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Doug Currie wrote:
> An approach that might work is to create a per-thread table for thread
> local storage and put it in the registry keyed on the thread's
> identity (i.e., L). This would work until some other library tried to
> put something else in the registry keyed on L. I could construct a
> "more unique key" such as L concatenated with the address of some
> object in my library, but this either runs the risk of running out of
> bits in LUA_NUMBER, or taking lots of time in re-constructing the key
> every time the context is needed.

Module private registries are easy:

    #define MY_REGISTRY lua_upvalueindex(1)

and then make sure that you put the registry table into the first
upvalue of each function of your module.

Ciao, ET.