On Tue, 5 Jan 2021 12:56:49 GMT, Maurizio Cimadamore <mcimadam...@openjdk.org>
wrote:
> When the size of the memory map is zero, FileChannelImpl returns a `null`
> Unmapper - this creates issues to the mapped memory segment implementation.
>
> To fix, I've created an empty mapped segment class which is initialized to
> sensible defaults, and whose implenentation of force/load etc. do nothing.
>
> We already had a test for this condition - but the test was missing the
> `@Test` annotation, so it was not run! I've now beefed up the test a bit to
> make sure that mapped segment operations do not throw.
src/jdk.incubator.foreign/share/classes/jdk/internal/foreign/MappedMemorySegmentImpl.java
line 128:
> 126: modes, scope);
> 127: } else {
> 128: return new EmptyMappedMemorySegmentImpl();
While a little pedantic, should the `mapMode` be considered so that an empty
mapped segment will feature the expected access modes when queried through the
`accessModes` API ?
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PR: https://git.openjdk.java.net/jdk16/pull/83
