RFR (S) CR 8014966: Add the proper Javadoc to @Contended

Peter Levart peter.levart at gmail.com
Thu May 23 17:37:54 UTC 2013

Hi Aleksey,

What's not very clear is whether the class-level @Contended is the same 
as class-level @Contended("group") - is the tag used or ignored when 
specified on the class-level. What does the following do?

class C {
    @Contended("x") int a;
    @Contended("y") int b;
    int c;

Regards, Peter

On 05/23/2013 06:16 PM, Aleksey Shipilev wrote:
> On 05/23/2013 07:57 PM, Peter Levart wrote:
>> Have I understood this correctly?
> Yes. @Contended on class is currently the shorthand for the @Contended
> with the same (but unknown) tag over all the fields. However, in future
> this might change, because @Contended on class might also guard the
> object header, as soon as we are brave enough to tap into the GC
> interface to allocate the @C objects aligned for the cache line boundary.
> -Aleksey.

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