Re: [Qemu-devel] RFC: running the user interface in a thread ...

[Daniel P. Berrange]

On Tue, Jan 19, 2016 at 02:01:47PM +0100, Gerd Hoffmann wrote:
>   Hi,
> 
> > That, and so the UI can use localization without corrupting other
> > threads that MUST use the C locale (QMP parsing/output of floating point
> > is particularly important to get right with '.' instead of ',' for a
> > decimal separator).
> 
> A quick look at the setlocale manpage doesn't make clear whenever
> threads can have different locales or not.

glibc has per-thread locales, but this isn't guaranteed portable across
unix platforms. We could enable per-thread localization on Linux builds
but disable it on other platforms.

> Related:  Possibly we should move UIs to another *process* instead?
> At least the ones which use a UI toolkit (i.e. sdl, gtk, cocoa).

Is the worth the effort ? The majority of mgmt apps use spice/vnc which
is already out of process. Will the people do use SDL/GTK/Coca backends,
be doing so in a scenario where moving the UI to a separate process is
a benefit to them ?  I'm not saying we shouldn't separate the UI to
another process, just that we should consider whether there's other
things todo in QEMU UI layer that are a better payoff for the userbase.

Regards,
Daniel
-- 
|: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org              -o-             http://virt-manager.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org       -o-       http://live.gnome.org/gtk-vnc :|