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

[Thomas Schatzl]

On Fri, 1 Aug 2025 13:44:41 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   * review ayang
>
> test/hotspot/jtreg/gc/g1/TestCodeCacheUnloadDuringConcCycle.java line 165:
> 
>> 163:             // can start.
>> 164:             System.out.println(TestCodeCacheUnloadDuringConcCycle.AFTER_FIRST_CYCLE_MARKER);
>> 165:             System.out.flush();
> 
> I thought println already flushes the stdout. Why is explicit flush needed?

The spec (javadoc) does not define whether the `PrintStream` for `System.out` is one that does auto flushing afaict. However the current implementation does that, so I removed the explicit `flush()` call.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26592#discussion_r2250721141