From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 30432 invoked by alias); 28 May 2009 08:50:47 -0000 Received: (qmail 30419 invoked by uid 22791); 28 May 2009 08:50:46 -0000 X-SWARE-Spam-Status: No, hits=-2.9 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_LOW X-Spam-Check-By: sourceware.org Received: from anchor-post-2.mail.demon.net (HELO anchor-post-2.mail.demon.net) (195.173.77.133) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 28 May 2009 08:50:38 +0000 Received: from calivar.demon.co.uk ([83.104.54.243] helo=xl5.calivar.com) by anchor-post-2.mail.demon.net with esmtp (Exim 4.69) id 1M9bJs-0006BQ-jr; Thu, 28 May 2009 08:50:36 +0000 Received: from xl5.calivar.com (localhost [127.0.0.1]) by xl5.calivar.com (Postfix) with ESMTP id 6551E1386AA; Thu, 28 May 2009 09:50:35 +0100 (BST) To: Mervin J Cc: ecos-discuss@sourceware.org References: <4A1E0802.7080007@cms.com> From: Nick Garnett Original-Sender: nickg@ecoscentric.com Date: Thu, 28 May 2009 08:50:00 -0000 In-Reply-To: <4A1E0802.7080007@cms.com> Message-ID: User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Mailing-List: contact ecos-discuss-help@ecos.sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: ecos-discuss-owner@ecos.sourceware.org Subject: Re: [ECOS] Posix with Bitmap scheduling X-SW-Source: 2009-05/txt/msg00128.txt.bz2 Mervin J writes: > Hi, > I am working on ecos for arm7. Since my application is simple, I > plan to use Bitmap scheduling. While adding Posix support i was not > able to build the source. Whether posix and Bitmap scheduling is not > possible? The POSIX standard requires certain functionality of the scheduler. This can only be supplied by the MLQ scheduler. The memory overhead of the MLQ scheduler over the bitmap scheduler is fairly small, particularly if you have already accepted the code and data impact of using POSIX. -- Nick Garnett eCos Kernel Architect eCosCentric Limited http://www.eCosCentric.com The eCos experts Barnwell House, Barnwell Drive, Cambridge, UK. Tel: +44 1223 245571 Registered in England and Wales: Reg No: 4422071 -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss