On Tue, 23 Sep 2025 20:22:31 GMT, Alex Menkov <amen...@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/ThreadDumper.java line 208:
> 206: Object parkBlocker = snapshot.parkBlocker();
> 207: if (parkBlocker != null) {
> 208: String suffix = (snapshot.parkBlockerOwner() != null)
This was `if (snapshot.parkBlockerOwner() instanceof Thread owner)` in the
original prototype. It avoids the null check and allow L209 to use
owner.threadId(). It also is consistent with the other use of pattern matching
with instanceof in this code.
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PR Review Comment: https://git.openjdk.org/jdk/pull/27457#discussion_r2374569271
