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MPI_Win_create_keyval.3.rst

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MPI_Win_create_keyval

:ref:`MPI_Win_create_keyval` |mdash| Creates a keyval for a window.

SYNTAX

C Syntax

#include <mpi.h>

int MPI_Win_create_keyval(MPI_Win_copy_attr_function *win_copy_attr_fn,
     MPI_Win_delete_attr_function *win_delete_attr_fn,
     int *win_keyval, void *extra_state)

Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_WIN_CREATE_KEYVAL(WIN_COPY_ATTR_FN, WIN_DELETE_ATTR_FN,
     WIN_KEYVAL, EXTRA_STATE, IERROR)
     EXTERNAL WIN_COPY_ATTR_FN, WIN_DELETE_ATTR_FN
     INTEGER WIN_KEYVAL, IERROR
     INTEGER(KIND=MPI_ADDRESS_KIND) EXTRA_STATE

Fortran 2008 Syntax

USE mpi_f08
MPI_Win_create_keyval(win_copy_attr_fn, win_delete_attr_fn, win_keyval,
             extra_state, ierror)
     PROCEDURE(MPI_Win_copy_attr_function) :: win_copy_attr_fn
     PROCEDURE(MPI_Win_delete_attr_function) :: win_delete_attr_fn
     INTEGER, INTENT(OUT) :: win_keyval
     INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(IN) :: extra_state
     INTEGER, OPTIONAL, INTENT(OUT) :: ierror

INPUT PARAMETERS

  • win_copy_attr_fn: Copy callback function for win_keyval (function).
  • win_delete_attr_fn: Delete callback function for win_keyval (function).
  • extra_state: Extra state for callback functions.

OUTPUT PARAMETERS

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

DESCRIPTION

The argument win_copy_attr_fn may be specified as MPI_WIN_NULL_COPY_FN or MPI_WIN_DUP_FN from either C or Fortran. MPI_WIN_NULL_COPY_FN is a function that serves only to return flag = 0 and MPI_SUCCESS. MPI_WIN_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 win_delete_attr_fn may be specified as MPI_WIN_NULL_DELETE_FN from either C or Fortran. MPI_WIN_NULL_DELETE_FN is a function that serves only to return MPI_SUCCESS.

The C callback functions are:

typedef int MPI_Win_copy_attr_function(MPI_Win oldwin, int win_keyval,
             void *extra_state, void *attribute_val_in,
             void *attribute_val_out, int *flag);

typedef int MPI_Win_delete_attr_function(MPI_Win win, int win_keyval,
             void *attribute_val, void *extra_state);

The Fortran callback functions are:

SUBROUTINE WIN_COPY_ATTR_FN(OLDWIN, WIN_KEYVAL, EXTRA_STATE,
     ATTRIBUTE_VAL_IN, ATTRIBUTE_VAL_OUT, FLAG, IERROR)
     INTEGER OLDWIN, WIN_KEYVAL, IERROR
     INTEGER(KIND=MPI_ADDRESS_KIND) EXTRA_STATE, ATTRIBUTE_VAL_IN,
             ATTRIBUTE_VAL_OUT
     LOGICAL FLAG

SUBROUTINE WIN_DELETE_ATTR_FN(WIN, WIN_KEYVAL, ATTRIBUTE_VAL,
     EXTRA_STATE, IERROR)
     INTEGER WIN, WIN_KEYVAL, IERROR
     INTEGER(KIND=MPI_ADDRESS_KIND) ATTRIBUTE_VAL, EXTRA_STATE

ERRORS