[foreign-memaccess] RFR: JDK-8252757: Add support for shared segments (followup)

[Jorn Vernee]

On Thu, 10 Sep 2020 14:42:50 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> I realized there's a small issue in the API code for shared segment support: the liveness test is always performed
> inside MemoryScope (e.g. on share(), confineTo() and close()). While this is ok, there is an usability issue, in that
> the `checkValidState` method inside MemoryScope throws raw scoped exceptions (as this routine is really meant only to
> be used during memory access).  A better solution is to move the liveness check outside the scope implementation for
> these operations, and do the check in AbstractMemorySegment, which correctly wraps the exception.  I've added a
> comprehensive test which checks that no raw exceptions are leaked from the segment API.

Marked as reviewed by jvernee (Committer).

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PR: https://git.openjdk.java.net/panama-foreign/pull/318