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From: G.B. <nonlegitur@futureapps.invalid>
Newsgroups: comp.lang.ada
Subject: Re: How to: communication between multiple tasks using protected
 objects - with no polling?
Date: Thu, 22 Jan 2015 21:52:17 +0000 (UTC)
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Date: 2015-01-22T21:52:17+00:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote:
> On Wed, 21 Jan 2015 19:56:17 +0100, Jacob Sparre Andersen wrote:

>> To me it sounds like a single protected object for storing the state of
>> all the workers (students) makes most sense.  The workers can push in
>> their most recent state through a (common) protected procedure.  The
>> master (teacher) blocks on a protected entry until at least one worker
>> has updated its state.
> 
> Right, though this works only with a single subscriber (the teacher).
> Usually there are more than one .

The PO and the teacher task(s) could share a suspension
object (one for each teacher). When the PO has collected
enough items, it calls Set_True on some suspension
object to wake the teacher task up.