Hi,
On Friday, 8 December 2006 12:21, Pavel Machek wrote:
> Hi!
>
> > > > > > ...after resume.
> > > > >
> > > > > This is because of how signal_wake_up() works, I think..
> > > > >
> > > > > > But I think it is right approach.
> > > >
> > > > Okay, with the appended patch applied everything seems to work and I
> > > > don't
> > > > see any undesirable side-effects.
> > >
> > > I promise to try it... tommorow. Looks very good to me.
> >
> > Unfortunately there's one problem with it.
>
> Well, IIRC it still had the 'bash reports vi stopped twice' problem.
It doesn't do that for me, but ...
> > To reproduce it I run "gdb /bin/cat", execute "run" in gdb and press ^Z
> > twice
> > to stop both processes. Next I suspend and resume and run "fg" to get the
> > gdb
> > back.and press "Enter" to get the prompt. Then, it turns out that the
> > terminal echo doesn't work and "Enter" doesn't make it go to the next line.
> > I can recover from this state by typing "fg+Enter" (with no echo) so that
> > /bin/cat gets the continuation signal and it restores the terminal settings,
> > apparently.
>
> I wonder if we should start a test suite ;-).
>
> > This means, however, that with this patch the behavior of a process (gdb)
> > after the resume may be different to its normal behavior, which is wrong.
>
> Yep.
>
> > With my original [1/2] this problem doesn't appear (ie. after the resume gdb
> > behaves normally). Thus I think that, although this patch is much more
> > elegant, my original [1/2] is a safer solution, because we can say exactly
> > what it does.
>
> Original 1/2 indeed is 'safer'... but it is also too ugly to live.
Well, I don't agree with that. :-)
> Getting this to work should not be that hard,
But it would involve messing up with the scheduler, no?
> and I'd prefer not to add more tricky code to already-tricky process.c.
>
> In the meantime, perhaps we want 2/2 merged? That one was
> safe&obvious.
Sort of. Except I still don't know which architectures are supposed to use
the freezer ...
Greetings,
Rafael
--
If you don't have the time to read,
you don't have the time or the tools to write.
- Stephen King
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