Re: Pointers explained?

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

On Tue, 31 Jul 2007 18:21:30 +0100, Simon Wright wrote:

> I don't believe you can have a queue of messages like this without
> 'new'. If you just want to handle the messages in the context where
> they're created, you may be able to swing it.

Not necessary. There exist important cases:

1. When messages handling is synchronous, i.e. when the publisher waits for
message processing completion, then no heap is needed. It is just Ada's
rendezvous model. 

2. When the number of messages of same type is limited. That is when you
want to ensure QoS. Then you would probably block at emission point until
a pending message of same type is underway or else coalesce when processing
is not yet started. Otherwise you could quickly chock the system.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de