busy cycle
忙循环（Busy spin）：在等待的时候不断占用CPU，通常是因为采用了重复检查而不是适当的消息机制
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... 忙期||busy period 忙循环||busy cycle 矛盾||contradiction ...
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忙等待循环 busy wait loop
为了让线程等待，我们只需将线程执行一个忙循环(自旋)。
To wait all we do is put the thread into a busy loop (a spin).
youdao
人们常常将体能循环方面的这些改变归因于外部事件，诸如“我还没喝咖啡”或是“我在办公室忙了一整天。”
Often, these alterations in energy cycles are ascribed to external events: "I haven't had my coffee yet" or "I had a bear of a day at the office.
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