RFR: 8369255: Assess and remedy any unsafe usage of the Semaphores used by JFR

[Erik Gahlin]

On Thu, 9 Oct 2025 10:07:35 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

> Greetings,
> 
> Please help review this change set that prevents a race in the shutdown of the VM, where the CRT is destroyed while threads might still be running JFR code. Please see the JIRA issue for an explanation.
> 
> Testing: jdk_jfr, tier 1 - 3
> 
> Thanks
> Markus

Marked as reviewed by egahlin (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27722#pullrequestreview-3320588749