Handling Unix signals?

[Toralf Lund <toralf procaptura com>]

I think this question has been asked before, but I couldn't find any 
references to a solution:
How do I handle Unix signals in a Gtkmm application? I mean, when I want 
the (Unix, not Gtk) signal handler to do operations on the GUI? Simply 
calling gtk(mm) methods from a handler installed using signal() or 
sigaction() is dangerous, as far as I can tell, as you never know what 
the Gtk code was doing when the signal occurred, and it could be in a 
state where another Gtk or X call would be a bad thing.
Differently put, I'm looking for the Gtk+ or Gtkmm equivalent to 
XtNoticeSignal(). Is there one? Actually, some sort of a delayed signal 
emit would probably do the trick, but I can't find a way to do that.
- Toralf