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Table of Contents
MPI_Comm_f2c, MPI_Comm_c2f, MPI_File_f2c, MPI_File_c2f, MPI_Info_f2c,
MPI_Info_c2f, MPI_Message_f2c, MPI_Message_c2f, MPI_Op_f2c, MPI_Op_c2f,
MPI_Request_f2c, MPI_Request_c2f, MPI_Type_f2c, MPI_Type_c2f, MPI_Win_f2c,
MPI_Win_c2f - Translates a C handle into a Fortran handle, or vice versa.
#include <mpi.h>
MPI_Comm MPI_Comm_f2c(MPI_Fint comm)
MPI_Fint MPI_Comm_c2f(MPI_Comm comm)
MPI_File MPI_File_f2c(MPI_Fint file)
MPI_Fint MPI_File_c2f(MPI_File file)
MPI_Group MPI_Group_f2c(MPI Fint group)
MPI_Fint MPI_Group_c2f(MPI Group group)
MPI_Info MPI_Info_f2c(MPI_Fint info)
MPI_Fint MPI_Info_c2f(MPI_Info info)
MPI_Message MPI_Message_f2c(MPI_Fint message)
MPI_Fint MPI_Message_c2f(MPI_Message message)
MPI_Op MPI_Op_f2c(MPI_Fint op)
MPI_Fint MPI_Op_c2f(MPI_Op op)
MPI_Request MPI_Request_f2c(MPI_Fint request)
MPI_Fint MPI_Request_c2f(MPI_Request request)
MPI_Datatype MPI_Type_f2c(MPI_Fint datatype)
MPI_Fint MPI_Type_c2f(MPI_Datatype datatype)
MPI_Win MPI_Win_f2c(MPI_Fint win)
MPI_Fint MPI_Win_c2f(MPI_Win win)
Handles are passed between Fortran and C or C++ by using an
explicit C wrapper to convert Fortran handles to C handles. There is no
direct access to C or C++ handles in Fortran. Handles are passed between
C and C++ using overloaded C++ operators called from C++ code. There is
no direct access to C++ objects from C. The type definition MPI_Fint is
provided in C/C++ for an integer of the size that matches a Fortran INTEGER;
usually, MPI_Fint will be equivalent to int. The handle translation functions
are provided in C to convert from a Fortran handle (which is an integer)
to a C handle, and vice versa.
For example, if comm is a valid Fortran handle
to a communicator, then MPI_Comm_f2c returns a valid C handle to that same
communicator; if comm = MPI_COMM_NULL (Fortran value), then MPI_Comm_f2c
returns a null C handle; if comm is an invalid Fortran handle, then MPI_Comm_f2c
returns an invalid C handle.
This function does not return an error
value. Consequently, the result of calling it before MPI_Init or after MPI_Finalize
is undefined.
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