RFR: 8364343: Virtual Thread transition management needs to be independent of JVM TI [v9]

[Alan Bateman]

On Thu, 20 Nov 2025 23:05:26 GMT, Patricio Chilano Mateo <pchilanomate at openjdk.org> wrote:

>> How about removing these methods and just have an extra boolean parameter in `start/endTransition`?
>> https://github.com/pchilano/jdk/compare/JDK-8364343...pchilano:jdk:startEndTransitionsOnly
>
> I renamed the methods as suggested. I remembered that we separated ThreadStart/ThreadEnd in 8306028 for future improvements related to JVMTI. Not sure if that’s still relevant but in any case probably better to leave that discussion for a separate bug.

Given the comment block to define the terms "mount transition" and "unmount transition" then we could go a bit further and make it 6 methods: start/endMountTransition, start/endUnmountTransition, endFirstMountTransition and  startLastUnmountTransition. We don't have to do it now, but it would make the use-sites clearer I think.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28361#discussion_r2578388614