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。
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Task3和Task4将导致并行执行这两个分支。
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。
This is called sequential execution and is the default direction of program flow.
这称为循序执行，也是程序流程的预设方向。
This is called sequential execution and is the default direction of program flow.
这称为循序执行，也是程序流程的预设方向。
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