[MPI3 Fortran] Fwd: Re: Fwd: [Mpi-comments] MPI 3.0:Fortran 2008 interface - issue with the LOGICAL kind

[Rolf Rabenseifner]

Dear all Fortran group members and MPI implementers,

Is the solution in ticket #364 now also okay for you?

https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/364

Key points have been:

 - All routines with LOGICAL dummy arguments are put into an
   additional routine group.
   Those routines cannot be implemented with BIND(C)
   if the compiler is Fortran standard compliant.
   This does not have any implications for the MPI users,
   except for callback routines.
 - The proposed solution does not require special C based 
   bool datatypes for the normal MPI Fortran programmer 
   when using the mpi_f08 module and typical routines 
   with logical flags like MPI_Test.
 - The abstract interfaces for the callbacks are switched 
   from BIND(C) to non-BIND(C).
   This is the "hard" change in this MPI-3.0 erratum.
   The current definition of the callbacks in mpi_f08
   module was not Fortran compliant. 
   This was detected not earlier.
   It is resolved with this ticket.
   Implication is that also routines with callbacks as
   dummy arguments (e.g. MPI_OP_CREATE) cannot be
   implemented with BIND(C).

The proposal is based on minimal surprise for the MPI users.

Best regards
Rolf

----- Original Message -----
> From: "Bill Long" <longb at cray.com>
> To: "MPI-3 Fortran working group" <mpi3-fortran at lists.mpi-forum.org>
> Sent: Tuesday, March 5, 2013 5:20:53 PM
> Subject: Re: [MPI3 Fortran] Fwd: Re: Fwd: [Mpi-comments] MPI 3.0:Fortran 2008 interface - issue with the LOGICAL kind
> I see. So, we are OK as long as there is no routine that has both a
> choice buffer argument and a LOGICAL argument.
> 
> Cheers,
> Bill
> 
> 
> On 3/5/13 10:07 AM, Rolf Rabenseifner wrote:
> > Bill,
> >
> >> So, you are saying that MPI_SUBARRAYS_SUPPORTED = .true. is not
> >> allowed (page 605 lines 23-30)?
> >
> > No, it is allowed.
> >
> > The important text is p606:45 - p607:3.
> > This is the basis for the "Upgrade" columns in table p609:18-32.
> > These upgrades have MPI_SUBARRAYS_SUPPORTED==.TRUE.
> > although most routine groups are still without BIND(C).
> >
> > Therefore, it is no problem to have no BIND(C) for
> > the new MPI_TEST routine group.
> >
> > Best regards
> > Rolf
> >
> > ----- Original Message -----
> >> From: "Bill Long" <longb at cray.com>
> >> To: "Rolf Rabenseifner" <rabenseifner at hlrs.de>
> >> Cc: "MPI-3 Fortran working group"
> >> <mpi3-fortran at lists.mpi-forum.org>
> >> Sent: Monday, March 4, 2013 5:44:04 PM
> >> Subject: Re: [MPI3 Fortran] Fwd: Re: Fwd: [Mpi-comments] MPI
> >> 3.0:Fortran 2008 interface - issue with the LOGICAL kind
> >> On 3/4/13 10:34 AM, Rolf Rabenseifner wrote:
> >>> Bill,
> >>>
> >>> Without BIND(C), you have to make it according to
> >>> MPI-3.0 page 605, lines 31-38.
> >>
> >> So, you are saying that MPI_SUBARRAYS_SUPPORTED = .true. is not
> >> allowed
> >> (page 605 lines 23-30)?
> >>
> >> This still does not solve the problem of the wrapper names being
> >> inaccessible when only the mpif.h include file is used. Unless, of
> >> course, the include file consists only of "use mpi", but this is
> >> problematic because of statement ordering rules.
> >>
> >> Cheers,
> >> Bill
> >>
> >>>
> >>> Therefore, ticket #364 should work.
> >>>
> >>> Please check again.
> >>>
> >>> Best regards
> >>> Rolf
> >
> 
> --
> Bill Long longb at cray.com
> Fortran Technical Support & voice: 651-605-9024
> Bioinformatics Software Development fax: 651-605-9142
> Cray Inc./Cray Plaza, Suite 210/380 Jackson St./St. Paul, MN 55101
> 
> 
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-- 
Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner at hlrs.de
High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530
University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832
Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner
Nobelstr. 19, D-70550 Stuttgart, Germany . . . . (Office: Room 1.307)