RFR: 8302899: Executors.newSingleThreadExecutor can use Cleaner to shutdown executor [v4]

[Brent Christian]

On Tue, 21 Feb 2023 20:27:44 GMT, Martin Buchholz <martin at openjdk.org> wrote:

>> jtreg will look after this. The default timeout is 120s but it can be adjusted with a timeout factor (make time uses a timeout factor of 4). So it would be possible to put a limit on this in the test but it can be problematic, e.g. with debug builds + Xcomp for example.
>
> I have written such code many times, and I've always had success with a (jtreg-scaled) 10 second timeout.  E.g.
> 
> static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000);
> 
> (But that's before I became aware of existence of (slow) Raspberry Pis.)
> 
> I continue to feel guilty about never having written a proper gc awaiting library utility for openjdk, like I did for guava here:
> 
> https://github.com/google/guava/blob/master/guava-testlib/src/com/google/common/testing/GcFinalization.java

Now there's [jdk.test.lib.util.ForceGC](https://github.com/openjdk/jdk/blob/master/test/lib/jdk/test/lib/util/ForceGC.java).

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PR: https://git.openjdk.org/jdk/pull/12675