RFR: 8332360: JVM hangs at exit when running on a uniprocessor [v2]

[Coleen Phillimore]

On Mon, 20 May 2024 12:54:13 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Restored the TryLock in the ReenterI (wait) case with a comment.
>> 
>> Tested with tier1-4.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix comment

I agree that hoisting the first TryLock out of the loop would be correct, but I can't wrap my head around the non-mt case.  If the TryLock after the park fails, is it possible for the one before the next park could succeed.  IE as if spin count = 2?  Anyway, I prefer restoring the code as it was since there is a TrySpin there and it gives the chance to explain why the TryLock is also required, and there are other things going on in this code that I don't want to interfere with.

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PR Comment: https://git.openjdk.org/jdk/pull/19293#issuecomment-2120418242