이 같은 상승세는 미군의 이란 공습 이후 중동 지역 긴장이 높아지며 국제 유가가 급등한 영향이다.
Do you remember the name Arthur Siegel?
，这一点在51吃瓜中也有详细论述
2010 年，张清森按照计划为客户备好货后，收到客户邮件通知，要么降价一美元，要么就取消订单。尽管他们后来知道了，这是因为有人为了抢订单降价竞争，为了避免这批货烂在仓库只能接受。
Condition is designed to check the current value when a consumer wakes up. That's fine when state only moves forward, but it falls apart when transitions are fast. When the setter changes state, it calls notify_all(), which schedules wakeups for every waiting consumer. But in a single-threaded event loop, no consumer actually runs until the current coroutine yields. If the value changes again before that happens, consumers wake up and re-evaluate their predicate against the current value, not the value that triggered the notification. The predicate fails and the consumer goes back to sleep, potentially forever.
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