1/*
2 * Copyright (c) 2014, 2015, 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#ifndef SHARE_VM_GC_SHARED_GCID_HPP
26#define SHARE_VM_GC_SHARED_GCID_HPP
27
28#include "memory/allocation.hpp"
29
30class GCId : public AllStatic {
31  friend class GCIdMark;
32  friend class GCIdMarkAndRestore;
33  static uint _next_id;
34  static const uint UNDEFINED = (uint)-1;
35  static const uint create();
36
37 public:
38  // Returns the currently active GC id. Asserts that there is an active GC id.
39  static const uint current();
40  // Same as current() but can return undefined() if no GC id is currently active
41  static const uint current_raw();
42  // Returns the next expected GCId.
43  static const uint peek();
44  static const uint undefined() { return UNDEFINED; }
45  static size_t print_prefix(char* buf, size_t len);
46};
47
48class GCIdMark : public StackObj {
49  uint _gc_id;
50 public:
51  GCIdMark();
52  GCIdMark(uint gc_id);
53  ~GCIdMark();
54};
55
56class GCIdMarkAndRestore : public StackObj {
57  uint _gc_id;
58  uint _previous_gc_id;
59 public:
60  GCIdMarkAndRestore();
61  GCIdMarkAndRestore(uint gc_id);
62  ~GCIdMarkAndRestore();
63};
64
65#endif // SHARE_VM_GC_SHARED_GCID_HPP
66