这样，即使线程b在线程A试图弹出数据的同时修改了堆栈顶，也可以确保不会跳过堆栈中的元素。
With this arrangement, even if Thread B has modified the top while Thread a tries to pop, you're sure that no elements in the stack are skipped.
这样，即使线程b在线程A试图弹出数据的同时修改了堆栈顶，也可以确保不会跳过堆栈中的元素。
With this arrangement, even if Thread B has modified the top while Thread a tries to pop, you're sure that no elements in the stack are skipped.
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