堆栈的顶存储在result 中，使用CAS把top位置更新为 top->next并返回适当的数据。
The top of the stack is stored in result, and you use CAS to update the top location with top-<next and return the appropriate data.
堆栈的顶存储在result 中，使用CAS把top位置更新为 top->next并返回适当的数据。
The top of the stack is stored in result, and you use CAS to update the top location with top-<next and return the appropriate data.
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