code: public long getStealCount() {
          AuxState sc = auxState;
          long count = (sc == null) ? 0L : sc.stealCount;
          WorkQueue[] ws; WorkQueue w;
          if ((ws = workQueues) != null) {
              for (int i = 1; i < ws.length; i += 2) {
                  if ((w = ws[i]) != null)
                      count += w.nsteals;
              }
          }
          return count;
      }
docs: Returns an estimate of the total number of tasks stolen from
  one thread's work queue by another. The reported value
  underestimates the actual total number of steals when the pool
  is not quiescent. This value may be useful for monitoring and
  tuning fork/join programs: in general, steal counts should be
  high enough to keep threads busy, but low enough to avoid
  overhead and contention across threads.
  
  @return the number of steals