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 #if NET_2_0
  33
  34 using System;
  35 using System.ComponentModel;
  36 using System.Runtime.InteropServices;
  37 using System.Runtime.CompilerServices;
  38
  39 namespace System.Diagnostics
  40 {
  41         public class Stopwatch
  42         {
  43                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  44                 public static extern long GetTimestamp ();
  45
  46                 public static readonly long Frequency = 10000000;
  47
  48                 public static readonly bool IsHighResolution = true;
  49
  50                 public static Stopwatch StartNew ()
  51                 {
  52                         Stopwatch s = new Stopwatch ();
  53                         s.Start ();
  54                         return s;
  55                 }
  56
  57                 public Stopwatch ()
  58                 {
  59                 }
  60
  61                 long elapsed;
  62                 long started;
  63                 bool is_running;
  64
  65                 public TimeSpan Elapsed {
  66                         get {
  67                                 if (IsHighResolution) {
  68                                         // convert our ticks to TimeSpace ticks, 100 nano second units
  69                                         // using two divisions helps avoid overflow
  70                                         return TimeSpan.FromTicks ((long)(ElapsedTicks / (Frequency / TimeSpan.TicksPerSecond)));
  71                                 }
  72                                 else {
  73                                         return TimeSpan.FromTicks (ElapsedTicks);
  74                                 }
  75                         }
  76                 }
  77
  78                 public long ElapsedMilliseconds {
  79                         get {
  80                                 checked {
  81                                         if (IsHighResolution) {
  82                                                 return (long)(ElapsedTicks / (Frequency / 1000));
  83                                         }
  84                                         else {
  85                                                 return (long) Elapsed.TotalMilliseconds;
  86                                         }
  87                                 }
  88                         }
  89                 }
  90
  91                 public long ElapsedTicks {
  92                         get { return is_running ? GetTimestamp () - started + elapsed : elapsed; }
  93                 }
  94
  95                 public bool IsRunning {
  96                         get { return is_running; }
  97                 }
  98
  99                 public void Reset ()
 100                 {
 101                         elapsed = 0;
 102                         is_running = false;
 103                 }
 104
 105                 public void Start ()
 106                 {
 107                         if (is_running)
 108                                 return;
 109                         started = GetTimestamp ();
 110                         is_running = true;
 111                 }
 112
 113                 public void Stop ()
 114                 {
 115                         if (!is_running)
 116                                 return;
 117                         elapsed += GetTimestamp () - started;
 118                         is_running = false;
 119                 }
 120
 121 #if NET_4_0
 122                 public void Restart ()
 123                 {
 124                         started = GetTimestamp ();
 125                         elapsed = 0;
 126                         is_running = true;
 127                 }
 128 #endif
 129         }
 130 }
 131
 132 #endif