//
// Copyright (c) 2004-2006 Jaroslaw Kowalski <jaak@jkowalski.net>
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * Neither the name of Jaroslaw Kowalski nor the names of its
// contributors may be used to endorse or promote products derived from this
// software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
using System;
using System.Threading;
using System.Globalization;
using System.IO;
using System.Xml;
using System.Runtime.InteropServices;
public class StopWatch
{
private long _startTime;
private long _stopTime;
private static long _overhead = 0;
private static long _frequency;
static StopWatch()
{
QueryPerformanceFrequency(out _frequency);
StopWatch callibration = new StopWatch();
long totalOverhead = 0;
int loopCount = 0;
for (int i = 0; i < 1000000; ++i)
{
callibration.Start();
callibration.Stop();
totalOverhead += callibration.Ticks;
loopCount++;
}
_overhead = totalOverhead / loopCount;
Console.WriteLine("Callibrating StopWatch: overhead {0}", _overhead);
}
public void Start()
{
QueryPerformanceCounter(out _startTime);
}
public void Stop()
{
QueryPerformanceCounter(out _stopTime);
}
public long Ticks
{
get { return _stopTime - _startTime - _overhead; }
}
public double Seconds
{
get { return (double)(_stopTime - _startTime - _overhead) / _frequency; }
}
public double Nanoseconds
{
get { return (double)1000000000 * (_stopTime - _startTime - _overhead) / _frequency; }
}
[DllImport("kernel32.dll")]
static extern bool QueryPerformanceCounter(out long val);
[DllImport("kernel32.dll")]
static extern bool QueryPerformanceFrequency(out long val);
}