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

[Man Cao]

On Thu, 13 May 2021 02:05:30 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

Hi David,

By "remote" I mean any thread that is not the current running thread itself. Basically "remote" = "non-self". In the handhshake model's terminology, remote executable means "executing thread" != "target thread". Remote is commonly used as a synonym for "non-local" in literature about CPU and NUMA, e.g. "remote cache", "remote memory".

Do you prefer the old term "non_self_executable" over "remote_executable"?

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