NAME¶

MPI_Type_get_extent - Returns the lower bound and extent of a data type.

SYNTAX¶

C Syntax¶

#include <mpi.h>
int MPI_Type_get_extent(MPI_Datatype  datatype, MPI_Aint *lb, 
	MPI_Aint * extent)

Fortran Syntax (see FORTRAN 77 NOTES)¶

INCLUDE 'mpif.h'
MPI_TYPE_GET_EXTENT( DATATYPE, LB, EXTENT, IERROR)
	INTEGER	 DATATYPE, IERROR 
	INTEGER(KIND=MPI_ADDRESS_KIND)  LB, EXTENT

C++ Syntax¶

#include <mpi.h>
void MPI::Datatype::Get_extent(MPI::Aint&  lb, MPI::Aint& extent) 
	const

INPUT PARAMETER¶

datatype

Data type (handle).

OUTPUT PARAMETERS¶

lb

Lower bound of data type (integer).

extent

Data type extent (integer).

IERROR

Fortran only: Error status (integer).

DESCRIPTION¶

MPI_Type_get_extent returns the lower bound and the extent of datatype.

NOTE¶

Use of MPI_Type_get_extent is strongly recommended over the old MPI-1 functions MPI_Type_extent and MPI_Type_lb.

FORTRAN 77 NOTES¶

The MPI standard prescribes portable Fortran syntax for the LB and EXTENT arguments only for Fortran 90. FORTRAN 77 users may use the non-portable syntax

     INTEGER*MPI_ADDRESS_KIND  LB
or
     INTEGER*MPI_ADDRESS_KIND  EXTENT

where MPI_ADDRESS_KIND is a constant defined in mpif.h and gives the length of the declared integer in bytes.

ERRORS¶

Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ functions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to throw an MPI:Exception object. Before the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.