[MPI3 Fortran] Sample implementation

[Supalov, Alexander]

Dear Jeff,

You're right, attribute management may be a little hard on the initial
prototype. The difference of the handle representation will best be
addressed by trying the prototype against MPICH2, etc. We can take care
of a part of that if you wish, once the prototype becomes available.

Best regards.

Alexander

-----Original Message-----
From: mpi3-fortran-bounces at lists.mpi-forum.org
[mailto:mpi3-fortran-bounces at lists.mpi-forum.org] On Behalf Of Jeff
Squyres
Sent: Tuesday, April 22, 2008 6:02 PM
To: MPI-3 Fortran working group
Subject: Re: [MPI3 Fortran] Sample implementation

On Apr 22, 2008, at 10:33 AM, Supalov, Alexander wrote:

> Thanks. I'd suggest adding some attribute copy/delete functions,
>

Ah, I didn't initially put those in the list because I put in  
ERRHANDLER functions (i.e., function pointer arguments) -- but you're  
pointing out that we should also do the whole extraordinarily- 
confusing attribute conversion stuff, right?

Should we open the possibility of treating F2003 attributes exactly  
like C attributes?  This would make the attribute situation far less  
confusing than it is now, IMNSHO...

> MPI_Request that is sometimes handled differently than other handles
> (you'll have them anyway with MPI_ISEND I guess), and MPI_WTIME, as a
> "real" function.
>

MPI_WTIME -- good call; let's add that to the list.

> MPI_File is a good example of a handle that is a pointer rather than  
> an
> integer in MPICH2, but that's probably too far away from the scope of
> this prototype.
>

Ah, I wasn't aware of that.  In OMPI, all of our handles are pointers,  
so I think if we cover a few types (eg., communicator and datatype) in  
the sample with OMPI and some other MPI that uses integers, we'll be  
covered.

So here's a new list:

6-function MPI
- MPI_INIT
- MPI_FINALIZE
- MPI_SEND
- MPI_RECV
- MPI_COMM_RANK
- MPI_COMM_SIZE
Some non-blocking functions
- MPI_ISEND
- MPI_IRECV
- MPI_WAITALL
A function with a string
- MPI_GET_PROCESSOR_NAME
Memory pointers
- MPI_ALLOC_MEM
- MPI_FREE_MEM
Varargs
- MPI_PCONTROL
Functions dealing with function pointers
- MPI_COMM_ERRHANDLER_SET
- MPI_COMM_ERRHANDLER_GET

Returns double

- MPI_WTIME

Along with at least the following pre-defined MPI handles (others can
be included of course):

Basic handles
- MPI_INTEGER
- MPI_COMM_WORLD
"Weird" handles
- MPI_BOTTOM
- MPI_STATUSES_IGNORE
Function pointer handle
- MPI_ERRORS_ARE_FATAL



-- 
Jeff Squyres
Cisco Systems

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