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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) 2006 Cisco Systems, Inc. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include <string.h>
#include "ompi/mpi/c/bindings.h"
#include "ompi/communicator/communicator.h"
#include "ompi/proc/proc.h"
#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Intercomm_merge = PMPI_Intercomm_merge
#endif
#if OMPI_PROFILING_DEFINES
#include "ompi/mpi/c/profile/defines.h"
#endif
#define INTERCOMM_MERGE_TAG 1010
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 local_size, remote_size;
int local_rank;
int first;
int total_size;
int rc=MPI_SUCCESS;
int thigh = high;
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);
}
local_size = ompi_comm_size ( intercomm );
local_rank = ompi_comm_rank ( 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 ) {
memcpy ( procs, intercomm->c_local_group->grp_proc_pointers,
local_size * sizeof(ompi_proc_t *));
memcpy ( &procs[local_size], intercomm->c_remote_group->grp_proc_pointers,
remote_size * sizeof(ompi_proc_t *));
}
else {
memcpy ( procs, intercomm->c_remote_group->grp_proc_pointers,
remote_size * sizeof(ompi_proc_t *));
memcpy ( &procs[remote_size], intercomm->c_local_group->grp_proc_pointers,
local_size * sizeof(ompi_proc_t *));
}
newcomp = ompi_comm_allocate ( total_size, 0 );
if ( NULL == newcomp ) {
rc = MPI_ERR_INTERN;
goto exit;
}
/* Determine context id. It is identical to f_2_c_handle */
rc = ompi_comm_nextcid ( newcomp, /* new comm */
intercomm, /* old comm */
NULL, /* bridge comm */
NULL, /* local leader */
NULL, /* remote_leader */
OMPI_COMM_CID_INTER, /* mode */
-1 ); /* send_first */
if ( OMPI_SUCCESS != rc ) {
goto exit;
}
rc = ompi_comm_set ( newcomp, /* new comm */
intercomm, /* old comm */
total_size, /* local_size */
procs, /* local_procs*/
0, /* remote_size */
NULL, /* remote_procs */
NULL, /* attrs */
intercomm->error_handler, /* error handler*/
NULL /* topo mpodule */
);
if ( MPI_SUCCESS != rc ) {
goto exit;
}
/* activate communicator and init coll-module */
rc = ompi_comm_activate ( newcomp, /* new comm */
intercomm, /* old comm */
NULL, /* bridge comm */
NULL, /* local leader */
NULL, /* remote_leader */
OMPI_COMM_CID_INTER, /* mode */
-1, /* send_first */
NULL ); /* coll module */
if ( OMPI_SUCCESS != rc ) {
goto exit;
}
exit:
if ( NULL != procs ) {
free ( procs );
}
if ( MPI_SUCCESS != rc ) {
if ( MPI_COMM_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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