Introduction - If you have any usage issues, please Google them yourself
The current agreement has the following features: 1) customers to send the request to the server, each request for indefinite length. Request the length of the first INT specified .2) each server will normally provide services to a wide range of customers, for example, TS at the same time to the CP, NP to provide services, CP to the NP and other CP to provide services, at the same time or other CP, TS, SP customers .3) per server for the customer service usually is a long-term, will involve repeated requests- back and forth response. This structure is to be able to support a large number of concurrent client connections designed. in a large number of concurrent client connections, regardless of the thread or process can not be effective service, it is essential to adopt select polling方式.