RFR: 8263551: Provide shared lock-free FIFO queue implementation [v3]

[Kim Barrett]

On Tue, 30 Mar 2021 07:49:00 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:
> 
>   Changed to try_pop() and eliminated conditional critical section.

Changes requested by kbarrett (Reviewer).

-------------

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