Newsgroups: comp.parallel.mpi
From: salo@mrjones.engr.sgi.com (Eric Salo)
Subject: Re: MPI_PROC_NULL and invalid message tags
Organization: Silicon Graphics, Inc.  Mountain View, CA
Date: 3 Mar 1996 02:59:35 GMT
Message-ID: <4hb1un$9t3@murrow.corp.sgi.com>

> Eric, I would argue for the opposite position.  An MPI program has to be
> valid first, then we can check for the various special cases within that
> context.  Similarly, can we give an invalid datatype for a zero-length
> message?  The behaviour after an erroneous call isn't defined (chap. 2).
> This can be used to defend this position (giving an invalid argument makes
> the program erroneous).

Well, then...

What about an invalid pointer for a zero-length message?

Eric Salo         Silicon Graphics Inc.             "Do you know what the
(415)933-2998     2011 N. Shoreline Blvd, 7L-802     last Xon said, just
salo@sgi.com      Mountain View, CA   94043-1389     before he died?"

