delay duration'last: problems?

[gijs@mbase97.xs4all.nl (Maarten Landzaat)]

Hi,

Our current project (DEC Ada on VAX/VMS) yielded a generic timer,
which does a "delay duration'last" when there's no work to do,
or when the callback is to be called a long time ahead in the future.

More of these timers run concurrently. Each timer is one task, with
a queue of wake-up times.

Now after those 36.4 (or something) hours, we get ACCess VIOlations.
A simple put_line after the delay is not executed.

Changing duration'last to 1 hour or 24 hours does NOT present these
problems. 

The delay is in a select statement like this:

select
	accept boo;
or	
	accept baa;
or
 	delay time_to_wait;
	do_callback;
	determine(time_to_wait);  -- if queue's empty: duration'last
end select;


Can anybody tell me why the access violations may occur?

Thanks very much!
-- 
Maarten Landzaat (gijs@mbase97.xs4all.nl)
Amsterdam, Double bass, Fender Jazz Bass, Atari ST, Roland Sound Canvas.
Listen to M-BASE music!