Quiz on Tuesday April 13. CS 361 Concurrent programming Drexel University Fall 2004 Lecture 4. Java facts and questions. Things to try in Java
|
|
- Erik Stone
- 6 years ago
- Views:
Transcription
1 CS 361 Concurrent programming Drexel University Fall 2004 Lecture 4 Bruce Char and Vera Zaychik. All rights reserved by the author. Permission is given to students enrolled in CS361 Fall 2004 to reproduce these notes for their own use. page 1 Quiz on Tuesday April minutes or less. Write a simple Java program with computation and i/o (no threads). You should be able to do any kind of simple program you could write in Programming II or Data Structures in C++, but in Java. Be able to state information and answer simple questions about Java compilation, classpaths, packages. If you did the first example assignment easily, there should be no problems if you can express page 2 what you know Things to try in Java Write a program that uses inheritance, interfaces, Vectors, file I/O, packages. Study AWT and Java Swing to find out how to use the Java class libraries for GUI construction. Our Java programming won t need it, however. Java facts and questions How do you handle global variables in Java? Java has automatic garbage collection -- do new() to allocate, but never need to do delete. What implications does automatic gc have for programming? page 3 page 4 Forcing a deallocation of storage int big_array[100000]; Another Java fact and question How do you do a linked list in Java? // now we don t want to use the storage anymore big_array = null; // garbage collector // automatically deallocates storage from the // heap. page 5 page 6
2 Java procedures are mainly call by reference This means that procedures can easily alter objects passed to them as parameters. Building your own exceptions. Class BrucesArgumentNegativeException extends Exception{; page 7 page 8 Programming with exceptions. class Factorial{ Public static int compute(int k) throws BrucesArgumentNegativeException, other exceptions { if (k<0) throw new BrucesArgumentNegativeException(); else return 1; (and later in a program). try { System.out.println ( answer is: + Factorial.compute(n)); catch(brucesargumentnegativeexception e) { System.err.println(e + oops ); continue; ;. Java lacks some C++ features No templates. But superclass is Object. Could program a stack class with Objects, and then cast into an object of another class. Exception: primitive data types such as int, float are not subclasses of Object. However, there are wrapper classes Integer, Double, etc. No overloading of operators (although function overloading is okay). No i/o operators <<, >>. No general multiple inheritance. page 9 page 10 No environment variables in Java (not system independent) No such thing as environment variables as there are with C/C++ and Unix because this is not OS independent. There s a system property setting mechanism that accesses properties declared in the command line invocation called System.getProperty() read about it in the Java documentation. What does final mean? public final class FinalCircle extends GraphicCircle { When a class is declared with the final modifier, it means that it cannot be extended. It s a way of declaring constants for a class: final int BUFFERSIZE = 10; page 11 page 12
3 page 13 Java threads Use the built-in Thread class in Java. You need to supply the programming that the thread will follow in order to do multi-threaded programming. There are two ways to get a new thread in Java Extend (subclass) the Thread class. Provide a run method in the subclass. Create a Thread object incorporating an object that specifies the Thread s run method. One way to get a thread: extend (subclass) the built-in Thread class In file AThread.java: class AThread extends Thread { public AThread(String name) {super(name); public void run() { System.out.println( My name is + getname()); In file test.java: class test { public static void main(string[] args) { AThread a = new AThread( mud ); // Thread name a.start(); page 14 page 15 Thread Construction Different Thread constructors accept combinations of arguments supplying: A Runnable object, in which case Thread.start invokes run of the supplied Runnable object A String that serves as an identifier. Not useful except for tracing and debugging ThreadGroup in which the new Thread should be placed An alternative: implement Runnable interface, use another form of the Thread constructor In file AClass.java: class AClass implements Runnable { public void run() { System.out.println( My name is + Thread.currentThread().getName()); In file test2.java: class test { public static void main(string[] args){ AClass aobject = new AClass(); // Use alternative constructor for Thread class Thread athread = new Thread(aObject, mud, too ); // Thread name athread.start(); page 16 Extend (inherit) Thread versus implement Runnable The implementing Runnable technique allows you to extend another class as well as getting threads. Since Java does not have full multiple inheritance, you can t do that with the first method. Starting threads Invoking its start method causes an instance of class Thread to initiate its run method A Thread terminates when its run method completes by either returning normally or throwing an unchecked exception Threads are not restartable, even after they terminate isalive returns true if a thread has been started by not has not terminated page 17 page 18
4 Thread States and Scheduling A Java thread can be in new, runnable, running, blocked, and dead states. The Threads class has methods that move the thread from one state to another. Thread states New state a Thread newly created. Runnable after being started, the Thread can be run. It is put into the run queue of Threads and waits its turn to run. Runnable does not mean running. Running the thread is executing its code. On a uniprocessor machine, at most one thread can run at a time. page 19 page 20 Thread/process states More thread states start yield stop sleep/suspend resume 0 1 stop/end 2 run 3 suspend 4 stop dispatch stop 1 terminated 2 running 3 suspended 4 - runnable page 21 Blocked the thread is waiting for something to happen It is waiting for an i/o operation it is executing to complete It has been told to sleep for a specified period of time through the sleep method It has executed the wait() method and will block until another thread executes a notify() or notifyall() method. It will return to runnable state after sleeping, notifying, etc. page 22 page 23 More thread states Terminated The final state. After reaching this state the Thread can no longer execute. A thread can reach this state after the run method is finished, or by something executing its stop() method. Threads can kill themselves, or a thread can kill another thread. page 24 The run queue of runnable threads The Java language specification does not specify how Java is supposed to choose the thread to run if there are several runnable threads of equal priority. One possibility pick a thread and run it until it completes, or until it executes a method that causes it to move into a non-running state. Another possibility time slicing : pick a thread and run it for a short period of time. Then, if it is not finished, suspend it and pick another thread to run for the same period of time.
5 page 25 The semantics of yield() public static void yield() Causes the currently executing thread object to temporarily pause and allow other threads to execute. Java Language Reference: In some cases, a large number of threads could be waiting on the currently running thread to finish executing before they can start executing. To make the thread scheduler switch from the current running thread to allow others to execute, call the yield() method on the current thread. In order for yield() to work, there must be at least one thread with an equal or higher priority than the current thread.. Java realities Most implementations of Java typically use time-slicing In older Java versions on Solaris the default was to use green threads, which meant that there was no time-slicing. (many-to-one thread model) Currently Solaris uses native threads (many-to-many thread model) page 26 Thread synchronization Thread synchronization, con t t.wait() blocks until t.notify() method is called. t.suspend() puts it into suspended state. t.resume() makes it runnable again. suspend and resume are deprecated methods, do not use. A deprecated method is one whose design has fallen out of favor and may be unsupported in page 27 page 28 future Java versions stop() is also a deprecated method, avoid its use in your programming. Most of the time you should let a thread finish by having it conclude executing its run() method. stop() causes an untidy conclusion to a thread, which may disrupt correct operation of other threads which may continue to run after the stopped thread. page 29 More Thread methods Thread.currentThread returns a reference to the current Thread Thread.sleep(long msecs) causes the current thread to suspend for at least msecs milliseconds Thread.interrupt is the preferred method for stopping a thread (not Thread.stop) page 30 Thread Priorities With multiple threads, one can assign priorities ( a number) to each thread, and run the ones with highest priority. t.setpriority(int). In some versions of Solaris multiple threads with the same priority have no time-slicing. The book provides a class library that implements time slicing on Solaris. You import it and then do new Scheduler(time slice amount); This course discusses techniques that avoid the use of priorities in establishing synchronization between threads.
6 page 31 Priorities Each Thread has a priority, between Thread.MIN_PRIORITY and Thread.MAX_PRIORITY (from 1 to 10) Each new thread has the same priority as the thread that created it The initial thread associated with a main by default has priority Thread.NORM_PRIORITY (5) getpriority gets current Thread priority, setpriority sets priority Why you should not try to achieve correctness in concurrency problems using priorities A scheduler is generally biased to prefer running threads with higher priorities (depends on JVM implementation), but there is no iron-clad guarantee that a thread with a higher priority must run instead of that with a lower priority. There are only a small number of different priorities. If you have a problem with many threads you will run out of distinct priorities to assign threads. page 32 page 33 Concurrent programming goals Your job is to write a program that will work correctly regardless of whether there is timeslicing or not. The thread s programming should use synchronization methods such as semaphores or wait() and notify(); to make sure that a particular thread relinquishes execution if that is needed to for correct operation. Avoid stop(), suspend(), resume(), destroy(). Priorities often used as a crutch; the algorithm may not scale up to more threads if you have more threads than priority levels. page 34 Java debugging with multithreaded programs See what book has to say about it use print statements, mainly, and dump output of each thread into a separate file or at least with distinctive output. jdb is a Java debugger that allows you to start/stop individual threads. Hard to control concurrent execution of threads to reproduce a bug in a debugger. Race conditions What is a race condition? When two threads or processes sharing memory write and read simultaneously, with the effect that the work that one or the other is doing gets lost. Example N=N+1; in assembly this is load value of N into register R, ad one to register, store value of R back into memory location for N. Problems with N=N+1 race If two threads did this, we could end up with either N+2 or N+1 depending on whether their operations were interleaved or not. page 35 page 36
7 Other situations A husband and wife work in different places. At lunch they both go visit an ATM to withdraw money. If they withdraw simultaneously, what would a race condition do to their bank balance? page 37
7. MULTITHREDED PROGRAMMING
7. MULTITHREDED PROGRAMMING What is thread? A thread is a single sequential flow of control within a program. Thread is a path of the execution in a program. Muti-Threading: Executing more than one thread
More informationThreads in Java (Deitel & Deitel)
Threads in Java (Deitel & Deitel) OOutline 1 Introduction 1 Class Thread: An Overview of the Thread Methods 1 Thread States: Life Cycle of a Thread 1 Thread Priorities and Thread Scheduling 1 Thread Synchronization
More informationPerformance Throughput Utilization of system resources
Concurrency 1. Why concurrent programming?... 2 2. Evolution... 2 3. Definitions... 3 4. Concurrent languages... 5 5. Problems with concurrency... 6 6. Process Interactions... 7 7. Low-level Concurrency
More informationCS360 Lecture 10 Multithreading
Tuesday, March 9, 2004 Reading Exception Handling: Chapter 15 Multithreading: Chapter 16 CS360 Lecture 10 Multithreading Declaring New Exception Types Most programmers use existing exception classes from
More information15CS45 : OBJECT ORIENTED CONCEPTS
15CS45 : OBJECT ORIENTED CONCEPTS QUESTION BANK: What do you know about Java? What are the supported platforms by Java Programming Language? List any five features of Java? Why is Java Architectural Neutral?
More informationThreads Questions Important Questions
Threads Questions Important Questions https://dzone.com/articles/threads-top-80-interview https://www.journaldev.com/1162/java-multithreading-concurrency-interviewquestions-answers https://www.javatpoint.com/java-multithreading-interview-questions
More informationCOURSE 11 PROGRAMMING III OOP. JAVA LANGUAGE
COURSE 11 PROGRAMMING III OOP. JAVA LANGUAGE PREVIOUS COURSE CONTENT Input/Output Streams Text Files Byte Files RandomAcessFile Exceptions Serialization NIO COURSE CONTENT Threads Threads lifecycle Thread
More informationMultithread Computing
Multithread Computing About This Lecture Purpose To learn multithread programming in Java What You Will Learn ¾ Benefits of multithreading ¾ Class Thread and interface Runnable ¾ Thread methods and thread
More informationMidterm on next week Tuesday May 4. CS 361 Concurrent programming Drexel University Fall 2004 Lecture 9
CS 361 Concurrent programming Drexel University Fall 2004 Lecture 9 Bruce Char and Vera Zaychik. All rights reserved by the author. Permission is given to students enrolled in CS361 Fall 2004 to reproduce
More informationObject Oriented Programming. Week 10 Part 1 Threads
Object Oriented Programming Week 10 Part 1 Threads Lecture Concurrency, Multitasking, Process and Threads Thread Priority and State Java Multithreading Extending the Thread Class Defining a Class that
More informationPre- and post- CS protocols. CS 361 Concurrent programming Drexel University Fall 2004 Lecture 7. Other requirements for a mutual exclusion algorithm
CS 361 Concurrent programming Drexel University Fall 2004 Lecture 7 Bruce Char and Vera Zaychik. All rights reserved by the author. Permission is given to students enrolled in CS361 Fall 2004 to reproduce
More informationMultiThreading 07/01/2013. Session objectives. Introduction. Introduction. Advanced Java Programming Course
Advanced Java Programming Course MultiThreading By Võ Văn Hải Faculty of Information Technologies Industrial University of Ho Chi Minh City Session objectives Introduction Creating thread Thread class
More informationCS360 Lecture 12 Multithreading
CS360 Lecture 12 Multithreading Thursday, March 11, 2004 Reading Multithreading: Chapter 16 Thread States At any time, a thread can be in one of several thread states: - Born: this is the time when the
More informationAdvanced Java Programming Course. MultiThreading. By Võ Văn Hải Faculty of Information Technologies Industrial University of Ho Chi Minh City
Advanced Java Programming Course MultiThreading By Võ Văn Hải Faculty of Information Technologies Industrial University of Ho Chi Minh City Session objectives Introduction Creating thread Thread class
More informationJava Threads. Written by John Bell for CS 342, Spring 2018
Java Threads Written by John Bell for CS 342, Spring 2018 Based on chapter 9 of Learning Java, Fourth Edition by Niemeyer and Leuck, and other sources. Processes A process is an instance of a running program.
More informationJava Threads. COMP 585 Noteset #2 1
Java Threads The topic of threads overlaps the boundary between software development and operation systems. Words like process, task, and thread may mean different things depending on the author and the
More informationCS/B.TECH/CSE(OLD)/SEM-6/CS-605/2012 OBJECT ORIENTED PROGRAMMING. Time Allotted : 3 Hours Full Marks : 70
CS/B.TECH/CSE(OLD)/SEM-6/CS-605/2012 2012 OBJECT ORIENTED PROGRAMMING Time Allotted : 3 Hours Full Marks : 70 The figures in the margin indicate full marks. Candidates are required to give their answers
More informationSynchronization
Synchronization 10-28-2013 Synchronization Coming next: Multithreading in JavaFX (javafx.concurrent) Read: Java Tutorial on concurrency JavaFX Tutorial on concurrency Effective Java, Chapter 9 Project#1:
More informationObject Oriented Programming (II-Year CSE II-Sem-R09)
(II-Year CSE II-Sem-R09) Unit-VI Prepared By: A.SHARATH KUMAR M.Tech Asst. Professor JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY, HYDERABAD. (Kukatpally, Hyderabad) Multithreading A thread is a single sequential
More informationComputation Abstractions. Processes vs. Threads. So, What Is a Thread? CMSC 433 Programming Language Technologies and Paradigms Spring 2007
CMSC 433 Programming Language Technologies and Paradigms Spring 2007 Threads and Synchronization May 8, 2007 Computation Abstractions t1 t1 t4 t2 t1 t2 t5 t3 p1 p2 p3 p4 CPU 1 CPU 2 A computer Processes
More informationMultithreading in Java Part 2 Thread - States JAVA9S.com
Multithreading in Java Part 2 Thread - States By, Srinivas Reddy.S When start() method is invoked on thread It is said to be in Runnable state. But it is not actually executing the run method. It is ready
More informationChapter 32 Multithreading and Parallel Programming
Chapter 32 Multithreading and Parallel Programming 1 Objectives To get an overview of multithreading ( 32.2). To develop task classes by implementing the Runnable interface ( 32.3). To create threads to
More informationJAVA and J2EE UNIT - 4 Multithreaded Programming And Event Handling
JAVA and J2EE UNIT - 4 Multithreaded Programming And Event Handling Multithreaded Programming Topics Multi Threaded Programming What are threads? How to make the classes threadable; Extending threads;
More informationNote: Each loop has 5 iterations in the ThreeLoopTest program.
Lecture 23 Multithreading Introduction Multithreading is the ability to do multiple things at once with in the same application. It provides finer granularity of concurrency. A thread sometimes called
More informationUnit III Rupali Sherekar 2017
Unit III Exceptions An exception is an abnormal condition that arises in a code sequence at run time. In other words, an exception is a run-time error. In computer languages that do not support exception
More informationMultithreaded Programming
core programming Multithreaded Programming 1 2001-2003 Marty Hall, Larry Brown http:// 2 Multithreaded Programming Agenda Why threads? Approaches for starting threads Separate class approach Callback approach
More informationOverview. Processes vs. Threads. Computation Abstractions. CMSC 433, Fall Michael Hicks 1
CMSC 433 Programming Language Technologies and Paradigms Spring 2003 Threads and Synchronization April 1, 2003 Overview What are threads? Thread scheduling, data races, and synchronization Thread mechanisms
More informationAdvanced Concepts of Programming
Berne University of Applied Sciences E. Benoist / E. Dubuis January 2005 1 Multithreading in Java Java provides the programmer with built-in threading capabilities The programmer can create and manipulate
More informationConcurrent Programming using Threads
Concurrent Programming using Threads Threads are a control mechanism that enable you to write concurrent programs. You can think of a thread in an object-oriented language as a special kind of system object
More informationCMSC 132: Object-Oriented Programming II. Threads in Java
CMSC 132: Object-Oriented Programming II Threads in Java 1 Problem Multiple tasks for computer Draw & display images on screen Check keyboard & mouse input Send & receive data on network Read & write files
More informationCompaq Interview Questions And Answers
Part A: Q1. What are the difference between java and C++? Java adopts byte code whereas C++ does not C++ supports destructor whereas java does not support. Multiple inheritance possible in C++ but not
More informationConcurrent Programming
Concurrency Concurrent Programming A sequential program has a single thread of control. Its execution is called a process. A concurrent program has multiple threads of control. They may be executed as
More informationTHREADS AND CONCURRENCY
THREADS AND CONCURRENCY Lecture 22 CS2110 Spring 2013 Graphs summary 2 Dijkstra: given a vertex v, finds shortest path from v to x for each vertex x in the graph Key idea: maintain a 5-part invariant on
More informationContents. G53SRP: Java Threads. Definition. Why we need it. A Simple Embedded System. Why we need it. Java Threads 24/09/2009 G53SRP 1 ADC
Contents G53SRP: Java Threads Chris Greenhalgh School of Computer Science 1 Definition Motivations Threads Java threads Example embedded process Java Thread API & issues Exercises Book: Wellings 1.1 &
More informationB2.52-R3: INTRODUCTION TO OBJECT ORIENTATED PROGRAMMING THROUGH JAVA
B2.52-R3: INTRODUCTION TO OBJECT ORIENTATED PROGRAMMING THROUGH JAVA NOTE: 1. There are TWO PARTS in this Module/Paper. PART ONE contains FOUR questions and PART TWO contains FIVE questions. 2. PART ONE
More informationG52CON: Concepts of Concurrency
G52CON: Concepts of Concurrency Lecture 2 Processes & Threads Natasha Alechina School of Computer Science nza@cs.nott.ac.uk Outline of this lecture Java implementations of concurrency process and threads
More informationProgrammazione Avanzata e Paradigmi Ingegneria e Scienze Informatiche - UNIBO a.a 2013/2014 Lecturer: Alessandro Ricci
v1.0 20130323 Programmazione Avanzata e Paradigmi Ingegneria e Scienze Informatiche - UNIBO a.a 2013/2014 Lecturer: Alessandro Ricci [module lab 2.1] CONCURRENT PROGRAMMING IN JAVA: INTRODUCTION 1 CONCURRENT
More informationDOWNLOAD PDF CORE JAVA APTITUDE QUESTIONS AND ANSWERS
Chapter 1 : Chapter-wise Java Multiple Choice Questions and Answers Interview MCQs Java Programming questions and answers with explanation for interview, competitive examination and entrance test. Fully
More information27/04/2012. We re going to build Multithreading Application. Objectives. MultiThreading. Multithreading Applications. What are Threads?
Objectives MultiThreading What are Threads? Interrupting threads Thread properties By Võ Văn Hải Faculty of Information Technologies Summer 2012 Threads priorities Synchronization Callables and Futures
More informationThreads Chate Patanothai
Threads Chate Patanothai Objectives Knowing thread: 3W1H Create separate threads Control the execution of a thread Communicate between threads Protect shared data C. Patanothai Threads 2 What are threads?
More informationUnit - IV Multi-Threading
Unit - IV Multi-Threading 1 Uni Processing In the early days of computer only one program will occupy the memory. The second program must be in waiting. The second program will be entered whenever first
More informationContents. 6-1 Copyright (c) N. Afshartous
Contents 1. Classes and Objects 2. Inheritance 3. Interfaces 4. Exceptions and Error Handling 5. Intro to Concurrency 6. Concurrency in Java 7. Graphics and Animation 8. Applets 6-1 Copyright (c) 1999-2004
More informationCHETTINAD COLLEGE OF ENGINEERING & TECHNOLOGY JAVA
1. JIT meaning a. java in time b. just in time c. join in time d. none of above CHETTINAD COLLEGE OF ENGINEERING & TECHNOLOGY JAVA 2. After the compilation of the java source code, which file is created
More informationMultithreaded Programming
Multithreaded Programming Multithreaded programming basics Concurrency is the ability to run multiple parts of the program in parallel. In Concurrent programming, there are two units of execution: Processes
More informationCS 231 Data Structures and Algorithms, Fall 2016
CS 231 Data Structures and Algorithms, Fall 2016 Dr. Bruce A. Maxwell Department of Computer Science Colby College Course Description Focuses on the common structures used to store data and the standard
More informationCS455: Introduction to Distributed Systems [Spring 2019] Dept. Of Computer Science, Colorado State University
CS 455: INTRODUCTION TO DISTRIBUTED SYSTEMS [THREADS] The House of Heap and Stacks Stacks clean up after themselves But over deep recursions they fret The cheerful heap has nary a care Harboring memory
More informationPESIT Bangalore South Campus
PESIT Bangalore South Campus 15CS45 : OBJECT ORIENTED CONCEPTS Faculty : Prof. Sajeevan K, Prof. Hanumanth Pujar Course Description: No of Sessions: 56 This course introduces computer programming using
More informationIntroduction to Programming Using Java (98-388)
Introduction to Programming Using Java (98-388) Understand Java fundamentals Describe the use of main in a Java application Signature of main, why it is static; how to consume an instance of your own class;
More informationMulti-threading in Java. Jeff HUANG
Multi-threading in Java Jeff HUANG Software Engineering Group @HKUST Do you use them? 2 Do u know their internals? 3 Let s see File DB How can they service so many clients simultaneously? l 4 Multi-threading
More informationThe Sun s Java Certification and its Possible Role in the Joint Teaching Material
The Sun s Java Certification and its Possible Role in the Joint Teaching Material Nataša Ibrajter Faculty of Science Department of Mathematics and Informatics Novi Sad 1 Contents Kinds of Sun Certified
More informationProcess Characteristics. Threads Chapter 4. Process Characteristics. Multithreading vs. Single threading
Process Characteristics Threads Chapter 4 Reading: 4.1,4.4, 4.5 Unit of resource ownership - process is allocated: a virtual address space to hold the process image control of some resources (files, I/O
More informationThreads Chapter 4. Reading: 4.1,4.4, 4.5
Threads Chapter 4 Reading: 4.1,4.4, 4.5 1 Process Characteristics Unit of resource ownership - process is allocated: a virtual address space to hold the process image control of some resources (files,
More informationCS 455: INTRODUCTION TO DISTRIBUTED SYSTEMS [THREADS] Frequently asked questions from the previous class survey
CS 455: INTRODUCTION TO DISTRIBUTED SYSTEMS [THREADS] Shrideep Pallickara Computer Science Colorado State University L6.1 Frequently asked questions from the previous class survey L6.2 SLIDES CREATED BY:
More informationTHREADS & CONCURRENCY
27/04/2018 Sorry for the delay in getting slides for today 2 Another reason for the delay: Yesterday: 63 posts on the course Piazza yesterday. A7: If you received 100 for correctness (perhaps minus a late
More informationChapter 19 Multithreading
Chapter 19 Multithreading Prerequisites for Part VI Chapter 14 Applets, Images, and Audio Chapter 19 Multithreading Chapter 20 Internationalization 1 Objectives To understand the concept of multithreading
More informationEMBEDDED SYSTEMS PROGRAMMING More About Languages
EMBEDDED SYSTEMS PROGRAMMING 2015-16 More About Languages JAVA: ANNOTATIONS (1/2) Structured comments to source code (=metadata). They provide data about the code, but they are not part of the code itself
More informationAmity School of Engineering
Amity School of Engineering B.Tech., CSE(5 th Semester) Java Programming Topic: Multithreading ANIL SAROLIYA 1 Multitasking and Multithreading Multitasking refers to a computer's ability to perform multiple
More informationCMSC 433 Programming Language Technologies and Paradigms. Concurrency
CMSC 433 Programming Language Technologies and Paradigms Concurrency What is Concurrency? Simple definition Sequential programs have one thread of control Concurrent programs have many Concurrency vs.
More informationUnit 4. Thread class & Runnable Interface. Inter Thread Communication
Unit 4 Thread class & Runnable Interface. Inter Thread Communication 1 Multithreaded Programming Java provides built-in support for multithreaded programming. A multithreaded program contains two or more
More informationCIS233J Java Programming II. Threads
CIS233J Java Programming II Threads Introduction The purpose of this document is to introduce the basic concepts about threads (also know as concurrency.) Definition of a Thread A thread is a single sequential
More informationConcurrency in Object Oriented Programs 1. Object-Oriented Software Development COMP4001 CSE UNSW Sydney Lecturer: John Potter
Concurrency in Object Oriented Programs 1 Object-Oriented Software Development COMP4001 CSE UNSW Sydney Lecturer: John Potter Outline Concurrency: the Future of Computing Java Concurrency Thread Safety
More informationCISC 4700 L01 Network & Client-Server Programming Spring Cowell Chapter 15: Writing Threaded Applications
CISC 4700 L01 Network & Client-Server Programming Spring 2016 Cowell Chapter 15: Writing Threaded Applications Idea: application does simultaneous activities. Example: web browsers download text and graphics
More informationUNIT IV MULTITHREADING AND GENERIC PROGRAMMING
UNIT IV MULTITHREADING AND GENERIC PROGRAMMING Differences between multithreading and multitasking, thread life cycle, creating threads, creating threads, synchronizing threads, Inter-thread communication,
More informationThreads. Definitions. Process Creation. Process. Thread Example. Thread. From Volume II
Definitions A glossary Threads From Volume II Copyright 1998-2002 Delroy A. Brinkerhoff. All Rights Reserved. Threads Slide 1 of 30 PMultitasking: (concurrent ramming, multiramming) the illusion of running
More informationPoints To Remember for SCJP
Points To Remember for SCJP www.techfaq360.com The datatype in a switch statement must be convertible to int, i.e., only byte, short, char and int can be used in a switch statement, and the range of the
More informationWhat is a thread anyway?
Concurrency in Java What is a thread anyway? Smallest sequence of instructions that can be managed independently by a scheduler There can be multiple threads within a process Threads can execute concurrently
More informationThreads. Still Chapter 2 (Based on Silberchatz s text and Nachos Roadmap.) 3/9/2003 B.Ramamurthy 1
Threads Still Chapter 2 (Based on Silberchatz s text and Nachos Roadmap.) 3/9/2003 B.Ramamurthy 1 Single and Multithreaded Processes Thread specific Data (TSD) Code 3/9/2003 B.Ramamurthy 2 User Threads
More informationJava Fundamentals p. 1 The Origins of Java p. 2 How Java Relates to C and C++ p. 3 How Java Relates to C# p. 4 Java's Contribution to the Internet p.
Preface p. xix Java Fundamentals p. 1 The Origins of Java p. 2 How Java Relates to C and C++ p. 3 How Java Relates to C# p. 4 Java's Contribution to the Internet p. 5 Java Applets and Applications p. 5
More informationJava s Implementation of Concurrency, and how to use it in our applications.
Java s Implementation of Concurrency, and how to use it in our applications. 1 An application running on a single CPU often appears to perform many tasks at the same time. For example, a streaming audio/video
More informationCore Java - SCJP. Q2Technologies, Rajajinagar. Course content
Core Java - SCJP Course content NOTE: For exam objectives refer to the SCJP 1.6 objectives. 1. Declarations and Access Control Java Refresher Identifiers & JavaBeans Legal Identifiers. Sun's Java Code
More informationConcurrency & Parallelism. Threads, Concurrency, and Parallelism. Multicore Processors 11/7/17
Concurrency & Parallelism So far, our programs have been sequential: they do one thing after another, one thing at a. Let s start writing programs that do more than one thing at at a. Threads, Concurrency,
More informationConcurrency in Java Prof. Stephen A. Edwards
Concurrency in Java Prof. Stephen A. Edwards The Java Language Developed by James Gosling et al. at Sun Microsystems in the early 1990s Originally called Oak, first intended application was as an OS for
More informationSUMMARY INTRODUCTION CONCURRENT PROGRAMMING THREAD S BASICS. Introduction Thread basics. Thread states. Sequence diagrams
SUMMARY CONCURRENT PROGRAMMING THREAD S BASICS PROGRAMMAZIONE CONCORRENTE E DISTR. Introduction Thread basics Thread properties Thread states Thread interruption Sequence diagrams Università degli Studi
More informationAdvanced Programming Methods. Lecture 6 - Concurrency in Java (1)
Advanced Programming Methods Lecture 6 - Concurrency in Java (1) Overview Introduction Java threads Java.util.concurrent References NOTE: The slides are based on the following free tutorials. You may want
More informationCSE P 501 Compilers. Java Implementation JVMs, JITs &c Hal Perkins Winter /11/ Hal Perkins & UW CSE V-1
CSE P 501 Compilers Java Implementation JVMs, JITs &c Hal Perkins Winter 2008 3/11/2008 2002-08 Hal Perkins & UW CSE V-1 Agenda Java virtual machine architecture.class files Class loading Execution engines
More informationModule - 4 Multi-Threaded Programming
Terminologies Module - 4 Multi-Threaded Programming Process: A program under execution is called as process. Thread: A smallest component of a process that can be executed independently. OR A thread is
More informationThreads, Concurrency, and Parallelism
Threads, Concurrency, and Parallelism Lecture 24 CS2110 Spring 2017 Concurrency & Parallelism So far, our programs have been sequential: they do one thing after another, one thing at a time. Let s start
More informationConcurrent Computing CSCI 201 Principles of Software Development
Concurrent Computing CSCI 201 Principles of Software Development Jeffrey Miller, Ph.D. jeffrey.miller@usc.edu Outline Threads Multi-Threaded Code CPU Scheduling Program USC CSCI 201L Thread Overview Looking
More informationThreads & Concurrency
2 Due date of A7 Due d About A5-A6 We have changed the due date of A7 Friday, 28 April. Threads & Concurrency But the last date to submit A7 remains the same: 29 April. We make the last date be 29 April
More informationCSCD 330 Network Programming
CSCD 330 Network Programming Lecture 12 More Client-Server Programming Winter 2016 Reading: References at end of Lecture 1 Introduction So far, Looked at client-server programs with Java Sockets TCP and
More informationThreads & Timers. CSE260, Computer Science B: Honors Stony Brook University
Threads & Timers CSE260, Computer Science B: Honors Stony Brook University http://www.cs.stonybrook.edu/~cse260 Multi-tasking When you re working, how many different applications do you have open at one
More informationHandling Multithreading Approach Using Java Nikita Goel, Vijaya Laxmi, Ankur Saxena Amity University Sector-125, Noida UP India
RESEARCH ARTICLE Handling Multithreading Approach Using Java Nikita Goel, Vijaya Laxmi, Ankur Saxena Amity University Sector-125, Noida UP-201303 - India OPEN ACCESS ABSTRACT This paper contains information
More informationModern Programming Languages. Lecture Java Programming Language. An Introduction
Modern Programming Languages Lecture 27-30 Java Programming Language An Introduction 107 Java was developed at Sun in the early 1990s and is based on C++. It looks very similar to C++ but it is significantly
More informationAnimation Part 2: MoveableShape interface & Multithreading
Animation Part 2: MoveableShape interface & Multithreading MoveableShape Interface In the previous example, an image was drawn, then redrawn in another location Since the actions described above can apply
More informationProgramming. Syntax and Semantics
Programming For the next ten weeks you will learn basic programming principles There is much more to programming than knowing a programming language When programming you need to use a tool, in this case
More informationDealing with Issues for Interprocess Communication
Dealing with Issues for Interprocess Communication Ref Section 2.3 Tanenbaum 7.1 Overview Processes frequently need to communicate with other processes. In a shell pipe the o/p of one process is passed
More informationJava Programming. Price $ (inc GST)
1800 ULEARN (853 276) www.ddls.com.au Java Programming Length 5 days Price $4235.00 (inc GST) Overview Intensive and hands-on, the course emphasizes becoming productive quickly as a Java application developer.
More informationProcesses and Threads
TDDI04 Concurrent Programming, Operating Systems, and Real-time Operating Systems Processes and Threads [SGG7] Chapters 3 and 4 Copyright Notice: The lecture notes are mainly based on Silberschatz s, Galvin
More informationReintroduction to Concurrency
Reintroduction to Concurrency The execution of a concurrent program consists of multiple processes active at the same time. 9/25/14 7 Dining philosophers problem Each philosopher spends some time thinking
More informationCSCD 330 Network Programming
CSCD 330 Network Programming Lecture 12 More Client-Server Programming Winter 2019 Reading: References at end of Lecture 1 Introduction So far, Looked at client-server programs with Java Sockets TCP and
More informationOutline. Threads. Single and Multithreaded Processes. Benefits of Threads. Eike Ritter 1. Modified: October 16, 2012
Eike Ritter 1 Modified: October 16, 2012 Lecture 8: Operating Systems with C/C++ School of Computer Science, University of Birmingham, UK 1 Based on material by Matt Smart and Nick Blundell Outline 1 Concurrent
More informationLecture 7 Java SE Multithreading
Lecture 7 Java SE Multithreading presentation Java Programming Software App Development Cristian Toma D.I.C.E/D.E.I.C Department of Economic Informatics & Cybernetics www.dice.ase.ro Cristian Toma Business
More informationCOMP31212: Concurrency A Review of Java Concurrency. Giles Reger
COMP31212: Concurrency A Review of Java Concurrency Giles Reger Outline What are Java Threads? In Java, concurrency is achieved by Threads A Java Thread object is just an object on the heap, like any other
More informationThreads. 3 Two-Minute Drill. Certification Objectives. Q&A Self Test. Start New Threads. Write Code That Uses wait(), notify(), or notifyall()
9 Threads Certification Objectives l l l Start New Threads Recognize Thread States and Transitions Use Object Locking to Avoid Concurrent Access l Write Code That Uses wait(), notify(), or notifyall()
More information1 OBJECT-ORIENTED PROGRAMMING 1
PREFACE xvii 1 OBJECT-ORIENTED PROGRAMMING 1 1.1 Object-Oriented and Procedural Programming 2 Top-Down Design and Procedural Programming, 3 Problems with Top-Down Design, 3 Classes and Objects, 4 Fields
More informationFigure 6.1 System layers
Figure 6.1 System layers Applications, services Middleware OS: kernel, libraries & servers OS1 Processes, threads, communication,... OS2 Processes, threads, communication,... Platform Computer & network
More informationMultitasking Multitasking allows several activities to occur concurrently on the computer. A distinction is usually made between: Process-based multit
Threads Multitasking Multitasking allows several activities to occur concurrently on the computer. A distinction is usually made between: Process-based multitasking Thread-based multitasking Multitasking
More informationMemory system behavior: volatile variables. CS 361 Concurrent programming Drexel University Fall 2004 Lecture 6. Volatile variables and concurrency
CS 361 Concurrent programming Dreel University Fall 2004 Lecture 6 Bruce Char and Vera Zaychik. All rights reserved by the author. Permission is given to students enrolled in CS361 Fall 2004 to reproduce
More informationLe L c e t c ur u e e 7 To T p o i p c i s c t o o b e b e co c v o e v r e ed e Multithreading
Course Name: Advanced Java Lecture 7 Topics to be covered Multithreading Thread--An Introduction Thread A thread is defined as the path of execution of a program. It is a sequence of instructions that
More informationSpecial Topics: Programming Languages
Lecture #23 0 V22.0490.001 Special Topics: Programming Languages B. Mishra New York University. Lecture # 23 Lecture #23 1 Slide 1 Java: History Spring 1990 April 1991: Naughton, Gosling and Sheridan (
More information