RFR: 8257831: Suspend with handshakes [v2]

[Serguei Spitsyn]

On Thu, 8 Apr 2021 06:02:35 GMT, Serguei Spitsyn <sspitsyn at openjdk.org> wrote:

>> Working on pushing a new version, it will not have addressed all comments but many of them.
>> I will build and do testing before push, and start deep testing in the background.
>> 
>> I also merge with mainline.
>
> Hi Robbin,
> Thank you for the reply and suggestion to help with merge. I made the first pass through the webrev. The fix looks pretty good in general - nice simplifications! My estimation is that it should not be a big problem to merge it with Loom while it can require some effort to do so. I'm going for another pass to look on details.
> Thanks,
> Serguei

The functions JvmtiSuspendControl::suspend and JvmtiSuspendControl::resume are not really needed anymore. You probably decided to keep them around to simplify merges a little bit. Is that right?

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