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On Feb 25, 2010, at 8:30 PM, Roberto Ierusalimschy wrote:

> [...] what you want is
> that all functions being created in a library share a common upvalue
> (which happens to be a table). This is exactly the support you get from
> luaI_openlib. (Except for functions being created dynamically, which
> is not that common and can be done it manually.)

Yes. I have advocated, e.g., in Lua Gems, using LUA_ENVIRONINDEX for thread local storage in libraries. There's no reason a shared upvalue couldn't be used to do the same thing, and luaI_openlib would be a handy way to do it.

-- e