Integrated: 8347408: Create an internal method handle adapter for system calls with errno

[Per Minborg]

On Mon, 5 May 2025 16:53:58 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> As we advance, converting older JDK code to use the relatively new FFM API requires system calls that can provide `errno` and the likes to explicitly allocate a MemorySegment to capture potential error states. This can lead to negative performance implications if not designed carefully and also introduces unnecessary code complexity.
> 
> Hence, this PR proposes adding a JDK internal method handle adapter that can be used to handle system calls with `errno`, `GetLastError`, and `WSAGetLastError`.
> 
> It relies on an efficient carrier-thread-local cache of memory regions to allide allocations.

This pull request has now been integrated.

Changeset: 45cf32bd
Author:    Per Minborg <pminborg at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/45cf32bd2c9e44e2fcbb4b8d0714b87e078cdb7c
Stats:     650 lines in 4 files changed: 649 ins; 0 del; 1 mod

8347408: Create an internal method handle adapter for system calls with errno

Reviewed-by: mcimadamore

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PR: https://git.openjdk.org/jdk/pull/25043