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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 (c) 2007 University of Houston. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include "coll_hierarch.h"
#include "mpi.h"
#include "ompi/constants.h"
#include "ompi/communicator/communicator.h"
#include "ompi/mca/coll/coll.h"
/*
* barrier_intra
*
* Function: - barrier using hierarchical algorithm
* Accepts: - same as MPI_Barrier()
* Returns: - MPI_SUCCESS or error code
*/
int mca_coll_hierarch_barrier_intra(struct ompi_communicator_t *comm,
mca_coll_base_module_t *module)
{
struct ompi_communicator_t *llcomm=NULL;
struct ompi_communicator_t *lcomm=NULL;
mca_coll_hierarch_module_t *hierarch_module = (mca_coll_hierarch_module_t *) module;
int root=0;
int lroot, llroot;
int rank, ret=OMPI_SUCCESS;
rank = ompi_comm_rank ( comm );
lcomm = hierarch_module->hier_lcomm;
if ( mca_coll_hierarch_verbose_param ) {
printf("%s:%d: executing hierarchical barrier\n", comm->c_name, rank );
}
llcomm = mca_coll_hierarch_get_llcomm ( root, hierarch_module, &llroot, &lroot);
/*
* Barrier consists of three steps:
* - barrier on the low-level communicators
* - barrier among the local leaders
* - barrier on the low-level communicators. This step is
* necessary to avoid that any non local leaders exit too early.
*/
if ( MPI_COMM_NULL != lcomm ) {
ret = lcomm->c_coll.coll_barrier ( lcomm, lcomm->c_coll.coll_barrier_module );
if ( OMPI_SUCCESS != ret ) {
return ret;
}
}
if ( MPI_UNDEFINED != llroot ) {
ret = llcomm->c_coll.coll_barrier ( llcomm, llcomm->c_coll.coll_barrier_module );
}
if ( MPI_COMM_NULL != lcomm ) {
ret = lcomm->c_coll.coll_barrier ( lcomm, lcomm->c_coll.coll_barrier_module );
}
return ret;
}
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