runguard.h

/*
 *openPilotLog - A FOSS Pilot Logbook Application
 *Copyright (C) 2020-2022 Felix Turowsky
 *
 *This program is free software: you can redistribute it and/or modify
 *it under the terms of the GNU General Public License as published by
 *the Free Software Foundation, either version 3 of the License, or
 *(at your option) any later version.
 *
 *This program is distributed in the hope that it will be useful,
 *but WITHOUT ANY WARRANTY; without even the implied warranty of
 *MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *GNU General Public License for more details.
 *
 *You should have received a copy of the GNU General Public License
 *along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
#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