[jdk21u-dev] RFR: 8370636: com/sun/jdi/TwoThreadsTest.java should wait for completion of all threads [v2]

[SendaoYan]

> Hi all,
> 
> This pull request contains a backport of commit [d1860370](https://github.com/openjdk/jdk/commit/d1860370635e1c96a9b6c497861e5573c23dd281) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Leonid Mesnik on 28 Oct 2025 and was reviewed by Chris Plummer, SendaoYan and Serguei Spitsyn.
> 
> This backport PR fix the test bug which the new virtual thread missing join() and will exit immediately. Change has been verified locally on linux-x64.
> 
> Thanks!

SendaoYan has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'openjdk:master' into backport-sendaoYan-d1860370-master
 - Backport d1860370635e1c96a9b6c497861e5573c23dd281

-------------

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/2423/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/2423/files/f6d77290..5581ea8d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2423&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2423&range=00-01

  Stats: 20417 lines in 297 files changed: 9217 ins; 2169 del; 9031 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2423.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2423/head:pull/2423

PR: https://git.openjdk.org/jdk21u-dev/pull/2423