On Sat, Sep 02 2023, Stefan Kangas wrote:

> Did you get any further with this?

Well, a bit.  I'm currently using the attached patch and for testing the
attached shell script.  The patch is good enough to pass these tests.  I
don't know if it breaks something else.

I had to change maybe_reacquire_global_lock to make the tests pass.  The
idea behind maybe_reacquire_global_lock seems dubious: waiting for a
lock in a signal handler seems, well, problematic.

Anyway, the patch is work in progress and only useful to me.

(The patch also includes changes for Windows, but I only tested those
manually and under Wine.  For the Windows console version, C-g doesn't
interrupt condition-wait.  Ordinary endless loops don't seem be
interruptible there either.  So, maybe this is acceptable.)

Helmut