From owner-freebsd-arch@FreeBSD.ORG  Thu Nov 13 03:48:49 2014
Return-Path: <owner-freebsd-arch@FreeBSD.ORG>
Delivered-To: freebsd-arch@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id AF3AFE35
 for <freebsd-arch@freebsd.org>; Thu, 13 Nov 2014 03:48:49 +0000 (UTC)
Received: from mail-wi0-x235.google.com (mail-wi0-x235.google.com
 [IPv6:2a00:1450:400c:c05::235])
 (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits))
 (Client CN "smtp.gmail.com",
 Issuer "Google Internet Authority G2" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 3B9BF6EA
 for <freebsd-arch@freebsd.org>; Thu, 13 Nov 2014 03:48:49 +0000 (UTC)
Received: by mail-wi0-f181.google.com with SMTP id n3so6918675wiv.8
 for <freebsd-arch@freebsd.org>; Wed, 12 Nov 2014 19:48:47 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:sender:in-reply-to:references:date:message-id:subject
 :from:to:cc:content-type;
 bh=WmGCOkLotlShEycCdSC8TW4YbwmG5heyo4GcExjOQy4=;
 b=rW74BtqUuKsQNS5vDwp3OORBCTqL7kIe3MWurjMLKA7u35870lHq7zEAO+gKewGIzX
 5Jjxhw/hruk3Z3uJoPaiQOB5w0lW6MtOAsOe3pqRkxnw8Z/cTSjARc/RtmEHg83/EDvB
 H7/wwwwRpNXYaEx2FfkC8iggp+1THwxE3bTzRhW6UEqOMN6JVu1/IPRguQtNvmg7VTVI
 FEav4x//68c4GgnE4lr+Vkjd66nEl79YeitBguLkJjiu5Vd/I9nU0NWBTrbnne77PWjF
 WyClIj4mBT1lbyzZbJ43i1Kvr79FBIeEuTN426JEYW84DfCORDpttFeHhF3j2HuXQmhR
 UJig==
MIME-Version: 1.0
X-Received: by 10.180.99.105 with SMTP id ep9mr10686366wib.26.1415850527580;
 Wed, 12 Nov 2014 19:48:47 -0800 (PST)
Sender: adrian.chadd@gmail.com
Received: by 10.216.106.136 with HTTP; Wed, 12 Nov 2014 19:48:47 -0800 (PST)
In-Reply-To: <CAJ-Vmok-8znyycyOBS_ZQU275zFy+zuZ2C-jt4N3DnuEVS=PWg@mail.gmail.com>
References: <CAJ-VmomrauhCMoF_dZfMWWhZp0EgwfE9RmxL5Pc37PhLSzZ6Qg@mail.gmail.com>
 <20141112212613.21037929@kan>
 <CAJ-Vmok-8znyycyOBS_ZQU275zFy+zuZ2C-jt4N3DnuEVS=PWg@mail.gmail.com>
Date: Wed, 12 Nov 2014 19:48:47 -0800
X-Google-Sender-Auth: HKYgmQIMzIreEQi9h6JX7TnL-EE
Message-ID: <CAJ-Vmo=R4ayAn-d986TC3CzZ4y23jnDW=uTyo4O=x4Ae1wB60A@mail.gmail.com>
Subject: Re: Questions about locking; turnstiles and sleeping threads
From: Adrian Chadd <adrian@freebsd.org>
To: Alexander Kabaev <kabaev@gmail.com>
Content-Type: text/plain; charset=UTF-8
Cc: "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org>
X-BeenThere: freebsd-arch@freebsd.org
X-Mailman-Version: 2.1.18-1
Precedence: list
List-Id: Discussion related to FreeBSD architecture <freebsd-arch.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-arch>,
 <mailto:freebsd-arch-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arch/>
List-Post: <mailto:freebsd-arch@freebsd.org>
List-Help: <mailto:freebsd-arch-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
 <mailto:freebsd-arch-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 13 Nov 2014 03:48:49 -0000

kan pointed out that we should likely do a WITNESS_WARN() in the
relevant spots in the callout code so we catch these before it
happens.

I'll see what we can add to -HEAD to be pro-active about it.

Thanks,



-adrian