Stopwatch.cs :  » 2.6.4-mono-.net-core » System.Diagnostics » System » Diagnostics » C# / CSharp Open Source

//
// System.Diagnostics.Stopwatch.cs
//
// Authors:
//   Zoltan Varga (vargaz@gmail.com)
//   Atsushi Enomoto  <atsushi@ximian.com>
//
// (C) 2006 Novell, Inc.
//

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

#if NET_2_0

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

namespace System.Diagnostics{
  public class Stopwatch
  {
    [MethodImplAttribute(MethodImplOptions.InternalCall)]
    public static extern long GetTimestamp ();

    public static readonly long Frequency = 10000000;

    public static readonly bool IsHighResolution = true;

    public static Stopwatch StartNew ()
    {
      Stopwatch s = new Stopwatch ();
      s.Start ();
      return s;
    }

    public Stopwatch ()
    {
    }

    long elapsed;
    long started;
    bool is_running;

    public TimeSpan Elapsed {
      get {
        if (IsHighResolution) {
          // convert our ticks to TimeSpace ticks, 100 nano second units
          // using two divisions helps avoid overflow
          return TimeSpan.FromTicks ((long)(ElapsedTicks / (Frequency / TimeSpan.TicksPerSecond)));
        }
        else {
          return TimeSpan.FromTicks (ElapsedTicks); 
        }
      }
    }

    public long ElapsedMilliseconds {
      get { 
        checked {
          if (IsHighResolution) {
            return (long)(ElapsedTicks / (Frequency / 1000));
          }
          else {
            return (long) Elapsed.TotalMilliseconds;
          }
        } 
      }
    }

    public long ElapsedTicks {
      get { return is_running ? GetTimestamp () - started + elapsed : elapsed; }
    }

    public bool IsRunning {
      get { return is_running; }
    }

    public void Reset ()
    {
      elapsed = 0;
      is_running = false;
    }

    public void Start ()
    {
      if (is_running)
        return;
      started = GetTimestamp ();
      is_running = true;
    }

    public void Stop ()
    {
      if (!is_running)
        return;
      elapsed += GetTimestamp () - started;
      is_running = false;
    }

#if NET_4_0
    public void Restart ()
    {
      started = GetTimestamp ();
      elapsed = 0;
      is_running = true;
    }
#endif
  }
}

#endif