This is a modify version of lua 5.3.2 (http://www.lua.org/ftp/lua-5.3.2.tar.gz) .

For detail ,
  Shared Proto : http://lua-users.org/lists/lua-l/2014-03/msg00489.html
  Shared short string table : http://blog.codingnow.com/2015/08/lua_vm_share_string.html
  Signal for debug use : http://blog.codingnow.com/2015/03/skynet_signal.html