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MPI_Win_create_keyval

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.