nheko/include/RunGuard.h

#pragma once

//
// Taken from
// https://stackoverflow.com/questions/5006547/qt-best-practice-for-a-single-instance-app-protection
//

#include <QObject>
#include <QSharedMemory>
#include <QSystemSemaphore>

class RunGuard
{
public:
        RunGuard(const QString &key);
        ~RunGuard();

        bool isAnotherRunning();
        bool tryToRun();
        void release();

private:
        const QString key;
        const QString memLockKey;
        const QString sharedmemKey;

        QSharedMemory sharedMem;
        QSystemSemaphore memLock;

        Q_DISABLE_COPY(RunGuard)
};