RFR: JDK-8308300: enhance exceptions in MappedMemoryUtils.c

[Matthias Baesken]

On Fri, 19 May 2023 06:58:49 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> MappedMemoryUtils.c can generate exceptions like those :
> java.io.UncheckedIOException: java.io.IOException: Invalid argument
>        at java.base/java.nio.MappedMemoryUtils.force(MappedMemoryUtils.java:105)
>        at java.base/java.nio.Buffer$2.force(Buffer.java:890)
>        at java.base/jdk.internal.misc.ScopedMemoryAccess.forceInternal(ScopedMemoryAccess.java:317)
>        at java.base/jdk.internal.misc.ScopedMemoryAccess.force(ScopedMemoryAccess.java:305)
>        at java.base/jdk.internal.foreign.MappedMemorySegmentImpl.force(MappedMemorySegmentImpl.java:92)
>        at TestByteBuffer.testMappedSegmentAsByteBuffer(TestByteBuffer.java:327)
> 
> (we see this for example on AIX); there is some room for improvement, at least the info should be added that msync failed and caused this exception.

Hi Alan, thanks for the comments.
I changed the exception texts regarding madvise and adjusted the Java-comments

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PR Comment: https://git.openjdk.org/jdk/pull/14054#issuecomment-1554314469