但是，即使是不可取消的任务也应该尝试保留中断状态，以防在不可取消的任务结束之后，调用栈上更高层的代码需要对中断进行处理。

However, even noncancelable tasks should attempt to preserve the interrupted status in case code higher up on the call stack wants to act on the interruption after the noncancelable task completes.

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栈对超时的响应是把拥塞窗口重设回空状态。

The stack reacts to the timeout by resetting the congestion window back to an empty state.

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在这种情况下，栈中栈数据结构的状态类似于图4。

In such a case, the state of the stack of stacks data structure is similar to Figure 4.

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