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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QSEMAPHORE_H
#define QSEMAPHORE_H
#include <QtCore/qglobal.h>
QT_REQUIRE_CONFIG(thread);
QT_BEGIN_NAMESPACE
class QSemaphorePrivate;
class Q_CORE_EXPORT QSemaphore
{
public:
explicit QSemaphore(int n = 0);
~QSemaphore();
void acquire(int n = 1);
bool tryAcquire(int n = 1);
bool tryAcquire(int n, int timeout);
void release(int n = 1);
int available() const;
private:
Q_DISABLE_COPY(QSemaphore)
union {
QSemaphorePrivate *d;
QBasicAtomicInteger<quintptr> u; // ### Qt6: make 64-bit
};
};
class QSemaphoreReleaser
{
public:
QSemaphoreReleaser() = default;
explicit QSemaphoreReleaser(QSemaphore &sem, int n = 1) Q_DECL_NOTHROW
: m_sem(&sem), m_n(n) {}
explicit QSemaphoreReleaser(QSemaphore *sem, int n = 1) Q_DECL_NOTHROW
: m_sem(sem), m_n(n) {}
QSemaphoreReleaser(QSemaphoreReleaser &&other) Q_DECL_NOTHROW
: m_sem(other.m_sem), m_n(other.m_n)
{ other.m_sem = nullptr; }
QSemaphoreReleaser &operator=(QSemaphoreReleaser &&other) Q_DECL_NOTHROW
{ QSemaphoreReleaser moved(std::move(other)); swap(moved); return *this; }
~QSemaphoreReleaser()
{
if (m_sem)
m_sem->release(m_n);
}
void swap(QSemaphoreReleaser &other) Q_DECL_NOTHROW
{
qSwap(m_sem, other.m_sem);
qSwap(m_n, other.m_n);
}
QSemaphore *semaphore() const Q_DECL_NOTHROW
{ return m_sem; }
QSemaphore *cancel() Q_DECL_NOTHROW
{
QSemaphore *old = m_sem;
m_sem = nullptr;
return old;
}
private:
QSemaphore *m_sem = nullptr;
int m_n;
};
QT_END_NAMESPACE
#endif // QSEMAPHORE_H
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