8273979: move some os time related functions to os_posix for POSIX platforms

[rvansa]

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Hi all,

This pull request contains a backport of commit 1c6fa113 from the openjdk/jdk repository.

The commit being backported was authored by Matthias Baesken on 23 Sep 2021 and was reviewed by David Holmes and Lutz Schmidt.

The backport applies cleanly, was created by the /backport command.

Thanks!

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Progress

• [x] Change must not contain extraneous whitespace
• [x] Commit message must refer to an issue
• [ ] JDK-8273979 needs maintainer approval

Warning

 ⚠️ Found leading lowercase letter in issue title for 8273979: move some os time related functions to os_posix for POSIX platforms

Issue

• JDK-8273979: move some os time related functions to os_posix for POSIX platforms (Enhancement - P4 - Requested)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk17u-dev.git pull/2831/head:pull/2831
$ git checkout pull/2831

Update a local copy of the PR:
$ git checkout pull/2831
$ git pull https://git.openjdk.org/jdk17u-dev.git pull/2831/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2831

View PR using the GUI difftool:
$ git pr show -t 2831

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk17u-dev/pull/2831.diff

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