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I have never personally found the need to implemented the Lua lock calls yet whilst looking through 5.1.4 the implementation of lua_xmove[1] caught my attention. The function would seem to indicate that lua_lock when used should be something like the following operating on a mutex stored in global_State, is this correct?

If this is not the case I would think lua_xmove would have problems for not locking 'from' when it's data maybe changed by another thread during the function call.