/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
*
* (C) 2001 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
#include "mpiimpl.h"
/* -- Begin Profiling Symbol Block for routine MPI_Graph_neighbors */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Graph_neighbors = PMPI_Graph_neighbors
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Graph_neighbors MPI_Graph_neighbors
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Graph_neighbors as PMPI_Graph_neighbors
#elif defined(HAVE_WEAK_ATTRIBUTE)
int MPI_Graph_neighbors(MPI_Comm comm, int rank, int maxneighbors, int neighbors[])
__attribute__ ((weak, alias("PMPI_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_Graph_neighbors
#define MPI_Graph_neighbors PMPI_Graph_neighbors
/* any non-MPI functions go here, especially non-static ones */
#undef FUNCNAME
#define FUNCNAME MPIR_Graph_neighbors_impl
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
int MPIR_Graph_neighbors_impl(MPIR_Comm * comm_ptr, int rank, int maxneighbors, int neighbors[])
{
int mpi_errno = MPI_SUCCESS;
MPIR_Topology *graph_ptr;
int i, is, ie;
graph_ptr = MPIR_Topology_get(comm_ptr);
MPIR_ERR_CHKANDJUMP((!graph_ptr ||
graph_ptr->kind != MPI_GRAPH), mpi_errno, MPI_ERR_TOPOLOGY,
"**notgraphtopo");
MPIR_ERR_CHKANDJUMP2((rank < 0 ||
rank >= graph_ptr->topo.graph.nnodes), mpi_errno, MPI_ERR_RANK, "**rank",
"**rank %d %d", rank, graph_ptr->topo.graph.nnodes);
/* Get location in edges array of the neighbors of the specified rank */
if (rank == 0)
is = 0;
else
is = graph_ptr->topo.graph.index[rank - 1];
ie = graph_ptr->topo.graph.index[rank];
/* Get neighbors */
for (i = is; i < ie; i++)
*neighbors++ = graph_ptr->topo.graph.edges[i];
fn_exit:
return mpi_errno;
fn_fail:
goto fn_exit;
}
#endif
#undef FUNCNAME
#define FUNCNAME MPI_Graph_neighbors
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
/*@
MPI_Graph_neighbors - Returns the neighbors of a node associated
with a graph topology
Input Parameters:
+ comm - communicator with graph topology (handle)
. rank - rank of process in group of comm (integer)
- maxneighbors - size of array neighbors (integer)
Output Parameters:
. neighbors - ranks of processes that are neighbors to specified process
(array of integer)
.N SignalSafe
.N Fortran
.N Errors
.N MPI_SUCCESS
.N MPI_ERR_TOPOLOGY
.N MPI_ERR_COMM
.N MPI_ERR_ARG
.N MPI_ERR_RANK
@*/
int MPI_Graph_neighbors(MPI_Comm comm, int rank, int maxneighbors, int neighbors[])
{
int mpi_errno = MPI_SUCCESS;
MPIR_Comm *comm_ptr = NULL;
MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_GRAPH_NEIGHBORS);
MPIR_ERRTEST_INITIALIZED_ORDIE();
MPIR_FUNC_TERSE_ENTER(MPID_STATE_MPI_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 and objects (post conversion) */
#ifdef HAVE_ERROR_CHECKING
{
MPID_BEGIN_ERROR_CHECKS;
{
/* Validate comm_ptr */
MPIR_Comm_valid_ptr(comm_ptr, mpi_errno, FALSE);
if (mpi_errno)
goto fn_fail;
/* If comm_ptr is not valid, it will be reset to null */
MPIR_ERRTEST_ARGNULL(neighbors, "neighbors", mpi_errno);
}
MPID_END_ERROR_CHECKS;
}
#endif /* HAVE_ERROR_CHECKING */
/* ... body of routine ... */
mpi_errno = MPIR_Graph_neighbors_impl(comm_ptr, rank, maxneighbors, neighbors);
if (mpi_errno)
MPIR_ERR_POP(mpi_errno);
/* ... end of body of routine ... */
fn_exit:
MPIR_FUNC_TERSE_EXIT(MPID_STATE_MPI_GRAPH_NEIGHBORS);
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_graph_neighbors", "**mpi_graph_neighbors %C %d %d %p", comm,
rank, maxneighbors, neighbors);
}
#endif
mpi_errno = MPIR_Err_return_comm(comm_ptr, FCNAME, mpi_errno);
goto fn_exit;
/* --END ERROR HANDLING-- */
}