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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2017 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) 2006-2012 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2006-2009 University of Houston. All rights reserved.
* Copyright (c) 2010-2012 Oak Ridge National Labs. All rights reserved.
* Copyright (c) 2012-2013 Inria. All rights reserved.
* Copyright (c) 2015 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2016 Los Alamos National Security, LLC. All rights
* reserved.
* Copyright (c) 2018-2021 Triad National Security, LLC. All rights
* reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include <string.h>
#include "ompi/mpi/c/bindings.h"
#include "ompi/runtime/params.h"
#include "ompi/errhandler/errhandler.h"
#include "ompi/communicator/communicator.h"
#include "ompi/proc/proc.h"
#include "ompi/memchecker.h"
#if OMPI_BUILD_MPI_PROFILING
#if OPAL_HAVE_WEAK_SYMBOLS
#pragma weak MPI_Intercomm_merge = PMPI_Intercomm_merge
#endif
#define MPI_Intercomm_merge PMPI_Intercomm_merge
#endif
static const char FUNC_NAME[] = "MPI_Intercomm_merge";
int MPI_Intercomm_merge(MPI_Comm intercomm, int high,
MPI_Comm *newcomm)
{
ompi_communicator_t *newcomp = MPI_COMM_NULL;
ompi_proc_t **procs=NULL;
int first, thigh = high;
int local_size, remote_size;
int total_size;
int rc=MPI_SUCCESS;
ompi_group_t *new_group_pointer;
MEMCHECKER(
memchecker_comm(intercomm);
);
if ( MPI_PARAM_CHECK ) {
OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
if (ompi_comm_invalid ( intercomm ) ||
!( intercomm->c_flags & OMPI_COMM_INTER ) )
return OMPI_ERRHANDLER_INVOKE ( MPI_COMM_WORLD, MPI_ERR_COMM,
FUNC_NAME);
if ( NULL == newcomm )
return OMPI_ERRHANDLER_INVOKE ( intercomm, MPI_ERR_ARG,
FUNC_NAME);
}
#if OPAL_ENABLE_FT_MPI
/*
* An early check, so as to return early if we are using a broken
* communicator. This is not absolutely necessary since we will
* check for this, and other, error conditions during the operation.
*/
if( OPAL_UNLIKELY(!ompi_comm_iface_create_check(intercomm, &rc)) ) {
OMPI_ERRHANDLER_RETURN(rc, intercomm, rc, FUNC_NAME);
}
#endif
local_size = ompi_comm_size ( intercomm );
remote_size = ompi_comm_remote_size ( intercomm );
total_size = local_size + remote_size;
procs = (ompi_proc_t **) malloc ( total_size * sizeof(ompi_proc_t *));
if ( NULL == procs ) {
rc = MPI_ERR_INTERN;
goto exit;
}
first = ompi_comm_determine_first ( intercomm, thigh );
if ( MPI_UNDEFINED == first ) {
rc = MPI_ERR_INTERN;
goto exit;
}
if ( first ) {
ompi_group_union ( intercomm->c_local_group, intercomm->c_remote_group, &new_group_pointer );
}
else {
ompi_group_union ( intercomm->c_remote_group, intercomm->c_local_group, &new_group_pointer );
}
rc = ompi_comm_set ( &newcomp, /* new comm */
intercomm, /* old comm */
total_size, /* local_size */
NULL, /* local_procs*/
0, /* remote_size */
NULL, /* remote_procs */
NULL, /* attrs */
intercomm->error_handler, /* error handler*/
new_group_pointer, /* local group */
NULL, /* remote group */
0);
if ( MPI_SUCCESS != rc ) {
goto exit;
}
OBJ_RELEASE(new_group_pointer);
new_group_pointer = MPI_GROUP_NULL;
/* Determine context id */
rc = ompi_comm_nextcid (newcomp, intercomm, NULL, NULL, NULL, false,
OMPI_COMM_CID_INTER);
if ( OMPI_SUCCESS != rc ) {
goto exit;
}
/* activate communicator and init coll-module */
rc = ompi_comm_activate (&newcomp, intercomm, NULL, NULL, NULL, false,
OMPI_COMM_CID_INTER);
if ( OMPI_SUCCESS != rc ) {
goto exit;
}
exit:
if ( NULL != procs ) {
free ( procs );
}
if ( MPI_SUCCESS != rc ) {
if ( MPI_COMM_NULL != newcomp && NULL != newcomp ) {
OBJ_RELEASE(newcomp);
}
*newcomm = MPI_COMM_NULL;
return OMPI_ERRHANDLER_INVOKE(intercomm, rc, FUNC_NAME);
}
*newcomm = newcomp;
return MPI_SUCCESS;
}
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