RFR: 8238761: Asynchronous handshakes [v3]

[Robbin Ehn]

On Fri, 18 Sep 2020 20:52:49 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Removed double check, fix comment, removed not needed function, updated logs
>
> src/hotspot/share/prims/whitebox.cpp line 2033:
> 
>> 2031:       assert(th->is_Java_thread(), "sanity");
>> 2032:       JavaThread* jt = (JavaThread*)th;
>> 2033:       ResourceMark rm;
> 
> It also might be interesting to print the "current thread" info here so
> that someone looking at the test output knows which thread handled
> the handshake (the target or a surrogate).

It's always the thread it self, added asserts to make this clear.

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PR: https://git.openjdk.java.net/jdk/pull/151