On Thu, 11 Jul 2024 17:30:21 GMT, Alan Bateman <al...@openjdk.org> wrote:
> Bringover some of the changes accumulated in the loom repo to the main line,
> most of these changes are test updates and have been baking in the loom repo
> for several months. The motive is partly to reduce the large set of changes
> that have accumulated in the loom repo, and partly to improve robustness and
> test coverage in the main line. The changes don't include any of the larger
> changes in the loom repo that are part of future JEPs.
>
> Implementation:
> - Robustness improvements to not throw OOME when unparking a virtual thread.
> - Robustness improvements to reduce class loading when a virtual thread parks
> or parks when pinned (jdk.internal.misc.VirtualThreads is removed,
> jdk.internal.event.VirtualThreadPinnedEvent is eagerly loaded)
> - VirtualThread changes to reduce contention on timer queues when doing
> timed-park
>
> Tests:
> - New tests for monitor enter/exit/wait/notify (this is a subset of the tests
> in the loom repo, we can't move many tests because they depend on on the
> changes to the object monitor implementation)
> - New test infrastructure to allow tests use a custom scheduler. This updates
> many tests to make use of this infrastructure, the "local" ThreadBuidlers is
> removed.
> - More test scenarios added to ThreadAPI and JVMTI GetThreadStateTest.java
> - New test for ThreadMXBean.getLockedMonitor with synchronized native methods
> - Reimplement of JVMTI VThreadEvent test to improve reliability
> - Rename some tests to get consistent naming
> - Diagnostic output in several stress tests to help trace progress in the
> event of a timeout
>
> Testing: tier1-6
Q: There are some new files with a copyright year ranges. They are probably
renamed files. Should their copyright years be updated?
test/jdk/java/lang/Thread/virtual/ThreadAPI.java line 1113:
> 1111: @Test
> 1112: void testYield3() throws Exception {
> 1113: assumeTrue(VThreadScheduler.supportsCustomScheduler(), "No
> support for custom schedulers");
Q: What was the reason to rename `testYield2()` to `testYield3()`?
test/jdk/java/lang/Thread/virtual/stress/Skynet.java line 72:
> 70: System.out.format("Result: %d in %s ms%n", sum, (end-start));
> 71: if (sum != expected)
> 72: throw new RuntimeException("Expected " + expected);
Nit: This probably needs a copyright update.
-------------
PR Review: https://git.openjdk.org/jdk/pull/20143#pullrequestreview-2185389469
PR Review Comment: https://git.openjdk.org/jdk/pull/20143#discussion_r1682627996
PR Review Comment: https://git.openjdk.org/jdk/pull/20143#discussion_r1682604568
