Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754007Ab0ADTnS (ORCPT ); Mon, 4 Jan 2010 14:43:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753995Ab0ADTnR (ORCPT ); Mon, 4 Jan 2010 14:43:17 -0500 Received: from ogre.sisk.pl ([217.79.144.158]:55670 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753993Ab0ADTnQ convert rfc822-to-8bit (ORCPT ); Mon, 4 Jan 2010 14:43:16 -0500 From: "Rafael J. Wysocki" To: =?utf-8?q?Bart=C5=82omiej_Zimo=C5=84?= Subject: Re: [suspend/resume] Re: userspace notification from module Date: Mon, 4 Jan 2010 20:43:26 +0100 User-Agent: KMail/1.12.3 (Linux/2.6.33-rc2-tst; KDE/4.3.3; x86_64; ; ) Cc: linux-kernel@vger.kernel.org, awalls@radix.net, danborkmann@googlemail.com, linux-pm@lists.linux-foundation.org, stern@rowland.harvard.edu References: <686edb2c.6263643a.4b3f4a3b.b60b3@o2.pl> <201001040045.39517.rjw@sisk.pl> In-Reply-To: MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 8BIT Message-Id: <201001042043.27037.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1177 Lines: 26 On Monday 04 January 2010, Bartłomiej Zimoń wrote: > Dnia 4 stycznia 2010 0:45 "Rafael J. Wysocki" napisał(a): > > On Monday 04 January 2010, Bartłomiej Zimoń wrote: > > > Thx Rafael - now it clear to me. > > > And what do You think about sending extra signals to processes? > > > > I don't see a problem with this in principle, although I don't think signals > > are very suitable for this particular purpose, because you need two-way > > communication between the power manager and the processes it's going to > > notify (because it has to wait for the processes to finish their preparations > > and to tell it that they are ready). > > > > For this purpose it's better to have a file descriptor you can block on (like a > > socket or a pipe) while the other side is doing it's job. > > > > So let's create one in power/user.c or use /sys/power/state for this :) I don't see a good reason, really. Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/