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/*
* Copyright (c) 2001-2002 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: gexcl.c,v 6.6 2002/12/11 19:15:11 jsquyres Exp $
*
* Function: - form new group by exclusion
* Accepts: - original group
* - # of processes to exclude
* - ranks
* - ptr new group
* Returns: - MPI_SUCCESS or error code
*/
#include <stdlib.h>
#include <blktype.h>
#include <mpi.h>
#include <mpisys.h>
#include <rpisys.h>
#include <terror.h>
/*@
MPI_Group_excl - Produces a group by reordering an existing group and
taking only unlisted members
Input Parameters:
+ g - group (handle)
. n - number of elements in array 'ranks' (integer)
- ranks - array of integer ranks in 'g' not to appear in 'png'
Output Parameter:
. png - new group derived from above, preserving the order defined by
'group' (handle)
Notes:
Each of the ranks to exclude must be a valid rank in the group and all
elements must be distinct or the function is erroneous.
When a group is no longer being used, it should be freed with
'MPI_Group_free'.
.N fortran
.N Errors
.N MPI_SUCCESS
.N MPI_ERR_GROUP
.N MPI_ERR_ARG
.N MPI_ERR_RANK
.seealso: MPI_Group_free
.N ACK
@*/
int MPI_Group_excl(MPI_Group g, int n, int *ranks,
MPI_Group *png)
{
int i, j;
int *r;
int nproc; /* # processes */
struct _proc **pi, **pj; /* processes in groups */
MPI_Group ng; /* new group */
lam_initerr_m();
lam_setfunc_m(BLKMPIGROUPEXCL);
/*
* Check the arguments.
*/
if (g == MPI_GROUP_NULL) {
return(lam_errfunc(MPI_COMM_WORLD,
BLKMPIGROUPEXCL, lam_mkerr(MPI_ERR_GROUP, EINVAL)));
}
if ((png == 0) || ((n > 0) && (ranks == 0))
|| (n < 0) || (n > g->g_nprocs)) {
return(lam_errfunc(MPI_COMM_WORLD,
BLKMPIGROUPEXCL, lam_mkerr(MPI_ERR_ARG, EINVAL)));
}
/*
* Handle the trivial cases.
*/
if (n == 0) {
*png = g;
g->g_refcount++;
lam_resetfunc_m(BLKMPIGROUPEXCL);
return(MPI_SUCCESS);
}
/*
* Get the # of processes in the new group.
* Flag the excluded processes.
*/
nproc = g->g_nprocs - n;
pi = g->g_procs;
for (r = ranks, i = 0; i < n; ++i, ++r) {
if ((*r < 0) || (*r >= g->g_nprocs)
|| (pi[*r]->p_mode & LAM_PFLAG)) {
for (r = ranks, j = 0; j < i; ++j, ++r) {
pi[*r]->p_mode &= ~LAM_PFLAG;
}
return(lam_errfunc(MPI_COMM_WORLD, BLKMPIGROUPEXCL,
lam_mkerr(MPI_ERR_RANK, EINVAL)));
} else {
pi[*r]->p_mode |= LAM_PFLAG;
}
}
/*
* Handle the empty difference case.
*/
if (nproc == 0) {
*png = MPI_GROUP_EMPTY;
MPI_GROUP_EMPTY->g_refcount++;
for (i = 0, pi = g->g_procs; i < g->g_nprocs; ++i, ++pi) {
(*pi)->p_mode &= ~LAM_PFLAG;
}
lam_resetfunc_m(BLKMPIGROUPEXCL);
return(MPI_SUCCESS);
}
/*
* Allocate a new group.
*/
ng = (MPI_Group) malloc((unsigned) sizeof(struct _group) +
(nproc * sizeof(struct _proc *)));
if (ng == 0) {
for (i = 0, pi = g->g_procs; i < g->g_nprocs; ++i, ++pi) {
(*pi)->p_mode &= ~LAM_PFLAG;
}
return(lam_errfunc(MPI_COMM_WORLD, BLKMPIGROUPEXCL,
lam_mkerr(MPI_ERR_OTHER, errno)));
}
*png = ng;
ng->g_nprocs = nproc;
ng->g_myrank = MPI_UNDEFINED;
ng->g_refcount = 1;
ng->g_f77handle = -1;
ng->g_procs = (struct _proc **) ((char *) ng + sizeof(struct _group));
/*
* Fill the new group processes.
*/
pj = ng->g_procs;
for (i = 0, pi = g->g_procs; i < g->g_nprocs; ++i, ++pi) {
if ((*pi)->p_mode & LAM_PFLAG) {
(*pi)->p_mode &= ~LAM_PFLAG;
} else {
if (*pi == lam_myproc) {
ng->g_myrank = (int) (pj - ng->g_procs);
}
(*pi)->p_refcount++;
*pj = *pi;
++pj;
}
}
lam_resetfunc_m(BLKMPIGROUPEXCL);
return(MPI_SUCCESS);
}
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