Hi Alexander, Jeff and Torsten are right. We have special implementations for frequently used Fortran functions. But this Fortran MPI functions are implemented in C. I think, that it will be difficult to convince real Fortran programmers by this C interface. They have to re-write main parts of the code. change it from Fortran Style into C Style and what is the benefit ? I have an additional question. Is this really guaranteed by the Fortran 2003 standard that type, bind(C) :: MPI_HANDLE private ! Components not visible type(C_PTR) :: HANDLE end type MPI_HANDLE type, bind(C) :: MPI_COMM private type(MPI_HANDLE) :: handle end type MPI_COMM type(MPI_COMM), bind(C), protected :: MPI_COMM_WORLD err = MPI_Recv (..., ..., MPI_COMM_WORLD, ...) in the same C Pointer such as the MPI_Comm MPI_COMM_WORLD ? My feeling is that it points to a structure containing the C pointer MPI_COMM_WORLD. Hubert Supalov, Alexander wrote:

Hi everybody,

It appears to me that the current proposal basically intends to pass data thru to the presumably existing C implementation layer. How will this work for an implementation where the Fortran binding is a primary one?

I believe that at least NEC has followed this route. I'm adding Hubert Ritzdorf, in case he's accidentally not involved into this discussion yet, to verify NEC's position.

Best regards.

Alexander

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