/*
 * Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2013 The University of Tennessee and The University
 *                         of Tennessee Research Foundation.  All rights
 *                         reserved.
 * Copyright (c) 2004-2008 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) 2007      Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2012-2013 Inria.  All rights reserved.
 * Copyright (c) 2015      Research Organization for Information Science
 *                         and Technology (RIST). 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/communicator/communicator.h"
#include "ompi/errhandler/errhandler.h"
#include "ompi/mca/topo/topo.h"
#include "ompi/memchecker.h"

#if OMPI_BUILD_MPI_PROFILING
#if OPAL_HAVE_WEAK_SYMBOLS
#pragma weak MPI_Graph_neighbors_count = PMPI_Graph_neighbors_count
#endif
#define MPI_Graph_neighbors_count PMPI_Graph_neighbors_count
#endif

static const char FUNC_NAME[] = "MPI_Graph_neighbors_count";


int MPI_Graph_neighbors_count(MPI_Comm comm, int rank, int *nneighbors)
{
    int err;

    MEMCHECKER(
        memchecker_comm(comm);
    );

    /* check the arguments */
    if (MPI_PARAM_CHECK) {
        OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
        if (ompi_comm_invalid(comm)) {
            return OMPI_ERRHANDLER_INVOKE (MPI_COMM_WORLD, MPI_ERR_COMM,
                                           FUNC_NAME);
        }
        if (OMPI_COMM_IS_INTER(comm)) {
            return OMPI_ERRHANDLER_INVOKE (comm, MPI_ERR_COMM,
                                           FUNC_NAME);
        }
        if ((0 > rank) || (rank > ompi_group_size(comm->c_local_group))) {
            return OMPI_ERRHANDLER_INVOKE (comm, MPI_ERR_RANK,
                                           FUNC_NAME);
        }
        if (NULL == nneighbors) {
            return OMPI_ERRHANDLER_INVOKE (comm, MPI_ERR_ARG,
                                           FUNC_NAME);
        }
    }

    if (!OMPI_COMM_IS_GRAPH(comm)) {
        return OMPI_ERRHANDLER_INVOKE (comm, MPI_ERR_TOPOLOGY,
                                       FUNC_NAME);
    }
    OPAL_CR_ENTER_LIBRARY();

    err = comm->c_topo->topo.graph.graph_neighbors_count(comm, rank, nneighbors);
    OPAL_CR_EXIT_LIBRARY();

    OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
}
