From owner-sc22wg5@open-std.org Thu Jan 22 17:09:14 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 4D5FFCA5FE6; Thu, 22 Jan 2009 17:09:14 +0100 (CET) X-Original-To: sc22wg5@open-std.org Delivered-To: sc22wg5@open-std.org Received: from mail1.cray.com (mail1.cray.com [136.162.0.111]) by www2.open-std.org (Postfix) with ESMTP id 16079CA3439 for ; Thu, 22 Jan 2009 17:09:11 +0100 (CET) Received: from beaver.us.cray.com (beaver.us.cray.com [172.30.74.51]) by mail1.cray.com (8.13.6/8.13.3/gw-5323) with ESMTP id n0MG8ufb001365 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Thu, 22 Jan 2009 10:08:56 -0600 (CST) Received: from CFEXFE01.us.cray.com (cfexfe01.us.cray.com [172.30.74.93]) by beaver.us.cray.com (8.13.8/8.13.3/hub-5273) with ESMTP id n0MG8s0t016922; Thu, 22 Jan 2009 10:08:54 -0600 Received: from mh-dhcp-172-31-16-180.us.cray.com ([172.31.16.180]) by CFEXFE01.us.cray.com over TLS secured channel with Microsoft SMTPSVC(6.0.3790.3959); Thu, 22 Jan 2009 10:08:54 -0600 Message-ID: <49789AC3.4010203@cray.com> Date: Thu, 22 Jan 2009 10:11:47 -0600 From: Bill Long Reply-To: longb@cray.com Organization: Cray Inc. User-Agent: Thunderbird 2.0.0.9 (Macintosh/20071031) MIME-Version: 1.0 To: fortran standards email list for J3 Cc: Van.Snyder@jpl.nasa.gov, WG5 , MPI-3 Fortran working group Subject: Re: (j3.2006) (SC22WG5.3886) [ukfortran] [MPI3 Fortran] MPI non-blocking transfers References: <49776DF7.1040900@cray.com> <20090121211748.130A5C178D9@www2.open-std.org> <20090121224014.6CB63C178D9@www2.open-std.org> <20090121234200.4F3BDCA3434@www2.open-std.org> <20090122000407.D5A8ECA3434@www2.open-std.org> <20090122100652.C31E9CA3434@www2.open-std.org> In-Reply-To: <20090122100652.C31E9CA3434@www2.open-std.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 22 Jan 2009 16:08:54.0860 (UTC) FILETIME=[B967A8C0:01C97CAB] X-Cray-VirusStatus: clean Sender: owner-sc22wg5@open-std.org Precedence: bulk Adding the MPI list back into the reply. Please use "reply all" for this discussion.... N.M. Maclaren wrote: > On Jan 22 2009, Van Snyder wrote: > > >> One simple step toward solving the problem is to write an extra >> interface layer that includes the argument, which then calls the real >> MPI wait routine, not passing that argument. Then declaring the buffer >> and the dummy argument of the wait routine interface layer to be >> ASYNCHRONOUS ought to work, according to the rules we already have in >> place for Fortran asynchronous I/O. >> The basic problem with adding a buffer argument to a variant of the MPI_wait routines is that the buffer variable may not be accessible in the scoping unit of the call. This seems like a fatal flaw with this approach. Cheers, Bill -- Bill Long longb@cray.com Fortran Technical Support & voice: 651-605-9024 Bioinformatics Software Development fax: 651-605-9142 Cray Inc., 1340 Mendota Heights Rd., Mendota Heights, MN, 55120