notify for first & last signal handler

[Stefan Kost <ensonic hora-obscura de>]

hi,

I would like to know when the first gets connected to my signal and  
when the last one disconnects. The signal is emmitted from a process  
that I don't want to run, if nobody listens. There is  
g_signal_has_handler_pending(), but I don't want to poll that. Anyone  
aware of a way to do it?

Stefan