openmpi/ompi/mpi/c/group_incl.c

/*
 * 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.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 */
#include "ompi_config.h"
#include <stdio.h>

#include "mpi/c/bindings.h"
#include "ompi/group/group.h"
#include "ompi/errhandler/errhandler.h"
#include "ompi/communicator/communicator.h"
#include "ompi/proc/proc.h"

#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Group_incl = PMPI_Group_incl
#endif

#if OMPI_PROFILING_DEFINES
#include "mpi/c/profile/defines.h"
#endif

static const char FUNC_NAME[] = "MPI_Group_incl";


int MPI_Group_incl(MPI_Group group, int n, int *ranks, MPI_Group *new_group) 
{
    /* local variables */
    int proc,my_group_rank;
    ompi_group_t *group_pointer, *new_group_pointer;
    ompi_proc_t *my_proc_pointer;

    group_pointer = (ompi_group_t *)group;

    if( MPI_PARAM_CHECK ) {
        OMPI_ERR_INIT_FINALIZE(FUNC_NAME);

        /* verify that group is valid group */
        if ( (MPI_GROUP_NULL == group) || ( NULL == group) 
                || NULL == ranks ) {
            return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_GROUP,
                                          FUNC_NAME);
        }

        /* check that new group is no larger than old group */
        if ( n > group_pointer->grp_proc_count) {
            return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_RANK,
                                          FUNC_NAME);
        }

    }  /* end if( MPI_CHECK_ARGS) */


    if ( 0 == n ) {
        *new_group = MPI_GROUP_EMPTY;
        OBJ_RETAIN(MPI_GROUP_EMPTY);
        return MPI_SUCCESS;
    }

    /* get new group struct */
    new_group_pointer=ompi_group_allocate(n);
    if( NULL == new_group_pointer ) {
        return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_GROUP,
                                      FUNC_NAME);
    }

    /* put group elements in the list */
    for (proc = 0; proc < n; proc++) {
        if ((ranks[proc] < 0) ||
                (ranks[proc] >= group_pointer->grp_proc_count)){
            return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_RANK,
                                          FUNC_NAME);
        }

        new_group_pointer->grp_proc_pointers[proc] =
            group_pointer->grp_proc_pointers[ranks[proc]];

    }                           /* end proc loop */

    /* increment proc reference counters */
    ompi_group_increment_proc_count(new_group_pointer);

    /* find my rank */
    my_group_rank=group_pointer->grp_my_rank;
    my_proc_pointer=group_pointer->grp_proc_pointers[my_group_rank];
    ompi_set_group_rank(new_group_pointer,my_proc_pointer);

    *new_group = (MPI_Group)new_group_pointer;

    return MPI_SUCCESS;
}