Animation bug in SunView?

[William B. Thompson]

I have an animation program running under SunView (SunOS 4.0.3) that works
by using notify_set_itimer_func() to request that a rendering routing be
called at some specified interval.  Occasionally, the display freezes up.
CPU utilization is low, so I'm assuming that timer events have stop
occurring.  Moving the mouse or typing a character gets everything going
again.  Has anyone else seen this effect?  Is there a fix?

			William B. Thompson
			thompson at cs.umn.edu