Developing Multithreaded Applications

May 31, 20091 like675 views

This document discusses developing multithreaded applications in Java. It covers where multithreading can be useful, such as for non-blocking I/O. It also discusses ways to create threads by extending the Thread class or implementing the Runnable interface. Finally, it discusses the lifecycle of a thread, including starting, terminating, pausing, suspending and resuming threads.

Where multithreading can be useful… Non-blocking I/O The blocking read() method Is blocking nature of read desirable? Shouldn’t I/O be dealt in an asynchronous way? Ways to overcome : - I/O Multiplexing Pooling Alarms & Timers Independent Tasks Think of Parallel processing instead of linear. Parallelizable Algorithms Ex : parallelization of loops.

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Thread-Based Multitasking Threads in a Multithreaded Environment

Ways of Creating a Thread : 2 Extend java.lang.Thread Implement java.lang.Runnable java.lang.Object java.lang.Thread A user-defined class java.lang.Runnable A user-defined class

Extending java.lang.Thread class MyThread extends Thread { public void run() // overriding run { // code that the thread will execute } } ------------------------------------------------ public static void main(String[] args) { Thread t = new MyThread(); t.start(); // creating a thread executing a task parallel to others // code the main thread will execute }

Implementing java.lang.Runnable class MyThread implements Runnable { public void run() // implementing run() { // code to be executed } } --------------------------------- public static void main(String[] args) { Thread t = new Thread(new MyThread(),”Thread2”); t.start(); // Let main thread do something else }

Life-Cycle of a Thread Intermediate States : suspend, waiting/blocking etc.

Let ur thread participate in the race : call start() A thread exists once it has been constructed, but at that point it is not executing any code. The thread is in a waiting state. Thread t = new MyThread(); Once start() is invoked, the thread is said to be alive. Check the state of the thread before & after invoking start(). use isAlive() Other threads can change the attributes of a waiting thread.

Terminating a Thread Normal termination of life-cycle. Abnormal or forced termination Once a thread is started, it call only one method i.e., run(). When it completes run, the thread is said to be terminated. What can cause abnormal termination of a thread? Can run( ) throw a checked exception? How can a thread be forced to terminate?

Pausing, Suspending & Resuming a thread A running thread can be told to pause or resume. main thread Thread t1 I must do the things first, I’m going to suspend t1. t1.suspend(); // main did its work t1.resume(); A running thread can pause its own execution for a specified time using sleep()

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Developing Multithreaded Applications

1. Developing Multithreaded Applications

2. Where multithreading can be useful… Non-blocking I/O The blocking read() method Is blocking nature of read desirable? Shouldn’t I/O be dealt in an asynchronous way? Ways to overcome : - I/O Multiplexing Pooling Alarms & Timers Independent Tasks Think of Parallel processing instead of linear. Parallelizable Algorithms Ex : parallelization of loops.

3. Process-Based Multitasking Processes in a Multitasking Environment

4. Thread-Based Multitasking Threads in a Multithreaded Environment

5. Ways of Creating a Thread : 2 Extend java.lang.Thread Implement java.lang.Runnable java.lang.Object java.lang.Thread A user-defined class java.lang.Runnable A user-defined class

6. Extending java.lang.Thread class MyThread extends Thread { public void run() // overriding run { // code that the thread will execute } } ------------------------------------------------ public static void main(String[] args) { Thread t = new MyThread(); t.start(); // creating a thread executing a task parallel to others // code the main thread will execute }

7. Implementing java.lang.Runnable class MyThread implements Runnable { public void run() // implementing run() { // code to be executed } } --------------------------------- public static void main(String[] args) { Thread t = new Thread(new MyThread(),”Thread2”); t.start(); // Let main thread do something else }

8. Life-Cycle of a Thread Intermediate States : suspend, waiting/blocking etc.

9. Let ur thread participate in the race : call start() A thread exists once it has been constructed, but at that point it is not executing any code. The thread is in a waiting state. Thread t = new MyThread(); Once start() is invoked, the thread is said to be alive. Check the state of the thread before & after invoking start(). use isAlive() Other threads can change the attributes of a waiting thread.

10. Terminating a Thread Normal termination of life-cycle. Abnormal or forced termination Once a thread is started, it call only one method i.e., run(). When it completes run, the thread is said to be terminated. What can cause abnormal termination of a thread? Can run( ) throw a checked exception? How can a thread be forced to terminate?

11. Pausing, Suspending & Resuming a thread A running thread can be told to pause or resume. main thread Thread t1 I must do the things first, I’m going to suspend t1. t1.suspend(); // main did its work t1.resume(); A running thread can pause its own execution for a specified time using sleep()

Developing Multithreaded Applications

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