[foreign-memaccess] [Rev 04] RFR: JDK-8243073: Add support for serial confinement

[Maurizio Cimadamore]

> This patch adds support for serial confinement - e.g. a handoff operation to transfer ownership from thread A to thread
> B.
> The implementation is based on some iterations we have done in the past. I've added a test, and I've also rewritten
> some of the existing tests not to rely on waits, but to use latches instead, as observed by Paul.

Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:

  Fix wrong character in javadoc

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Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/117/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/117/files/36f67619..c7c5015c

Webrevs:
 - full: https://webrevs.openjdk.java.net/panama-foreign/117/webrev.04
 - incr: https://webrevs.openjdk.java.net/panama-foreign/117/webrev.03-04

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/117.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/117/head:pull/117

PR: https://git.openjdk.java.net/panama-foreign/pull/117