Category : Miscellaneous Language Source Code
Archive   : ADATUT12.ZIP
Filename : TASKING.DUM

with text_io, calendar; use text_io, calendar;
procedure tasking is
interval : constant duration := 5.0;
total_intervals : constant positive := 9;
start_time : constant time := clock;
quitting_time : constant time := start_time +
total_intervals*interval;
next_time : time := start_time;
task type tick is
entry make_noise;
entry shutdown;
end tick;
t : tick;
task body tick is
quit : boolean := false;
begin
while not quit loop
select
accept make_noise do
put_line("Tick!");
end make_noise;
or
accept shutdown;
quit := true;
end select;
end loop;
end tick;
begin
while next_time < quitting_time loop
t.make_noise;
next_time := next_time + interval;
delay next_time - clock; new_line;
end loop;
t.shutdown;
end tasking;