HiPerfTimer.cs
|
namespace GenXdev.Additional.HiPerfTimer
{ public class NativeMethods { [System.Runtime.InteropServices.DllImport("Kernel32.dll")] [System.Security.SuppressUnmanagedCodeSecurity()] private static extern bool QueryPerformanceCounter(out long lpPerformanceCount); [System.Runtime.InteropServices.DllImport("Kernel32.dll")] [System.Security.SuppressUnmanagedCodeSecurity()] private static extern bool QueryPerformanceFrequency(out long lpFrequency); private long startTime; private long stopTime; public bool stopped = true; private long freq; public NativeMethods(bool StartNow = false) { Interlocked.Exchange(ref startTime, 0); Interlocked.Exchange(ref stopTime, 0); freq = 0; if (QueryPerformanceFrequency(out freq) == false) { throw new Exception("Timer not supported"); } if (StartNow) Start(); } /// <summary> /// Start the timer /// </summary> /// <returns>long - tick count</returns> public long Start() { stopped = false; //startTime2 = DateTime.Now; QueryPerformanceCounter(out long startTimeTmp); Interlocked.Exchange(ref startTime, startTimeTmp); return startTimeTmp; } /// <summary> /// Stop timer /// </summary> /// <returns>long - tick count</returns> public long Stop() { stopped = true; //stopTime2 = DateTime.Now; QueryPerformanceCounter(out long stopTimeTmp); Interlocked.Exchange(ref stopTime, stopTimeTmp); return stopTimeTmp; } /// <summary> /// Return the duration of the timer (in seconds) /// </summary> /// <returns>double - duration</returns> public double Duration { get { if (stopped) { return Convert.ToDouble(Interlocked.Read(ref stopTime) - Interlocked.Read(ref startTime)) / freq; } QueryPerformanceCounter(out long now); return Convert.ToDouble(now - Interlocked.Read(ref startTime)) / freq; } } /// <summary> /// Frequency of timer (no counts in one second on this machine) /// </summary> ///<returns>long - Frequency</returns> public long Frequency { get { return freq; } } public void Reset() { QueryPerformanceCounter(out long now); Interlocked.Exchange(ref startTime, now); } } } |