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/*
* 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 (c) 2007 Cisco, Inc. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include <stdio.h>
#include "ompi/mpi/c/bindings.h"
#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Comm_compare = PMPI_Comm_compare
#endif
#if OMPI_PROFILING_DEFINES
#include "ompi/mpi/c/profile/defines.h"
#endif
static const char FUNC_NAME[] = "MPI_Comm_compare";
int MPI_Comm_compare(MPI_Comm comm1, MPI_Comm comm2, int *result) {
/* local variables */
ompi_communicator_t *comp1, *comp2;
ompi_group_t *group1, *group2;
int size1, size2, rsize1, rsize2;
int lresult, rresult=MPI_CONGRUENT;
int sameranks=1;
int sameorder=1;
int i, j;
int found = 0;
if ( MPI_PARAM_CHECK ) {
OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
if (ompi_comm_invalid(comm1) || ompi_comm_invalid(comm2)) {
return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_COMM,
FUNC_NAME);
}
if ( NULL == result ) {
return OMPI_ERRHANDLER_INVOKE(comm1, MPI_ERR_ARG,
FUNC_NAME);
}
}
comp1 = (ompi_communicator_t *) comm1;
comp2 = (ompi_communicator_t *) comm2;
if ( comp1->c_contextid == comp2->c_contextid ) {
*result = MPI_IDENT;
return MPI_SUCCESS;
}
if ( MPI_COMM_NULL == comm1 || MPI_COMM_NULL == comm2 ) {
*result = MPI_UNEQUAL;
return MPI_SUCCESS;
}
/* compare sizes of local and remote groups */
size1 = ompi_comm_size (comp1);
size2 = ompi_comm_size (comp2);
rsize1 = ompi_comm_remote_size (comp1);
rsize2 = ompi_comm_remote_size (comp2);
if ( size1 != size2 || rsize1 != rsize2 ) {
*result = MPI_UNEQUAL;
return MPI_SUCCESS;
}
/* Compare local groups */
/* we need to check whether the communicators contain
the same processes and in the same order */
group1 = (ompi_group_t *)comp1->c_local_group;
group2 = (ompi_group_t *)comp2->c_local_group;
for ( i = 0; i < size1; i++ ) {
if ( group1->grp_proc_pointers[i] != group2->grp_proc_pointers[i]) {
sameorder = 0;
break;
}
}
for ( i = 0; i < size1; i++ ) {
found = 0;
for ( j = 0; j < size2; j++ ) {
if ( group1->grp_proc_pointers[i] == group2->grp_proc_pointers[j]) {
found = 1;
break;
}
}
if ( !found ) {
sameranks = 0;
break;
}
}
if ( sameranks && sameorder )
lresult = MPI_CONGRUENT;
else if ( sameranks && !sameorder )
lresult = MPI_SIMILAR;
else
lresult = MPI_UNEQUAL;
if ( rsize1 > 0 ) {
/* Compare remote groups for inter-communicators */
/* we need to check whether the communicators contain
the same processes and in the same order */
sameranks = sameorder = 1;
group1 = (ompi_group_t *)comp1->c_remote_group;
group2 = (ompi_group_t *)comp2->c_remote_group;
for ( i = 0; i < rsize1; i++ ) {
if ( group1->grp_proc_pointers[i] != group2->grp_proc_pointers[i]) {
sameorder = 0;
break;
}
}
for ( i = 0; i < rsize1; i++ ) {
found = 0;
for ( j = 0; j < rsize2; j++ ) {
if ( group1->grp_proc_pointers[i] == group2->grp_proc_pointers[j]) {
found = 1;
break;
}
}
if ( !found ) {
sameranks = 0;
break;
}
}
if ( sameranks && sameorder )
rresult = MPI_CONGRUENT;
else if ( sameranks && !sameorder )
rresult = MPI_SIMILAR;
else
rresult = MPI_UNEQUAL;
}
/* determine final results */
if ( MPI_CONGRUENT == rresult ) {
*result = lresult;
}
else if ( MPI_SIMILAR == rresult ) {
if ( MPI_SIMILAR == lresult || MPI_CONGRUENT == lresult ) {
*result = MPI_SIMILAR;
}
else
*result = MPI_UNEQUAL;
}
else if ( MPI_UNEQUAL == rresult )
*result = MPI_UNEQUAL;
return MPI_SUCCESS;
}
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