From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752888Ab0ADAvo (ORCPT ); Sun, 3 Jan 2010 19:51:44 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752005Ab0ADAvl (ORCPT ); Sun, 3 Jan 2010 19:51:41 -0500 Received: from rekin23.go2.pl ([193.17.41.16]:45406 "EHLO rekin23.go2.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751490Ab0ADAvl convert rfc822-to-8bit (ORCPT ); Sun, 3 Jan 2010 19:51:41 -0500 Subject: =?UTF-8?Q?Re:_[suspend/resume]_Re:_userspace_notification_from_module?= From: =?UTF-8?Q?Bart=C5=82omiej_Zimo=C5=84?= To: linux-kernel@vger.kernel.org Cc: rjw@sisk.pl, awalls@radix.net, danborkmann@googlemail.com, linux-pm@lists.linux-foundation.org, stern@rowland.harvard.edu In-Reply-To: <201001040045.39517.rjw@sisk.pl> References: <686edb2c.6263643a.4b3f4a3b.b60b3@o2.pl> <201001040030.01256.rjw@sisk.pl> <54ac764e.502c1a33.4b4129c3.9dc1b@o2.pl> <201001040045.39517.rjw@sisk.pl> Mime-Version: 1.0 Message-ID: Date: Mon, 04 Jan 2010 01:51:40 +0100 X-Originator: 83.12.131.34 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 :) Best regards. Bartłomiej Zimoń PLD Linux, Kadu Team, FreeRunner user http://kadu-im.blogspot.com/