code: public static void helpQuiesce() {
      Thread t;
      if ((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) {
        ForkJoinWorkerThread wt = (ForkJoinWorkerThread) t;
        wt.pool.helpQuiescePool(wt.workQueue);
      } else
        ForkJoinPool.quiesceCommonPool();
    }
docs: Possibly executes tasks until the pool hosting the current task
  {@linkplain ForkJoinPool#isQuiescent is quiescent}. This method may be of use in designs in
  which many tasks are forked, but none are explicitly joined, instead executing them until all
  are processed.