How to run a single app instance in QT

Sometimes we don’t want to allow users to run multiple instances of the app at once. We might want to do it, to prevent memory leak, files corruption or we decided there is no practical need to run two instances of our app at once. As there is many ways of completing this task, there is many tricky use cases as well where the single instance lock may fall.

I will show couple of cases how to implement this kind of secure lock and will describe advantages and disadvantages of each method.

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