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/*
* Copyright (c) 2004-2007 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) 2004-2008 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 (c) 2007-2008 Cisco Systems, Inc. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include <stdio.h>
#include "ompi/mpi/c/bindings.h"
#include "ompi/runtime/params.h"
#include "ompi/communicator/communicator.h"
#include "ompi/errhandler/errhandler.h"
#include "ompi/mca/topo/base/base.h"
#include "ompi/memchecker.h"
#if OPAL_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Graph_create = PMPI_Graph_create
#endif
#if OMPI_PROFILING_DEFINES
#include "ompi/mpi/c/profile/defines.h"
#endif
static const char FUNC_NAME[] = "MPI_Graph_create";
int MPI_Graph_create(MPI_Comm old_comm, int nnodes, int *index,
int *edges, int reorder, MPI_Comm *comm_graph)
{
int err;
bool re_order = false;
MEMCHECKER(
memchecker_comm(old_comm);
);
/* check the arguments */
if (MPI_PARAM_CHECK) {
OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
if (ompi_comm_invalid(old_comm)) {
return OMPI_ERRHANDLER_INVOKE (MPI_COMM_WORLD, MPI_ERR_COMM,
FUNC_NAME);
}
if (OMPI_COMM_IS_INTER(old_comm)) {
return OMPI_ERRHANDLER_INVOKE (old_comm, MPI_ERR_COMM,
FUNC_NAME);
}
if (nnodes < 0) {
return OMPI_ERRHANDLER_INVOKE (old_comm, MPI_ERR_ARG,
FUNC_NAME);
} else if (nnodes >= 1 && ((NULL == index) || (NULL == edges))) {
return OMPI_ERRHANDLER_INVOKE (old_comm, MPI_ERR_ARG,
FUNC_NAME);
}
if (nnodes > ompi_comm_size(old_comm)) {
return OMPI_ERRHANDLER_INVOKE (old_comm, MPI_ERR_ARG,
FUNC_NAME);
}
}
/* MPI-2.1 7.5.3 states that if nnodes == 0, all processes should
get MPI_COMM_NULL */
if (0 == nnodes) {
*comm_graph = MPI_COMM_NULL;
return MPI_SUCCESS;
}
/*
* Now we have to check if the topo module exists or not. This has been
* removed from initialization since most of the MPI calls do not use
* this module
*/
if (!(mca_topo_base_components_opened_valid ||
mca_topo_base_components_available_valid)) {
if (OMPI_SUCCESS != (err = mca_topo_base_open())) {
return OMPI_ERRHANDLER_INVOKE(old_comm, err, FUNC_NAME);
}
if (OMPI_SUCCESS !=
(err = mca_topo_base_find_available(OPAL_ENABLE_PROGRESS_THREADS,
OMPI_ENABLE_THREAD_MULTIPLE))) {
return OMPI_ERRHANDLER_INVOKE(old_comm, err, FUNC_NAME);
}
}
OPAL_CR_ENTER_LIBRARY();
/*
* everything seems to be alright with the communicator, we can go
* ahead and select a topology module for this purpose and create
* the new graph communicator
*/
re_order = (0 == reorder) ? false : true;
err = ompi_topo_create ((struct ompi_communicator_t *)old_comm,
nnodes,
index,
edges,
re_order,
(struct ompi_communicator_t **)comm_graph,
OMPI_COMM_GRAPH);
OPAL_CR_EXIT_LIBRARY();
/* check the error status */
if (MPI_SUCCESS != err) {
return OMPI_ERRHANDLER_INVOKE(old_comm, err, FUNC_NAME);
}
/* All done */
return MPI_SUCCESS;
}
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