这个堆栈没有锁；这种无锁的并发数据结构也称为非阻塞数据结构。
No locks will be included; this kind of lock-free, concurrent data structure is also referred to as a non-blocking data structure.
从十月末开始，苹果公司开始将无锁的iPhone4S运往欧洲和亚洲的一些国家。
Starting in late October, Apple began shipping unlocked models to a number of European and Asian countries.
无优先级反转：高优先级的线程不会因中优先级线程正在运行，而被持有其所需锁的低优先级线程阻塞。
No priority inversions: High-priority threads cannot be blocked by low-priority threads holding locks they need because medium-priority threads are running.
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