Synchronization between JNI & GC

[Jungwoo Ha]

Is there a good write up on how the synchronization happen between JNI and
GC?
I am looking at the NewGlobalRef code but it has assert statement like this:

assert(!Universe::heap()->is_gc_active(), "can't extend the root set during
GC");

But how is this enforced by the JNI code calling NewGlobalRef?

Thanks,
Jungwoo
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