在通信程序中，经常使用环形缓冲区作为数据结构来存放通信中发送和接收的数据。环形缓冲区是一个先进先出的循环缓冲区，可以向通信程序提供对缓冲区的互斥访问-In the communications program, frequently used as a ring buffer data structure to store communications to send and receive data. FIFO ring buffer is a circular buffer, the communication program can provide mutually exclusive access to the buffer