RFR: 8373118: Test java/lang/Thread/virtual/Starvation.java timed out [v32]

[Doug Lea]

> Changes signal filtering to avoid possible starvation

Doug Lea has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 45 additional commits since the last revision:

 - Merge branch 'openjdk:master' into JDK-8373118
 - setup for helpJoin
 - Merge branch 'openjdk:master' into JDK-8373118
 - reduce interference after stalls
 - Avoid yield, for performance test
 - Don't oversignal LIFO
 - Try out different approach
 - Simplify scan mode control by moving and reworking topLevelExec and throwing on trim
 - Another set of contend vs deactivate vs park tradeoffs
 - Fix missing undo
 - ... and 35 more: https://git.openjdk.org/jdk/compare/ce27d5c9...1b9272b3

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28797/files
  - new: https://git.openjdk.org/jdk/pull/28797/files/7ae93ed7..1b9272b3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28797&range=31
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28797&range=30-31

  Stats: 9477 lines in 285 files changed: 4647 ins; 1548 del; 3282 mod
  Patch: https://git.openjdk.org/jdk/pull/28797.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28797/head:pull/28797

PR: https://git.openjdk.org/jdk/pull/28797