#if NET40 || NET461 // Copyright (c) 2009 Sun Microsystems, Inc. // // MySQL Connector/NET is licensed under the terms of the GPLv2 // , like most // MySQL Connectors. There are special exceptions to the terms and // conditions of the GPLv2 as it is applied to this software, see the // FLOSS License Exception // . // // This program is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published // by the Free Software Foundation; version 2 of the License. // // This program is distributed in the hope that it will be useful, but // WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY // or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License // for more details. // // You should have received a copy of the GNU General Public License along // with this program; if not, write to the Free Software Foundation, Inc., // 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA using System; namespace Externals.MySql.Data.Common { /// /// This class is modeled after .NET Stopwatch. It provides better /// performance (no system calls).It is however less precise than /// .NET Stopwatch, measuring in milliseconds. It is adequate to use /// when high-precision is not required (e.g for measuring IO timeouts), /// but not for other tasks. /// class LowResolutionStopwatch { long millis; long startTime; public static readonly long Frequency = 1000; // measure in milliseconds public static readonly bool isHighResolution = false; public LowResolutionStopwatch() { millis = 0; } public long ElapsedMilliseconds { get { return millis; } } public void Start() { startTime = Environment.TickCount; } public void Stop() { long now = Environment.TickCount; // Calculate time different, handle possible overflow long elapsed = (now < startTime) ? Int32.MaxValue - startTime + now : now - startTime; millis += elapsed; } public void Reset() { millis = 0; startTime = 0; } public TimeSpan Elapsed { get { return new TimeSpan(0, 0, 0, 0, (int)millis); } } public static LowResolutionStopwatch StartNew() { LowResolutionStopwatch sw = new LowResolutionStopwatch(); sw.Start(); return sw; } public static long GetTimestamp() { return Environment.TickCount; } bool IsRunning() { return (startTime != 0); } } } #endif