RFR: 8283044: Use asynchronous handshakes to deliver asynchronous exceptions [v3]

[Daniel D.Daugherty]

On Tue, 29 Mar 2022 00:55:38 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> I added that overload for Panama, in case they decide to use asynchronous handshakes to solve their cleanup of mapped memory issues. Same thing with virtual method should_throw() in AsyncExceptionHandshake, since they wanted to do some check first in the handshake to decide if they should throw. But I could remove them.
>
> Better to not add them until actually needed. Thanks.

If you decide to keep it, please add a comment that is there for Panama's use.

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PR: https://git.openjdk.java.net/jdk/pull/7930