RFR: 8347408: Create an internal method handle adapter for system calls with errno [v9]
Per Minborg
pminborg at openjdk.org
Thu May 8 09:21:35 UTC 2025
> 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.
Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
Address comments
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/25043/files
- new: https://git.openjdk.org/jdk/pull/25043/files/c5159e5f..9772c703
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=25043&range=08
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=25043&range=07-08
Stats: 51 lines in 3 files changed: 9 ins; 19 del; 23 mod
Patch: https://git.openjdk.org/jdk/pull/25043.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/25043/head:pull/25043
PR: https://git.openjdk.org/jdk/pull/25043
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