137 строки
4.3 KiB
C
137 строки
4.3 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2005 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "ompi_config.h"
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#include <stdio.h>
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#include "mpi/c/bindings.h"
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#include "ompi/group/group.h"
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#include "ompi/errhandler/errhandler.h"
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#include "ompi/communicator/communicator.h"
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#include "ompi/proc/proc.h"
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#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
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#pragma weak MPI_Group_intersection = PMPI_Group_intersection
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#endif
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#if OMPI_PROFILING_DEFINES
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#include "mpi/c/profile/defines.h"
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#endif
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static const char FUNC_NAME[] = "MPI_Group_intersection";
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int MPI_Group_intersection(MPI_Group group1, MPI_Group group2,
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MPI_Group *new_group)
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{
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/* local variables */
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int my_group_rank;
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int group_size,proc1,proc2,cnt;
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ompi_group_t *group1_pointer, *group2_pointer, *new_group_pointer;
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ompi_proc_t *proc1_pointer, *proc2_pointer, *my_proc_pointer = NULL;
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if ( MPI_PARAM_CHECK ) {
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OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
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/* verify that groups are valid */
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if ( (MPI_GROUP_NULL == group1) || (MPI_GROUP_NULL == group2) ||
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( NULL == group1) || (NULL == group2) ) {
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return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_GROUP,
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FUNC_NAME);
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}
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}
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group1_pointer=(ompi_group_t *)group1;
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group2_pointer=(ompi_group_t *)group2;
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/*
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* form intersection
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*/
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/* figure out how large the intersection is */
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group_size = 0;
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/* loop over group1 members */
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for (proc1 = 0; proc1 < group1_pointer->grp_proc_count; proc1++) {
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proc1_pointer=group1_pointer->grp_proc_pointers[proc1];
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/* check to see if this proc is in group2 */
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for (proc2 = 0; proc2 < group2_pointer->grp_proc_count; proc2++) {
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proc2_pointer=group2_pointer->grp_proc_pointers[proc2];
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if( proc1_pointer == proc2_pointer ) {
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group_size++;
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break;
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}
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} /* end proc2 loop */
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} /* end proc1 loop */
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if ( 0 == group_size ) {
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*new_group = MPI_GROUP_EMPTY;
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OBJ_RETAIN(MPI_GROUP_EMPTY);
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return MPI_SUCCESS;
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}
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/* fill in new group */
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new_group_pointer=ompi_group_allocate(group_size);
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if( NULL == new_group_pointer ) {
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return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_GROUP,
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FUNC_NAME);
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}
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cnt = 0;
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/* loop over group1 members */
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for (proc1 = 0; proc1 < group1_pointer->grp_proc_count; proc1++) {
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proc1_pointer=group1_pointer->grp_proc_pointers[proc1];
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/* check to see if this proc is in group2 */
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for (proc2 = 0; proc2 < group2_pointer->grp_proc_count; proc2++) {
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proc2_pointer=group2_pointer->grp_proc_pointers[proc2];
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if( proc1_pointer == proc2_pointer ) {
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new_group_pointer->grp_proc_pointers[cnt]=proc1_pointer;
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cnt++;
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break;
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}
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} /* end proc2 loop */
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} /* end proc1 loop */
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/* increment proc reference counters */
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ompi_group_increment_proc_count(new_group_pointer);
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/* find my rank */
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my_group_rank=group1_pointer->grp_my_rank;
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if ( MPI_UNDEFINED != my_group_rank ) {
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my_proc_pointer=group1_pointer->grp_proc_pointers[my_group_rank];
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}
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else {
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my_group_rank=group2_pointer->grp_my_rank;
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if ( MPI_UNDEFINED != my_group_rank ) {
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my_proc_pointer=group2_pointer->grp_proc_pointers[my_group_rank];
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}
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}
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if ( MPI_UNDEFINED == my_group_rank ) {
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new_group_pointer->grp_my_rank = MPI_UNDEFINED;
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}
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else {
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ompi_set_group_rank(new_group_pointer,my_proc_pointer);
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}
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*new_group = (MPI_Group)new_group_pointer;
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return MPI_SUCCESS;
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}
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