openmpi/ompi/mca/coll/self/coll_self_reduce_scatter.c

/*
 * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2006 The University of Tennessee and The University
 *                         of Tennessee Research Foundation.  All rights
 *                         reserved.
 * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart, 
 *                         University of Stuttgart.  All rights reserved.
 * Copyright (c) 2004-2005 The Regents of the University of California.
 *                         All rights reserved.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 */

#include "ompi_config.h"

#include "ompi/constants.h"
#include "ompi/datatype/ompi_datatype.h"
#include "coll_self.h"


/*
 *	reduce_scatter
 *
 *	Function:	- reduce then scatter
 *	Accepts:	- same as MPI_Reduce_scatter()
 *	Returns:	- MPI_SUCCESS or error code
 */
int mca_coll_self_reduce_scatter_intra(void *sbuf, void *rbuf, int *rcounts,
                                       struct ompi_datatype_t *dtype,
                                       struct ompi_op_t *op,
                                       struct ompi_communicator_t *comm,
                                       mca_coll_base_module_t *module)
{
    if (MPI_IN_PLACE == sbuf) {
        return MPI_SUCCESS;
    } else {
        return ompi_datatype_copy_content_same_ddt(dtype, rcounts[0], (char*)rbuf, (char*)sbuf);
    }
}