RFR: 8373839: Disable JVM TI suspension during JNI critical regions

[Patricio Chilano Mateo]

On Fri, 19 Dec 2025 12:59:39 GMT, David Holmes <dholmes at openjdk.org> wrote:

> > I was thinking on having a in_critical() check in HandshakeState::try_process when the op returned by get_op() is `SuspendThreadHandshakeClosure`
> 
> Checking the generic handshake code for a specific handshake operation seems like a horrendous hack - that code should never have to specialize based on the operation. The operation should handle any special cases.
>
We don't need to check for a specific operation, we can make it general by defining a virtual method in `HandshakeClosure` (e.g. `needs_jni_critical_check`) that's overriden by any operation that requires this check.

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PR Comment: https://git.openjdk.org/jdk/pull/28884#issuecomment-3675063379