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The goal is to allow execution of one main lua state per thread. "state_from" is a pointer to the parent lua state. "state_id" is the index of the parent state id in the reference lua states array. "state_id" is better because the lock is a "== 0" test which is quick than pointer comparison. In other way, the state_id index could index other things the the Lua state concerned. I think to the function references.