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

[Kim Barrett]

> On May 22, 2018, at 6:12 PM, Stefan Johansson <stefan.johansson at oracle.com> wrote:
> 
> 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

Thanks.

> 
> 
>>> 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.