Re: Simulating a multithreaded Emacs with creative lisp..

[Richard Stallman]

    One of the major problems with Emacs is that it is not multithreaded.  If 
you
    call a synchronous function your entire Emacs is locked up until it 
finishes.

That is true.  It would be very useful to make Emacs multithreaded,
but it's a big job.  So we are waiting for someone to do it.

Using multiple separate processes is not likely to work.  The
communication would be too hard.  Using separate system-level threads
is not likely to work either, because Emacs has to allow thread-switching
only when it could safely call a Lisp program.