use NotifyAll() method.
Regards,
Sunil
On Sat, Dec 11, 2010 at 8:46 PM, anthony <anthonysvalen...@gmail.com> wrote:
> I am trying to send a notify to an available Thread (first Thread i
> can find in a pool currently in a WAITING state), but am unable to. I
> am trying to send the notify alert to a thread running in a separate
> class, although this class is included in the same package. Here is
> the Server.java file from which I am trying to notify my available
> thread:
>
> ***************Server.java***********************
> package dir.test;
>
>
> import java.util.ArrayList;
> import java.util.LinkedList;
>
> public class Server {
> static private final int THREADCOUNT=5;
>
>
> public static void main(String[] args) throws InterruptedException {
> ArrayList<Thread> objThreads = new
> ArrayList<Thread>(THREADCOUNT);
>
> for (int i=0; i<THREADCOUNT; i++) {
> objThreads.add(i, new Thread(new ObjThread(1)));
> objThreads.get(i).start();
> }
>
> try {
> for (int i=0; i<objThreads.size(); i++) {
> if (
> (objThreads.get(i).getState())==Thread.State.WAITING ) {
> System.out.println("Thread " + i + "
> is in state: WAITING.");
> objThreads.get(i).notify();
> System.out.println("Thread " + i + "
> has been notified.");
> }
> }
> } catch (Exception e) {
> e.printStackTrace();
> } catch (Throwable t) {
> System.err.println("Caught throwable t: " + t);
> }
> }
> }
> **********************************************
>
> and here's the ObjThread.java file...
>
> ***************ObjThread.java***********************
> package dir.test;
>
> import java.lang.Runnable;
> import java.util.*;
>
>
> public class ObjThread implements Runnable {
> private int int_var;
>
> public ObjThread(int int_var) {
> this.int_var = int_var;
> }
>
> public synchronized void run() {
> while ( true ) {
> try {
> System.out.println("test...before wait");
> wait();
> System.out.println("test...after wait. int
> variable value: " +
> int_var);
> } catch ( InterruptedException e ) { }
> }
> }
> }
> **********************************************
>
>
> The thread never gets to the statement:
> System.out.println("test...after wait. int variable value: " +
> int_var);
>
> My output is:
> $ java dir.test.Server
> test...before wait
> test...before wait
> test...before wait
> test...before wait
> test...before wait
> Thread 0 is in state: WAITING.
> java.lang.IllegalMonitorStateException
> at java.lang.Object.notify(Native Method)
> at cscie160.test.Server.main(Server.java:23)
>
>
> Any idea how I can wake a thread from a WAITING state with this file
> structure so it can resume it's work?
>
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