Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755062Ab1FDMDT (ORCPT ); Sat, 4 Jun 2011 08:03:19 -0400 Received: from ccserver1.unican.es ([130.206.5.100]:55683 "EHLO ccserver1.unican.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752303Ab1FDMDS (ORCPT ); Sat, 4 Jun 2011 08:03:18 -0400 Message-ID: <4DEA1F22.6000603@unican.es> Date: Sat, 4 Jun 2011 14:03:46 +0200 From: Monica Puig-Pey User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.17) Gecko/20110424 Thunderbird/3.1.10 MIME-Version: 1.0 To: , Subject: I/O operations priority in RTOS References: <4DEA1BA9.7020303@unican.es> In-Reply-To: <4DEA1BA9.7020303@unican.es> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [193.144.198.131] X-imss-version: 2.054 X-imss-result: Passed X-imss-scanInfo: M:P L:E SM:0 X-imss-tmaseResult: TT:0 TS:0.0000 TC:00 TRN:0 TV:6.5.1024(18178.007) X-imss-scores: Clean:94.06621 C:2 M:3 S:5 R:5 X-imss-settings: Baseline:1 C:1 M:2 S:2 R:2 (0.0000 0.0000) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 736 Lines: 16 Hello, I'm studying how to develop drivers in a real time OS and how do they work. I'm using Ubuntu 10.04 with the 2.6.31-11-rt patch installed. I would like to know the priority when executing open(), read(), write() and close() operations. In my example the thread which is using the driver runs with 10 RTPRIO, but I don't know what happens in kernel context with the priority when running the I/O operations. Thank you for your help, I don't know where to learn about this. M?nica -- 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/