RFR: 8267079: Support async handshakes that can be executed by a remote thread [v2]

[Man Cao]

On Tue, 18 May 2021 19:08:08 GMT, Man Cao <manc at openjdk.org> wrote:

>> Hi all,
>> 
>> Can I have reviews for this small refactoring change? It resolves a pending concern from [JDK-8238761](https://bugs.openjdk.java.net/browse/JDK-8238761), clarifies the code and allows more use case of async handshakes. See [JDK-8267079](https://bugs.openjdk.java.net/browse/JDK-8267079) for detailed description.
>> 
>> -Man
>
> Man Cao has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Added missing deallocation and renamed "remote" to "non-self".

Closing this PR as the "arm-the-poll-only approach" seems to work, although there are some performance problems to resolve.

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PR: https://git.openjdk.java.net/jdk/pull/4005