onSpinWait​() method of Thread class - Java 9

Question

While learning Java 9 features I came across a new method of Thread class, called onSpinWait​. As per javadocs, this method is used for this:

Answer 1

I just want to add my 2 cents after reading the document and the source code for it. This method might trigger some optimizations and might not - so care must be taken - you can't really rely on it - since this a hint to the CPU more than demand, probably there's no initial relying whatsoever either way... Meaning that it's actual source code looks like this:

@HotSpotIntrinsicCandidate
public static void onSpinWait() {}

What this actually means is that this method is basically a NO-OP until it hits the c2 compiler in the JIT, according to this