MPI_File_get_type_extent - Returns the extent of datatype
in the file
SYNOPSIS
C:
#include "mpi.h"
int MPI_File_get_type_extent(MPI_File fh, MPI_Datatype
datatype, MPI_Aint *extent)
Fortran:
INCLUDE "mpif.h" (or USE MPI)
INTEGER fh, datatype, ierror
INTEGER(KIND=MPI_ADDRESS_KIND) extent
CALL MPI_FILE_GET_TYPE_EXTENT(fh, datatype, extent,
ierror)
DESCRIPTION
The MPI_File_get_type_extent routine returns the extent of
datatype in the fh file. This extent will be the same for
all processes accessing the fh file. If the current view
uses a user-defined data representation, MPI uses the
dtype_file_extent_fn callback to calculate the extent.
In the case of user-defined data representations, the
extent of a derived datatype can be calculated by first
using dtype_file_extent_fn to determine the extents of the
predefined datatypes in this derived datatype.
The MPI_File_get_type_extent routine accepts the following
arguments:
fh Specifies the file handle (handle)
datatype Specifies the datatype (handle)
extent Returns the extent of the datatype
(nonnegative integer)
ierror Specifies the return code value for
successful completion, which is in
MPI_SUCCESS. MPI_SUCCESS is defined in the
mpif.h file.
Notes for Fortran
All MPI objects (for example, MPI_Datatype, MPI_Comm,
MPI_File) are of type INTEGER.
MPI_File_open(3), MPI_IO(3)
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