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111 lines
3.2 KiB
C++
111 lines
3.2 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://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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** $QT_BEGIN_LICENSE:LGPL21$
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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 http://www.qt.io/terms-conditions. For further
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** information use the contact form at http://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 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** As a special exception, The Qt Company gives you certain additional
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** rights. These rights are described in The Qt Company LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QREFCOUNT_H
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#define QREFCOUNT_H
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#include <QtCore/qatomic.h>
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QT_BEGIN_NAMESPACE
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namespace QtPrivate
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{
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class RefCount
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{
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public:
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inline bool ref() Q_DECL_NOTHROW {
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int count = atomic.load();
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#if !defined(QT_NO_UNSHARABLE_CONTAINERS)
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if (count == 0) // !isSharable
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return false;
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#endif
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if (count != -1) // !isStatic
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atomic.ref();
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return true;
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}
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inline bool deref() Q_DECL_NOTHROW {
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int count = atomic.load();
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#if !defined(QT_NO_UNSHARABLE_CONTAINERS)
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if (count == 0) // !isSharable
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return false;
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#endif
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if (count == -1) // isStatic
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return true;
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return atomic.deref();
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}
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#if !defined(QT_NO_UNSHARABLE_CONTAINERS)
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bool setSharable(bool sharable) Q_DECL_NOTHROW
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{
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Q_ASSERT(!isShared());
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if (sharable)
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return atomic.testAndSetRelaxed(0, 1);
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else
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return atomic.testAndSetRelaxed(1, 0);
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}
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bool isSharable() const Q_DECL_NOTHROW
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{
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// Sharable === Shared ownership.
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return atomic.load() != 0;
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}
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#endif
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bool isStatic() const Q_DECL_NOTHROW
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{
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// Persistent object, never deleted
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return atomic.load() == -1;
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}
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bool isShared() const Q_DECL_NOTHROW
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{
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int count = atomic.load();
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return (count != 1) && (count != 0);
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}
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void initializeOwned() Q_DECL_NOTHROW { atomic.store(1); }
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void initializeUnsharable() Q_DECL_NOTHROW { atomic.store(0); }
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QBasicAtomicInt atomic;
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};
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}
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#define Q_REFCOUNT_INITIALIZE_STATIC { Q_BASIC_ATOMIC_INITIALIZER(-1) }
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QT_END_NAMESPACE
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#endif
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