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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
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/*
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*
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* (C) 2001 by Argonne National Laboratory.
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* See COPYRIGHT in top-level directory.
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*/
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#include "mpiimpl.h"
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/* -- Begin Profiling Symbol Block for routine MPI_Graph_neighbors_count */
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#if defined(HAVE_PRAGMA_WEAK)
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#pragma weak MPI_Graph_neighbors_count = PMPI_Graph_neighbors_count
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#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
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#pragma _HP_SECONDARY_DEF PMPI_Graph_neighbors_count MPI_Graph_neighbors_count
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#elif defined(HAVE_PRAGMA_CRI_DUP)
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#pragma _CRI duplicate MPI_Graph_neighbors_count as PMPI_Graph_neighbors_count
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#elif defined(HAVE_WEAK_ATTRIBUTE)
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int MPI_Graph_neighbors_count(MPI_Comm comm, int rank, int *nneighbors)
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__attribute__ ((weak, alias("PMPI_Graph_neighbors_count")));
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#endif
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/* -- End Profiling Symbol Block */
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/* Define MPICH_MPI_FROM_PMPI if weak symbols are not supported to build
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the MPI routines */
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#ifndef MPICH_MPI_FROM_PMPI
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#undef MPI_Graph_neighbors_count
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#define MPI_Graph_neighbors_count PMPI_Graph_neighbors_count
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#undef FUNCNAME
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#define FUNCNAME MPIR_Graph_neighbors_count_impl
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#undef FCNAME
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#define FCNAME MPL_QUOTE(FUNCNAME)
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int MPIR_Graph_neighbors_count_impl(MPIR_Comm * comm_ptr, int rank, int *nneighbors)
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{
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int mpi_errno = MPI_SUCCESS;
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MPIR_Topology *graph_ptr;
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graph_ptr = MPIR_Topology_get(comm_ptr);
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MPIR_ERR_CHKANDJUMP((!graph_ptr ||
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graph_ptr->kind != MPI_GRAPH), mpi_errno, MPI_ERR_TOPOLOGY,
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"**notgraphtopo");
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MPIR_ERR_CHKANDJUMP2((rank < 0 ||
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rank >= graph_ptr->topo.graph.nnodes), mpi_errno, MPI_ERR_RANK, "**rank",
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"**rank %d %d", rank, graph_ptr->topo.graph.nnodes);
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if (rank == 0)
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*nneighbors = graph_ptr->topo.graph.index[rank];
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else
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*nneighbors = graph_ptr->topo.graph.index[rank] - graph_ptr->topo.graph.index[rank - 1];
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fn_exit:
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return mpi_errno;
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fn_fail:
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goto fn_exit;
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}
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#endif
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#undef FUNCNAME
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#define FUNCNAME MPI_Graph_neighbors_count
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#undef FCNAME
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#define FCNAME MPL_QUOTE(FUNCNAME)
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/*@
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MPI_Graph_neighbors_count - Returns the number of neighbors of a node
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associated with a graph topology
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Input Parameters:
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+ comm - communicator with graph topology (handle)
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- rank - rank of process in group of 'comm' (integer)
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Output Parameters:
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. nneighbors - number of neighbors of specified process (integer)
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.N SignalSafe
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.N Fortran
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.N Errors
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.N MPI_SUCCESS
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.N MPI_ERR_TOPOLOGY
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.N MPI_ERR_COMM
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.N MPI_ERR_ARG
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.N MPI_ERR_RANK
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@*/
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int MPI_Graph_neighbors_count(MPI_Comm comm, int rank, int *nneighbors)
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{
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int mpi_errno = MPI_SUCCESS;
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MPIR_Comm *comm_ptr = NULL;
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MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_GRAPH_NEIGHBORS_COUNT);
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MPIR_ERRTEST_INITIALIZED_ORDIE();
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/* Note that this routine does not require a CS_ENTER/EXIT */
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MPIR_FUNC_TERSE_ENTER(MPID_STATE_MPI_GRAPH_NEIGHBORS_COUNT);
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/* Validate parameters, especially handles needing to be converted */
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#ifdef HAVE_ERROR_CHECKING
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{
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MPID_BEGIN_ERROR_CHECKS;
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{
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MPIR_ERRTEST_COMM(comm, mpi_errno);
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}
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MPID_END_ERROR_CHECKS;
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}
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#endif
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/* Convert MPI object handles to object pointers */
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MPIR_Comm_get_ptr(comm, comm_ptr);
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/* Validate parameters and objects (post conversion) */
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#ifdef HAVE_ERROR_CHECKING
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{
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MPID_BEGIN_ERROR_CHECKS;
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{
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/* Validate comm_ptr */
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MPIR_Comm_valid_ptr(comm_ptr, mpi_errno, TRUE);
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if (mpi_errno)
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goto fn_fail;
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MPIR_ERRTEST_ARGNULL(nneighbors, "nneighbors", mpi_errno);
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/* If comm_ptr is not value, it will be reset to null */
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}
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MPID_END_ERROR_CHECKS;
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}
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#endif /* HAVE_ERROR_CHECKING */
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/* ... body of routine ... */
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mpi_errno = MPIR_Graph_neighbors_count_impl(comm_ptr, rank, nneighbors);
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if (mpi_errno)
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MPIR_ERR_POP(mpi_errno);
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/* ... end of body of routine ... */
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fn_exit:
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MPIR_FUNC_TERSE_EXIT(MPID_STATE_MPI_GRAPH_NEIGHBORS_COUNT);
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return mpi_errno;
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fn_fail:
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/* --BEGIN ERROR HANDLING-- */
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#ifdef HAVE_ERROR_CHECKING
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{
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mpi_errno =
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MPIR_Err_create_code(mpi_errno, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, MPI_ERR_OTHER,
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"**mpi_graph_neighbors_count",
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"**mpi_graph_neighbors_count %C %d %p", comm, rank, nneighbors);
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}
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#endif
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mpi_errno = MPIR_Err_return_comm(comm_ptr, FCNAME, mpi_errno);
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goto fn_exit;
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/* --END ERROR HANDLING-- */
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}
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