/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *

 *  (C) 2009 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpiimpl.h"

/* -- Begin Profiling Symbol Block for routine MPI_Dist_graph_neighbors */

#if defined(HAVE_PRAGMA_WEAK)

#pragma weak MPI_Dist_graph_neighbors = PMPI_Dist_graph_neighbors

#elif defined(HAVE_PRAGMA_HP_SEC_DEF)

#pragma _HP_SECONDARY_DEF PMPI_Dist_graph_neighbors  MPI_Dist_graph_neighbors

#elif defined(HAVE_PRAGMA_CRI_DUP)

#pragma _CRI duplicate MPI_Dist_graph_neighbors as PMPI_Dist_graph_neighbors

#elif defined(HAVE_WEAK_ATTRIBUTE)

int MPI_Dist_graph_neighbors(MPI_Comm comm, int maxindegree, int sources[], int sourceweights[],

                             int maxoutdegree, int destinations[], int destweights[])

    __attribute__ ((weak, alias("PMPI_Dist_graph_neighbors")));

#endif

/* -- End Profiling Symbol Block */

/* Define MPICH_MPI_FROM_PMPI if weak symbols are not supported to build

   the MPI routines */

#ifndef MPICH_MPI_FROM_PMPI

#undef MPI_Dist_graph_neighbors

#define MPI_Dist_graph_neighbors PMPI_Dist_graph_neighbors

/* any utility functions should go here, usually prefixed with PMPI_LOCAL to

 * correctly handle weak symbols and the profiling interface */

#undef FUNCNAME

#define FUNCNAME MPIR_Dist_graph_neighbors_impl

#undef FCNAME

#define FCNAME MPL_QUOTE(FUNCNAME)

int MPIR_Dist_graph_neighbors_impl(MPIR_Comm * comm_ptr,

                                   int maxindegree, int sources[], int sourceweights[],

                                   int maxoutdegree, int destinations[], int destweights[])

{

    int mpi_errno = MPI_SUCCESS;

    MPIR_Topology *topo_ptr = NULL;

    topo_ptr = MPIR_Topology_get(comm_ptr);

    MPIR_ERR_CHKANDJUMP(!topo_ptr ||

                        topo_ptr->kind != MPI_DIST_GRAPH, mpi_errno, MPI_ERR_TOPOLOGY,

                        "**notdistgraphtopo");

    MPIR_Memcpy(sources, topo_ptr->topo.dist_graph.in, maxindegree * sizeof(int));

    MPIR_Memcpy(destinations, topo_ptr->topo.dist_graph.out, maxoutdegree * sizeof(int));

    if (sourceweights != MPI_UNWEIGHTED && topo_ptr->topo.dist_graph.is_weighted) {

        MPIR_Memcpy(sourceweights, topo_ptr->topo.dist_graph.in_weights, maxindegree * sizeof(int));

    }

    if (destweights != MPI_UNWEIGHTED && topo_ptr->topo.dist_graph.is_weighted) {

        MPIR_Memcpy(destweights, topo_ptr->topo.dist_graph.out_weights, maxoutdegree * sizeof(int));

    }

  fn_exit:

    return mpi_errno;

  fn_fail:

    goto fn_exit;

}

#endif

#undef FUNCNAME

#define FUNCNAME MPI_Dist_graph_neighbors

#undef FCNAME

#define FCNAME MPL_QUOTE(FUNCNAME)

/*@

MPI_Dist_graph_neighbors - Provides adjacency information for a distributed graph topology.

Input Parameters:

+ comm - communicator with distributed graph topology (handle)

. maxindegree - size of sources and sourceweights arrays (non-negative integer)

- maxoutdegree - size of destinations and destweights arrays (non-negative integer)

Output Parameters:

+ sources - processes for which the calling process is a destination (array of non-negative integers)

. sourceweights - weights of the edges into the calling process (array of non-negative integers)

. destinations - processes for which the calling process is a source (array of non-negative integers)

- destweights - weights of the edges out of the calling process (array of non-negative integers)

.N ThreadSafe

.N Fortran

.N Errors

.N MPI_SUCCESS

@*/

int MPI_Dist_graph_neighbors(MPI_Comm comm,

                             int maxindegree, int sources[], int sourceweights[],

                             int maxoutdegree, int destinations[], int destweights[])

{

    int mpi_errno = MPI_SUCCESS;

    MPIR_Comm *comm_ptr = NULL;

    MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_DIST_GRAPH_NEIGHBORS);

    MPIR_ERRTEST_INITIALIZED_ORDIE();

    /* FIXME: Why does this routine need a CS */

    MPID_THREAD_CS_ENTER(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);

    MPIR_FUNC_TERSE_ENTER(MPID_STATE_MPI_DIST_GRAPH_NEIGHBORS);

    /* Validate parameters, especially handles needing to be converted */

#ifdef HAVE_ERROR_CHECKING

    {

        MPID_BEGIN_ERROR_CHECKS;

        {

            MPIR_ERRTEST_COMM(comm, mpi_errno);

        }

        MPID_END_ERROR_CHECKS;

    }

#endif

    /* Convert MPI object handles to object pointers */

    MPIR_Comm_get_ptr(comm, comm_ptr);

    /* Validate parameters */

#ifdef HAVE_ERROR_CHECKING

    {

        MPID_BEGIN_ERROR_CHECKS;

        {

            MPIR_Topology *topo_ptr = NULL;

            topo_ptr = MPIR_Topology_get(comm_ptr);

            MPIR_ERR_CHKANDJUMP(!topo_ptr ||

                                topo_ptr->kind != MPI_DIST_GRAPH, mpi_errno, MPI_ERR_TOPOLOGY,

                                "**notdistgraphtopo");

            MPIR_ERRTEST_ARGNEG(maxindegree, "maxindegree", mpi_errno);

            MPIR_ERRTEST_ARGNEG(maxoutdegree, "maxoutdegree", mpi_errno);

            MPIR_ERR_CHKANDJUMP3((maxindegree < topo_ptr->topo.dist_graph.indegree), mpi_errno,

                                 MPI_ERR_ARG, "**argtoosmall", "**argtoosmall %s %d %d",

                                 "maxindegree", maxindegree, topo_ptr->topo.dist_graph.indegree);

            MPIR_ERR_CHKANDJUMP3((maxoutdegree < topo_ptr->topo.dist_graph.outdegree), mpi_errno,

                                 MPI_ERR_ARG, "**argtoosmall", "**argtoosmall %s %d %d",

                                 "maxoutdegree", maxoutdegree, topo_ptr->topo.dist_graph.outdegree);

        }

        MPID_END_ERROR_CHECKS;

    }

#endif /* HAVE_ERROR_CHECKING */

    /* ... body of routine ...  */

    mpi_errno = MPIR_Dist_graph_neighbors_impl(comm_ptr,

                                               maxindegree, sources, sourceweights,

                                               maxoutdegree, destinations, destweights);

    if (mpi_errno)

        MPIR_ERR_POP(mpi_errno);

    /* ... end of body of routine ... */

  fn_exit:

    MPIR_FUNC_TERSE_EXIT(MPID_STATE_MPI_DIST_GRAPH_NEIGHBORS);

    MPID_THREAD_CS_EXIT(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);

    return mpi_errno;

  fn_fail:

    /* --BEGIN ERROR HANDLING-- */

#ifdef HAVE_ERROR_CHECKING

    mpi_errno =

        MPIR_Err_create_code(mpi_errno, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, MPI_ERR_OTHER,

                             "**mpi_dist_graph_neighbors",

                             "**mpi_dist_graph_neighbors %C %d %p %p %d %p %p", comm, maxindegree,

                             sources, sourceweights, maxoutdegree, destinations, destweights);

#endif

    mpi_errno = MPIR_Err_return_comm(comm_ptr, FCNAME, mpi_errno);

    goto fn_exit;

    /* --END ERROR HANDLING-- */

}