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#if MYSQL_6_10
// Copyright (c) 2009, 2019, Oracle and/or its affiliates. All rights reserved.
//
// MySQL Connector/NET is licensed under the terms of the GPLv2
// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, 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
// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
//
// 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
{
/// <summary>
/// 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.
/// </summary>
internal class LowResolutionStopwatch
{
long _startTime;
public static readonly long Frequency = 1000; // measure in milliseconds
public static readonly bool IsHighResolution = false;
public LowResolutionStopwatch()
{
ElapsedMilliseconds = 0;
}
public long ElapsedMilliseconds { get; private set; }
public void Start()
{
_startTime = Environment.TickCount;
}
public void Stop()
{
long now = Environment.TickCount;
long elapsed;
// Calculate time different, handle possible overflow
if (now < _startTime)
{
if (now < 0)
elapsed = 1 + ((long)Int32.MaxValue - _startTime) + (now - (long)Int32.MinValue);
else
elapsed = Int32.MaxValue - _startTime + now;
}
else
elapsed = now - _startTime;
ElapsedMilliseconds += elapsed;
}
public void Reset()
{
ElapsedMilliseconds = 0;
_startTime = 0;
}
public TimeSpan Elapsed => new TimeSpan(0, 0, 0, 0, (int)ElapsedMilliseconds);
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