RFR: 8357847: (ch) WindowsAsynchronousFileChannelImpl should support FFM Buffers

[Alan Bateman]

On Thu, 29 May 2025 19:50:58 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Acquire the scope of a direct buffer before it is used and release it after the task has finished with it, whether the task execution is immediate or pended.

src/java.base/windows/classes/sun/nio/ch/WindowsAsynchronousFileChannelImpl.java line 452:

> 450:                 buf = dst;
> 451:                 address = ((DirectBuffer)dst).address() + pos;
> 452:                 IOUtil.acquireScope(dst, true);

I assume we'll have to change this to use IOUtil.bufferAddress(dst), and after the acquire.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25531#discussion_r2115194676