说明：  设计了一个环形字节缓冲区类，可用于通信数据收发的缓冲处理。类的读写及查看接口已经加上了多线程同步访问锁。
(Designed a ring-byte buffer class, can be used to send and receive communication data buffering. Class to read and write and see the interface has been coupled with a multi-thread synchronization to access the lock.)