/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
*
* (C) 2001 by Argonne National Laboratory.
* See COPYRIGHT in top-level directory.
*/
#include "mpiimpl.h"
#include "group.h"
/* -- Begin Profiling Symbol Block for routine MPI_Group_intersection */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Group_intersection = PMPI_Group_intersection
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Group_intersection MPI_Group_intersection
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Group_intersection as PMPI_Group_intersection
#elif defined(HAVE_WEAK_ATTRIBUTE)
int MPI_Group_intersection(MPI_Group group1, MPI_Group group2, MPI_Group * newgroup)
__attribute__ ((weak, alias("PMPI_Group_intersection")));
#endif
/* -- End Profiling Symbol Block */
/* Define MPICH_MPI_FROM_PMPI if weak symbols are not supported to build
the MPI routines */
#ifndef MPICH_MPI_FROM_PMPI
#undef MPI_Group_intersection
#define MPI_Group_intersection PMPI_Group_intersection
#undef FUNCNAME
#define FUNCNAME MPIR_Group_intersection_impl
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
int MPIR_Group_intersection_impl(MPIR_Group * group_ptr1, MPIR_Group * group_ptr2,
MPIR_Group ** new_group_ptr)
{
int mpi_errno = MPI_SUCCESS;
int size1, i, k, g1_idx, g2_idx, l1_pid, l2_pid, nnew;
MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPIR_GROUP_INTERSECTION_IMPL);
MPIR_FUNC_TERSE_ENTER(MPID_STATE_MPIR_GROUP_INTERSECTION_IMPL);
/* Return a group consisting of the members of group1 that are
* in group2 */
size1 = group_ptr1->size;
/* Insure that the lpid lists are setup */
MPIR_Group_setup_lpid_pairs(group_ptr1, group_ptr2);
for (i = 0; i < size1; i++) {
group_ptr1->lrank_to_lpid[i].flag = 0;
}
g1_idx = group_ptr1->idx_of_first_lpid;
g2_idx = group_ptr2->idx_of_first_lpid;
nnew = 0;
while (g1_idx >= 0 && g2_idx >= 0) {
l1_pid = group_ptr1->lrank_to_lpid[g1_idx].lpid;
l2_pid = group_ptr2->lrank_to_lpid[g2_idx].lpid;
if (l1_pid < l2_pid) {
g1_idx = group_ptr1->lrank_to_lpid[g1_idx].next_lpid;
} else if (l1_pid > l2_pid) {
g2_idx = group_ptr2->lrank_to_lpid[g2_idx].next_lpid;
} else {
/* Equal */
group_ptr1->lrank_to_lpid[g1_idx].flag = 1;
g1_idx = group_ptr1->lrank_to_lpid[g1_idx].next_lpid;
g2_idx = group_ptr2->lrank_to_lpid[g2_idx].next_lpid;
nnew++;
}
}
/* Create the group. Handle the trivial case first */
if (nnew == 0) {
*new_group_ptr = MPIR_Group_empty;
goto fn_exit;
}
mpi_errno = MPIR_Group_create(nnew, new_group_ptr);
if (mpi_errno)
MPIR_ERR_POP(mpi_errno);
(*new_group_ptr)->rank = MPI_UNDEFINED;
(*new_group_ptr)->is_local_dense_monotonic = TRUE;
k = 0;
for (i = 0; i < size1; i++) {
if (group_ptr1->lrank_to_lpid[i].flag) {
int lpid = group_ptr1->lrank_to_lpid[i].lpid;
(*new_group_ptr)->lrank_to_lpid[k].lpid = lpid;
if (i == group_ptr1->rank)
(*new_group_ptr)->rank = k;
if (lpid > MPIR_Process.comm_world->local_size ||
(k > 0 && (*new_group_ptr)->lrank_to_lpid[k - 1].lpid != (lpid - 1))) {
(*new_group_ptr)->is_local_dense_monotonic = FALSE;
}
k++;
}
}
fn_exit:
MPIR_FUNC_TERSE_EXIT(MPID_STATE_MPIR_GROUP_INTERSECTION_IMPL);
return mpi_errno;
fn_fail:
goto fn_exit;
}
#endif
#undef FUNCNAME
#define FUNCNAME MPI_Group_intersection
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
/*@
MPI_Group_intersection - Produces a group as the intersection of two existing
groups
Input Parameters:
+ group1 - first group (handle)
- group2 - second group (handle)
Output Parameters:
. newgroup - intersection group (handle)
Notes:
The output group contains those processes that are in both 'group1' and
'group2'.
.N ThreadSafe
.N Fortran
.N Errors
.N MPI_SUCCESS
.N MPI_ERR_GROUP
.N MPI_ERR_EXHAUSTED
.seealso: MPI_Group_free
@*/
int MPI_Group_intersection(MPI_Group group1, MPI_Group group2, MPI_Group * newgroup)
{
int mpi_errno = MPI_SUCCESS;
MPIR_Group *group_ptr1 = NULL;
MPIR_Group *group_ptr2 = NULL;
MPIR_Group *new_group_ptr;
MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_GROUP_INTERSECTION);
MPIR_ERRTEST_INITIALIZED_ORDIE();
MPID_THREAD_CS_ENTER(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
MPIR_FUNC_TERSE_ENTER(MPID_STATE_MPI_GROUP_INTERSECTION);
/* Validate parameters, especially handles needing to be converted */
#ifdef HAVE_ERROR_CHECKING
{
MPID_BEGIN_ERROR_CHECKS;
{
MPIR_ERRTEST_GROUP(group1, mpi_errno);
MPIR_ERRTEST_GROUP(group2, mpi_errno);
}
MPID_END_ERROR_CHECKS;
}
#endif
/* Convert MPI object handles to object pointers */
MPIR_Group_get_ptr(group1, group_ptr1);
MPIR_Group_get_ptr(group2, group_ptr2);
/* Validate parameters and objects (post conversion) */
#ifdef HAVE_ERROR_CHECKING
{
MPID_BEGIN_ERROR_CHECKS;
{
/* Validate group_ptr */
MPIR_Group_valid_ptr(group_ptr1, mpi_errno);
MPIR_Group_valid_ptr(group_ptr2, mpi_errno);
/* If either group_ptr is not valid, it will be reset to null */
if (mpi_errno)
goto fn_fail;
MPIR_ERRTEST_ARGNULL(newgroup, "newgroup", mpi_errno);
}
MPID_END_ERROR_CHECKS;
}
#endif /* HAVE_ERROR_CHECKING */
/* ... body of routine ... */
mpi_errno = MPIR_Group_intersection_impl(group_ptr1, group_ptr2, &new_group_ptr);
if (mpi_errno)
goto fn_fail;
MPIR_OBJ_PUBLISH_HANDLE(*newgroup, new_group_ptr->handle);
/* ... end of body of routine ... */
fn_exit:
MPIR_FUNC_TERSE_EXIT(MPID_STATE_MPI_GROUP_INTERSECTION);
MPID_THREAD_CS_EXIT(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
return mpi_errno;
fn_fail:
/* --BEGIN ERROR HANDLING-- */
#ifdef HAVE_ERROR_CHECKING
{
mpi_errno =
MPIR_Err_create_code(mpi_errno, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, MPI_ERR_OTHER,
"**mpi_group_intersection", "**mpi_group_intersection %G %G %p",
group1, group2, newgroup);
}
#endif
mpi_errno = MPIR_Err_return_comm(NULL, FCNAME, mpi_errno);
goto fn_exit;
/* --END ERROR HANDLING-- */
}