RFR: 8364503: gc/g1/TestCodeCacheUnloadDuringConcCycle.java fails because of race printing to stdout [v2]

[Albert Mingkun Yang]

On Mon, 4 Aug 2025 08:05:03 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Hi all,
>> 
>>   please review this change to the `gc/g1/TestCodeCacheUnloadDuringConcCycle.java` test - previously, the GC that we were waiting for in the test could occur between releasing whitebox control and the marker we use to distinguish before/after test setup.
>> 
>> The change makes sure the marker is printed before releasing Whitebox control. So the concurrent start gc we look for can not happen before the marker printing.
>> 
>> Testing: passes 5000 runs of that benchmark
>> 
>> Thanks,
>>   Thomas
>
> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
> 
>   * review ayang

Marked as reviewed by ayang (Reviewer).

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

PR Review: https://git.openjdk.org/jdk/pull/26592#pullrequestreview-3083140894