## 8.8.2. Windows

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The new functions for caching on windows are:

MPI_WIN_CREATE_KEYVAL(win_copy_attr_fn, win_delete_attr_fn, win_keyval, extra_state)
IN win_copy_attr_fn | copy callback function for win_keyval (function)
IN win_delete_attr_fn | delete callback function for win_keyval (function)
OUT win_keyval | key value for future access (integer)
IN extra_state | extra state for callback functions

`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)
`

`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
`

`static int MPI::Win::Create_keyval(MPI::Win::Copy_attr_function* win_copy_attr_fn, MPI::Win::Delete_attr_function* win_delete_attr_fn, void* extra_state)
`

The argument win_copy_attr_fn may be specified as MPI_WIN_NULL_COPY_FN or MPI_WIN_DUP_FN from either C, C++, or Fortran. MPI_WIN_NULL_COPY_FN is a function that does nothing other than returning 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, C++, or Fortran. MPI_WIN_NULL_DELETE_FN is a function that does nothing, other than returning 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);
`

and

`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
`

and

`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
`

The C++ callbacks are:

`typedef int MPI::Win::Copy_attr_function(const MPI::Win& oldwin, int win_keyval, void* extra_state, void* attribute_val_in, void* attribute_val_out, bool& flag);
`

and

`typedef int MPI::Win::Delete_attr_function(MPI::Win& win, int win_keyval, void* attribute_val, void* extra_state);
`

MPI_WIN_FREE_KEYVAL(win_keyval)
INOUT win_keyval | key value (integer)

`int MPI_Win_free_keyval(int *win_keyval)
`

`MPI_WIN_FREE_KEYVAL(WIN_KEYVAL, IERROR)
INTEGER WIN_KEYVAL, IERROR
`

`static void MPI::Win::Free_keyval(int& win_keyval)
`

MPI_WIN_SET_ATTR(win, win_keyval, attribute_val)
INOUT win | window to which attribute will be attached (handle)
IN win_keyval | key value (integer)
IN attribute_val | attribute value

`int MPI_Win_set_attr(MPI_Win win, int win_keyval, void *attribute_val)
`

`MPI_WIN_SET_ATTR(WIN, WIN_KEYVAL, ATTRIBUTE_VAL, IERROR)
INTEGER WIN, WIN_KEYVAL, IERROR
INTEGER(KIND=MPI_ADDRESS_KIND) ATTRIBUTE_VAL
`

`void MPI::Win::Set_attr(int win_keyval, const void* attribute_val)
`

MPI_WIN_GET_ATTR(win, win_keyval, attribute_val, flag)
IN win | window to which the attribute is attached (handle)
IN win_keyval | key value (integer)
OUT attribute_val | attribute value, unless flag = false
OUT flag | false if no attribute is associated with the key (logical)

`int MPI_Win_get_attr(MPI_Win win, int win_keyval, void *attribute_val, int *flag)
`

`MPI_WIN_GET_ATTR(WIN, WIN_KEYVAL, ATTRIBUTE_VAL, FLAG, IERROR)
INTEGER WIN, WIN_KEYVAL, IERROR
INTEGER(KIND=MPI_ADDRESS_KIND) ATTRIBUTE_VAL
LOGICAL FLAG
`

`bool MPI::Win::Get_attr(const MPI::Win& win, int win_keyval, void* attribute_val) const
`

MPI_WIN_DELETE_ATTR(win, win_keyval)
INOUT win | window from which the attribute is deleted (handle)
IN win_keyval | key value (integer)

`int MPI_Win_delete_attr(MPI_Win win, int win_keyval)
`

`MPI_WIN_DELETE_ATTR(WIN, WIN_KEYVAL, IERROR)
INTEGER WIN, WIN_KEYVAL, IERROR
`

`void MPI::Win::Delete_attr(int win_keyval)
`

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