linux串口、多线程、进程、网络相关内容，教学型代码及课件-linux serial port, multi-threaded, process, network-related content, teaching-based code and courseware

多线程之间通信实例。完成多线程之间如何通信的功能设计及具体流程操作。(Example of communication between threads. How to complete the communication between multi-threaded function design and specific process operations.)