RFR: 8369622: GlobalChunkPoolMutex needs to be recursive [v2]

[Johan Sjölen]

On Wed, 15 Oct 2025 21:48:25 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> RecursiveMutex has safepoint interactions only if the current thread is a JavaThread.  It could be modified to have a no-owner sentinel and maybe use os::current_thread() like this equivalent one does.
>> 
>> With this deferred static mechanism, I think it can allocate the semaphore which might not be allowed to be allocated with static linkage.
>> 
>> This code is almost a copy of that.
>
> I tried making RecursiveLock a template but it's sort of a pain.

It is basically a copy. The reason I went the longer (lines of code-wise) is because I'd prefer it if we didn't spread this implementation around, so having this handmade one in `arena.cpp` seems like an acceptable trade-off to having the RecursiveLock being templated and so on.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27759#discussion_r2434930029