1 /*
 2  * Copyright (c) 1997, 2020, 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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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 
32 class 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   void add(elapsedTimer t);
41   void add_nanoseconds(jlong ns);
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.
53 class TimeStamp {
54  private:
55   jlong _counter;
56  public:
57   TimeStamp()  { _counter = 0; }
58   // has the timestamp been updated since being created or cleared?
59   bool is_updated() const { return _counter != 0; }
60   // update to current elapsed time
61   void update();
62   // update to given elapsed time
63   void update_to(jlong ticks);
64   // returns seconds since updated
65   // (must not be in a cleared state:  must have been previously updated)
66   double seconds() const;
67   jlong milliseconds() const;
68   // ticks elapsed between VM start and last update
69   jlong ticks() const { return _counter; }
70   // ticks elapsed since last update
71   jlong ticks_since_update() const;
72 };
73 
74 class TimeHelper {
75  public:
76   static double counter_to_seconds(jlong counter);
77   static double counter_to_millis(jlong counter);
78   static jlong millis_to_counter(jlong millis);
79   static jlong micros_to_counter(jlong micros);
80 };
81 
82 #endif // SHARE_RUNTIME_TIMER_HPP