MI3 and async notifications

Jonah Graham jonah@kichwacoders.com
Mon Jun 17 21:50:00 GMT 2019


On Mon, 17 Jun 2019 at 16:58, Jan Vrany <jan.vrany@fit.cvut.cz> wrote:

> On Mon, 2019-06-17 at 16:45 -0400, Joel Brobecker wrote:
> > > > Jonah, I was about to ask the same. I understand that you need to
> know
> > > > which breakpoint has been inserted by given command, but this
> > > > if we respond with something like
> > > >
> > > > 1-break-insert main
> > > > =breakpoint-created,bkpt={number="1",type=...}
> > > > 1^done,bkpt-number=1
> > > >
> > > > then you just search for breakpoint with that id, no? Given that MI
> > > > guarantees that =breakpoint-created arrives before ^done reply to
> command.
> > > > Am I missing something?
> > > >
> > >
> > > No you aren't missing anything. That would be a perfectly acceptable
> > > solution for CDT.
> > >
> > > There would still be some other new logic needed for CDT, we would
> > > still have to store all the =breakpoint-created if there is a
> > > -break-insert active and then process all of them when the ^done is
> > > received. However that seems fairly reasonable.
> >
> > Do we even need the bkpt-number=1 attribute in the "done" command?
> > The notification includes that information, so the GUI should have
> > enough info from there to determine which UI element to update, right?
> >
>
> I think so. Imagine you have a UI with breakpoint list and there's
> an "Add Breakpoint" button. When "Add Breakpoint" is pressed, user
> fills location, press "OK", new breakpoint is added and
> *UI pre-selects just added breakpoint*. This is IMO sensible UI behavior.
>
> Now, when you press "OK" to add the breakpoint on a location, behind the
> scenes
> frontend issues -break-insert command and waits for ^done confirmation.
> But as Jonah mentioned, another breakpoint could be inserted meanwhile so
> you'd get something like this on MI channel.
>
> 10-break-insert main
> =breakpoint-created,bkpt={number="1",type=...<some unrelated breakpoint
> from CLI or script>}
> =breakpoint-created,bkpt={number="2",type=...<the breakpoint on main you
> just requested>}
> =breakpoint-created,bkpt={number="3",type=...<some unrelated breakpoint
> from CLI or script>}
> 10^done
>
> Now, if ^done response would not contain bkpt-number=2 attribute, how
> would you know which
> is the breakpoint you need to pre-select in the UI?
>
>
>
Thanks Jan, that looks like a good example to show the problem.



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