Integrated: 8357650: ThreadSnapshot to take snapshot of thread for thread dumps

[Alex Menkov]

On Sat, 24 May 2025 00:17:26 GMT, Alex Menkov <amenkov at openjdk.org> wrote:

> This is first (hotspot) part of the update for `HotSpotDiagnosticMXBean.dumpThreads` and `jcmd Thread.dump_to_file` to include lock information in thread dumps (JDK-8356870).
> The update has been split into parts to simplify reviewing.
> The fix contains an implementation of `jdk.internal.vm.ThreadSnapshot` class to gather required information about a thread.
> Second (dependent) part includes changes in `HotSpotDiagnosticMXBean.dumpThreads`/`jcmd Thread.dump_to_file`, spec updates and tests for the functionality.
> 
> Testing: new `HotSpotDiagnosticMXBean.dumpThreads`/`jcmd Thread.dump_to_file` functionality was tested in loom repo;
>   sanity tier1 (this fix only)

This pull request has now been integrated.

Changeset: 406f1bc5
Author:    Alex Menkov <amenkov at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/406f1bc5b94408778063b885cdac807fd1501e44
Stats:     716 lines in 10 files changed: 712 ins; 0 del; 4 mod

8357650: ThreadSnapshot to take snapshot of thread for thread dumps

Co-authored-by: Alan Bateman <alanb at openjdk.org>
Co-authored-by: Alex Menkov <amenkov at openjdk.org>
Reviewed-by: sspitsyn, kevinw

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PR: https://git.openjdk.org/jdk/pull/25425