add gc service

service/garbagecollect.lua

@@ -0,0 +1,26 @@
+local skynet = require "skynet"
+local ssm = require "skynet.ssm"
+
+local function ssm_info()
+	return ssm.info()
+end
+
+local function collect()
+	local info = {}
+	while true do
+		while ssm.collect(false, info) do
+			skynet.error(string.format("Collect %d strings from %s", info.n, info.key))
+		end
+--		ssm.collect(true)
+		skynet.sleep(50)
+	end
+end
+
+skynet.start(function()
+	if ssm.disable then
+		skynet.error "Short String Map (SSM) Disabled"
+		skynet.exit()
+	end
+	skynet.info_func(ssm_info)
+	skynet.fork(collect)
+end)