Re: [Qemu-devel] [6391] Fix nographic mode and VNC

[Ian Jackson]

Paul Brook writes ("Re: [Qemu-devel] [6391] Fix nographic mode and VNC"):
> [Anthony:]
> > The third possibility is to have the select() run in a separate thread
> > from the TCG cpu_exec() loop.  cpu_exec() would do an atomic read of
> > 'event_pending' and the IO thread would do an atomic write of
> > 'event_pending' whenever select() returned a writable file descriptor.
>
> This suffers from the same problem described above. You need to
> force the main execution thread to break out of the translated
> loop. In practice this probably means sending a signal to the main
> thread.  You could check event_pending at the start of every TB, but
> that's likely to incur a fairly big performance hit.

What would the signal handler do ?  siglongjmp out of the translated
loop ?  Surely the timer implementation doesn't do that right now.

Ian.