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91 lines
2.8 KiB
91 lines
2.8 KiB
// Copyright (c) 2009 Sun Microsystems, Inc.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License version 2 as published by
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// the Free Software Foundation
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//
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// There are special exceptions to the terms and conditions of the GPL
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// as it is applied to this software. View the full text of the
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// exception in file EXCEPTIONS in the directory of this software
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// distribution.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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using System;
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namespace MySql.Data.Common
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{
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/// <summary>
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/// This class is modeled after .NET Stopwatch. It provides better
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/// performance (no system calls).It is however less precise than
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/// .NET Stopwatch, measuring in milliseconds. It is adequate to use
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/// when high-precision is not required (e.g for measuring IO timeouts),
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/// but not for other tasks.
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/// </summary>
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class LowResolutionStopwatch
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{
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long millis;
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long startTime;
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public static readonly long Frequency = 1000; // measure in milliseconds
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public static readonly bool isHighResolution = false;
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public LowResolutionStopwatch()
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{
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millis = 0;
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}
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public long ElapsedMilliseconds
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{
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get { return millis; }
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}
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public void Start()
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{
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startTime = Environment.TickCount;
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}
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public void Stop()
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{
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long now = Environment.TickCount;
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// Calculate time different, handle possible overflow
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long elapsed = (now < startTime)?Int32.MaxValue - startTime + now : now - startTime;
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millis += elapsed;
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}
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public void Reset()
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{
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millis = 0;
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startTime = 0;
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}
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public TimeSpan Elapsed
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{
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get
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{
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return new TimeSpan(0, 0, 0, 0, (int)millis);
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}
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}
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public static LowResolutionStopwatch StartNew()
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{
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LowResolutionStopwatch sw = new LowResolutionStopwatch();
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sw.Start();
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return sw;
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}
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public static long GetTimestamp()
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{
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return Environment.TickCount;
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}
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bool IsRunning()
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{
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return (startTime != 0);
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}
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}
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}
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