Re: Are there plans for a multi-threaded Emacs?

[Richard Stallman]

Dynamic binding causes no trouble for multiple threads if each thread has
its own binding stack and switching threads swaps the bindings.

However, code like

  (setq global-list (cons foo global-list))

is a completely separate issue.  The problem here is that thread
switching needs to be prevented between the access to global-list
and the modification of global-list.  Of course, the potential
for collision exists because global-list may be referred to elsewhere.
But it does not depend on dynamic bindings.  If nobody ever binds
global-list, if its global binding is the only one, the problem
still occurs.