/****************************************************************************
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**
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** Copyright (C) 2021 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the Qt VS Tools.
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**
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** $QT_BEGIN_LICENSE:GPL-EXCEPT$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 as published by the Free Software
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** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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using System.Diagnostics;
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namespace QtVsTools
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{
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public class Timestamp : Concurrent<Timestamp>
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{
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long LastTimestamp { get; set; }
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long GetStrictMonotonicTimestamp()
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{
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lock (CriticalSection) {
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long t = Stopwatch.GetTimestamp();
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if (t <= LastTimestamp)
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t = LastTimestamp + 1;
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return (LastTimestamp = t);
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}
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}
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static Timestamp _Instance;
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static Timestamp Instance =>
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StaticThreadSafeInit(() => _Instance, () => _Instance = new Timestamp());
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public static long Next()
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{
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return Instance.GetStrictMonotonicTimestamp();
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}
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}
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}
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