虚拟段包含关于线程和会话信息以及它们所使用的数据。
This segment contains information about the threads and sessions, and the data that is used by them.
关于线程的更多信息，请参考线程编程指南。
For more information on threading technologies, see threading Programming Guide.
关于线程最后值得一提的是：除非您的确需要，不要频繁休眠。
One last point worth mentioning about threads: don't busy sleep unless you absolutely must. Listing 8 shows an example of what not to do
应用推荐