mcs/class/System/System.Diagnostics/Stopwatch.cs

   1 //
   2 // System.Diagnostics.Stopwatch.cs
   3 //
   4 // Authors:
   5 //   Zoltan Varga (vargaz@gmail.com)
   6 //   Atsushi Enomoto  <atsushi@ximian.com>
   7 //
   8 // (C) 2006 Novell, Inc.
   9 //
  10
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System;
  33 using System.ComponentModel;
  34 using System.Runtime.InteropServices;
  35 using System.Runtime.CompilerServices;
  36
  37 namespace System.Diagnostics
  38 {
  39         public class Stopwatch
  40         {
  41                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  42                 public static extern long GetTimestamp ();
  43
  44                 public static readonly long Frequency = 10000000;
  45
  46                 public static readonly bool IsHighResolution = true;
  47
  48                 public static Stopwatch StartNew ()
  49                 {
  50                         Stopwatch s = new Stopwatch ();
  51                         s.Start ();
  52                         return s;
  53                 }
  54
  55                 public Stopwatch ()
  56                 {
  57                 }
  58
  59                 long elapsed;
  60                 long started;
  61                 bool is_running;
  62
  63                 public TimeSpan Elapsed {
  64                         get {
  65                                 if (IsHighResolution) {
  66                                         // convert our ticks to TimeSpace ticks, 100 nano second units
  67                                         // using two divisions helps avoid overflow
  68                                         return TimeSpan.FromTicks ((long)(ElapsedTicks / (Frequency / TimeSpan.TicksPerSecond)));
  69                                 }
  70                                 else {
  71                                         return TimeSpan.FromTicks (ElapsedTicks);
  72                                 }
  73                         }
  74                 }
  75
  76                 public long ElapsedMilliseconds {
  77                         get {
  78                                 checked {
  79                                         if (IsHighResolution) {
  80                                                 return (long)(ElapsedTicks / (Frequency / 1000));
  81                                         }
  82                                         else {
  83                                                 return (long) Elapsed.TotalMilliseconds;
  84                                         }
  85                                 }
  86                         }
  87                 }
  88
  89                 public long ElapsedTicks {
  90                         get { return is_running ? GetTimestamp () - started + elapsed : elapsed; }
  91                 }
  92
  93                 public bool IsRunning {
  94                         get { return is_running; }
  95                 }
  96
  97                 public void Reset ()
  98                 {
  99                         elapsed = 0;
 100                         is_running = false;
 101                 }
 102
 103                 public void Start ()
 104                 {
 105                         if (is_running)
 106                                 return;
 107                         started = GetTimestamp ();
 108                         is_running = true;
 109                 }
 110
 111                 public void Stop ()
 112                 {
 113                         if (!is_running)
 114                                 return;
 115                         elapsed += GetTimestamp () - started;
 116                         if (elapsed < 0)
 117                                 elapsed = 0;
 118                         is_running = false;
 119                 }
 120
 121                 public void Restart ()
 122                 {
 123                         started = GetTimestamp ();
 124                         elapsed = 0;
 125                         is_running = true;
 126                 }
 127         }
 128 }
 129