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/*
* Copyright (c) 2001-2002 The Trustees of Indiana University.
* All rights reserved.
* Copyright (c) 1998-2001 University of Notre Dame.
* All rights reserved.
* Copyright (c) 1994-1998 The Ohio State University.
* All rights reserved.
*
* This file is part of the LAM/MPI software package. For license
* information, see the LICENSE file in the top level directory of the
* LAM/MPI source distribution.
*
* $HEADER$
*
* $Id: graphdimsget.c,v 6.5 2002/12/11 19:15:11 jsquyres Exp $
*
* Function: - get # nodes/edges in graph topology
* Accepts: - communicator
* - ptr # nodes (returned value)
* - ptr # edges (returned value)
* Returns: - MPI_SUCCESS or error code
*/
#include <blktype.h>
#include <mpi.h>
#include <mpisys.h>
/*@
MPI_Graphdims_get - Retrieves graph topology information associated with a
communicator
Input Parameters:
. comm - communicator for group with graph structure (handle)
Output Parameter:
+ pnodes - number of nodes in graph (integer)
- pedges - number of edges in graph (integer)
.N fortran
.N Errors
.N MPI_SUCCESS
.N MPI_ERR_TOPOLOGY
.N MPI_ERR_COMM
.N MPI_ERR_ARG
.N ACK
@*/
int MPI_Graphdims_get(MPI_Comm comm, int *pnodes, int *pedges)
{
lam_initerr();
lam_setfunc(BLKMPIGRAPHDIMSGET);
/*
* Check the arguments.
*/
if (comm == MPI_COMM_NULL) {
return(lam_errfunc(MPI_COMM_WORLD,
BLKMPIGRAPHDIMSGET, lam_mkerr(MPI_ERR_COMM, EINVAL)));
}
if (LAM_IS_INTER(comm)) {
return(lam_errfunc(comm,
BLKMPIGRAPHDIMSGET, lam_mkerr(MPI_ERR_COMM, EINVAL)));
}
if (!LAM_IS_GRAPH(comm)) {
return(lam_errfunc(comm, BLKMPIGRAPHDIMSGET,
lam_mkerr(MPI_ERR_TOPOLOGY, EINVAL)));
}
if ((pnodes == 0) || (pedges == 0)) {
return(lam_errfunc(comm,
BLKMPIGRAPHDIMSGET, lam_mkerr(MPI_ERR_ARG, EINVAL)));
}
*pnodes = comm->c_topo_nprocs;
*pedges = comm->c_topo_nedges;
lam_resetfunc(BLKMPIGRAPHDIMSGET);
return(MPI_SUCCESS);
}
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