qtlockedfile.h

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// Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
// SPDX-License-Identifier: BSD-3-Clause
 
#ifndef QTLOCKEDFILE_H
#define QTLOCKEDFILE_H
 
#include <QFile>
#ifdef Q_OS_WIN
#include <QVector>
#endif
 
namespace QtLP_Private {
 
class QtLockedFile : public QFile
{
public:
    enum LockMode { NoLock = 0, ReadLock, WriteLock };
 
    QtLockedFile();
    QtLockedFile(const QString &name);
    ~QtLockedFile();
 
    bool open(OpenMode mode);
 
    bool lock(LockMode mode, bool block = true);
    bool unlock();
    bool isLocked() const;
    LockMode lockMode() const;
 
private:
#ifdef Q_OS_WIN
    Qt::HANDLE wmutex;
    Qt::HANDLE rmutex;
    QVector<Qt::HANDLE> rmutexes;
    QString mutexname;
 
    Qt::HANDLE getMutexHandle(int idx, bool doCreate);
    bool waitMutex(Qt::HANDLE mutex, bool doBlock);
 
#endif
    LockMode m_lock_mode;
};
}
#endif