As I understand it such an implementation would not take advantage of
the new hardware that supports multi-threading, eg: multi-core x86
processors.
I am not sure that case is important, or that it would outweigh
the slowness of all variable accesses.
I don't think that Emacs will often have multiple threads actually
trying to run. If multiple users are typing on one Emacs, only
occasionally will they both run nontrivial commands at once.
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