8307425: Socket input stream read burns CPU cycles with back-to-back poll(0) calls

[dfuch]

Backport the fix for JDK-8307425 from openjdk/jdk to jdk20u.
This is a clean backport.

It fixes places in NIO where nanoseconds are rounded down to milliseconds, leading to expensive tight poll/read loops in some scenarios - where for instance a 1ms timeout was supplied.

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8307425: Socket input stream read burns CPU cycles with back-to-back poll(0) calls

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk20u.git pull/80/head:pull/80
$ git checkout pull/80

Update a local copy of the PR:
$ git checkout pull/80
$ git pull https://git.openjdk.org/jdk20u.git pull/80/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 80

View PR using the GUI difftool:
$ git pr show -t 80

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk20u/pull/80.diff

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[bridgekeeper]

👋 Welcome back dfuchs! 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 backport pull request has now been updated with issue from the original commit.

[openjdk]

@dfuch This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8307425: Socket input stream read burns CPU cycles with back-to-back poll(0) calls

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[mlbridge]

Webrevs

• 00: Full (0ad2d5c6)

[dfuch]

/integrate

[openjdk]

Going to push as commit 2302454.
Since your change was applied there has been 1 commit pushed to the master branch:

• 511ba72: 8304350: Font.getStringBounds calculates wrong width for TextAttribute.TRACKING other than 0.0

Your commit was automatically rebased without conflicts.

[openjdk]

@dfuch Pushed as commit 2302454.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.