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From: "Phil Slater" <phil.slater@baesystems.com>
Newsgroups: comp.lang.ada
References: <461cc46d$1_1@glkas0286.greenlnk.net>
 <ilkp139uool31fc8opd7b94jpmctvndeg3@4ax.com>
Subject: Re: Impossible problem? A protected buffer to queue objects of a
 class-wide type
Date: Wed, 11 Apr 2007 14:02:09 +0100
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Date: 2007-04-11T14:02:09+01:00
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"Rob Norris" <firstname.lastname@baesystems.com> wrote in message 
news:ilkp139uool31fc8opd7b94jpmctvndeg3@4ax.com...
> >
>>(b) To support this call, Dequeue must be written as a function. As such, 
>>it
>>cannot change the protected queue. What I need is the "entry" 
>>functionality,
>>since I want the Dequeue to wait if the queue is empty, and I want the 
>>item
>>to be removed from the queue as well as retrieved.
>
> Quick thought:
> Is it possible to pass into the function a reference to the queue?
> Then you should be able change the content of the queue as you see fit.
>

Maybe I didn't make myself clear. The queue is a protected object. None of 
the three types of protected operation (functions, procedures and entries), 
does what I need. I need the barrier/blocking of an entry, I need write 
access to change the protected data (the queue), but I also need the 
operation to *return* a value (like a function does) so that it can be 
received in calling code by using it to initialise a newly declared variable 
of a class-wide type.