1/*
2 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26
27#include "gc/shared/stringdedup/stringDedup.hpp"
28#include "gc/shared/stringdedup/stringDedupQueue.hpp"
29#include "runtime/atomic.hpp"
30
31StringDedupQueue* StringDedupQueue::_queue = NULL;
32volatile size_t StringDedupQueue::_claimed_index = 0;
33
34size_t StringDedupQueue::claim() {
35 return Atomic::add(size_t(1), &_claimed_index) - 1;
36}
37
38void StringDedupQueue::unlink_or_oops_do(StringDedupUnlinkOrOopsDoClosure* cl) {
39 size_t claimed_queue = claim();
40 while (claimed_queue < queue()->num_queues()) {
41 queue()->unlink_or_oops_do_impl(cl, claimed_queue);
42 claimed_queue = claim();
43 }
44}
45
46void StringDedupQueue::print_statistics() {
47 queue()->print_statistics_impl();
48}
49
50void StringDedupQueue::verify() {
51 queue()->verify_impl();
52}
53
54StringDedupQueue* const StringDedupQueue::queue() {
55 assert(_queue != NULL, "Not yet initialized");
56 return _queue;
57}
58
59
60void StringDedupQueue::gc_prologue() {
61 _claimed_index = 0;
62}
63
64void StringDedupQueue::gc_epilogue() {
65 assert(_claimed_index >= queue()->num_queues() || _claimed_index == 0, "All or nothing");
66}
67