RFR: 8263551: Provide shared lock-free FIFO queue implementation [v4]

[Kim Barrett]

On Tue, 30 Mar 2021 19:11:39 GMT, Man Cao <manc at openjdk.org> wrote:

>> Hi all,
>> 
>> Could anyone review this change that is mainly code motion? It creates a generalized lock-free queue implementation based on G1DirtyCardQueueSet::Queue, which will be used by JDK-8236485 in the future.
>> 
>> The shared LockFreeQueue is similar to the existing LockFreeStack. The notable difference is that the LockFreeQueue has an additional template parameter for whether to use GlobalCounter::CriticalSection to avoid ABA problem.
>> 
>> -Man
>
> Man Cao has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revise comments and move trailing padding.

Looks good.

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Marked as reviewed by kbarrett (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2986