MPI_Datarep_extent_function callback function

This function is a placeholder for user-defined extent callback functions.

Syntax

int MPI_Datarep_extent_function(
        MPI_Datatype datatype,
  _Out_ MPI_Aint     *file_extent,
  _In_  void         *extra_state
);

Parameters

• datatype
  Datatype.

• file_extent [out]
  The number of bytes required to store datatype in the file representation.

• extra_state [in]
  The same argument that was passed to the MPI_Register_datarep call.

Return value

The extent callback functions return an error code.

Fortran

    SUBROUTINE DATAREP_EXTENT_FUNCTION(DATATYPE, EXTENT, EXTRA_STATE, IERROR)
        INTEGER DATATYPE, IERROR
        INTEGER(KIND=MPI_ADDRESS_KIND) EXTENT, EXTRA_STATE

Remarks

MPI will only call this routine with predefined datatypes employed by the user.

Requirements

Product	HPC Pack 2012 MS-MPI Redistributable Package, HPC Pack 2008 R2 MS-MPI Redistributable Package, HPC Pack 2008 MS-MPI Redistributable Package or HPC Pack 2008 Client Utilities
Header	Mpi.h; Mpif.h

See also

MPI Miscellaneous Functions

MPI_Register_datarep