RFR: 8257831: Suspend with handshakes [v4]

[Richard Reingruber]

On Mon, 12 Apr 2021 06:42:47 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> 
> 
> Technically you are correct.
> I have tested to remove this is previously version and all tests passes fine.
> The reason I kept it is because the suspender have identified a thread for suspension and deemed it suspendable, so we play nice.
> To know why suspend failed the suspender must check if thread is exiting after a failed suspend. (originally I had a bug here which caused me to wrongfully introduce this from the beginning)

Thanks for the explanation. As I understand you want to be fault tolerant
towards somewhat sloppy agents. That's of course ok. It should be explained in a
comment though.

> I'll remove it, since it simplifies the code and David's comments about this code is now out-of-line can be fixed.

Also it does not eliminate the race as far as I can tell.

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PR: https://git.openjdk.java.net/jdk/pull/3191