openmpi/ompi/mca/coll/self/coll_self_allreduce.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/datatype.h"
#include "coll_self.h"


/*
 *	allreduce_intra
 *
 *	Function:	- allreduce
 *	Accepts:	- same as MPI_Allreduce()
 *	Returns:	- MPI_SUCCESS or error code
 */
int mca_coll_self_allreduce_intra(void *sbuf, void *rbuf, int count,
                                  struct ompi_datatype_t *dtype, 
                                  struct ompi_op_t *op,
                                  struct ompi_communicator_t *comm)
{
    if (MPI_IN_PLACE == sbuf) {
        return MPI_SUCCESS;
    } else {
        return ompi_ddt_copy_content_same_ddt(dtype, count, (char*)rbuf, (char*)sbuf);
    }
}