Barry Smith <bsm...@mcs.anl.gov> writes: >> On Oct 24, 2017, at 6:58 AM, Jed Brown <j...@jedbrown.org> wrote: >> >> Lawrence Mitchell <wen...@gmail.com> writes: >> >>>> On 24 Oct 2017, at 06:21, Barry Smith <bsm...@mcs.anl.gov> wrote: >>>> >>>>>>> - With PetscSFBcastBegin() / PetscSFBcastEnd() you currently still have >>>>>>> to use the C MPI types in the Fortran calling code, rather than the >>>>>>> Fortran ones. I think it is a bit confusing to have to mix the two up >>>>>>> in the same code. If you put MPI_INTEGER instead of MPI_INT for >>>>>>> example, it dies in F90Array1dAccess() with 'unsupported MPI_Datatype'. >>>>>>> Could the Fortran MPI types be supported in these routines just by >>>>>>> adding them as alternatives into the conditionals? >>>>>> Hmm, Jed will need to provide wisdom the Linux manual page for >>>>>> MPI_INTEGER clearly states: >>>>>> >>>>>> Note that the Fortran types should only be used in Fortran programs, and >>>>>> the C types should only be used in C programs. For example, it is in >>>>>> error to use MPI_INT for a Fortran INTEGER. Datatypes are of type >>>>>> MPI_Datatype in C and of type INTEGER in Fortran. >>>>>> >>>>>> If this is true then there is no place we can do the change properly. >>>>> >>>>> Yes, I first thought that MPI_Type_f2c() would convert Fortran MPI >>>>> datatypes to the C ones (e.g. turn MPI_INTEGER into MPI_INT), so that the >>>>> C side of the interface wouldn't have to worry about the Fortran MPI >>>>> datatypes, but it doesn't really seem to do that. >>>> >>>> Do did I. Its existence seems to contradict the statement in the Linux >>>> manual page. Well wait for Jed. >>> >>> A fortran INTEGER may have a different width to a C int. Hence the >>> distinction. The MPI_XXX_f2c functions convert handles on the fortran side >>> to handles on the C side (MPI_XXX_c2f does the opposite). Perhaps the >>> standard sheds some light: >>> >>> Moving handles from Fortran to C >>> >>> http://mpi-forum.org/docs/mpi-3.1/mpi31-report/node446.htm#Node446 >> >> Thanks, Lawrence. And my recollection is that the C > > Fortran types? Within C code?
The C macros for Fortran types.
