进程间的生产者与消费者问题，2个生产者，3个消费者，缓冲区个数为3。通过信号量和互斥体对象实现了进程间的同步，通过文件映射实现了进程间的通信。-Producer and consumer issues between processes, two producers, three consumers, the number of buffers is 3. By semaphores and mutexes object implements synchronization, file mapp