RFR: 8284161: Implementation of Virtual Threads (Preview) [v8]

[Mikhailo Seledtsov]

On Wed, 27 Apr 2022 14:24:20 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> This is the implementation of JEP 425: Virtual Threads (Preview).
>> 
>> 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 Extent 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

test/lib/jdk/test/lib/thread/VThreadRunner.java line 61:

> 59:     /**
> 60:      * Run a task in a virtual thread and wait for it to terminate.
> 61:      * If the task completse with an exception then it is thrown by this method.

typo: completse --> completes

test/lib/jdk/test/lib/thread/VThreadRunner.java line 121:

> 119:     /**
> 120:      * Run a task in a virtual thread and wait for it to terminate.
> 121:      * If the task completse with an exception then it is thrown by this method.

completse --> completes

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