RFR: 8334215: serviceability/dcmd/thread/PrintMountedVirtualThread.java failing with JTREG_TEST_THREAD_FACTORY=Virtual [v2]

[Inigo Mediavilla Saiz]

On Mon, 17 Jun 2024 13:24:23 GMT, Inigo Mediavilla Saiz <duke at openjdk.org> wrote:

>> Follow up to https://github.com/openjdk/jdk/pull/19482 that was causing issues when the PrintMountedVirtualTest.java was
>> running with `JTREG_TEST_THREAD_FACTORY=Virtual` in the loom repo. 
>> 
>> - Fixes issues where the test observes the thread during transitions.
>> - Fixes a potential issue in the test where CountDownLatch.countDown unparks the main (virtual) thread and the main thread observes the dummy thread is transition .
>
> Inigo Mediavilla Saiz has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Improve assert and document conditional print

Thanks for your comments @dholmes-ora and @txominpelu . This PR is ready for another round of reviews.

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PR Comment: https://git.openjdk.org/jdk/pull/19744#issuecomment-2175643910