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/*
* 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/mca/topo/base/base.h"
#include "ompi/communicator/communicator.h"
#include "ompi/mca/topo/topo.h"
/*
* function - returns the neighbors of a node associated
* with a graph topology
*
* @param comm communicator with graph topology (handle)
* @param rank rank of process in group of comm (integer)
* @param maxneighbors size of array neighbors (integer)
* @param neighbors ranks of processes that are neighbors to specified process
* (array of integer)
*
* @retval MPI_SUCCESS
*/
int mca_topo_base_graph_neighbors (MPI_Comm comm,
int rank,
int maxneighbors,
int *neighbors){
int nnbrs;
int i;
int *p;
/*
* Fill the neighbours.
*/
nnbrs = comm->c_topo_comm->mtc_dims_or_index[rank];
p = comm->c_topo_comm->mtc_periods_or_edges;
if (rank > 0) {
i = comm->c_topo_comm->mtc_dims_or_index[rank - 1];
nnbrs -= i;
p += i;
}
for (i = 0; (i < maxneighbors) && (i < nnbrs); ++i, ++p) {
*neighbors++ = *p;
}
return MPI_SUCCESS;
}
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