[crac] RFR: Active cleanup by CleanerImpl on checkpoint [v2]

[Radim Vansa]

On Tue, 6 Jun 2023 08:01:41 GMT, Radim Vansa <duke at openjdk.org> wrote:

>> Rather than registering PhantomCleanableRef as a resource that gets cleaned up in the C/R thread force cleanup in the CleanerImpl as this already keeps a list of all eligible references.
>
> Radim Vansa 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 three additional commits since the last revision:
> 
>  - Clean GC'ed references on checkpoint
>  - Merge branch 'crac' into sync_cleaner
>  - Prevent concurrent cleanup by cleaner thread and checkpoint notifications

@AntonKozlov Updated.

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PR Comment: https://git.openjdk.org/crac/pull/73#issuecomment-1578147252