RFR: 8203028: Simplify reference processing in light of JDK-8175797

[Stefan Johansson]

Hi Kim,

On 2018-05-20 17:12, Kim Barrett wrote:
>> On May 15, 2018, at 12:09 AM, Kim Barrett <kim.barrett at oracle.com> wrote:
>> New webrev, rebased to include JDK-8201491:
>> http://cr.openjdk.java.net/~kbarrett/8203028/open.01/
>>
>> New webrevs with above changes:
>> full: http://cr.openjdk.java.net/~kbarrett/8203028/open.02/
Thanks for doing this work to simplify the reference processing, really 
nice to not have to do special treatment of the next field. The change 
looks good.

Cheers,
Stefan


>> incr: http://cr.openjdk.java.net/~kbarrett/8203028/open.02.inc/
> Following up on a suggestion from Mark Reinhold in the discussion of JDK-8203327
> on the core-libs list, I’ve added the following comment to the Reference.queue field.
>
> diff -r 98982cddbac0 -r 2429129c4d48 src/java.base/share/classes/java/lang/ref/Reference.java
> --- a/src/java.base/share/classes/java/lang/ref/Reference.java	Mon May 14 18:01:36 2018 -0400
> +++ b/src/java.base/share/classes/java/lang/ref/Reference.java	Sun May 20 11:06:48 2018 -0400
> @@ -131,6 +131,14 @@
>   
>       private T referent;         /* Treated specially by GC */
>   
> +    /* The queue this reference gets enqueued to by GC notification or by
> +     * calling enqueue().
> +     *
> +     * When registered: the queue with which this reference is registered.
> +     *        enqueued: ReferenceQueue.ENQUEUE
> +     *        dequeued: ReferenceQueue.NULL
> +     *    unregistered: ReferenceQueue.NULL
> +     */
>       volatile ReferenceQueue<? super T> queue;
>   
>       /* The link in a ReferenceQueue's list of Reference objects.
>