Create an attribute keyval for MPI window objects
int MPI_Win_create_keyval(MPI_Win_copy_attr_function *win_copy_attr_fn,
int *win_keyval, void *extra_state)
- copy callback function for win_keyval (function)
- delete callback function for win_keyval (function)
- extra state for callback functions
- key value for future access (integer)
Default copy and delete functions are available. These are
- empty copy function
- empty delete function
- simple dup function
Return value from attribute callbacks
The MPI-2 versions of the attribute callbacks should return either
MPI_SUCCESS on success or a valid MPI error code or class on failure.
The MPI standard is ambiguous on this point, but as MPI-2 provides
the routines MPI_Add_error_class and MPI_Add_error_code that allow the
user to define and use MPI error codes and classes.
Thread and Interrupt Safety
This routine is thread-safe. This means that this routine may be
safely used by multiple threads without the need for any user-provided
thread locks. However, the routine is not interrupt safe. Typically,
this is due to the use of memory allocation routines such as malloc
or other non-MPICH runtime routines that are themselves not interrupt-safe.
Notes for Fortran
All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK) have
an additional argument ierr at the end of the argument list. ierr
is an integer and has the same meaning as the return value of the routine
in C. In Fortran, MPI routines are subroutines, and are invoked with the
All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGER
All MPI routines (except MPI_Wtime and MPI_Wtick) return an error value;
C routines as the value of the function and Fortran routines in the last
argument. Before the value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job. The error handler
may be changed with MPI_Comm_set_errhandler (for communicators),
MPI_File_set_errhandler (for files), and MPI_Win_set_errhandler (for
RMA windows). The MPI-1 routine MPI_Errhandler_set may be used but
its use is deprecated. The predefined error handler
MPI_ERRORS_RETURN may be used to cause error values to be returned.
Note that MPI does not guarentee that an MPI program can continue past
an error; however, MPI implementations will attempt to continue whenever
- No error; MPI routine completed successfully.
- Invalid argument. Some argument is invalid and is not
identified by a specific error class (e.g., MPI_ERR_RANK).
- Other error; use MPI_Error_string to get more information
about this error code.