How to use

deregisterWorker

method

in

jsr166y.ForkJoinPool

/**
 * Tries to create and start a worker
 */
private void addWorker() {
  Throwable ex = null;
  ForkJoinWorkerThread wt = null;
  try {
    if ((wt = factory.newThread(this)) != null) {
      wt.start();
      return;
    }
  } catch (Throwable e) {
    ex = e;
  }
  deregisterWorker(wt, ex); // adjust counts etc on failure
}

  /**
   * This method is required to be public, but should never be
   * called explicitly. It performs the main run loop to execute
   * {@link ForkJoinTask}s.
   */
  public void run() {
    Throwable exception = null;
    try {
      onStart();
      pool.runWorker(workQueue);
    } catch (Throwable ex) {
      exception = ex;
    } finally {
      try {
        onTermination(exception);
      } catch (Throwable ex) {
        if (exception == null)
          exception = ex;
      } finally {
        pool.deregisterWorker(this, exception);
      }
    }
  }
}

/**
 * Performs cleanup associated with termination of this worker
 * thread.  If you override this method, you must invoke
 * {@code super.onTermination} at the end of the overridden method.
 *
 * @param exception the exception causing this thread to abort due
 * to an unrecoverable error, or {@code null} if completed normally
 */
protected void onTermination(Throwable exception) {
  try {
    terminate = true;
    cancelTasks();
    pool.deregisterWorker(this, exception);
  } catch (Throwable ex) {        // Shouldn't ever happen
    if (exception == null)      // but if so, at least rethrown
      exception = ex;
  } finally {
    if (exception != null)
      UNSAFE.throwException(exception);
  }
}