"Ada as a second language" question

"Ada as a second language" question

[Darren New]

If you have this book and a few minutes, can you turn to page 879?

Therein you find a Load_Manager. The said Load_Manager demonstrates the
proper way to requeue an entry.

Unfortunately, it looks like if someone calls Set_Load while nothing
else is queued, and in particular while there's nothing queued on
Wait_To_Retry, then the whole system will block. Nothing's queued on the
private entry that opens the only public entry.

Am I missing something? Or is this an error in that code? Particularly
since a paragraph or two later the author says "As the example
illustrates, the 'Count attribute can be used in a barrier", except he
doesn't. 

TIA!

-- 
Darren New 
San Diego, CA, USA (PST). Cryptokeys on demand.
                   Who is this Dr. Ibid anyway, 
                  and how does he know so much?

Re: "Ada as a second language" question

[James Rogers]

Darren New wrote:
> 
> If you have this book and a few minutes, can you turn to page 879?
> 
> Therein you find a Load_Manager. The said Load_Manager demonstrates the
> proper way to requeue an entry.
> 
> Unfortunately, it looks like if someone calls Set_Load while nothing
> else is queued, and in particular while there's nothing queued on
> Wait_To_Retry, then the whole system will block. Nothing's queued on the
> private entry that opens the only public entry.
> 
> Am I missing something? Or is this an error in that code? Particularly
> since a paragraph or two later the author says "As the example
> illustrates, the 'Count attribute can be used in a barrier", except he
> doesn't.

You are correct. There is an error in that code. The error can be
fixed by changing Set_Load to an entry, using 'Count attribute for
the barrier condition.



Jim Rogers
Colorado Springs, Colorado USA

Re: "Ada as a second language" question

[J. David Bryan]

On Wed, 26 Sep 2001 22:47:49 GMT in article <3BB25B0A.1FEFFF71@san.rr.com>, 
Darren New wrote...
>
>
>Am I missing something? Or is this an error in that code?

See:

  http://www.research.ibm.com/people/n/ncohen/a3sl_errata.html

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                                        -- Dave Bryan
 
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Re: "Ada as a second language" question

[Darren New]

>   http://www.research.ibm.com/people/n/ncohen/a3sl_errata.html

Ah! Thank you! I thought it was me... :-)

 -- Still Learning.

-- 
Darren New 
San Diego, CA, USA (PST). Cryptokeys on demand.
                   Who is this Dr. Ibid anyway, 
                  and how does he know so much?