RFR: 8369631: Assess and remedy any unsafe usage of the sr_semaphore Semaphore in the Posix signal code

[Stefan Karlsson]

On Mon, 13 Oct 2025 06:52:32 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Replace the statically allocated "semaphore" with a pointer and lazily initialize it. I chose this approach as we already have a second Semaphore declared that way.
> 
> Testing:
> - tiers 1-3 sanity
> 
> Thanks.

Looks good. I don't understand how those semaphore were guaranteed to be correctly initialized before, so I'm happy to see this change that explicitly initialization of them.

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Marked as reviewed by stefank (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27762#pullrequestreview-3334155703