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Man Pages


Manual Reference Pages  -  MPI_TYPE_GET_EXTENT (3)

NAME

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

CONTENTS

Syntax
C Syntax
Fortran Syntax (see FORTRAN 77 NOTES)
C++ Syntax
Input Parameter
Output Parameters
Description
Note
Fortran 77 Notes
Errors

SYNTAX

C Syntax

#include <mpi.h>
int MPI_Type_get_extent(MPI_Datatype datatype, MPI_Aint *lb,
        MPI_Aint *extent)
int MPI_Type_get_extent_x(MPI_Datatype datatype, MPI_Count *lb,
        MPI_Count *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
MPI_TYPE_GET_EXTENT_X(DATATYPE, LB, EXTENT, IERROR)
        INTEGER DATATYPE, IERROR
        INTEGER(KIND=MPI_COUNT_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. For either function, if either the lb or extent parameter cannot express the value to be returned (e.g., if the parameter is too small to hold the output value), it is set to MPI_UNDEFINED.

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

MPI_Type_get_extent:

     INTEGER*MPI_ADDRESS_KIND LB
or
     INTEGER*MPI_ADDRESS_KIND EXTENT

MPI_Type_get_extent_x:

     INTEGER*MPI_COUNT_KIND LB
or
     INTEGER*MPI_COUNT_KIND EXTENT

where MPI_ADDRESS_KIND and MPI_COUNT_KIND are constants defined in mpif.h and give 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.

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1.10.2 MPI_TYPE_GET_EXTENT (3) Jan 21, 2016

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