RFR: 8365057: Add support for java.util.concurrent lock information to Thread.dump_to_file

[David Holmes]

On Tue, 23 Sep 2025 20:22:31 GMT, Alex Menkov <amenkov at openjdk.org> wrote:

> The fix updates `jcmd Thread.dump_to_file`/`HotSpotDiagnosticMXBean.dumpThreads` implementation to report thread which owns parkBlocker.
> 
> Testing: tier1..4,hs-tier5-svc

src/java.base/share/classes/jdk/internal/vm/ThreadSnapshot.java line 52:

> 50: 
> 51:     // the owner of the blockerObject when the object is park blocker and is AQS
> 52:     private Thread parkBlockerOwner;

Just wondering whether it makes sense to make the owner field part of the `ThreadBlocker` record?

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PR Review Comment: https://git.openjdk.org/jdk/pull/27457#discussion_r2374595923