RFR 8078490: Missed submissions in ForkJoinPool

Chris Hegarty chris.hegarty at oracle.com
Thu Apr 23 13:23:52 UTC 2015

Thanks for bringing this in Paul. The change looks ok to me, and suitable for backport.

Trivially, the test does not need the Classpath exception in its license header.


On 23 Apr 2015, at 14:00, Paul Sandoz <paul.sandoz at oracle.com> wrote:

> Hi.
> Please review this patch from Doug that fixes an issue where a submitted task to a f/j pool never gets executed.
>  http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8078490-fj-missed-submissions/webrev/
> I already counted myself and Alexey as reviewers.
> The issue manifests itself under certain conditions where by a task is submitted to a ForkJoinPool of a certain size and that task is not joined. In ForkJoin.externalPush a release write is too weak and needs to be straightened to a volatile write, which stamps in a memory fence before signalling that there is work to be performed.
> I anticipate Doug will provide a clearer fix at some point in the future. This fix is sufficient for now and for backporting to 8u60.
> Paul.

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