257
Subj : Re: A question about atomic_ptr
To   : comp.programming.threads
From : Peter Dimov
Date : Sun Apr 17 2005 12:26 am

Peter Dimov wrote:
> shared_ptr<T> * ppt;
>
> shared_ptr<T> reader()
> {
>    return *atomic_load_ddacq( ppt );

Except that I now need a hazard here...

> }
>
> void writer( ... )
> {
>    lock();
>
>    shared_ptr<T> tmp( new T(**ppt) );
>
>    tmp->update( ... );
>
>    T * pp2 = new shared_ptr<T>( tmp );
>
>    atomic_exchange_rel( ppt, pp2 );
>
>    delete pp2;

.... and a check here. Back to square one. :-/

>    unlock();
> }

.

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