From owner-sc22wg5@open-std.org Tue Jun 9 11:39:07 2009 Return-Path: X-Original-To: sc22wg5-dom7 Delivered-To: sc22wg5-dom7@www2.open-std.org Received: by www2.open-std.org (Postfix, from userid 521) id 03792C178DF; Tue, 9 Jun 2009 11:39:07 +0200 (CET DST) X-Original-To: sc22wg5@open-std.org Delivered-To: sc22wg5@open-std.org Received: from ppsw-6.csi.cam.ac.uk (ppsw-6.csi.cam.ac.uk [131.111.8.136]) by www2.open-std.org (Postfix) with ESMTP id 625C8C178DC for ; Tue, 9 Jun 2009 11:38:41 +0200 (CET DST) X-Cam-AntiVirus: no malware found X-Cam-SpamDetails: not scanned X-Cam-ScannerInfo: http://www.cam.ac.uk/cs/email/scanner/ Received: from hermes-2.csi.cam.ac.uk ([131.111.8.54]:46573) by ppsw-6.csi.cam.ac.uk (smtp.hermes.cam.ac.uk [131.111.8.156]:25) with esmtpa (EXTERNAL:nmm1) id 1MDxmz-0001q2-K5 (Exim 4.70) for sc22wg5@open-std.org (return-path ); Tue, 09 Jun 2009 10:38:41 +0100 Received: from prayer by hermes-2.csi.cam.ac.uk (hermes.cam.ac.uk) with local (PRAYER:nmm1) id 1MDxmz-0008QY-6v (Exim 4.67) for sc22wg5@open-std.org (return-path ); Tue, 09 Jun 2009 10:38:41 +0100 Received: from [131.111.10.32] by webmail.hermes.cam.ac.uk with HTTP (Prayer-1.3.1); 09 Jun 2009 10:38:41 +0100 Date: 09 Jun 2009 10:38:41 +0100 From: "N.M. Maclaren" To: wg5 Subject: Re: [ukfortran] (SC22WG5.3997) New summary of coarrays Message-ID: In-Reply-To: <20090609092023.32AF5C178DC@www2.open-std.org> References: <20090609092023.32AF5C178DC@www2.open-std.org> X-Mailer: Prayer v1.3.1 Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset=ISO-8859-1 Sender: owner-sc22wg5@open-std.org Precedence: bulk I would add something to the end of section 15.3, along the lines of: While the atomic subroutines are very simple, their consequences are not, and the effect of interleaving atomic actions in multiple images may vary between compilers. In some cases, they will appear to be globally consistent, but may not do so under all compilers. The exact details are intentionally left processor dependent, and programmers should read their compiler's release notes before using atomic subroutines. Regards, Nick Maclaren, University of Cambridge Computing Service, New Museums Site, Pembroke Street, Cambridge CB2 3QH, England. Email: nmm1@cam.ac.uk Tel.: +44 1223 334761 Fax: +44 1223 334679