linux 环境下，socket通信线程-linux environment, socket communication thread

实现对指定IP地址的端口扫描，并为每个IP扫描开辟100个线程。已经过GDB调试，可支持1-5个IP的端口扫描-Specify the IP address of the port scanning, and open up to 100 threads for each IP scanning. Has been the GDB debugger can support the 1-5 IP port scan

TCP循环服务器一次只能处理一个客户端的请求.只有在这个客户的所有请求都满足后, 服务器才可以继续后面的请求.这样如果有一个客户端占住服务器不放时,其它的客户机 都不能工作了.因此,TCP服务器一般很少用循环服务器模型的.(The TCP loop server can only handle a request from one client at a time. Only after all the requests of this customer are satisfied, T