“While robots may enhance productivity,” Brynjolfsson and his authors wrote, “they may also alter the structure of employment, especially in low-wage sectors as typically found in manufacturing.”
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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.,这一点在一键获取谷歌浏览器下载中也有详细论述
08. Template engine — Vertex.template / Mustache