1/*
2 * Copyright (c) 1997, 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.
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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_RUNTIME_TIMER_HPP
26#define SHARE_RUNTIME_TIMER_HPP
27
28#include "utilities/globalDefinitions.hpp"
29
30// Timers for simple measurement.
31
32class elapsedTimer {
33 friend class VMStructs;
34 private:
35 jlong _counter;
36 jlong _start_counter;
37 bool _active;
38 public:
39 elapsedTimer() { _active = false; reset(); }
40 elapsedTimer(jlong time, jlong timeUnitsPerSecond);
41 void add(elapsedTimer t);
42 void start();
43 void stop();
44 void reset() { _counter = 0; }
45 double seconds() const;
46 jlong milliseconds() const;
47 jlong ticks() const { return _counter; }
48 jlong active_ticks() const;
49 bool is_active() const { return _active; }
50};
51
52// TimeStamp is used for recording when an event took place.
53class TimeStamp {
54 private:
55 jlong _counter;
56 public:
57 TimeStamp() { _counter = 0; }
58 void clear() { _counter = 0; }
59 // has the timestamp been updated since being created or cleared?
60 bool is_updated() const { return _counter != 0; }
61 // update to current elapsed time
62 void update();
63 // update to given elapsed time
64 void update_to(jlong ticks);
65 // returns seconds since updated
66 // (must not be in a cleared state: must have been previously updated)
67 double seconds() const;
68 jlong milliseconds() const;
69 // ticks elapsed between VM start and last update
70 jlong ticks() const { return _counter; }
71 // ticks elapsed since last update
72 jlong ticks_since_update() const;
73};
74
75class TimeHelper {
76 public:
77 static double counter_to_seconds(jlong counter);
78 static double counter_to_millis(jlong counter);
79 static jlong millis_to_counter(jlong millis);
80};
81
82#endif // SHARE_RUNTIME_TIMER_HPP
83