http://wiki.jikexueyuan.com/project/lua/coroutines.html http://blog.csdn.net/wzzfeitian/article/details/8832017 https://www.ptt.cc/bbs/mud_sanc/M.1371321418.A.995.html

http://yume190.github.io/2016/11/17/lua/ http://w3.impa.br/~diego/software/luasocket/installation.html http://stackoverflow.com/questions/28105571/luasocket-udp-not-receiving-datagrams http://www.dcc.ufrj.br/~fabiom/lua/ http://cloudwu.github.io/lua53doc/manual.html http://www.runoob.com/lua/lua-environment.html http://w3.impa.br/~diego/software/luasocket/udp.html