RFR: 8369622: GlobalChunkPoolMutex needs to be recursive

[David Holmes]

On Mon, 13 Oct 2025 06:43:49 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

>> src/hotspot/share/memory/arena.cpp line 43:
>> 
>>> 41: // code and other areas.  For many calls, the current thread has not
>>> 42: // been created so we cannot use Mutex.
>>> 43: class RecursivePlatformMutex : public PlatformMutex {
>> 
>> There's already recursive platform Mutex in MutexLocker.hpp
>
> D'oh, I didn't know that.

But you can't use that one because we may not have a current thread and we don't want safepoint interactions for JavaThreads IIUC.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27759#discussion_r2427925126