What does boost::condition_variable::timed_wait() return on spurious wakeups?

Question

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?

Answer 1

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.