2004-01-25 04:51:49 +03:00
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/*
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* $HEADERS$
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*/
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#include "lam_config.h"
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#include <stdio.h>
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#include "mpi.h"
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#include "mpi/interface/c/bindings.h"
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2004-02-27 22:22:14 +03:00
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#include "mpi/group/group.h"
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2004-01-25 04:51:49 +03:00
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#if LAM_HAVE_WEAK_SYMBOLS && LAM_PROFILING_DEFINES
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#pragma weak MPI_Group_difference = PMPI_Group_difference
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#endif
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int MPI_Group_difference(MPI_Group group1, MPI_Group group2,
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2004-02-27 22:22:14 +03:00
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MPI_Group *new_group) {
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/* local varibles */
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int return_value, new_group_size, proc1, proc2, found_in_group2, cnt;
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lam_group_t *group1_pointer, *group2_pointer, *new_group_pointer;
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lam_proc_t *proc1_pointer, *proc2_pointer;
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return_value=MPI_SUCCESS;
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group1_pointer=(lam_group_t *)group1;
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group2_pointer=(lam_group_t *)group2;
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/* the difference of an empty group and anything is an empty group */
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if (MPI_GROUP_EMPTY == group1 ) {
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*new_group = MPI_GROUP_EMPTY;
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return MPI_SUCCESS;
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}
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/* the difference of a group with the empty group is the group itself */
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if (MPI_GROUP_EMPTY == group2 ) {
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*new_group=group1;
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OBJ_RETAIN(group1_pointer);
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return MPI_SUCCESS;
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}
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/*
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* form union
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*/
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/* get new group size */
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new_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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found_in_group2=0;
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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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found_in_group2=true;
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break;
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}
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} /* end proc1 loop */
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if(found_in_group2)
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continue;
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new_group_size++;
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} /* end proc loop */
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if (new_group_size == 0) {
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*new_group = MPI_GROUP_EMPTY;
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return MPI_SUCCESS;
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}
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/* allocate a new lam_group_t structure */
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new_group_pointer=group_allocate(new_group_size);
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if( NULL == new_group_pointer ) {
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return MPI_ERR_GROUP;
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}
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/* fill in group list */
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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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found_in_group2=0;
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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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found_in_group2=true;
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break;
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}
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} /* end proc1 loop */
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if(found_in_group2)
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continue;
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new_group_pointer->grp_proc_pointers[cnt] =
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group1_pointer->grp_proc_pointers[proc1];
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cnt++;
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} /* end proc loop */
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return return_value;
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2004-01-25 04:51:49 +03:00
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}
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