Re: multi-threaded Emacs

[Richard M Stallman]

      If an Elisp primitive is
    waiting for some data from a file or a socket, Emacs will hang until it
    is ready.

This is a real issue, but the solution is so easy
that it is not a real problem.

Activies that can wait a long time
use wait_reading_process_output
which already implements some parallelism.
Naturally we would arrange to enable thread-switching there.

    IMHO, concurrent threads itself are not very useful, they can be useful
    if considered a first step in the direction of a real parallelism.

If "concurrent threads" means "threads that can only switch where the
program lets them", they are very useful in Emacs for the sake of multiple
terminals.