PetscMPIFortranDatatypeToC#

Converts a MPI_Fint that contains a Fortran MPI_Datatype to its C MPI_Datatype equivalent

Synopsis#

PetscErrorCode PetscMPIFortranDatatypeToC(MPI_Fint unit, MPI_Datatype *dtype)

Not Collective, No Fortran Support

Input Parameter#

  • unit - The Fortran MPI_Datatype

Output Parameter#

  • dtype - the corresponding C MPI_Datatype

Developer Note#

The MPI documentation in multiple places says that one can never us Fortran MPI_Datatypes in C (or vice-versa) but this is problematic since users could never call C routines from Fortran that have MPI_Datatype arguments. Jed states that the Fortran MPI_Datatypes will always be available in C if the MPI was built to support Fortran. This function relies on this.

Level#

developer

Location#

src/sys/f90-src/f90_cwrap.c


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