Strange code in java.util.concurrent.LinkedBlockingQueue

Question

All!

I found strange code in LinkedBlockingQueue:

private E dequeue() {
        // assert takeLock.isHeldByCurrentThread();
        Node h =         


        

Answer 1

If you look at the jsr166 src then you will find the offending commit, scroll down to v1.51

This shows the answer is in this bug report

The full discussion can be found in a jsr.166 mailing list thread

The "helping GC" bit is about avoiding things bleeding into tenured.