1/*
2 * Copyright (c) 2013, 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.
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23 */
24
25#ifndef SHARE_VM_UTILITIES_TICKS_HPP
26#define SHARE_VM_UTILITIES_TICKS_HPP
27
28#include "memory/allocation.hpp"
29#include "utilities/globalDefinitions.hpp"
30
31class Ticks;
32
33class Tickspan VALUE_OBJ_CLASS_SPEC {
34  friend class Ticks;
35  friend Tickspan operator-(const Ticks& end, const Ticks& start);
36
37 private:
38  jlong _span_ticks;
39
40  Tickspan(const Ticks& end, const Ticks& start);
41
42 public:
43  Tickspan() : _span_ticks(0) {}
44
45  Tickspan& operator+=(const Tickspan& rhs) {
46    _span_ticks += rhs._span_ticks;
47    return *this;
48  }
49
50  jlong value() const {
51    return _span_ticks;
52  }
53
54};
55
56class Ticks VALUE_OBJ_CLASS_SPEC {
57 private:
58  jlong _stamp_ticks;
59
60 public:
61  Ticks() : _stamp_ticks(0) {
62    assert((_stamp_ticks = invalid_time_stamp) == invalid_time_stamp,
63      "initial unstamped time value assignment");
64  }
65
66  Ticks& operator+=(const Tickspan& span) {
67    _stamp_ticks += span.value();
68    return *this;
69  }
70
71  Ticks& operator-=(const Tickspan& span) {
72    _stamp_ticks -= span.value();
73    return *this;
74  }
75
76  void stamp();
77
78  jlong value() const {
79    return _stamp_ticks;
80  }
81
82  static const Ticks now();
83
84#ifdef ASSERT
85  static const jlong invalid_time_stamp;
86#endif
87
88#ifndef PRODUCT
89  // only for internal use by GC VM tests
90  friend class TimePartitionPhasesIteratorTest;
91  friend class GCTimerTest;
92
93 private:
94  // implicit type conversion
95  Ticks(int ticks) : _stamp_ticks(ticks) {}
96
97#endif // !PRODUCT
98
99};
100
101class TicksToTimeHelper : public AllStatic {
102 public:
103  enum Unit {
104    SECONDS = 1,
105    MILLISECONDS = 1000
106  };
107  static double seconds(const Tickspan& span);
108  static jlong milliseconds(const Tickspan& span);
109};
110
111#endif // SHARE_VM_UTILITIES_TICKS_HPP
112