Re: [Qemu-devel] Re: [PATCH] Fix freezing bug in curses console

[Jamie Lokier]

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