clusterd support send

lualib/skynet.lua

@@ -161,6 +161,9 @@ function suspend(co, result, command, param, size)
 		sleep_session[co] = param
 	elseif command == "RETURN" then
 		local co_session = session_coroutine_id[co]
+		if co_session == 0 then
+			return suspend(co, coroutine_resume(co, false))	-- send don't need ret
+		end
 		local co_address = session_coroutine_address[co]
 		if param == nil or session_response[co] then
 			error(debug.traceback(co))