RunGuard.h

/**
--------------------------------------------------------------------------------
-   Module      :   runGuard.h
-   Description :   This file for usage with QT makes sure only a single
-                   instance of the program is run.
-   Author      :   SaZ from Stackoverflow
-                   Tim Zaman, 18-FEB-2016
--------------------------------------------------------------------------------
*/

#ifndef RUNGUARD_H
#define RUNGUARD_H

#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 )
};


#endif // RUNGUARD_H