Restart Go's net/http server on file-change like Django

I'm trying out Martini, which adds some nice functionality upon Go's basic `net/http` package. I was wondering tho. How can I, like Django does too, let the server restart itself on source-file changes? I know how to monitor a file, but I'm not sure how to retrigger the Server within the same process. I'm guessing to trigger `http.ListenAndServe` again, but I have a feeling it doesn't go well with instance already running. Do I need to spawn a subprocess/daemon to get this working?