An executable unit managed by an operating system scheduler.
由操作系统排程程序所管理的可执行单元。
Control is not passed to thread1, it's system scheduler who decides which thread to execute.
控制不传递给线程1，它是系统调度程序决定哪个线程执行。
A program executes when the system scheduler gives execution control to one of the program's threads.
程序会在系统排程器将执行控制提供给程序的其中一个执行绪时执行。
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