RFR: 8288899: java/util/concurrent/ExecutorService/CloseTest.java failed with "InterruptedException: sleep interrupted" [v49]

[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 incrementally with one additional commit since the last revision:

  More cleanup

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14301/files
  - new: https://git.openjdk.org/jdk/pull/14301/files/5f40a9d2..45585dc3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14301&range=48
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14301&range=47-48

  Stats: 11 lines in 3 files changed: 1 ins; 6 del; 4 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