bug#65837: 30.0.50; Debugger in non-main threads

[Helmut Eller]

On Sat, Sep 09 2023, Eli Zaretskii wrote:

> AFAIR, it is not trivial to improve
> the thread error handling significantly, but patches are welcome, of
> course.

Is there a design/plan for how recursive-edit is supposed to work in
non-main threads?

E.g. some options that come to mind:

1) It should be allowed without restriction (what currently seems to be
happening).

2) There should be some locking/multiplexing scheme so that only some
"foreground thread" is allowed to read events from the keyboard.

3) Only the main thread is allowed to call recursive-edit; all other
threads have to communicate with the main thread in some way.  (Maybe
there should be one thread per terminal that runs a command loop, but
that's an exotic detail.)

Helmut