说明：   循环缓冲区是一个非常常用的数据存储结构，已经被广泛地用于连续、流数据的存储和通信应用中。对于循环缓冲区，传统的操作方法是开辟一块连续的存储区，不断地写入数据，当写入到存储区的末尾的时候，再从存储区的首部再开始写入数据，由此不断地重复下去构成了循环缓冲区。偶曾经写过很多循环缓冲区，也看过很多人编写的循环缓冲区，但是拜读Simon Cooke先生的文章────“两段式”循环缓冲区
(Cycle of the buffer zone is a very commonly used in data storage structure, has been widely used in continuous flow of data storage and communications applications. The cycle of the buffer zone, the traditional method of operation is a continuous open storage areas, continue to write data, when written to the storage area at the end of time, and then from the storage area of the first start to write data, thus continuously Repeat this constitutes a cycle of the buffer zone. Even wrote a lot of cycle of the buffer zone, but also a lot of people have seen the cycle of the preparation of the buffer zone, but read the article, Mr. Simon Cooke ─ ─ ─ ─ two-stage cycle of the buffer zone)