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MPI_Win_create_keyval(3OpenMPI)                                              MPI_Win_create_keyval(3OpenMPI)



NAME
       MPI_Win_create_keyval - 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 (see FORTRAN 77 NOTES)
       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


C++ Syntax
       #include <mpi.h>
       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)


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, 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,  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);

       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);


FORTRAN 77 NOTES
       The MPI standard prescribes portable Fortran syntax for the EXTRA_STATE argument only for Fortran 90.
       FORTRAN 77 users may use the non-portable syntax

            INTEGER*MPI_ADDRESS_KIND EXTRA_STATE

       where MPI_ADDRESS_KIND is a constant defined in mpif.h and gives 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.




Open MPI 1.2                                   September 2006                MPI_Win_create_keyval(3OpenMPI)