Subj : Re: Lock Free Programming with Boost::shared_ptr instead of Hazard   Pointers
To   : comp.programming.threads
From : Joe Seigh
Date : Mon Mar 21 2005 08:47 am

On Mon, 21 Mar 2005 14:20:17 +0100, Alexander Terekhov <terekhov@web.de> wrote:

>
> Joe Seigh wrote:
> [...]
>> > http://groups.google.de/groups?selm=3F1F26CC.4125AE8B%40web.de
>> >
>> What was the overhead that they think isn't there now?
>
> "Overhead-free" means that apart from destruction of last "strong"
> instance (which triggers destruction of managed object), existence of
> weak_ptr feature doesn't make operations on "strong" pointer instances
> more expensive or contentious then conventional refcounting pointers
> (using atomic lockless operations) without weak_ptr feature (space for
> extra count aside for a moment).
>
What, they didn't know you could do combine arithmetic operations on
adjacent counts with a single atomic operation?  You have an easy
audience there. :)

-- 
Joe Seigh

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