On Wed, 27 Apr 2022 14:24:20 GMT, Alan Bateman <[email protected]> wrote:
>> 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
src/java.base/share/classes/java/util/concurrent/ThreadPerTaskExecutor.java
line 45:
> 43: * threads is unbounded.
> 44: */
> 45: class ThreadPerTaskExecutor implements ExecutorService {
This class manages the set of per-task threads which arguably should be the job
of the thread container, and it awkwardly overrides the container's set of
threads by setting a field on `SharedThreadContainer.threadsSupplier`.
`SharedThreadContainer` supports a number of different shared container
policies that could be made clearer.
Architecturally i think this could be better layered but it can be iterated on
later.
-------------
PR: https://git.openjdk.java.net/jdk/pull/8166
