RFR: 8293067: (fs) Implement WatchService using system library (macOS)

[Brian Burkhalter]

On Thu, 8 Sep 2022 14:49:52 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>>> In our CI system `test/jdk/java/nio/file/WatchService/Move.java` appears to time out consistently, although I have not seen it happen on my local machine.
>> 
>> Can you provide the `.jtr` file, please? I haven't seen the test hang, but by inserting different delays different systems can expose synchronization issues, of course.
>
>> Can you provide the `.jtr` file, please? I haven't seen the test hang, but by inserting different delays different systems can expose synchronization issues, of course.
> 
> I can't give the whole .jtr file due to internal content, but here are some excerpts.

> @bplb Thanks for the log. It's really strange, though, that there is nothing from `System.out` because the test itself logs intensively even before any `WatchService` code is executed. Also, AFAIK timeouts trigger thread dump, which would be quite helpful. Are you not at liberty to share those as well?

@mkartashev When a test times out, often not a lot of information is captured, including `System.out` and thread dumps. It can be frustrating to debug.

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PR: https://git.openjdk.org/jdk/pull/10140