers.net (smtp.cyberfingers.net [198.177.254.227])
	by mx1.freebsd.org (Postfix) with ESMTP id 0390C8FC0A;
	Wed, 24 Mar 2010 15:56:36 +0000 (UTC)
Received: from [134.117.23.34] (pldrouinlap2-pc.physics.carleton.ca
	[134.117.23.34])
	by smtp.cyberfingers.net (Postfix) with ESMTP id 065E7AB6C26;
	Wed, 24 Mar 2010 11:56:35 -0400 (EDT)
Message-ID: <4BAA3632.7030309@pldrouin.net>
Date: Wed, 24 Mar 2010 11:56:34 -0400
From: Pierre-Luc Drouin <pldrouin@pldrouin.net>
User-Agent: Thunderbird 2.0.0.24 (X11/20100317)
MIME-Version: 1.0
To: Daniel Eischen <deischen@freebsd.org>
References: <4BA64260.5000009@pldrouin.net>
	<Pine.GSO.4.64.1003211246350.5093@sea.ntplx.net>
	<4BA6A2C5.3030808@pldrouin.net>
	<Pine.GSO.4.64.1003221153140.9723@sea.ntplx.net>
In-Reply-To: <Pine.GSO.4.64.1003221153140.9723@sea.ntplx.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: freebsd-threads@freebsd.org
Subject: Re: Portable Conditional Wait for Inter-Process?
X-BeenThere: freebsd-threads@freebsd.org
X-Mailman-Version: 2.1.5
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: Wed, 24 Mar 2010 15:56:37 -0000

Hi,

finally what I did is to create an array in a shared memory segment (I 
was already using shared memory for these processes) where I write the 
PIDs of the waiters such that the other process can SIGALRM them when it 
is ready. The waiters wait for this signal with sigtimedwait and the 
other process SIGALRM them as well if a signal is sent to it. I use a 
lock-free algorithm with atomic primitives to save and load the PIDs to 
the shared segment. It seems to be working quite well.

Thanks

Daniel Eischen wrote:
> On Sun, 21 Mar 2010, Pierre-Luc Drouin wrote:
>
>> Regarding process groups, how can I set two processes to belong to 
>> the same process group if they don't have a parent-child relation?
>>
>> Thanks!
>
> Well, from skimming the man pages, I don't think you can
> do that.  You can't somehow launch your clients and server from
> the same parent?
>