On Fri, 15 Apr 2022 11:45:01 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 with a new target base due to a
> merge or a rebase. The incremental webrev excludes the unrelated changes
> brought in by the merge/rebase. The pull request contains five additional
> commits since the last revision:
>
> - Refresh
> - Refresh
> - Merge with jdk-19+18
> - Refresh
> - Initial push
src/java.base/share/classes/jdk/internal/misc/Blocker.java line 76:
> 74: && currentCarrierThread() instanceof CarrierThread ct &&
> !ct.inBlocking()) {
> 75: ct.beginBlocking();
> 76: long comp = ForkJoinPools.beginCompensatedBlock(ct.getPool());
It appears that `ForkJoinPools.beginCompensatedBlock(...)` can throw an
exception. Would such an exception require the CarrierThread's blocking state
(which we set on the previous line) to be reset by a call to
`ct.endBlocking()`? Or is it futile to reset that state if any exception gets
thrown from the call to `ForkJoinPools.beginCompensatedBlock(...)`?
src/java.base/share/classes/jdk/internal/misc/Blocker.java line 94:
> 92:
> 93: /**
> 94: * Marks the end an operation that may have blocked.
I think this should have been "Marks the end of an ..."
-------------
PR: https://git.openjdk.java.net/jdk/pull/8166
