Subj : Re: A question about atomic_ptr
To   : comp.programming.threads
From : Alexander Terekhov
Date : Mon Apr 18 2005 12:13 am


Peter Dimov wrote:
> 
> Peter Dimov wrote:
> > shared_ptr<T> * ppt;
> >
> > shared_ptr<T> reader()
> > {
> >    return *atomic_load_ddacq( ppt );
> 
> Except that I now need a hazard here...

And ddacq + ccacq (dependencies "independent" plain acq aside for 
moment) on slfence'd validation load-and-check. First load can be 
naked.

   p = shared.load(msync::naked_competing);
   do {
     hazard_register(0, p);
     // implied msync::slfence with p passed by reference below
   } while (!shared.validate(p, msync::ddacq + msync::ccacq));

regards,
alexander.

.