A pipe is composed of a queue and two file descriptors-one to enqueue data and the other to dequeue data.

管道由一个队列和两个文件描述符(一个用于数据入列，另一个用于数据出列)组成。

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The requester can choose to enqueue a request but not wait for processing to complete, then periodically check for a response in the response queue while it performs other work.

请求者可以选择为请求排队但是不等待处理的完成。当执行其他工作时，要定时检查响应队列中的响应。

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