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I now realize how silly my implementation is. It will never be called for existing global variables. It should be more like: __index=function(_,n) local env=threadEnvironments[coroutine.running()] -- a table that keeps custom environments for select threads return env and env[n] end From: lua-l-bounces@lists.lua.org [mailto:lua-l-bounces@lists.lua.org] On Behalf Of Ivo Beltchev Hi It looks to me from the documentation that environments are tied to a function. So any time a function is being called, it has access to that environment. Is it possible to associate an environment with a thread instead? So if a function is executed in that thread it will use the thread’s environment. Basically I’m trying to simulate TLS. I want any access to a TLS variable to use the local environment, but when accessing a global variable (a variable not in the current environment), I want to access the real global variable. One way I can do this manually is to manipulate the metatable of _G: __index=function(g,n) local env=threadEnvironments[coroutine.running()] -- a table that keeps custom environments for select threads if env and env[n] then return env[n] end return rawget(g,n) end and something similar for __newindex Is there something like that already built into the language? Ivo |