函数 start_kthread通过调用内核API kernel_thread 来启动这个线程。
The function start_kthread launches the thread by calling kernel API kernel_thread.
这包括发布对nonstatic内部类的引用，并一般要避免在构造函数中启动线程。
This includes publishing references to nonstatic inner classes, and generally precludes starting threads from within a constructor.
在stockquotegenerator类(一个单态类)的构造函数中，我们启动了一个新线程，并向该线程分配了一个Runnable对象。
In the constructor of StockQuoteGenerator class, which is a singleton class, we are starting a new thread and assigning a Runnable object to that thread.
获取操作系统调用的、启动此线程的函数的内存地址。
Gets the memory address of the function that the operating system called that started this thread.
只需两步即可以使线程运行：实现控制函数和启动线程。
Only two steps are required to get your thread running: implementing the controlling function and starting the thread.
只需两步即可以使线程运行：实现控制函数和启动线程。
Only two steps are required to get your thread running: implementing the controlling function and starting the thread.
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