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On Fri, Dec 18, 2009 at 2:06 PM, Francesco Abbate <> wrote:
> I was thinking that it would be nice if the userdata could store one
> or more reference to other userdata objects in order to ensure that
> the GC does not free the main object that own the resource if other
> objects that need the same resource are still alive. In my idea the C
> API could be something like:

Use lua_setfenv() to attach a table to your userdata.

In that table, put a reference to the userdata you want to not be available
for garbage collection while this new userdata exists.