(j3.2006) MPI usage problems in Fortran

[Van Snyder]

On Wed, 2008-03-19 at 15:44 -0400, Dan Nagle wrote:
> Hello,
> 
> On Mar 19, 2008, at 3:33 PM, Bill Long wrote:
> >
> >  Thus, it appears you are required to
> > have an explicit interface, even if the word asynchronous never  
> > appears
> > in any of the declarations, if any of the dummy arguments appears in  
> > an
> > async I/O list.  For a case like that, I don't see how the compiler
> > would deduce anything interesting from the interface, at least related
> > to the side effects of async I/O.
> 
> With a an asynchronous dummy in an explicit interface,
> the compiler knows not to pass by register.  Even if the compiler's
> conventions would otherwise encourage doing so.

What's the harm in this?  The asynchronous attribute applies only to the
scoping unit in which it is declared (or implied).

-- 
Van Snyder                    |  What fraction of Americans believe 
Van.Snyder at jpl.nasa.gov       |  Wrestling is real and NASA is fake?
Any alleged opinions are my own and have not been approved or
disapproved by JPL, CalTech, NASA, the President, or anybody else.