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From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Newsgroups: comp.lang.ada
Subject: Re: How do I get an enctry in a protected object to block until a
 certain item arrives from a producer task?
Date: Tue, 23 Aug 2016 13:02:28 -0700
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Date: 2016-08-23T13:02:28-07:00
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On 08/23/2016 12:26 PM, J-P. Rosen wrote:
> Le 23/08/2016 à 19:52, Egil H H a écrit :
>>
>> I just answered this on stackoverflow. If Command_Id_Type is a discrete type, what you need is an entry family (which is like an array of entries)
>> see the stackoverflow answer for an example
>>
> Or accept the entry, and if the proper data is not there, requeue.

This is called Preference Control, "where the ability to satisfy a request
depends on the parameters passed in". An example is given in AARM-95 9.2.1

http://www.adaic.org/resources/add_content/standards/95rat/rat95html/rat95-p2-9.html#2

-- 
Jeff Carter
"I've seen projects fail miserably for blindly
applying the Agile catechism: we're Agile, we
don't need to stop and think, we just go ahead
and code!"
Bertrand Meyer
150