/*
 * Copyright (c) 2004-2007 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 (c) 2006      University of Houston. All rights reserved.
 * Copyright (c) 2006      Cisco Systems, Inc.  All rights reserved.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 */
#include "ompi_config.h"
#include <stdio.h>

#include "ompi/mpi/c/bindings.h"
#include "ompi/runtime/params.h"
#include "ompi/group/group.h"
#include "ompi/errhandler/errhandler.h"
#include "ompi/communicator/communicator.h"

#if OPAL_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Group_union = PMPI_Group_union
#endif

#if OMPI_PROFILING_DEFINES
#include "ompi/mpi/c/profile/defines.h"
#endif

static const char FUNC_NAME[] = "MPI_Group_union";


int MPI_Group_union(MPI_Group group1, MPI_Group group2, MPI_Group *new_group) 
{
    int err;

    /* check for errors */
    if (MPI_PARAM_CHECK) {
        OMPI_ERR_INIT_FINALIZE(FUNC_NAME);

        if ((MPI_GROUP_NULL == group1) || (MPI_GROUP_NULL == group2) ||
            (NULL == group1) || (NULL == group2) ||
            (NULL == new_group)) {
            return 
                OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_GROUP,
                                       FUNC_NAME);
        }
    }

    OPAL_CR_ENTER_LIBRARY();

    err = ompi_group_union ( group1, group2,  new_group );
    OMPI_ERRHANDLER_RETURN(err, MPI_COMM_WORLD, err, FUNC_NAME );
}