RFR: 8257831: Suspend with handshakes [v2]

[Robbin Ehn]

On Wed, 7 Apr 2021 16:23:08 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

>> Hi Robbin,
>> I'm looking at it. I have a concern that it can significantly impact Loom implementation. There is a non-trivial update in Loom to support virtual threads in JVMTI Suspend/Resume. So we need to make sure your approach is going to work for virtual threads as well.
>
>> Hi Robbin,
>> I'm looking at it. I have a concern that it can significantly impact Loom implementation. There is a non-trivial update in Loom to support virtual threads in JVMTI Suspend/Resume. So we need to make sure your approach is going to work for virtual threads as well.
> 
> Hi Serguei, I looked at loom implementation.
> I will help you do the merge. The main thing seem to split some logic into the handshake itself.
> 
> Thanks

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.

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