How to use

signalWork

method

in

jsr166y.ForkJoinPool

/**
 * Pushes a task. Call only by owner in unshared queues.
 *
 * @param task the task. Caller must ensure non-null.
 * @throw RejectedExecutionException if array cannot be resized
 */
final void push(ForkJoinTask<?> task) {
  ForkJoinTask<?>[] a; ForkJoinPool p;
  int s = top, m, n;
  if ((a = array) != null) {    // ignore if queue removed
    U.putOrderedObject
      (a, (((m = a.length - 1) & s) << ASHIFT) + ABASE, task);
    if ((n = (top = s + 1) - base) <= 2) {
      if ((p = pool) != null)
        p.signalWork();
    }
    else if (n >= m)
      growArray(true);
  }
}

U.compareAndSwapObject(a, i, t, null)) {
if (q.top - (q.base = b + 1) > 1)
  signalWork();    // help pushes signal
return t;

signalWork();
return;

  signalWork();               // wake up or create replacement
if (ex == null)                 // help clean refs on way out
  ForkJoinTask.helpExpungeStaleExceptions();

/**
 * Enqueues the given task in the submissionQueue.  Same idea as
 * ForkJoinWorkerThread.pushTask except for use of submissionLock.
 *
 * @param t the task
 */
private void addSubmission(ForkJoinTask<?> t) {
  final ReentrantLock lock = this.submissionLock;
  lock.lock();
  try {
    ForkJoinTask<?>[] q; int s, m;
    if ((q = submissionQueue) != null) {    // ignore if queue removed
      long u = (((s = queueTop) & (m = q.length-1)) << ASHIFT)+ABASE;
      UNSAFE.putOrderedObject(q, u, t);
      queueTop = s + 1;
      if (s - queueBase == m)
        growSubmissionQueue();
    }
  } finally {
    lock.unlock();
  }
  signalWork();
}

/**
 * Pushes a task. Call only from this thread.
 *
 * @param t the task. Caller must ensure non-null.
 */
final void pushTask(ForkJoinTask<?> t) {
  ForkJoinTask<?>[] q; int s, m;
  if ((q = queue) != null) {    // ignore if queue removed
    long u = (((s = queueTop) & (m = q.length - 1)) << ASHIFT) + ABASE;
    UNSAFE.putOrderedObject(q, u, t);
    queueTop = s + 1;         // or use putOrderedInt
    if ((s -= queueBase) <= 2)
      pool.signalWork();
    else if (s == m)
      growQueue();
  }
}

if (!tryTerminate(false)) {
  if (ex != null)   // possibly replace if died abnormally
    signalWork();
  else
    tryReleaseWaiter();

v.stealHint = w.poolIndex;
if (d != 0)
  signalWork();             // propagate if nonempty
w.execTask(t);