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99 lines
3.1 KiB
99 lines
3.1 KiB
#if MYSQL_6_10
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// Copyright (c) 2009, 2019, Oracle and/or its affiliates. All rights reserved.
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//
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// MySQL Connector/NET is licensed under the terms of the GPLv2
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// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
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// MySQL Connectors. There are special exceptions to the terms and
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// conditions of the GPLv2 as it is applied to this software, see the
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// FLOSS License Exception
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// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
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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 as published
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// by the Free Software Foundation; version 2 of the License.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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using System;
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namespace Externals.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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internal class LowResolutionStopwatch
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{
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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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ElapsedMilliseconds = 0;
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}
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public long ElapsedMilliseconds { get; private set; }
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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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long elapsed;
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// Calculate time different, handle possible overflow
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if (now < _startTime)
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{
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if (now < 0)
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elapsed = 1 + ((long)Int32.MaxValue - _startTime) + (now - (long)Int32.MinValue);
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else
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elapsed = Int32.MaxValue - _startTime + now;
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}
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else
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elapsed = now - _startTime;
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ElapsedMilliseconds += elapsed;
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}
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public void Reset()
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{
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ElapsedMilliseconds = 0;
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_startTime = 0;
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}
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public TimeSpan Elapsed => new TimeSpan(0, 0, 0, 0, (int)ElapsedMilliseconds);
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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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#endif
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