move skynet.memlimit from skynet.manager to skynet

lualib/skynet.lua

@@ -656,6 +656,11 @@ function skynet.term(service)
 	return _error_dispatch(0, service)
 end
 
+function skynet.memlimit(bytes)
+	debug.getregistry().memlimit = bytes
+	skynet.memlimit = nil	-- set only once
+end
+
 local function clear_pool()
 	coroutine_pool = {}
 end

lualib/skynet/manager.lua

@@ -20,10 +20,6 @@ function skynet.abort()
 	c.command("ABORT")
 end
 
-function skynet.memlimit(bytes)
-	debug.getregistry().memlimit = bytes
-end
-
 local function globalname(name, handle)
 	local c = string.sub(name,1,1)
 	assert(c ~= ':')

service-src/service_snlua.c

@@ -121,6 +121,8 @@ init_cb(struct snlua *l, struct skynet_context *ctx, const char * args, size_t s
 		size_t limit = lua_tointeger(L, -1);
 		l->mem_limit = limit;
 		skynet_error(ctx, "Set memory limit to %.2f M", (float)limit / (1024 * 1024));
+		lua_pushnil(L);
+		lua_setfield(L, LUA_REGISTRYINDEX, "memlimit");
 	}
 	lua_pop(L, 1);
 

test/testmemlimit.lua

@@ -1,5 +1,4 @@
 local skynet = require "skynet"
-require "skynet.manager"
 
 -- set sandbox memory limit to 1M, must set here (at start, out of skynet.start)
 skynet.memlimit(1 * 1024 * 1024)