RFR: 8374984: Convert workerUtils to use Atomic<T> [v2]

[Kim Barrett]

On Wed, 14 Jan 2026 08:25:02 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> src/hotspot/share/gc/shared/workerUtils.cpp line 120:
>> 
>>> 118: bool SubTasksDone::try_claim_task(uint t) {
>>> 119:   assert(t < _n_tasks, "bad task id.");
>>> 120:   return !_tasks[t].load_relaxed() && !_tasks[t].compare_exchange(false, true);
>> 
>> This is one of those cases where `compare_set` is somewhat cleaner:
>> 
>> 
>>   return !_tasks[t].load_relaxed() && _tasks[t].compare_set(false, true);
>
> And maybe the same for `all_tasks_claimed_impl`?

Agreed for both cases.  Done.

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PR Review Comment: https://git.openjdk.org/jdk/pull/29201#discussion_r2692320650