Add traffic control for socket

test/testsocket.lua

@@ -5,6 +5,7 @@ local mode , id = ...
 
 local function echo(id)
 	socket.start(id)
+	socket.write(id, "Hello Skynet\n")
 
 	while true do
 		local str = socket.read(id)
@@ -28,12 +29,7 @@ if mode == "agent" then
 	end)
 else
 	local function accept(id)
-		socket.start(id)
-		socket.write(id, "Hello Skynet\n")
 		skynet.newservice(SERVICE_NAME, "agent", id)
-		-- notice: Some data on this connection(id) may lost before new service start.
-		-- So, be careful when you want to use start / abandon / start .
-		socket.abandon(id)
 	end
 
 	skynet.start(function()