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MPI_Request_c2f(3) man page (version 1.3.4)

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       MPI_Comm_f2c,  MPI_Comm_c2f,  MPI_File_f2c, MPI_File_c2f, MPI_Info_f2c,
       MPI_Info_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.


C Syntax

       #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_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 trans-
       lation  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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