Re: Timeouts in Ada

[AdaMagica <christ-usch.grein@t-online.de>]

On Thursday, July 24, 2014 5:37:39 PM UTC+2, Robert A Duff wrote:

> It makes perfect sense to enqueue on multiple entries.
> In fact, "select call_1 or delay..." enqueues twice (once on
> the entry call, and once on the timer queue).

That wasn't my point. I just indicated the model.

> Regarding your analogy: There's a supermarket near me where they have
> just one queue, and the person at the head of the queue takes the first
> available cash point.  In a sense, they're enqueued on multiple cash
> points.  ;-)  Like the multi-way call proposed (and rejected) for Ada 9X,
> they only use one.

That's a very sensible service - I often wish supermarkets here had this model. I find this only in airport counters.

But this is not the same as

>    select
>      call_1(params);
>    or
>      call_2(params);
>    or
>      delay 10;
>    end select;

In your supermarket, there is just one queue, and on the top, you are dispatched to a free cash point, and all of those do the same.

In that multiple select above, the different entries all would/could do different things. In your model: You queue before a gasoline station, a shoemaker, a hardware shop, an accomodation broker; you enter the first free of those.