This function exits a thread if the normal sequential execution hasn't finished.

如果正常的顺序执行尚未完成，这个函数将退出线程。

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For the first two choices, a single sequential execution path results, while the choice of Task 3 and Task 4 results in both branches executing in parallel.

对于前两个选择，将只导致一条后续执行路径，而同时选择Task 3和Task 4将导致并行执行这两个分支。

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This problem also highlights one of the fundamental design principles when it comes to working with parallel data structures: Do not assume sequential execution of any code, ever.

这个问题也突显了并发数据结构的基本设计原则之一：决不要假设任何代码会连续执行。

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The short time between thought and execution of an idea encouraged sequential picture-taking and self-portraiture of all kinds.

WSJ: The Polaroid SX-70 as Sexy Tech | Frances Lehman Loeb Art Center | By Richard B. Woodward