From owner-freebsd-hackers@FreeBSD.ORG  Sat Feb  5 21:40:11 2011
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id C9FBF1065672;
	Sat,  5 Feb 2011 21:40:11 +0000 (UTC)
	(envelope-from ivoras@gmail.com)
Received: from mail-qy0-f175.google.com (mail-qy0-f175.google.com
	[209.85.216.175])
	by mx1.freebsd.org (Postfix) with ESMTP id 6B7888FC19;
	Sat,  5 Feb 2011 21:40:10 +0000 (UTC)
Received: by qyk8 with SMTP id 8so491079qyk.13
	for <multiple recipients>; Sat, 05 Feb 2011 13:40:08 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma;
	h=domainkey-signature:mime-version:sender:in-reply-to:references:from
	:date:x-google-sender-auth:message-id:subject:to:cc:content-type;
	bh=A1l8gwYWrlD05yIi2lzVHkTOTmgCBLJenDAoYcHSjWM=;
	b=jB6IyHvOgAH66IFyyUNiXpt8vbQproezMlY06TPR9y7p6HP81IJ75qwdD76+VDWNWa
	cq+myVZ6nSDgNjtwgaQGl7ByOCqaZyUJB0+2HC2MyV1yDpcQ30wEmhWA+SoickUKr6EB
	fcxn/yB/9onCF/9OqxuRTpvWJZWxPtF/0r3Kg=
DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma;
	h=mime-version:sender:in-reply-to:references:from:date
	:x-google-sender-auth:message-id:subject:to:cc:content-type;
	b=sfUvIwuO6yk02Bqu/cxK3kCmZOpcv14+mlY2lwBE9TLau88majw+qRbKw5H/+rJxbC
	dGYLkpLdYggQZ2OHTaqBhn2TU7/GW/PuYE5Nn63rVVjuPVaipvV3B1xbeyceKUf8jp8B
	iP05qNm85Bv2nTx/p48PchlhrSSO5GkGyVd3A=
Received: by 10.229.228.2 with SMTP id jc2mr11401380qcb.177.1296942007584;
	Sat, 05 Feb 2011 13:40:07 -0800 (PST)
MIME-Version: 1.0
Sender: ivoras@gmail.com
Received: by 10.229.67.2 with HTTP; Sat, 5 Feb 2011 13:39:26 -0800 (PST)
In-Reply-To: <AANLkTik-0GT6uyUOYS=gDUVr_D0NvSGi81MsqNZr=2HK@mail.gmail.com>
References: <4D3CB2AF.9050003@yandex.ru> <ihk0a9$2on$1@dough.gmane.org>
	<4D4D9A4D.2070508@yandex.ru>
	<AANLkTikUX64+t_TW=9kzAzMDbHmjYqiSZhsKC8+nNoak@mail.gmail.com>
	<4D4DAD05.2070707@yandex.ru>
	<AANLkTik-0GT6uyUOYS=gDUVr_D0NvSGi81MsqNZr=2HK@mail.gmail.com>
From: Ivan Voras <ivoras@freebsd.org>
Date: Sat, 5 Feb 2011 22:39:26 +0100
X-Google-Sender-Auth: bI7hc-oS2OADHJx8mAy02IJqqoU
Message-ID: <AANLkTikT56duTcwRTn6za3wpqhSEKYR+Xiygr=0MoXWh@mail.gmail.com>
To: Ruslan Mahmatkhanov <cvs-src@yandex.ru>
Content-Type: text/plain; charset=UTF-8
Cc: freebsd-hackers@freebsd.org, davidxu@freebsd.org
Subject: Re: Tracking down a problem with php on FreeBSD
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 05 Feb 2011 21:40:11 -0000

On 5 February 2011 21:22, Ivan Voras <ivoras@freebsd.org> wrote:
> On 5 February 2011 21:03, Ruslan Mahmatkhanov <cvs-src@yandex.ru> wrote:
>
>>
>> Can you please tell me more what you mean by ""robust" pthreads mutexes" and
>
> It's just a name for properties of a mutex; actually this is
> imprecise, what's needed here is process-shared & robust
> (fpm_shm_slots.c: FPM uses shared memory).

Actually I think "robustness" is the key here (in this context it
means that the locks of a thread / processes are released if a thread
/ process dies unexpectedly (crashes)); It is very likely that in your
case the PHP process with FPM SAPI module dies while holding a lock
shared between processes and the other processes get stuck waiting for
this lock to unlock.