tips.threads
Class NotifyApp

java.lang.Object
  tips.threads.NotifyApp

class NotifyApp

extends java.lang.Object

Sample class demonstrating the use of notifyAll() on a monitor (any object that uses the synchronized keyword to create a locking section of code). The idea is simple, create one monitor object (inner class Rendezvous) and then 10 threads that each call the Rendezvous function hurryUpAndWait(). hurryUpAndWait() does nothing but wait. When the last thread has been created and all ten are are "waiting" then notifyAll are called and the thread objects print out the order in which they're notified.

Sample output:

Create thread no: 0
Create thread no: 1
Create thread no: 2
Create thread no: 3
Create thread no: 4
Create thread no: 5
Create thread no: 6
Create thread no: 7
Create thread no: 8
Create thread no: 9
Starting the HeadWaiter
Main thread end
Notifying All...
Thread 0 just got notified
Thread 1 just got notified
Thread 2 just got notified
Thread 3 just got notified
Thread 4 just got notified
Thread 5 just got notified
Thread 6 just got notified
Thread 7 just got notified
Thread 8 just got notified
HeadWaiter Start
Head Waiter Notifying All...
Thread 9 just got notified
HeadWaiter end


The sample output demonstrates that the thread get notified in any order and may not get notified at all (hence the need for the HeadWaiter class).

Nested Class Summary

(package private) static class	NotifyApp.Rendezvous Inner Class...
(package private) static class	NotifyApp.Waiter Inner class -

Field Summary

(package private) static int	g_nRootNum
(package private) static int	MAX_THREADS
(package private) static NotifyApp.Rendezvous	rendezvous

Constructor Summary

NotifyApp()
Creates a new instance of NotifyApp

Method Summary

static void

main(java.lang.String[] args)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

MAX_THREADS

static final int MAX_THREADS

See Also:

Constant Field Values

g_nRootNum

static int g_nRootNum

rendezvous

static NotifyApp.Rendezvous rendezvous

Constructor Detail

NotifyApp

public NotifyApp()

Creates a new instance of NotifyApp

Method Detail

main

public static void main(java.lang.String[] args)