linux下c语言循环队列中，进行入队出队时把数据放进循环队列缓冲区进行读写操作。可以判断队列状态：满、空、运行正确、运行错误 。属于比较经典的例子-Cyclic queue, under Linux c team when the team put the data into the circular queue buffer to read and write operations. To judge the queue status: full, empty, correct operation and operation error. Belong to the more classic example