From mboxrd@z Thu Jan 1 00:00:00 1970 From: Armin Steinhoff Subject: Re: I/O operations priority in RTOS Date: Sun, 05 Jun 2011 10:46:55 +0200 Message-ID: <4DEB427F.9020104@steinhoff.de> References: <4DEA1BA9.7020303@unican.es> <4DEA1F22.6000603@unican.es> <20110604234214.GA30640@opentech.at> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Cc: Monica Puig-Pey , linux-rt-users@vger.kernel.org To: Nicholas Mc Guire Return-path: Received: from moutng.kundenserver.de ([212.227.17.10]:59805 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755328Ab1FEIhZ (ORCPT ); Sun, 5 Jun 2011 04:37:25 -0400 In-Reply-To: <20110604234214.GA30640@opentech.at> Sender: linux-rt-users-owner@vger.kernel.org List-ID: Nicholas Mc Guire wrote: > On Sat, 04 Jun 2011, Monica Puig-Pey wrote: > >> 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. >> > [] > Also when using bottom half mechanisms you need to take into account the > priority of the kernel thread that manages the defered work items, so > rt-drivers may have a different structure than normal drivers. That's the reason why I prefer UIO based user space drivers ! --Armin > hofrat > -- > To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >