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MPI_Type_create_keyval.3.rst

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MPI_Type_create_keyval

:ref:`MPI_Type_create_keyval` |mdash| Generates a new attribute key for caching on data types.

SYNTAX

C Syntax

#include <mpi.h>

int MPI_Type_create_keyval(MPI_Type_copy_attr_function *type_copy_attr_fn,
     MPI_Type_delete_attr_function *type_delete_attr_fn,
     int *type_keyval, void *extra_state)

Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_TYPE_CREATE_KEYVAL(TYPE_COPY_ATTR_FN, TYPE_DELETE_ATTR_FN,
             TYPE_KEYVAL, EXTRA_STATE, IERROR)
     EXTERNAL TYPE_COPY_ATTR_FN, TYPE_DELETE_ATTR_FN
     INTEGER TYPE_KEYVAL, IERROR
     INTEGER(KIND=MPI_ADDRESS_KIND) EXTRA_STATE

Fortran 2008 Syntax

USE mpi_f08
MPI_Type_create_keyval(type_copy_attr_fn, type_delete_attr_fn, type_keyval,
             extra_state, ierror)
     PROCEDURE(MPI_Type_copy_attr_function) :: type_copy_attr_fn
     PROCEDURE(MPI_Type_delete_attr_function) :: type_delete_attr_fn
     INTEGER, INTENT(OUT) :: type_keyval
     INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(IN) :: extra_state
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror

INPUT PARAMETERS

  • type_copy_attr_fn: Copy callback function for type_keyval (function).
  • type_delete_attr_fn: Delete callback function for type_keyval (function).
  • extra_state: Extra state for callback functions.

OUTPUT PARAMETERS

  • type_keyval: Key value for future access (integer).
  • ierror: Fortran only: Error status (integer).

DESCRIPTION

:ref:`MPI_Type_create_keyval` generates a new attribute key for caching on data types. This routine partially replaces :ref:`MPI_Keyval_create`.

The argument type_copy_attr_fn may be specified as MPI_TYPE_NULL_COPY_FN or MPI_TYPE_DUP_FN from C or Fortran. MPI_TYPE_NULL_COPY_FN is a function that does nothing other than returning flag = 0 and MPI_SUCCESS. MPI_TYPE_DUP_FN is a simple-minded copy function that sets flag = 1, returns the value of attribute_val_in in attribute_val_out, and returns MPI_SUCCESS.

The argument type_delete_attr_fn may be specified as MPI_TYPE_NULL_DELETE_FN from C or Fortran. MPI_TYPE_NULL_DELETE_FN is a function that does nothing beyond returning MPI_SUCCESS. The C callback functions are:

typedef int MPI_Type_copy_attr_function(MPI_Datatype oldtype,
            int type_keyval, void *extra_state, void *attribute_val_in,
            void *attribute_val_out, int *flag);

typedef int MPI_Type_delete_attr_function(MPI_Datatype type, int type_keyval,
             void *attribute_val, void *extra_state);

The Fortran callback functions are:

SUBROUTINE TYPE_COPY_ATTR_FN(OLDTYPE, TYPE_KEYVAL, EXTRA_STATE,
             ATTRIBUTE_VAL_IN, ATTRIBUTE_VAL_OUT, FLAG, IERROR)
    INTEGER OLDTYPE, TYPE KEYVAL, IERROR
    INTEGER(KIND=MPI_ADDRESS_KIND) EXTRA_STATE,
        ATTRIBUTE_VAL_IN, ATTRIBUTE_VAL_OUT
    LOGICAL FLAG

SUBROUTINE TYPE_DELETE_ATTR_FN(TYPE, TYPE_KEYVAL, ATTRIBUTE_VAL, EXTRA_STATE,
             IERROR)
    INTEGER TYPE, TYPE_KEYVAL, IERROR
    INTEGER(KIND=MPI_ADDRESS_KIND) ATTRIBUTE VAL, EXTRA_STATE

ERRORS

.. seealso::
   * :ref:`MPI_Type_free_keyval`