RFR: 8342818: Implement JEP 509: JFR CPU-Time Profiling [v17]

[Johannes Bechberger]

On Tue, 27 May 2025 16:27:02 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> It can be a timer_t*
>> 
>> Then it's fwd declarable.
>
> If it's typedeffed as an int or a pointer (in sys/types.h or signal.h), then it won't even need a forward declaration. Try without it and see what happens.

It seems to normally be a pointer. I'll try the forward declaration later.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25302#discussion_r2109658273