* delay duration'last: problems?
@ 1994-10-16 16:03 Maarten Landzaat
1994-10-20 10:53 ` Mats Weber
0 siblings, 1 reply; 2+ messages in thread
From: Maarten Landzaat @ 1994-10-16 16:03 UTC (permalink / raw)
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!
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1994-10-16 16:03 delay duration'last: problems? Maarten Landzaat
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