RFR: 8280832: Update usage docs for NonblockingQueue [v2]

[Kim Barrett]

On Wed, 9 Feb 2022 10:10:17 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

>> Kim Barrett has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   walulyai review
>
> src/hotspot/share/utilities/nonblockingQueue.inline.hpp line 120:
> 
>> 118:     // old_tail for extension.  We won any races with try_pop by changing
>> 119:     // away from end-marker.  So we're done.  Note that ABA is possible;
>> 120:     // try_pop could take old_tail before our update, it gets recycled and
> 
> "a concurrent try_pop could take...."

Sure, I can make that explicit.

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PR: https://git.openjdk.java.net/jdk/pull/7393