On 24.02.2009, at 20:15, Matthew Fulmer wrote:
On Tue, Feb 24, 2009 at 06:21:10PM +0000, Zulq Alam wrote:
Hi Rob,
Rob Rothwell wrote:
Just wondering why, since Squeak has processes, when install
something
large via the Universe Browser, etc... I can't do anything else in
Squeak while it is installing? Is this by design?
It seems like it could just be a low priority background task and
you
could keep working...
I'm a Monticello developer. I think the lack of loading in the
background is mostly a historical accident, but it does prevent
some (but not all) problems where something gets modified
concurrently with the load.
Monticello 1.6 features true atomic loading, and thus could
support background compilation of the package while you continue
to work. It does the compilation in a sandbox separate from the
actual system, then merges it in using a single primitive
operation. For more details see
http://installer.pbwiki.com/SystemEditor
I haven't really thought about what would need to change in order
to support background loading; the biggest change would probably
be to stop the progress bar from appearing front and center on
the screen, and put it elsewhere.
One other issue is that before applying the atomic system change, you
need to verify the system is still in the same state as when the
working copy snapshot was taken. Monticello works by comparing a
snapshot of the package in the image with the package to be loaded,
taking the difference to patch the system. But if the part covered by
the snapshot is modified, the snapshot is invalid, and so the patch
becomes invalid too.
- Bert -
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