Subj : Re: Lock Free Programming with Boost::shared_ptr instead of Hazard
To   : comp.programming.threads
From : Alexander Terekhov
Date : Mon Mar 21 2005 02:20 pm


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).

regards,
alexander.

.