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The boost documentation says:
Returns:
false if the call is returning because the time specified by abs_time was reached, true otherwise.
But what is returned if there is a spurious wakeup?
If the condition variable could figure that it is a spurious wake-up there would be no need to return, would it?
You need to check if the data protected by the mutex and the condition variable has changed to detect a spurious wake-up. The condition variable can not do that for you.