The entire Lua engine is in a single thread run by the renderer. While the coroutine library does offer thread-like functionality, it's not async. This means it blocks execution of the caller until it yields, pausing its own execution until it's called again.
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WoWInterface AddOns
"All I want is a pretty girl, a decent meal, and the right to shoot lightning at fools."
-Anders (Dragon Age: Origins - Awakening)
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