RFR: 8279294: NonblockingQueue::try_pop may improperly indicate queue is empty [v2]

[Kim Barrett]

On Thu, 20 Jan 2022 20:49:53 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

>> Kim Barrett has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:
>> 
>>  - Merge branch 'master' into fix-try-pop2
>>  - fix
>
> Lgtm!
> 
> Suggestion:
> With the comments growing after each change, maybe we rename `result` to `old_head`

Thanks @walulyai and @tschatzl for reviews.

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PR: https://git.openjdk.java.net/jdk/pull/7149