Using C++11+ in hotspot

[Martin Buchholz]

On Mon, Aug 6, 2018 at 1:16 AM, Andrew Haley <aph at redhat.com> wrote:

> On 08/05/2018 04:30 PM, Martin Buchholz wrote:
> > Here's one example of code that actually did go wrong with Google's
> latest
> > internal toolchain, because the copy was not in fact word-atomic.  Thanks
> > to whoever added the comment long ago.
> >
> > static inline void copy_table(address* from, address* to, int size) {
> >   // Copy non-overlapping tables. The copy has to occur word wise for MT
> > safety.
> >   while (size-- > 0) *to++ = *from++;
> > }
> >
> > Recommendation: target C++11 for jdk12;
> I don't think that helps.  There's no legal way AFAICS to force an atomic
> access to non-atomic types in C++11.
>

Ohh... perhaps that's the idea  behind atomic_ref
https://en.cppreference.com/w/cpp/atomic/atomic_ref
we only have to wait one more decade for that to become available.

I don't know what is actually being copied here, but can't the underlying
type be atomic<address*> ?