This is a test only change for two tests for virtual threads that hang/timeout on single core systems. The two tests involve pinning and require at least two carrier threads. The test lib used by these tests is updated to define a new method that ensures parallelism is at least a given value and both tests are updated to use this. There are a number of tests in the debugger area that may potentially use this in the future.
------------- Commit messages: - Make close idempotent - Initial commit Changes: https://git.openjdk.org/jdk/pull/10562/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10562&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8291429 Stats: 53 lines in 3 files changed: 47 ins; 0 del; 6 mod Patch: https://git.openjdk.org/jdk/pull/10562.diff Fetch: git fetch https://git.openjdk.org/jdk pull/10562/head:pull/10562 PR: https://git.openjdk.org/jdk/pull/10562
