Re: ui/cocoa.m compile error (Cocoa -> SDL)

[Philippe Mathieu-Daudé]

+Markus/Daniel/Marc-Andre

On 17/1/22 17:07, Liviu Ionescu wrote:
> > On 17 Jan 2022, at 16:06, Peter Maydell <peter.maydell@linaro.org> wrote:
> >
> > This is newer versions of macOS being stricter about enforcing that
> > some operations are only permitted on the correct thread. Older versions
> > let QEMU/SDL get away with doing them on the "wrong" thread, which
> > all happened to work.
>
> Ah, right, I remember this gave me a lot of headaches when I added the animated 
> LEDs to qemu-system-gnuarmeclipse, and in the end I had to rewrite the SDL code 
> to guarantee that graphical updates happen only on the main thread.
>
> > It looks like it's "code would need to be updated to fix the
> > problems that newer macOS complains about", which nobody has done.
>
> Later this year I plan to add animated LEDs to qemu-system-arm too, so I might 
> face the same problems again.

Note, this topic has been discussed 2 years ago while I proposed an UI
visualizer:
https://wiki.qemu.org/Internships/ProjectIdeas/ArduinoVisualisation

The consensus was UI should not be addressed within QEMU itself, but
via an external helper, eventually using D-Bus. D-Bus support has been
recently merged:
https://www.qemu.org/docs/master/interop/dbus.html

> If you think useful, I can contribute the patches back to upstream.

All contributions are welcomed for review. Even if a contribution is
not merged right away, you can see the mailing list as an archive for
previous attemps, in case a contributor gets stuck or have to switch
to another project, someone else can restart / keep working on earlier
series.