RFR: 8347408: Create an internal method handle adapter for system calls with errno
Per Minborg
pminborg at openjdk.org
Mon May 5 16:59:02 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.
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Commit messages:
- Use stable values
- Merge branch 'master' into errno-util3b
- Add hashCode/equals to record to improve startup time
- Revert change to ArenaImpl
- Merge master
- Merge master
- Add test for woven allocation
- Merge branch 'master' into errno-util3
- Use lazy initialization of method handles
- Clean up visibility
- ... and 29 more: https://git.openjdk.org/jdk/compare/1501a5e4...04dc6d3e
Changes: https://git.openjdk.org/jdk/pull/25043/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25043&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8347408
Stats: 818 lines in 9 files changed: 805 ins; 0 del; 13 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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