同步与互斥 ，还有显示当前线程，司机售票员的pv，还有售票员买票-Synchronization and mutual exclusion, but also shows the current thread, the driver conductor of pv, also buy a ticket conductor

火牛开发板RT-Thread操作系统实例，花几百大洋买的，现在贡献出来供初学者学习-AC adapter development board RT-Thread operating system instance, spend a few hundred to buy the ocean, and now contribute to it for beginners to learn

用于做机器视觉的，来自px4的源码,http://www.amobbs.com/thread-5525773-1-1.html-the code from px4 PX4Flow is an optical flow camera. Provides optical flow at 250 Hz. Unlike mouse sensors it works indoors without illumination LED. Details. ■168 MHz Cortex M4F

该程序通过创建线程，利用线程之间的并发执行，来模拟火车站的两个窗口买票的场景。-The program by creating a thread, use of concurrent threads of execution between two windows to simulate the train station to buy tickets scene.