volatile long value;
    volatile long q0, q1, q2, q3, q4, q5, q6;

    Cell(long x) {
      value = x;
    }

    final boolean cas(long cmp, long val) {
      return UNSAFE.compareAndSwapLong(this, VALUE_OFFSET, cmp, val);
    }

    // Unsafe mechanics
    private static final Unsafe UNSAFE;
    private static final long VALUE_OFFSET;

    static {
      try {