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Фото: Chris Olszewski / Wikimedia
，这一点在PDF资料中也有详细论述
No polling, no wasted cycles. The handler blocks until the event fires. But Event is boolean: it's either set or unset. Our connection has five states, and drain_requests only cares about one of them. What happens when another handler needs to wait for connected? You need a second event. A third handler waiting for "not disconnected"? A third event with inverted logic. The setter has to know about all of them:
But this time the focus shifted. Last week Seoul's spy agency briefed lawmakers that it believes Kim has selected his daughter as his heir, and that she was seen giving her opinion on policy matters.