> 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 incrementally with one additional 
commit since the last revision:

  Refresh 7965cc6b168e567ac2596f2fbc3b00a7d99b7e1e


  - all: https://git.openjdk.java.net/jdk/pull/8166/files
  - new: https://git.openjdk.java.net/jdk/pull/8166/files/0864cb09..f2ed4f9c

 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8166&range=07
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8166&range=06-07

  Stats: 505 lines in 15 files changed: 139 ins; 189 del; 177 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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