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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.
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Erik Brynjolfsson has spent the last several years building one of the most detailed empirical pictures of how technology is reshaping the American workforce—and the picture keeps getting darker for workers at the bottom of the corporate ladder.
Фото: Abdelhadi Ramahi / Reuters