116 lines
3.4 KiB
C++
116 lines
3.4 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 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 QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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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 Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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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 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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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-2.0.html and
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** 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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#ifndef QSEMAPHORE_H
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#define QSEMAPHORE_H
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#include <QtCore/qglobal.h>
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QT_REQUIRE_CONFIG(thread);
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QT_BEGIN_NAMESPACE
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class QSemaphorePrivate;
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class Q_CORE_EXPORT QSemaphore
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{
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public:
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explicit QSemaphore(int n = 0);
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~QSemaphore();
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void acquire(int n = 1);
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bool tryAcquire(int n = 1);
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bool tryAcquire(int n, int timeout);
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void release(int n = 1);
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int available() const;
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private:
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Q_DISABLE_COPY(QSemaphore)
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union {
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QSemaphorePrivate *d;
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QBasicAtomicInteger<quintptr> u;
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QBasicAtomicInteger<quint32> u32[2];
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QBasicAtomicInteger<quint64> u64;
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};
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};
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class QSemaphoreReleaser
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{
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public:
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QSemaphoreReleaser() = default;
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explicit QSemaphoreReleaser(QSemaphore &sem, int n = 1) noexcept
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: m_sem(&sem), m_n(n) {}
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explicit QSemaphoreReleaser(QSemaphore *sem, int n = 1) noexcept
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: m_sem(sem), m_n(n) {}
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QSemaphoreReleaser(QSemaphoreReleaser &&other) noexcept
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: m_sem(other.cancel()), m_n(other.m_n) {}
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QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_MOVE_AND_SWAP(QSemaphoreReleaser)
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~QSemaphoreReleaser()
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{
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if (m_sem)
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m_sem->release(m_n);
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}
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void swap(QSemaphoreReleaser &other) noexcept
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{
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qSwap(m_sem, other.m_sem);
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qSwap(m_n, other.m_n);
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}
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QSemaphore *semaphore() const noexcept
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{ return m_sem; }
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QSemaphore *cancel() noexcept
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{
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return qExchange(m_sem, nullptr);
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}
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private:
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QSemaphore *m_sem = nullptr;
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int m_n;
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};
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QT_END_NAMESPACE
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#endif // QSEMAPHORE_H
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