2 // System.Diagnostics.Stopwatch.cs
5 // Zoltan Varga (vargaz@gmail.com)
6 // Atsushi Enomoto <atsushi@ximian.com>
8 // (C) 2006 Novell, Inc.
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:
20 // The above copyright notice and this permission notice shall be
21 // included in all copies or substantial portions of the Software.
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.
33 using System.ComponentModel;
34 using System.Runtime.InteropServices;
35 using System.Runtime.CompilerServices;
37 namespace System.Diagnostics
39 public class Stopwatch
41 [MethodImplAttribute(MethodImplOptions.InternalCall)]
42 public static extern long GetTimestamp ();
44 public static readonly long Frequency = 10000000;
46 public static readonly bool IsHighResolution = true;
48 public static Stopwatch StartNew ()
50 Stopwatch s = new Stopwatch ();
63 public TimeSpan Elapsed {
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)));
71 return TimeSpan.FromTicks (ElapsedTicks);
76 public long ElapsedMilliseconds {
79 if (IsHighResolution) {
80 return (long)(ElapsedTicks / (Frequency / 1000));
83 return (long) Elapsed.TotalMilliseconds;
89 public long ElapsedTicks {
90 get { return is_running ? GetTimestamp () - started + elapsed : elapsed; }
93 public bool IsRunning {
94 get { return is_running; }
107 started = GetTimestamp ();
115 elapsed += GetTimestamp () - started;
121 public void Restart ()
123 started = GetTimestamp ();