Like many queue algorithms, an empty queue consists of a single dummy node.
像许多队列算法一样，空队列只包含一个假节点。
Instead of throwing an exception when the queue is empty, the reader thread now blocks itself on the condition variable.
当队列是空的时候，读线程现在并不抛出异常，而是在条件变量上阻塞自身。
A woman holds onto an empty water container as residents queue for supplies at a shop in the coastal town of Mito, March 12, 2011.
2011年3月12日，水户的沿海镇内，一妇女手持空水盒，在一商店前的居民长队中等待补给。
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