8354060: LinkedBlockingDeque.clear() should preserve weakly-consistent iterators

[kabutz]

LinkedBlockingDeque.clear() should preserve weakly-consistent iterators by linking f.prev and f.next back to f, allowing the iterators to continue from the first or last respectively. This would be consistent with how the other node-based weakly consistent queues LinkedBlockingQueue LinkedTransferQueue, ConcurrentLinkedQueue/Deque work.

The LBD already supports self-linking, since that is done by the unlinkFirst() and unlinkLast() methods, and the iterators and spliterator all support this.

This can be fixed very easily by linking both f.prev and f.next back to f.

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8354060: LinkedBlockingDeque.clear() should preserve weakly-consistent iterators (Bug - P4) ⚠️ Issue is not open.

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/24488/head:pull/24488
$ git checkout pull/24488

Update a local copy of the PR:
$ git checkout pull/24488
$ git pull https://git.openjdk.org/jdk.git pull/24488/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 24488

View PR using the GUI difftool:
$ git pr show -t 24488

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/24488.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back kabutz! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

@kabutz The following label will be automatically applied to this pull request:

• core-libs

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing list. If you would like to change these labels, use the /label pull request command.

[mlbridge]

Webrevs

• 00: Full (1a59759a)

[bridgekeeper]

@kabutz This pull request has been inactive for more than 4 weeks and will be automatically closed if another 4 weeks passes without any activity. To avoid this, simply add a new comment to the pull request. Feel free to ask for assistance if you need help with progressing this pull request towards integration!

[kabutz]

These changes have been included in #24925