Operating systems
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The document discusses two solutions to classic concurrency problems: 1) An unbounded buffer problem is solved using locks and conditions to control a producer and consumer accessing a shared buffer. The solution uses locks to prevent overflow or underflow of the buffer. 2) The dining philosophers problem is solved by having philosophers randomly wait before acquiring both forks, to avoid deadlock. Philosophers release forks and rejoin the queue if they cannot acquire both within a timeout.
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- Exceptions propagate up the call stack and are caught by outer blocks or cause program termination if uncaught
- Stack unwinding cleans up function calls as exceptions bubble up
Let's Talk Locks!
Video and slides synchronized, mp3 and slide download available at URL http://bit.ly/2msgBlb.
Kavya Joshi explores when and why locks affect performance, delves into Go’s lock implementation as a case study, and discusses strategies one can use when locks are actually a problem. Filmed at qconnewyork.com.
Kavya Joshi works as a software engineer at Samsara - a start-up in San Francisco. She particularly enjoys architecting and building highly concurrent, highly scalable systems.
Java 5 concurrency
The document discusses Java 5 concurrency features including locks, conditions, atomic variables, blocking queues, concurrent hash maps, synchronizers like semaphores and mutexes, and the executor framework. Key points include:
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04 threads
This document provides an overview of threads in Java. It discusses creating threads by extending Thread or implementing Runnable, synchronization using the synchronized keyword and locks, and wait() and notify() to allow threads to wait for events. It provides examples of each concept and recommends using a thread pool rather than creating a new thread per task to prevent scaling issues. The document concludes with an exercise to implement multithreaded printing of numbers using a thread pool.
Exception handling and templates
The document discusses exception handling in C++. It defines exceptions as conditions that occur during execution and prevent normal program continuation. Exception handling involves trying blocks of code that may throw exceptions, throwing exceptions when errors occur, and catching exceptions in handler blocks to deal with the errors. The key aspects of exception handling are try blocks for code that can throw, throw statements to indicate exceptions, and catch blocks that match exception types to handle them.
----------Evaluator-java---------------- package evaluator- import j.docx
**********Evaluator.java****************
package evaluator;
import java.util.*;
import operand.Operand;
import operator.Operator;
public class Evaluator {
private Stack<Operand> operandStack;
private Stack<Operator> operatorStack;
private StringTokenizer tokenizer;
private static final String DELIMITERS = "+-*^/() ";
public Evaluator() {
operandStack = new Stack<Operand>();
operatorStack = new Stack<Operator>();
}
public int eval(String expression) {
int result = 0;
String token;
Operator hashOpr = Operator.operators.get("#");
oprStack.push(hashOpr);
String delimiters = "+-*/#!";
// The 3rd argument is true to indicate that the delimiters should be used
// as tokens, too. But, we'll need to remember to filter out spaces.
this.tokenizer = new StringTokenizer(expression, DELIMITERS, true);
while (this.tokenizer.hasMoreTokens()) {
// filter out spaces
if (!(token = this.tokenizer.nextToken()).equals(" ")) {
// check if token is an operand
if (Operand.check(token)) {
operandStack.push(new Operand(token));
} else {
if (!Operator.check(token)) {
System.out.println("*****invalid token******");
System.exit(1);
}
// TODO Operator is abstract - this line will need to be fixed:
// ( The Operator class should contain an instance of a HashMap,
// and values will be instances of the Operators. See Operator class
// skeleton for an example. )
Operator newOperator = null; // new Operator( token );
while (operatorStack.peek().priority() >= newOperator.priority()) {
// note that when we eval the expression 1 - 2 we will
// push the 1 then the 2 and then do the subtraction operation
// This means that the first number to be popped is the
// second operand, not the first operand - see the following code
Operator oldOpr = operatorStack.pop();
Operand op2 = operandStack.pop();
Operand op1 = operandStack.pop();
operandStack.push(oldOpr.execute(op1, op2));
}
operatorStack.push(newOperator);
}
}
}
// Control gets here when we've picked up all of the tokens; you must add
// code to complete the evaluation - consider how the code given here
// will evaluate the expression 1+2*3
// When we have no more tokens to scan, the operand stack will contain 1 2
// and the operator stack will have + * with 2 and * on the top;
// In order to complete the evaluation we must empty the stacks (except
// the init operator on the operator stack); that is, we should keep
// evaluating the operator stack until empty
// Suggestion: create a method that takes an operator as argument and
// then executes the while loop; also, move the stacks out of the main
// method
return 0;
}
/**
* Class to help test your Evaluator:
* javac EvaluatorTester
* java EvaluatorTester "1+2" "3*5"
*/
public static void main(String[] args) {
Evaluator evaluator = new Evaluator();
for (String arg : args) {
System.out.format("%s = %d\n", arg, evaluator.eval(arg));
}
}
}
************************************Operand.Java**************************************************
package operand;
public class Operand {
public .
Java Multithreading.pptx
The document discusses threads and threading in Java. It covers:
- Threads allow multitasking by running multiple threads concurrently within a program.
- Threads can be created by extending the Thread class or implementing the Runnable interface.
- Threads have different states like new, ready, running, blocked, and dead. Methods like start(), sleep(), join(), yield(), etc. change a thread's state.
- Synchronization is needed to prevent data corruption when multiple threads access shared resources concurrently.
Wait for your fortune without Blocking!
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Lec7!JavaThreads.ppt
This document provides information about Java threads through a series of slides. It defines a thread as a single sequential flow of control within a program. It discusses how to define and launch threads by extending the Thread class or implementing the Runnable interface. It outlines the life cycle of a thread and its possible states such as new, runnable, blocked, waiting and terminated. It also covers how to interrupt threads and related methods.
Lec7!JavaThreads.ppt
This document discusses Java threads and synchronization. It begins with an introduction to threads, defining a thread as a single sequential flow of control within a program. It then covers how to define and launch threads in Java by extending the Thread class or implementing the Runnable interface. The life cycle of a Java thread is explained, including the various thread states. Methods for interrupting threads and thread synchronization using synchronized methods and statements are discussed. Finally, Java's monitor model for thread synchronization is described.
Theoretical presentation1nachos
This document presents algorithms for solving the producer-consumer problem using locks in NachOS. It includes code for a producer and consumer that each acquire locks before accessing a shared resource, and algorithms for testing the lock functionality, including for fairness, liveness, and safety. Safety is demonstrated by intentionally creating a deadlock between two locks to show they cannot be acquired simultaneously by different threads.
Templates
Templates allow functions and classes to work with different data types. Template classes define generic class definitions that can be used for multiple types, while template functions define generic functions. When a template is instantiated, actual code is generated for the specific types used. Exceptions provide a mechanism to handle runtime errors in C++ and are used by enclosing code that may throw exceptions in a try block and catching specific exceptions in catch blocks.
Exception handling in java
what is exception?
what is exception handling?
When occur Exception in a program?
Why we use exception handling macanisum?
explain try, catch, finally keywords.
try,catch and finally-Rules.
Types of Exception.
example of Some java Pre-defined /Built-in exception class.
User-defined Eceptions
Exception in java?
Time and Space Complexity Analysis.pptx
The document discusses time and space complexity analysis for algorithms, including using Big O notation to describe an algorithm's efficiency. It provides examples of time complexity for different codes, such as O(n) for a simple loop and O(n^2) for a double loop. The document also covers space complexity and how to estimate the complexity of a problem based on input size constraints.
Lazy Java
Lazy Java by Mario Fusco
Like all imperative languages Java is, with some minor but notable exceptions, an eagerly evaluated programming language. Nevertheless the introduction of lambdas in Java 8 also allowed the adoption of some lazy patterns and data structures that are more typically employed in functional languages. Streams represent the most evident example of how also native Java API has taken advantage of laziness, but there is a number of other interesting scenarios where laziness can be an effective solution to quite common problems. In fact laziness is the only possible technique to process potentially infinite amount of data, or more in general to delay the expensive evaluation of an expression only when and if it is necessary. But laziness is even more than that: for instance the reader monad delays not only a computation but also the need of external dependencies thus lowering the abuse of dependency injection, while a trampoline uses laziness to delay and then linearize recursive calls preventing the overflow of the stack. The purpose of this talk is illustrating why and how implementing laziness in Java with practical examples delivered with both slides and live coding sessions.
Lazy java
Why laziness is important and how to implement and use it in a strictly evaluated language like Java
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----------Evaluator-java---------------- package evaluator- import j.docx
----------Evaluator-java---------------- package evaluator- import j.docx
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The document summarizes a student project implementing a bounded buffer producer-consumer problem in Nachos using threads and semaphores. It describes using a binary semaphore for mutual exclusion and counting semaphores to synchronize shared resources. It provides the code location, compilation instructions, and execution instructions. Producer and consumer functions are shown using semaphores to control access to the shared buffer and mutex.
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Operating systems
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Operating systems
- 1. Operating Systems Team: Jonathan Arturo Alvarado Mata 1441616 Obed David Guevara Ibarra 1447478 Carlos Eduardo Triana Sarmiento 1412573 Blog: http://os-ocj.blogspot.com/
- 6. CONSUMER(){ while(1){ try to aquire the lock if(l1->TRYAQUIRE()){ if the array is empty, wait if it isn’t, continue... WHILE(ARRAY == FULL){ C->WAIT(L1); consume the next unit of data }decreae the number of items in the array CONSUME(int dummy); C-> SIGNALl(); Enables the waiting thread L1->RELEASE(); }end of if }end of while }//end of function consumer
- 7. void main(){ L1 = new lock(“L1”); C = new condition(“C”); Thread *t = new Thread(“producer”); t->Fork(producer, 1); Thread * t= new Thread(“consumer”); t->Fork(consumer, 1); }end main