using System;
using System.Runtime.InteropServices;
using System.ComponentModel;
using System.Threading;
namespace Win32
{
internal class HiPerfTimer
{
[DllImport("Kernel32.dll")]
private static extern bool QueryPerformanceCounter(
out long lpPerformanceCount);
[DllImport("Kernel32.dll")]
private static extern bool QueryPerformanceFrequency(
out long lpFrequency);
private long startTime, stopTime;
private long freq;
// Constructor
public HiPerfTimer()
{
startTime = 0;
stopTime = 0;
if (QueryPerformanceFrequency(out freq) == false)
{
// high-performance counter not supported
throw new Win32Exception();
}
}
// Start the timer
public void Start()
{
// lets do the waiting threads there work
Thread.Sleep(0);
QueryPerformanceCounter(out startTime);
}
// Stop the timer
public void Stop()
{
QueryPerformanceCounter(out stopTime);
}
// Returns the duration of the timer (in seconds)
public double Duration
{
get
{
return (double)(stopTime - startTime) / (double) freq;
}
}
}
}
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