Thread model of Java• All the class libraries are designed multithreading in mind• Java uses threads to enable entire system to be asynchronous• Once a thread has been started • It can be suspended • Suspended thread can be resumed • It may be stopped 2
Thread model of Java contd..• Thread features • Creation of threads • Context switch • Thread priorities • Synchronization • Messaging 3
Creation of Threads• Java provides two ways for creating threads by • Extending Thread class • Implementing Runnable interface 4
Context Switch• Switch from one thread to other• Two ways of context switch • Thread can voluntarily relinquish control by • Explicitly yielding • Sleeping • Blocking on pending I/O • Context switch is done by selecting the highest priority thread • Pre-emption • Occurs when a high priority enters while executing a low priority thread 5
Thread Priorities• Thread priorities are simple integers • Ranging from 1 to 10 • A relative measure • Higher the priority – brighter the chances of getting executed first 6
Synchronization• As threads introduces asynchronous behavior in Java programs • Synchronization is needed when two or more threads work with a shared resource • ‘Monitor’ feature is used in Java to implement Synchronization • Monitors are used mutually exclusive 7
Synchronization contd..• There is no special monitor class in Java• Every object has its own implicit monitor• Two ways to show synchronization • synchronized methods • synchronized statements 8
Messaging• Java threads communicate with each other through • notify() method • wait() method 9
SummaryIn this class ,you have learnt• Thread basics • Process • Definition of thread • Comparison of process and thread • Thread model of Java • Features of Java that implemented threads 10
Frequently Asked Questions1. Compare a process and a thread2. Which methods are useful for messaging in Java3. Explain the thread model of Java 11
Quiz1. Which one of the following is a thread ? a) MS-Word b) Windows Explorer c) Spell checker in MS-Word d) Notepad 12
Quiz Contd..2. Which statement is true? a) Thread does not depend on resources of any process b) Each Thread has its own heap memory c) A Thread share heap with other threads d) None
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