RFR: 8288899: java/util/concurrent/ExecutorService/CloseTest.java failed with "InterruptedException: sleep interrupted" [v30]

[Doug Lea]

> Addresses Jdk 8288899 : java/util/concurrent/ExecutorService/CloseTest.java failed with "InterruptedException: sleep interrupted" and related issues.
> 
> This is a major ForkJoin update (and hard to review -- sorry) that finally addresses incompatibilities between ExecutorService and ForkJoinPool (which claims to implement it), with the goal of avoiding continuing bug reports and incompatibilities. Doing this required reworking internal control to use phaser/seqlock-style versioning schemes (affecting nearly every method) that ensure consistent data structures and actions without requiring global synchronization or locking on every task execution that would massively degrade performance. The previous lack of a solution to this was the main reason for these incompatibilities.

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 75 additional commits since the last revision:

 - Merge branch 'openjdk:master' into JDK-8288899
 - Force more orderings; improve diagnostics
 - Simplify signalling
 - Always help terminate when stopping
 - Merge branch 'openjdk:master' into JDK-8288899
 - Use non-recursive tasks in close tests
 - Allow ThreadGroup access in tck tests
 - Avoid needing test threads
 - Merge branch 'openjdk:master' into JDK-8288899
 - Avoid jtreg test group
 - ... and 65 more: https://git.openjdk.org/jdk/compare/def5d265...729e34f6

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/14301/files
  - new: https://git.openjdk.org/jdk/pull/14301/files/4eeb5e5a..729e34f6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14301&range=29
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14301&range=28-29

  Stats: 7615 lines in 177 files changed: 4876 ins; 1947 del; 792 mod
  Patch: https://git.openjdk.org/jdk/pull/14301.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14301/head:pull/14301

PR: https://git.openjdk.org/jdk/pull/14301