RFR: 8298059: Linked stack watermarks don't support nesting [v3]

[Erik Österlund]

On Tue, 13 Dec 2022 14:20:17 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> EscapeBarrier do `KeepStackGCProcessedMark ksgcpm(deoptee_thread())` while the deoptee/target thread is blocked.
> 
> So to me it seem like a concurrent handshake may also create a KeepStackGCProcessedMark.
> 
> Thus this lock should be needed ?

The passed in thread is which thread Thread::current wants to keep processed. So the data structure manipulated is on Thread::current.

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PR: https://git.openjdk.org/jdk/pull/11530