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/*
* Copyright (c) 2001-2003 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: ccreate.c,v 6.9 2003/02/20 19:45:27 jsquyres Exp $
*
* Function: - create a new communicator
* Accepts: - old communicator
* - new group
* - ptr new communicator
* Returns: - MPI_SUCCESS or error code
*/
#include <stdlib.h>
#include <lam_config.h>
#include <blktype.h>
#include <mpi.h>
#include <mpisys.h>
#include <terror.h>
#include <lam-ssi-coll.h>
/*@
MPI_Comm_create - Creates a new communicator
Input Parameters:
+ comm - communicator (handle)
- group - group, which is a subset of the group of 'comm' (handle)
Output Parameter:
. newcomm - new communicator (handle)
Notes:
When a communicator is no longer being used, it should be freed with
'MPI_Comm_free'.
.N fortran
.N Errors
.N MPI_SUCCESS
.N MPI_ERR_COMM
.N MPI_ERR_GROUP
.N MPI_ERR_EXHAUSTED
.N MPI_ERR_INTERN
.seealso: MPI_Comm_free
.N ACK
@*/
int MPI_Comm_create(MPI_Comm comm, MPI_Group group,
MPI_Comm *newcomm)
{
int cid; /* global max context ID */
int rank; /* process rank */
int err; /* error code */
lam_initerr();
lam_setfunc(BLKMPICOMMCREATE);
/*
* Check the arguments.
*/
if (comm == MPI_COMM_NULL) {
return(lam_errfunc(MPI_COMM_WORLD, BLKMPICOMMCREATE,
lam_mkerr(MPI_ERR_COMM, EINVAL)));
}
if (LAM_IS_INTER(comm)) {
return(lam_errfunc(comm, BLKMPICOMMCREATE,
lam_mkerr(MPI_ERR_COMM, EINVAL)));
}
if (group == MPI_GROUP_NULL) {
return(lam_errfunc(comm, BLKMPICOMMCREATE,
lam_mkerr(MPI_ERR_GROUP, EINVAL)));
}
if (newcomm == 0) {
return(lam_errfunc(comm, BLKMPICOMMCREATE,
lam_mkerr(MPI_ERR_ARG, EINVAL)));
}
#if LAM_WANT_IMPI
/* Remove this when IMPI collectives are implemented */
if (LAM_IS_IMPI(comm)) {
return lam_err_comm(comm, MPI_ERR_COMM, ENOSYS,
"Collectives not yet implemented on IMPI communicators");
}
#endif
/*
* Set up tracing.
*/
LAM_TRACE(lam_tr_cffstart(BLKMPICOMMCREATE));
/* Collectively decide what the new CID will be. Processes
not in the group participate but do not affect the final
CID. */
rank = group->g_myrank;
err = lam_coll_alloc_intra_cid(comm, (rank == MPI_UNDEFINED) ? 0 : 1,
BLKMPICOMMCREATE, &cid);
if (err != MPI_SUCCESS) {
LAM_TRACE(lam_tr_cffend(BLKMPICOMMCREATE, -1, comm, 0, 0));
lam_resetfunc(BLKMPICOMMCREATE);
return(lam_errfunc(comm, BLKMPICOMMCREATE, err));
}
if (rank == MPI_UNDEFINED) {
*newcomm = MPI_COMM_NULL;
LAM_TRACE(lam_tr_cffend(BLKMPICOMMCREATE, -1, comm, 0, 0));
lam_resetfunc(BLKMPICOMMCREATE);
return(MPI_SUCCESS);
}
/*
* Create the new communicator.
*/
*newcomm = 0;
if (lam_comm_new(cid, group, MPI_GROUP_NULL, 0, newcomm)) {
return(lam_errfunc(comm, BLKMPICOMMCREATE,
lam_mkerr(MPI_ERR_OTHER, errno)));
}
group->g_refcount++;
(*newcomm)->c_errhdl = comm->c_errhdl;
comm->c_errhdl->eh_refcount++;
if (!al_insert(lam_comms, newcomm)) {
return(lam_errfunc(comm, BLKMPICOMMCREATE,
lam_mkerr(MPI_ERR_INTERN, errno)));
}
if (lam_tr_comm(*newcomm)) {
return(lam_errfunc(comm, BLKMPICOMMCREATE,
lam_mkerr(MPI_ERR_INTERN, errno)));
}
lam_setcid(cid);
/* Let the collective SSI modules battle over who will do
collectives on this new communicator. It'll likely be the
same as the one that's on this communicator, but we still
give them the option to do something different anyway... */
if (lam_ssi_coll_base_init_comm(*newcomm) != 0)
return(lam_errfunc(comm, BLKMPICOMMCREATE,
lam_mkerr(MPI_ERR_INTERN, ENOSYS)));
LAM_TRACE(lam_tr_cffend(BLKMPICOMMCREATE, -1, comm, 0, 0));
lam_resetfunc(BLKMPICOMMCREATE);
return(MPI_SUCCESS);
}
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