[crac] RFR: Prevent concurrent cleanup by cleaner thread and checkpoint notifications

[Radim Vansa]

On Tue, 30 May 2023 16:19:24 GMT, Anton Kozlov <akozlov at openjdk.org> wrote:

>> The interrupt wakes up cleaner in `queue.remove()` (line 161) in case it's blocking for next task.
>
> OK, thanks. But what if the interrupt arrives to the thread during a cleaning while that runs, it may interrupt the cleaning, right?

That's correct; I don't see any way to mitigate that, though, besides changing the queue implementation to allow more targeted wakeup.

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PR Review Comment: https://git.openjdk.org/crac/pull/73#discussion_r1211242978