Java ForkJoinPool awaitQuiescence() Method

The awaitQuiescence method of ForkJoinPool class is used to execute the task until this pool is quiescent if called by ForkJoinTask. Otherwise, it assists performing tasks until all the worker threads are idle. The thread which cannot lead a task to execute is called an idle thread.

Syntax:

Parameter:

timeout - the time to wait

unit - the time unit of the timeout argument this can be HOUR, SECONDS, DA, etc.

Returns:

True if quiescent; false if the timeout elapsed.

Throw:

Does not throw Exception.

Example 1

import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.RecursiveTask;
import java.util.concurrent.TimeUnit;
public class JavaForkJoinPoolawaitQuiescenceExample1  {
   public static void main(final String[] arguments) throws InterruptedException
      {
      int proc = Runtime.getRuntime().availableProcessors();
      System.out.println("numbers of core available in your processor:"  +proc);
      
      int[] n = {20 , 23 , 5 ,6 ,7,8,23,12,56,1}; 
      ForkJoinPool Pool = new ForkJoinPool(proc);
      Test t=new Test(n,0,n.length);
      System.out.println("  is Quiescent :" + Pool.awaitQuiescence(2, TimeUnit.SECONDS) );
      ForkJoinPool.commonPool().awaitQuiescence(2, TimeUnit.SECONDS);
      Integer r = Pool.invoke(t);
      System.out.println("Pool.invoke :" +r); 
   }  
}
   class Test extends RecursiveTask<Integer> {
      int st;
      int end;
      int[] arr;
    Test(int[] arr, int st, int end) {
         this.arr = arr;
         this.st  = st;
         this.end  = end;
      }
      protected Integer compute() {
                  if(st - end <= 10) {
            int sum = 0;
               for(int i = st; i < end; ++i) 
               sum += arr[i];
              return sum;
         } else {	    	
            int mid = st + (end - st) / 2;
            Test t1 = new Test(arr, st, mid);
            Test t2 = new Test(arr, st, mid);
            invokeAll(t1 , t2);
             
            return (t1.join() + t2.join());
         }
      }
   }

Test it Now

Output:

numbers of core available in your processor:4
 is Quiescent :true
Pool.invoke :161

Example 2

import java.util.concurrent.ForkJoinPool;
import static java.util.concurrent.ForkJoinTask.invokeAll;
import java.util.concurrent.RecursiveTask;
import java.util.concurrent.TimeUnit;
public class JavaForkJoinPoolawaitQuiescenceExample2 {
   public static void main(final String[] arguments) throws InterruptedException
      {
      int proc = Runtime.getRuntime().availableProcessors();
      System.out.println("numbers of core available in your processor:"  +proc);
      ForkJoinPool Pool = new ForkJoinPool(proc);
      Testt t=new Testt();
      System.out.println("  is awaitQuiescent :" + Pool.awaitQuiescence(2, TimeUnit.SECONDS) );  
   }  
}
   class Testt extends RecursiveTask<Integer> {
    @Override
      protected Integer compute() {
            Testt t1 = new Testt();
            Testt t2 = new Testt();
            invokeAll(t1 , t2);
            return (t1.join() + t2.join());
         }
      }

Test it Now

Output:

numbers of core available in your processor:4
 is awaitQuiescent :true

Next TopicForkjoinpool commonPool()

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