add stm object support. (STM : Software transactional memory)

test/teststm.lua

@@ -0,0 +1,36 @@
+local skynet = require "skynet"
+local stm = require "stm"
+
+local mode = ...
+
+if mode == "slave" then
+
+skynet.start(function()
+	skynet.dispatch("lua", function (_,_, obj)
+		local obj = stm.newcopy(obj)
+		print("read:", obj(skynet.unpack))
+		skynet.ret()
+		skynet.error("sleep and read")
+		for i=1,10 do
+			skynet.sleep(10)
+			print("read:", obj(skynet.unpack))
+		end
+		skynet.exit()
+	end)
+end)
+
+else
+
+skynet.start(function()
+	local slave = skynet.newservice(SERVICE_NAME, "slave")
+	local obj = stm.new(skynet.pack(1,2,3,4,5))
+	local copy = stm.copy(obj)
+	skynet.call(slave, "lua", copy)
+	for i=1,5 do
+		skynet.sleep(20)
+		print("write", i)
+		obj(skynet.pack("hello world", i))
+	end
+ 	skynet.exit()
+end)
+end