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Re: [Qemu-devel] Re: [PATCH] Fix freezing bug in curses console
From: |
Jamie Lokier |
Subject: |
Re: [Qemu-devel] Re: [PATCH] Fix freezing bug in curses console |
Date: |
Sat, 28 Feb 2009 21:21:16 +0000 |
User-agent: |
Mutt/1.5.13 (2006-08-11) |
Anthony Liguori wrote:
> >>It's racy with select(). A better fix would be to create a pipe and write
> >>to that pipe in the SIGWINCH handler. You should then register an io
> >>
> >
> >Maybe a bottom half would work? The scheduling of a bh shouldn't
> >constitute "real work".
>
> I think it still suffers from the same race condition so today it
> wouldn't work. You could fix the bottom half scheduling though so that
> you could safely schedule a bottom half from a signal handler (using
> roughly the same trick).
Fwiw, it's perfectly sensible to have a single pipe which is shared by
all signal handlers, just used to say "check for work flags set".
-- Jamie