* ada.synchronous_barriers incomplete?
@ 2018-05-01 11:26 hnptz
2018-05-01 12:34 ` Dmitry A. Kazakov
0 siblings, 1 reply; 2+ messages in thread
From: hnptz @ 2018-05-01 11:26 UTC (permalink / raw)
The rationale_2102 says: "There are many situations where the release of N tasks is required to execute an algorithm in parallel". My question is how to stop N-1 tasks after one of the N tasks has found the required solution before all other N-1 taks?
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* Re: ada.synchronous_barriers incomplete?
2018-05-01 11:26 ada.synchronous_barriers incomplete? hnptz
@ 2018-05-01 12:34 ` Dmitry A. Kazakov
0 siblings, 0 replies; 2+ messages in thread
From: Dmitry A. Kazakov @ 2018-05-01 12:34 UTC (permalink / raw)
On 2018-05-01 13:26, hnptz@yahoo.de wrote:
> The rationale_2102 says: "There are many situations where the release of N tasks is required to execute an algorithm in parallel". My question is how to stop N-1 tasks after one of the N tasks has found the required solution before all other N-1 taks?
An atomic Boolean set true by the first task reaching the solution?
Other task can periodically check the value.
Or it could be the asynchronous transfer of control if the tasks do only
computations:
task body Worker is
begin
select
Ready.Wait; -- Protected object implementation of an event
then abort
loop -- Incredibly long computations
...
exit when Converged;
...
end loop;
Ready.Signal; -- I am the first!
end select;
end Worker;
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
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