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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Ada tasking question
Newsgroups: comp.lang.ada
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Date: Thu, 19 Apr 2007 09:49:14 +0200
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Date: 2007-04-19T09:49:14+02:00
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It makes no sense to finish a task after a bucket was processed. I would
propose an alternative design, where a task would ask the buckets
collection for a job to do. It would then process the bucket and ask for a
next one. When the collection responds: no more buckets, the task finishes:

type Bucket is new Ada.Finalization.[Limited_]Controlled ...
procedure Process (Job : in out Bucket);

type Bucket_List is record
   Buckets : Bucket_Array (...);
   Indexer : a protected object to index buckets concurrently
end record;

procedure Do_One (List : in out Bucket_List) is
begin
   Process (List.Buckets (List.Indexer.Get_Next));
      -- Get_Next raises exception No_Buckets,
      -- when the end of List.Buckets is reached
end Do_One;

task body Bucket_Worker is
begin
   loop
      Do_One (List);
   end loop;
exception
   when No_Buckets =>
      null;
end Bucket_Worker;

You start as many Bucket_Workers as you find appropriate.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de