Linux是个和Unix相似、以内核为基础的、完全内存保护、多任务多进程的操作系统。Linux最初是在1991年由一名芬兰学生Linus Torvalds开发的-Linux and Unix is similar to kernel-based, full memory protection, multi-process multi-tasking operating system. Linux was first in 1991 by a Finnish student Linus Torva

信号量的使用主要是用来保护共享资源，使得资源在一个时刻只有一个进程（线程）所拥有。-Semaphore is mainly used to protect the use of shared resources, making the resource at a time only one process (thread) owned.

编写一个生产者－消费者程序组，支持多个生产者和消费者，生产者进程数为2， 消费者进程数为3。 生产者与消费者之间使用共享内存进行数据传递，并使用信号量对数据的内容进行保护。-Preparation of a producer- consumer program group, supports multiple producers and consumers, the the producer process for 2 Consumers number of processes.