17.2.384. MPI_Type_create_hindexed_block

MPI_Type_create_indexed_block, MPI_Type_create_hindexed_block - Creates an indexed data type with the same block length for all blocks.

17.2.384.1. SYNTAX

17.2.384.1.1. C Syntax

#include <mpi.h>

int MPI_Type_create_indexed_block(int count, int blocklength, const int array_of_displacements[], MPI_Datatype oldtype, MPI_Datatype *newtype)

int MPI_Type_create_hindexed_block(int count, int blocklength, const MPI_Aint array_of_displacements[], MPI_Datatype oldtype, MPI_Datatype *newtype)

17.2.384.1.2. Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_TYPE_CREATE_INDEXED_BLOCK(COUNT, BLOCKLENGTH,
             ARRAY_OF_DISPLACEMENTS, OLDTYPE, NEWTYPE, IERROR)
     INTEGER COUNT, BLOCKLENGTH, ARRAY_OF_DISPLACEMENTS(*),
             OLDTYPE, NEWTYPE, IERROR

MPI_TYPE_CREATE_HINDEXED_BLOCK(COUNT, BLOCKLENGTH,
             ARRAY_OF_DISPLACEMENTS, OLDTYPE, NEWTYPE, IERROR)
     INTEGER COUNT, BLOCKLENGTH, OLDTYPE, NEWTYPE
     INTEGER(KIND=MPI_ADDRESS_KIND) ARRAY_OF_DISPLACEMENTS(*)
     INTEGER IERROR

17.2.384.1.3. Fortran 2008 Syntax

USE mpi_f08
MPI_Type_create_indexed_block(count, blocklength, array_of_displacements,
             oldtype, newtype, ierror)
     INTEGER, INTENT(IN) :: count, blocklength,
     array_of_displacements(count)
     TYPE(MPI_Datatype), INTENT(IN) :: oldtype
     TYPE(MPI_Datatype), INTENT(OUT) :: newtype
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror

MPI_Type_create_hindexed_block(count, blocklength, array_of_displacements,
             oldtype, newtype, ierror)
     INTEGER, INTENT(IN) :: count, blocklength
     INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(IN) ::
     array_of_displacements(count)
     TYPE(MPI_Datatype), INTENT(IN) :: oldtype
     TYPE(MPI_Datatype), INTENT(OUT) :: newtype
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror

17.2.384.2. INPUT PARAMETERS

  • count: Length of array of displacements (integer).

  • blocklength: Size of block (integer).

  • array_of_displacements: Array of displacements (array of integers). In units of the extent of oldtype for MPI_Type_create_indexed_block and bytes for MPI_Type_create_hindexed_block.

  • oldtype: Old data type (handle).

17.2.384.3. OUTPUT PARAMETERS

  • newtype: New data type (handle).

  • IERROR: Fortran only: Error status (integer).

17.2.384.4. DESCRIPTION

MPI_Type_create_indexed_block and MPI_Type_create_hindexed_block create an indexed data type with the same block length for all blocks. The only difference between the two functions is MPI_Type_create_indexed_block takes an array of displacements in units of the extent of oldtype while MPI_Type_create_hindexed_block takes displacements in bytes.

17.2.384.5. ERRORS

Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument.

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.

See also

MPI_Type_indexed