> This is the implementation of JEP 425: Virtual Threads (Preview); TBD which 
> JDK version to target.
> 
> We will refresh this PR periodically to pick up changes and fixes from the 
> loom repo.
> 
> Most of the new mechanisms in the HotSpot VM are disabled by default and 
> require running with `--enable-preview` to enable.
> 
> The patch has support for x64 and aarch64 on the usual operating systems 
> (Linux, macOS, and Windows). There are stubs (calling Unimplemented) for zero 
> and some of the other ports. Additional ports can be contributed via PRs 
> against the fibers branch in the loom repo.
> 
> There are changes in many areas. To reduce notifications/mails, the labels 
> have been trimmed down for now to hotspot, serviceability and core-libs. 
> We'll add the complete set of labels when the PR is further along.
> 
> The changes include a refresh of java.util.concurrent and ForkJoinPool from 
> Doug Lea's CVS. These changes will probably be proposed and integrated in 
> advance of this PR.
> 
> The changes include some non-exposed and low-level infrastructure to support 
> the (in draft) JEPs for Structured Concurrency and Scope Locals. This is to 
> make life a bit easier and avoid having to separate VM changes and juggle 
> branches at this time.

Alan Bateman has updated the pull request with a new target base due to a merge 
or a rebase. The pull request now contains ten commits:

 - Refresh cf561073f48fad58e931a5285b92629aa83c9bd1
 - Merge with jdk-19+19
 - Refresh
 - Refresh
 - Refresh
 - Refresh
 - Merge with jdk-19+18
 - Refresh
 - Initial push

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

Changes: https://git.openjdk.java.net/jdk/pull/8166/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8166&range=05
  Stats: 104157 lines in 1144 files changed: 94155 ins; 4291 del; 5711 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8166.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8166/head:pull/8166

PR: https://git.openjdk.java.net/jdk/pull/8166

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