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annotate src/share/vm/utilities/ticks.hpp @ 13400:86e6d691f2e1

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8028128: Add a type safe alternative for working with counter based data Reviewed-by: dholmes, egahlin
author mgronlun
date Sat, 23 Nov 2013 12:25:13 +0100
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13400
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1 /*
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_UTILITIES_TICKS_HPP
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26 #define SHARE_VM_UTILITIES_TICKS_HPP
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27
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28 #include "memory/allocation.hpp"
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29 #include "utilities/globalDefinitions.hpp"
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30
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31 class Ticks;
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32
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33 class Tickspan VALUE_OBJ_CLASS_SPEC {
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34 friend class Ticks;
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35 friend Tickspan operator-(const Ticks& end, const Ticks& start);
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36
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37 private:
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38 jlong _span_ticks;
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39
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40 Tickspan(const Ticks& end, const Ticks& start);
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41
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42 public:
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43 Tickspan() : _span_ticks(0) {}
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44
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45 Tickspan& operator+=(const Tickspan& rhs) {
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46 _span_ticks += rhs._span_ticks;
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47 return *this;
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48 }
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49
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50 jlong value() const {
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51 return _span_ticks;
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52 }
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53
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54 };
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55
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56 class Ticks VALUE_OBJ_CLASS_SPEC {
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57 private:
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58 jlong _stamp_ticks;
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59
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60 public:
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61 Ticks() : _stamp_ticks(0) {
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62 assert((_stamp_ticks = invalid_time_stamp) == invalid_time_stamp,
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63 "initial unstamped time value assignment");
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64 }
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65
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66 Ticks& operator+=(const Tickspan& span) {
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67 _stamp_ticks += span.value();
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68 return *this;
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69 }
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70
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71 Ticks& operator-=(const Tickspan& span) {
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72 _stamp_ticks -= span.value();
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73 return *this;
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74 }
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75
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76 void stamp();
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77
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78 jlong value() const {
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79 return _stamp_ticks;
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80 }
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81
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82 static const Ticks now();
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83
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84 #ifdef ASSERT
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85 static const jlong invalid_time_stamp;
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86 #endif
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87
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88 #ifndef PRODUCT
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89 // only for internal use by GC VM tests
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90 friend class TimePartitionPhasesIteratorTest;
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91 friend class GCTimerTest;
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92
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93 private:
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94 // implicit type conversion
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95 Ticks(int ticks) : _stamp_ticks(ticks) {}
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96
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97 #endif // !PRODUCT
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98
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99 };
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100
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101 class TicksToTimeHelper : public AllStatic {
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102 public:
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103 enum Unit {
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104 SECONDS = 1,
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105 MILLISECONDS = 1000
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106 };
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107 static double seconds(const Tickspan& span);
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108 static jlong milliseconds(const Tickspan& span);
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109 };
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110
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111 #endif // SHARE_VM_UTILITIES_TICKS_HPP