How to get to know when qtconcurrent actually run

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As mentioned in doc for QtConcurrent::run:

Note that the function may not run immediately; the function will only be run when a thread is available.

So here is a question: how to handle job running? QFutureWatcher signal start is not suitable because

This signal is emitted when this QFutureWatcher starts watching the future set with setFuture().

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