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/****************************************************************************
**
** Copyright (C) 2022 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.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
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**
**
**
******************************************************************************/
#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/qhash.h>
#include <QtCore/qwaitcondition.h>
QT_REQUIRE_CONFIG(thread);
QT_BEGIN_NAMESPACE
class QReadWriteLockPrivate
{
public:
explicit QReadWriteLockPrivate(bool isRecursive = false)
: recursive(isRecursive) {}
QMutex mutex;
QWaitCondition writerCond;
QWaitCondition readerCond;
int readerCount = 0;
int writerCount = 0;
int waitingReaders = 0;
int waitingWriters = 0;
const bool recursive;
//Called with the mutex locked
bool lockForWrite(int timeout);
bool lockForRead(int timeout);
void unlock();
//memory management
int id = 0;
void release();
static QReadWriteLockPrivate *allocate();
// Recusive mutex handling
Qt::HANDLE currentWriter = {};
QHash<Qt::HANDLE, int> currentReaders;
// called with the mutex unlocked
bool recursiveLockForWrite(int timeout);
bool recursiveLockForRead(int timeout);
void recursiveUnlock();
};
QT_END_NAMESPACE
#endif // QREADWRITELOCK_P_H
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