[foreign-jextract] RFR: Minor change for possible race in shared resource list [v2]

[Radoslaw Smogura]

On Sat, 24 Apr 2021 16:14:05 GMT, Radoslaw Smogura <github.com+7535718+rsmogura at openjdk.org> wrote:

>> (1) One or more threads can see "prev" as CLOSED_LIST. Even those CAS will be performed
>> and list head will be set to new cleanup. Than exception is going to be thrown.
>> 
>> (2) Than cleanup will continue (maybe skipping just added cleanup).
>> 
>> If in addition, other thread will join in parallel to (1) with cleanup2, than
>> queue could look like this HEAD = cleanup2 -> list end marker.
>
> Radoslaw Smogura has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Make update of list head (FST) using atomic CAS, because
>   `cleanup` method can race with `add` about changing FST.
>   
>   Small code re-arrangement, to disable double load of FST during first loop pass

Let me close it.

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PR: https://git.openjdk.java.net/panama-foreign/pull/519