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

/*
 * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2005 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 "coll_self.h"
#include "ompi/datatype/datatype.h"


/*
 *	scatterv_intra
 *
 *	Function:	- scatterv
 *	Accepts:	- same arguments as MPI_Scatter()
 *	Returns:	- MPI_SUCCESS or error code
 */
int mca_coll_self_scatterv_intra(void *sbuf, int *scounts,
                                 int *disps, struct ompi_datatype_t *sdtype,
                                 void *rbuf, int rcount,
                                 struct ompi_datatype_t *rdtype, int root,
                                 struct ompi_communicator_t *comm,
                                 mca_coll_base_module_t *module)
{
    if (MPI_IN_PLACE == rbuf) {
        return MPI_SUCCESS;
    } else {
        int err;        
        ptrdiff_t lb, extent;
        err = ompi_ddt_get_extent(sdtype, &lb, &extent);
        if (OMPI_SUCCESS != err) {
            return OMPI_ERROR;
        }
        return ompi_ddt_sndrcv(((char *) sbuf) + disps[0]*extent, scounts[0], 
                               sdtype, rbuf, rcount, rdtype);
    }
}