[MPIWG Fortran] Question on Fortran binding errata

[Craig Rasmussen]

We realized after working on MPI-3 for awhile that we would need Fortran wrappers and couldn't really call C routines directly.  One of the reasons is that the MPI C routines return a function value and most of the Fortran bindings are subroutines without a return value.  The language you refer to is a requirement on the implementer as to what the name of the wrapper routine is.

For example, if the user calls MPI_Isend and uses the MPI_F08 module, then the wrapper routine shall (must) be called MPI_Isend_f08.  Another requirement we have placed on implementors is that the wrapper name can't be hidden within a module so that Fortran module name mangling won't be done for the MPI_Isend_f08 routine.

Craig Rasmussen
CAS Scientific Programmer
rasmus at cas.uoregon.edu




On Feb 12, 2014, at 1:28 PM, Junchao Zhang wrote:

> Hello, 
>   On page 10, line 38 of the errata, http://www.mpi-forum.org/docs/mpi-3.0/errata-30.pdf, it reads
> 
> A Fortran call to an MPI routine shall result in a call to a procedure with one of the
> specific procedure names and calling conventions, as described in Table 1.1 on page 11.
> Case is not significant in the names.
> 
>    Can someone explain it a little more, especially, what is the meaning of "specific procedure names"?
>    Thank you.
> 
> --Junchao Zhang
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