[Vala] Singleton question

["José D. Abad" <granveoduendes gmail com>]

I used the singleton pattern. For now it has worked.
My question is: How can I make it//// thread-safe with Glib?
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using GLib;

public class CSingleton : Object
{
   private static CSingleton Instance = null;

   private static void CreateInstance ()
   {
       if (Instance == null)
       {
           Instance = new CSingleton ();
       }
   }

   public static CEscena Get_Instance ()
   {
       if (Instance == null) CreateInstance ();
       return Instance;
   }
}
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CSingleton singleton = Get_Instance ();

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