private boolean release0(int decrement) { int oldRef = refCntUpdater.getAndAdd(this, -decrement); if (oldRef == decrement) { deallocate(); return true; } else if (oldRef < decrement || oldRef - decrement > oldRef) { // Ensure we don't over-release, and avoid underflow. refCntUpdater.getAndAdd(this, decrement); throw new IllegalReferenceCountException(oldRef, decrement); } return false; } /**