Write a standard lock plus "double check" to create a critical section around a variable access.
写一个标准的lock，在访问变量的前后创建临界区，要有“双重检查”。
To ensure that you receive valid data, and don't write bad information to the XML, you access the parameters and set the ok variable accordingly.
要确保能够接收到有效的数据，并且避免将错误信息写入XML，我们可以访问其参数并相应地设置ok变量。
Name: string variable with read and write access.
名称：字符串变量可以读写访问。
Age: integer variable with read and write access.
年龄：整型变量可以读写访问。
Age: integer variable with read and write access.
年龄：整型变量可以读写访问。
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