On Wednesday 28 May 2008 12:18:37 Damien Doligez wrote:
> On 2008-05-27, at 11:34, Martin Berger wrote:
> >>> Here I disagree. Shared  memory concurrency is a specific form
> >>> of message passing: Writing to a memory cell is in fact sending
> >>> a message to that cell carrying two items, the new value and a
> >>> return channel that is used to inform the writer that sending
> >>> has succeeded, and likewise for reading.
>
> [...]
>
> > But broadcasting is a form of message-passing too!
>
> That wasn't my point.  My point was that there is no return channel.
> If you want to know when your write is done, you have to use a lock
> or a memory barrier.  Both are very expensive.

Very expensive compared to what?

-- 
Dr Jon D Harrop, Flying Frog Consultancy Ltd.
http://www.ffconsultancy.com/products/?e