This implementation is fine for a single-threaded program.
这个实现适合于单线程程序。
If this code were in a single-threaded program we'd expect the thread_function code to execute in its entirety.
如果代码是位于单线程程序中，可以预期thread_function代码将完整执行。
A thread is an encapsulation of the flow of control in a program. you might be used to writing single-threaded programs - that is, programs that only execute one path through their code "at a time".
线程是程序中的控制流程的封装。你可能已经习惯于写单线程程序，也就是，程序在它们的代码中一次只在一条路中执行。
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