For those of us who are clearly missing some pieces here, could you write out the full interfaces for the 4 routines mentioned below? Thanks. Cheers, Bill On 6/20/11 1:09 PM, Rasmussen, Craig E wrote:

No, the status variable will be of type(MPI_Status) and will be made "optional" through overloading. Only the IERROR will have the optional attribute. We felt it would complicate things if more that one variable had the optional attribute. Please comment on this choice, perhaps there is a better way for the status variable to be optional.

The goal is to allow a user to pass MPI_STATUS_IGNORE for the status variable or to not pass a status variable at all. The results would be the same for both calls.

-craig

On Jun 20, 2011, at 11:42 AM, Bill Long wrote:

...

Hi Craig,

The "status variable" is the IERROR argument that comes last in the argument list, right? If so, then it would seem easier to declare that as optional. If the interfaces are declared bind(c) in Fortran, then a C version of the routine would know how to handle the optional argument. That would allow getting rid of the _nostatus versions. Given the number of MPI routines, cutting the list below by a factor of 2 seems like a big win.

Cheers, Bill

On 6/20/11 12:15 PM, Rasmussen, Craig E wrote:

...

I've talked with Jeff Squyres and we come up with naming convention that we'd like to propose for tools to have access to Fortran.

I believe we need four different symbol naming conventions. Consider MPI_Recv(), the four functions are

1. mpi_recv_f - This function implements (in C or Fortran) MPI_Recv with integer handles and the choice buffer passed by address.

2. mpi_recv_f_nostatus - This function implements (in C or Fortran) MPI_Recv with integer handles without a status variable and the choice buffer passed by address.

3. mpi_recv_f08 - This function implements (in C or Fortran) MPI_Recv with integer handles and the choice buffer passed via an array descriptor.

4. mpi_recv_f_nostatus - This function implements (in C or Fortran) MPI_Recv with integer handles without a status variable and the choice buffer passed via an array descriptor.

Note that these functions only need to support integer handles because of the way we (thanks to Rolf) have chosen to define the handle types in the mpi_f08 module.

Please comment on this naming convention.

-craig

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-- Bill Long [email protected] 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