signal handling in sunview

[Marcus Gates]

I have a sunview application which is receiving "messages" using SIGUSR1
and have observed the following strange behavior.  I am calling
notify_set_signal_func() in order to trap signal SIGUSR1 Synchronously.
The signal handling routine starts-off by calling sigsetmask (0xffffffff)
to block all other signals temporarily.  After putting a print statement
in the handler and in another routine it calls, I seem to sometimes see
the called routine print statement twice and the handlers only once which
implies that despite blocking signals the routine is getting interrupted
and restarted.  Any ideas?
				Internet: marc at aplpy.jhuapl.edu