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Loops that do nothing and don't terminate.

If your loop infinitely writes the number 70 to an atomic int, it's fine.

If by "nothing" you mean "nothing but looping", then yes, you are right. Any loop that "just loops" is doing something by definition: looping.

It depends on your perspective. Normally when I talk about what a loop "does", I am talking purely about the contents of the loop.