Integrated: 8320707: Virtual thread test updates

[Alan Bateman]

On Sat, 16 Dec 2023 17:25:20 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> A lot of test changes have accumulated in the loom repo, this includes both new tests and updates to existing tests. Some of these updates can be brought to the main line. This update brings over:
> 
> - The existing tests for pinning use synchronized blocks. In preparation for changes to allow carrier thread be released when a virtual thread parks holding a monitor or blocks on monitorenter, these tests are changed to pin by having a native frame on the stack. This part includes test infrastructure to make it easy to add more tests that do operations while pinned. The tests still test what they were originally created to test of course.
> 
> - The test for the JFR jdk.VirtualThreadPinned event is refactored to allow for additional cases where the event may be reported.
> 
> - ThreadAPI is expanded to cover test for uncaught exception handling.
> 
> - GetStackTraceWhenRunnable is refactored to not use a Selector, otherwise this test will be invalidated when blocking selection operations release the carrier.
> 
> - StressStackOverflow is dialed down to run for 1m instead of 2mins.
> 
> - The use of CountDownLatch in a number of tests that poll thread state has been dropped to keep the tests as simple as possible.

This pull request has now been integrated.

Changeset: b67b71cd
Author:    Alan Bateman <alanb at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/b67b71cd87c62f15d5b73f923c300d0f77c988f5
Stats:     981 lines in 16 files changed: 618 ins; 213 del; 150 mod

8320707: Virtual thread test updates

Reviewed-by: jpai

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PR: https://git.openjdk.org/jdk/pull/17136