说明：  完成端口被广泛的应用于各个高性能服务器程序上，例如著名的Apache….如果你想要编写的服务器端需要同时处理的并发客户端连接数量有数百上千个的话，那不用纠结了，就是它了。
(Completion ports are widely used in various high performance server programs, such as the famous Apache... If you want to write the server side needs to be handled simultaneously with the number of concurrent client connections hundreds of thousands of words, that do not have to tangle, and that is it.)