On Mon, 12 Aug 2024 17:07:42 GMT, Doug Lea <d...@openjdk.org> wrote:
> The Exchanger class uses spin-waits that are hostile to some uses of
> VirtualThreads. Improving this requires a means of estimating whether there
> are many VirtualThreads with few carriers, which can be supported by adding a
> method in class ForkJoinWorkerThread. This enables a reworking of the
> exchange method, and can also be used to deal with similar issues in
> LinkedTransferQueue and possibly elsewhere. We leave for now open whether
> this method (hasKnownQueuedWork) should be public, which would allow users to
> use it in similar contexts, at the possible expense of revealing too much
> about current VT implementation
src/java.base/share/classes/java/util/concurrent/Exchanger.java line 379:
> 377: if ((v = p.match) != null) {
> 378: MATCH.set(p, null);
> 379: break outer; // spin wait
Is this comment accurate?
-------------
PR Review Comment: https://git.openjdk.org/jdk/pull/20554#discussion_r1715164058
