From owner-freebsd-hackers@FreeBSD.ORG  Sun Sep 11 01:17:43 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 358511065670
	for <freebsd-hackers@freebsd.org>; Sun, 11 Sep 2011 01:17:43 +0000 (UTC)
	(envelope-from adrian.chadd@gmail.com)
Received: from mail-yx0-f182.google.com (mail-yx0-f182.google.com
	[209.85.213.182])
	by mx1.freebsd.org (Postfix) with ESMTP id E91528FC16
	for <freebsd-hackers@freebsd.org>; Sun, 11 Sep 2011 01:17:42 +0000 (UTC)
Received: by yxk36 with SMTP id 36so2998348yxk.13
	for <freebsd-hackers@freebsd.org>; Sat, 10 Sep 2011 18:17:42 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma;
	h=mime-version:sender:in-reply-to:references:date
	:x-google-sender-auth:message-id:subject:from:to:cc:content-type;
	bh=h8VZ72jXtORKkhiw8mKU8dB4xVOXFJeAI0hQrWt9Bks=;
	b=Tmw46QIuXJJInE6yZkoiPkZPBtrvlfkDN8NmV7H1nD0Rb7vXDv59Gpzd+hAJste6C5
	Lo4xHlF381Ny4uDhbhN91xKe+ajMZBcK/khYpGl05AHoRcokAJ3NOu2Tm60ch4QZuNAK
	7y9yJhyrDkZck3IyXrAM2goaP/LRI9O63smE8=
MIME-Version: 1.0
Received: by 10.236.173.131 with SMTP id v3mr19568314yhl.112.1315703862008;
	Sat, 10 Sep 2011 18:17:42 -0700 (PDT)
Sender: adrian.chadd@gmail.com
Received: by 10.236.103.6 with HTTP; Sat, 10 Sep 2011 18:17:41 -0700 (PDT)
In-Reply-To: <2778D90F-F718-446E-8ABB-627790F00A93@gmail.com>
References: <023BD0FF-053C-4DCB-81EA-5D69B2411819@gmail.com>
	<CAJ-VmonnTuFyQgBWQRByfhZr=quD0mfmxPc=UFUHTAdBHt+J0g@mail.gmail.com>
	<2778D90F-F718-446E-8ABB-627790F00A93@gmail.com>
Date: Sun, 11 Sep 2011 09:17:41 +0800
X-Google-Sender-Auth: J78OXOpszyRrtSiz0LpG9akUzFk
Message-ID: <CAJ-VmomY7bnzUNoGarHhRPi52-Qbc9CXbmj2+yF2O6y5Wau=FQ@mail.gmail.com>
From: Adrian Chadd <adrian@freebsd.org>
To: Riccardo Cattaneo <cattaneo.riccardo@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Cc: freebsd-hackers@freebsd.org
Subject: Re: Kernel timers infrastructure
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: Sun, 11 Sep 2011 01:17:43 -0000

On 11 September 2011 09:02, Riccardo Cattaneo
<cattaneo.riccardo@gmail.com> wrote:
> Of course, the module from which I'm calling them must be already loaded and initialized, isn't it?
> Riccardo

Well, yes - but then, you can just add something to the module load
code to start off the callout.

There are race conditions to keep in mind though - the callout may
just about to be in-play when you go to remove it. The callout manpage
points out these situations under "Avoiding Race Conditions."


Adrian