From owner-freebsd-current@freebsd.org  Wed Jul 29 13:44:19 2015
Return-Path: <owner-freebsd-current@freebsd.org>
Delivered-To: freebsd-current@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 012009AC850
 for <freebsd-current@mailman.ysv.freebsd.org>;
 Wed, 29 Jul 2015 13:44:19 +0000 (UTC)
 (envelope-from etnapierala@gmail.com)
Received: from mail-la0-x233.google.com (mail-la0-x233.google.com
 [IPv6:2a00:1450:4010:c03::233])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (Client CN "smtp.gmail.com",
 Issuer "Google Internet Authority G2" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 872DF1F3F
 for <freebsd-current@freebsd.org>; Wed, 29 Jul 2015 13:44:18 +0000 (UTC)
 (envelope-from etnapierala@gmail.com)
Received: by laah7 with SMTP id h7so6555402laa.0
 for <freebsd-current@freebsd.org>; Wed, 29 Jul 2015 06:44:16 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=sender:date:from:to:cc:subject:message-id:mail-followup-to
 :references:mime-version:content-type:content-disposition
 :in-reply-to:user-agent;
 bh=uZXsXQsgwShd5tOT6y/33W6af7C6r2kZbEp8USwGBVU=;
 b=yvbgFP84Poe+qsozdDNSm2jfPUM7byCJyb6zewFkSxUp5Qozz1JmTDmGBtGK4Jdn0F
 a3tHKc8VxcB9GDMD0SxEDo9TbHIhV05XPqnaaywpSQGHPpVGByWI6nuM9xgcrP9NXWnN
 Qp8QVwrl7xP7rdzZbeMGABxn9CqF2x3yy36U91zB4wSojncA4r7M2kYbURMl0cZt8vRy
 n12KC4iegoI2Dp47e5uiibGNI26idTfS3+L/BGRPdHa/OwHpQLyHNVBcT9WKSD8K0rTd
 QayusInJQ7+AqD5Vdr/MfodxT/Y5swL38mqvoAZGPuZq0XKb6BZsKdE8kHkwd8tbvKMT
 iA+A==
X-Received: by 10.112.105.104 with SMTP id gl8mr39055858lbb.81.1438177456698; 
 Wed, 29 Jul 2015 06:44:16 -0700 (PDT)
Received: from brick ([46.229.149.194])
 by smtp.gmail.com with ESMTPSA id kb5sm5336066lbc.16.2015.07.29.06.44.14
 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
 Wed, 29 Jul 2015 06:44:15 -0700 (PDT)
Sender: =?UTF-8?Q?Edward_Tomasz_Napiera=C5=82a?= <etnapierala@gmail.com>
Date: Wed, 29 Jul 2015 15:44:11 +0200
From: Edward Tomasz =?utf-8?Q?Napiera=C5=82a?= <trasz@FreeBSD.org>
To: Luigi Rizzo <rizzo@iet.unipi.it>
Cc: freebsd-current@freebsd.org
Subject: Re: eventfd lookalike in FreeBSD ?
Message-ID: <20150729134411.GE1549@brick>
Mail-Followup-To: Luigi Rizzo <rizzo@iet.unipi.it>, freebsd-current@freebsd.org
References: <20150728121949.GA64588@onelab2.iet.unipi.it>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20150728121949.GA64588@onelab2.iet.unipi.it>
User-Agent: Mutt/1.5.23 (2014-03-12)
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.20
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
 <freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current/>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
 <mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 29 Jul 2015 13:44:19 -0000

On 0728T1419, Luigi Rizzo wrote:
> Hi,
> for some work we are doing on bhyve, we need some lightweight mechanism that
> a kernel thread can use to wake up another user thread possibly
> waiting for some event.

https://reviews.freebsd.org/D2172