petsc-3.13.6 2020-09-29
Converts
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
Input Parameter
unit -The Fortran MPI_Datatype
Output Parameter
dtype -the corresponding C MPI_Datatype
Developer Notes
The MPI documentation in multiple places says that one can never us
Fortran MPI_Datatypes in C (or vis-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
relys on this.
Level
developer
Location
src/sys/f90-src/f90_cwrap.c
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages