Subj : Re: A question about atomic_ptr
To   : comp.programming.threads
From : Peter Dimov
Date : Mon Apr 11 2005 01:53 pm

Chris Thomasson wrote:
> local_ptr<X> = shared_ptr<X>
> -------------------------------
> atomic_inc_acquire( &shared_ptr<X>::refs );
> local_ptr<X>::refs = 1;
>
>
> local_ptr<X> = 0
> -------------------------------
> --local_ptr<X>::refs
> if ( ! local_ptr<X>::refs )
> {
>  if ( ! atomic_dec_acquire( &shared_ptr<X>::refs ) )
>  {
>    // whatever
>  }
> }

Yes, exactly, but why acquire in the increment? Won't the usual release on 
nonzero/acquire on zero decrement do?

.