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) ------------- Commit messages: - initial fix Changes: https://git.openjdk.org/jdk/pull/25425/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25425&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8357650 Stats: 736 lines in 8 files changed: 733 ins; 0 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/25425.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/25425/head:pull/25425 PR: https://git.openjdk.org/jdk/pull/25425
