1/*
2 * Copyright (c) 2019, 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
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23 */
24
25#ifndef SHARE_GC_G1_G1SHAREDDIRTYCARDQUEUE_HPP
26#define SHARE_GC_G1_G1SHAREDDIRTYCARDQUEUE_HPP
27
28#include "utilities/globalDefinitions.hpp"
29
30class G1DirtyCardQueueSet;
31
32// A dirty card queue providing thread-safe enqueue. A shared global
33// instance can be used for cases where a thread-local dirty card can't
34// be used.
35class G1SharedDirtyCardQueue {
36 G1DirtyCardQueueSet* const _qset;
37 void** _buffer;
38 size_t _index;
39
40 // Noncopyable
41 G1SharedDirtyCardQueue(const G1SharedDirtyCardQueue&);
42 G1SharedDirtyCardQueue& operator=(const G1SharedDirtyCardQueue&);
43
44public:
45 G1SharedDirtyCardQueue(G1DirtyCardQueueSet* qset);
46 ~G1SharedDirtyCardQueue(); // flushes the queue.
47
48 // Thread-safe addition to shared logging buffer.
49 void enqueue(void* card_ptr);
50
51 // Flush any pending entries to the qset and remove the buffer.
52 // Not thread-safe.
53 void flush();
54
55 // Discard any pending entries.
56 // Not thread-safe.
57 void reset();
58};
59
60#endif // SHARE_GC_G1_G1SHAREDDIRTYCARDQUEUE_HPP
61