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LibreHardwareMonitor-0.9.4/Aga.Controls/TimeCounter.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Runtime.InteropServices;
+using System.Diagnostics.CodeAnalysis;
+
+namespace Aga.Controls
+{
+	/// <summary>
+	/// High resolution timer, used to test performance
+	/// </summary>
+	public static class TimeCounter
+	{
+		private static Int64 _start;
+
+		/// <summary>
+		/// Start time counting
+		/// </summary>
+		public static void Start()
+		{
+			_start = 0;
+			QueryPerformanceCounter(ref _start);
+		}
+
+		public static Int64 GetStartValue()
+		{
+			Int64 t = 0;
+			QueryPerformanceCounter(ref t);
+			return t;
+		}
+
+		/// <summary>
+		/// Finish time counting
+		/// </summary>
+		/// <returns>time in seconds elapsed from Start till Finish	</returns>
+		public static double Finish()
+		{
+			return Finish(_start);
+		}
+
+		public static double Finish(Int64 start)
+		{
+			Int64 finish = 0;
+			QueryPerformanceCounter(ref finish);
+
+			Int64 freq = 0;
+			QueryPerformanceFrequency(ref freq);
+			return (finish - start) / (double)freq;
+		}
+
+		[DllImport("Kernel32.dll")]
+		[return: MarshalAs(UnmanagedType.Bool)]
+		static extern bool QueryPerformanceCounter(ref Int64 performanceCount);
+
+		[DllImport("Kernel32.dll")]
+		[return: MarshalAs(UnmanagedType.Bool)]
+		static extern bool QueryPerformanceFrequency(ref Int64 frequency);
+	}
+}