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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2016 Olivier Goffart <ogoffart@woboq.com>
** 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 QREADWRITELOCK_P_H
#define QREADWRITELOCK_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of the implementation. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/private/qglobal_p.h>
#include <QtCore/private/qwaitcondition_p.h>
#include <QtCore/qvarlengtharray.h>
QT_REQUIRE_CONFIG(thread);
QT_BEGIN_NAMESPACE
class QReadWriteLockPrivate
{
public:
explicit QReadWriteLockPrivate(bool isRecursive = false)
: recursive(isRecursive) {}
QtPrivate::mutex mutex;
QtPrivate::condition_variable writerCond;
QtPrivate::condition_variable readerCond;
int readerCount = 0;
int writerCount = 0;
int waitingReaders = 0;
int waitingWriters = 0;
const bool recursive;
//Called with the mutex locked
bool lockForWrite(std::unique_lock<QtPrivate::mutex> &lock, int timeout);
bool lockForRead(std::unique_lock<QtPrivate::mutex> &lock, int timeout);
void unlock();
//memory management
int id = 0;
void release();
static QReadWriteLockPrivate *allocate();
// Recusive mutex handling
Qt::HANDLE currentWriter = {};
struct Reader {
Qt::HANDLE handle;
int recursionLevel;
};
QVarLengthArray<Reader, 16> currentReaders;
// called with the mutex unlocked
bool recursiveLockForWrite(int timeout);
bool recursiveLockForRead(int timeout);
void recursiveUnlock();
};
Q_DECLARE_TYPEINFO(QReadWriteLockPrivate::Reader, Q_PRIMITIVE_TYPE);
QT_END_NAMESPACE
#endif // QREADWRITELOCK_P_H
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