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// Copyright (C) 2016 The Qt Company Ltd.
// Copyright (C) 2016 Olivier Goffart <ogoffart@woboq.com>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#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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