void notify_one() noexcept;
void notify_one() volatile noexcept;
Performs atomic notifying operations.
If there is a thread blocked in atomic waiting operation (i.e.
*this, then unblocks at least one such thread; otherwise does nothing.
This form of change-detection is often more efficient than simple polling or pure spinlocks.
| blocks the thread until notified and the atomic value changes
(public member function)
| blocks the thread until notified and the flag changes
| notifies a thread blocked in atomic_flag_wait
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