Hello, Yes, you are correct, I forgot all about that although I was thinking more of a platform-specific solution. Also the class is somewhat inconvenient as the behaviour is a bit different on Windows and *nix.
You could try some platform-specific code handling it (e.g. Windows does allow for global mutexes to be created through the win API), or using advisory file locking, which would be my choice. Also opening a local server socket the first time the application is started could be used to deduce whether the process is running if that suits you better. Perhaps QLockFile is a better option (http://doc.qt.io/qt-5/qlockfile.html) in this case? Kind regards.
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