On Fri, 25 Jul 2025 07:05:55 GMT, Alan Bateman <al...@openjdk.org> wrote:

>> Okay, thanks.
>
> Once this change is in main line then we can sync'up the loom repo and work 
> on the follow-up changes. The loom repo has changes (that are not in main 
> line) for "suspending" an unmounted thread. For the mounted case then we'll 
> need checks in the handshake to ensure that the expected virtual threads is 
> mounted. We'll need stress tests of course and we can collaborate there in 
> advance of proposing changes for main line.

> Note that java_thread may already be null so we don't get to execute line 836.

I'm having some trouble with this statement. Working backwards from L836, I see
the nullptr check on L826 and the check for non-virtual thread and bail on L827
and L831. However, if we saw nullptr on L826 and we have a virtual thread, then
we can get to L836 even when we started off with a null java_thread.

So I guess I'm not sure what point you're trying to make with the statement.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26287#discussion_r2231702449

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