From owner-freebsd-threads@FreeBSD.ORG  Tue Nov  4 15:41:14 2008
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 1355D1065688
	for <freebsd-threads@FreeBSD.org>; Tue,  4 Nov 2008 15:41:14 +0000 (UTC)
	(envelope-from bright@elvis.mu.org)
Received: from elvis.mu.org (elvis.mu.org [192.203.228.196])
	by mx1.freebsd.org (Postfix) with ESMTP id F30A18FC19
	for <freebsd-threads@FreeBSD.org>; Tue,  4 Nov 2008 15:41:13 +0000 (UTC)
	(envelope-from bright@elvis.mu.org)
Received: by elvis.mu.org (Postfix, from userid 1192)
	id A970A1A3C4B; Tue,  4 Nov 2008 07:41:13 -0800 (PST)
Date: Tue, 4 Nov 2008 07:41:13 -0800
From: Alfred Perlstein <alfred@freebsd.org>
To: Ed Maste <emaste@freebsd.org>
Message-ID: <20081104154113.GP60438@elvis.mu.org>
References: <200811041440.mA4Ee31J084489@freefall.freebsd.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <200811041440.mA4Ee31J084489@freefall.freebsd.org>
User-Agent: Mutt/1.4.2.3i
Cc: freebsd-threads@FreeBSD.org
Subject: Re: threads/128180: pthread_cond_broadcast(3) lost wakeup
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: Tue, 04 Nov 2008 15:41:14 -0000

* Ed Maste <emaste@freebsd.org> [081104 06:40] wrote:
> The following reply was made to PR threads/128180; it has been noted by GNATS.
> 
> From: Ed Maste <emaste@freebsd.org>
> To: bug-followup@FreeBSD.org, kurt@intricatesoftware.com
> Cc:  
> Subject: Re: threads/128180: pthread_cond_broadcast(3) lost wakeup
> Date: Tue, 4 Nov 2008 09:09:38 -0500
> 
>  > The test program doesn't look correct to me. It seems possible
>  > for only a few of the threads (as little as 2) to do all the
>  > work. Thread 1 can start doing work, then wait for a broadcast.
>  > Thread 2 can start doing his work, then broadcast waking thread 1.
>  
>  It looks to me like the "tickets" and "finished" globals should make
>  the test program operate correctly.  If the scenario you describe
>  happens, thread 1 will just enter pthread_cond_wait again and wait
>  for the broadcast from the primordial thread.

This bug may have been fixed in 6-stable and 6.4.

http://svn.freebsd.org/viewvc/base?view=revision&revision=184172

Can you try upgrading?

-- 
- Alfred Perlstein