Sciences Information Technology Department IT 325: Operating Systems Assignment 7 first Semester 1433/1434H – 2012/2013 Q1) The following is a set of three interacting processes that can access two shared semaphores: semaphore U = 2; semaphore V = 0; [Process 1] [Process 2] [Process 3] L1:wait(U) L2:wait(V) L3:wait(V) type("B") type("D") type("A")
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Process Handling in Linux POS 420 October 11‚ 2005 In Linux processes communicate with each other and with the kernel to coordinate their activities. Linux supports a number of Inter-Process Communication (IPC) mechanisms. Signals and pipes are two of them but Linux also supports the System V IPC mechanisms named after the Unix TM release in which they first appeared. Signals are one of the oldest inter-process communication methods used by Unix TM systems. The common Linux shells all allow
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CSCI 4061: Introduction to Operating Systems Fall 2008 Mid-Term Exam II Sample Solution NAME: STUDENT ID: General Instructions: • Write your name and student ID clearly above. • You have 1 hour and 15 minutes to write the exam. No extra time will be given. • There are 4 questions in the exam‚ all with subparts. The questions combine for a maximum of 100 points. • You must write your answers clearly in the space provided for each question. You might use the backside of each page‚ as well as
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Baghdad University Collage of Science Computer Science Department InterProcess Communication Mechanisms In Linux 2009-2010 1.Introduction A modern Multiprogramming Operating Systems like Linux supports the creation and concurrent execution of multiple processes or threads. Some will act independently of others‚ but most will need to cooperate with each other. There are several reasons for providing an environment that allows process cooperation[1]: • Information sharing.
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producer deposits a new item into the buffer. The solution provided uses semaphores‚ enabling inter-process communication. A solution not implementing a semaphore will result in a race condition. (In this instance‚ we have only one producer and one consumer. Since it was my decision to code it this way‚ a mutex object would remedy the problem of a race condition with multiple producers and consumers. I chose to use semaphores instead‚ and my results are still correct). Race conditions arise from
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USING THE FREERTOS REAL TIME KERNEL A Practical Guide Richard Barry This page intentionally left blank © 2009 Richard Barry All text‚ source code and diagrams are the exclusive property of Richard Barry. Distribution or publication in any form is strictly prohibited without prior written authority from Richard Barry. FreeRTOS™‚ FreeRTOS.org™ and the FreeRTOS logo are trade marks of Richard Barry. Version 1.0.5 http://www.FreeRTOS.org CONTENTS CONTENTS I LIST OF FIGURES ...
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empty; //setup binary semaphores buffer_item buffer[BUFFER_SIZE]; //setup buffers int counter; //setup buffer counter pthread_t tid; //setup thread ID pthread_attr_t attr; //setup thread attributes void *producer(void *param); //producer thread void *consumer(void *param); //consumer thread void initializeData() { //Setup locks‚ semaphores‚ and counters pthread_mutex_init(&mutex‚ NULL); //setup mutex lock sem_init(&full‚ 0‚ 0); //setup full semaphore and init to 0 sem_init(&empty
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Name______ _________________________________ Student ID____ ________________________________ Homework 1 Due: Wednesday‚ February 23‚ 2011 All answers must be clear and to the point and on the page they were asked. Do not repeat the question. Do not email the homework in. Bring it to class on or before the day it is do‚ otherwise put it in my mailbox. 1) Numbers can be represented in binary (using 2 symbols 0 and 1) and hexadecimal ( 16 symbols 0..9‚1‚A..F) amount other ways
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UNIVERSITY OF WATERLOO CS 350 MIDTERM :: SPRING 2012 Date: Monday‚ June 25‚ 2012 Time: 7:00 – 8:50 pm Instructor: Dave Tompkins Exam Type: Closed book Additional Materials Allowed: none Last Name: SOLUTION First Name: ____________________________ Student #: __ __ __ __ __ __ __ __ UW Login: __ __ __ __ __ __ __ __ Signature: ____________________________ Question Out Of INSTRUCTIONS 1. Before you begin‚ make certain that you have one exam booklet with 8 pages (double sided) 2. All solutions
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Whiteley and Philp Wolfhagen Paintings: Whiteley’s ‘River at Marulan (Reading Einstein’s Geography)’ & Wolfhagen’s ‘ Landscape Semaphore No 8’ Brett Whiteley and Philp Wolfhagen are two very interesting artists‚ with two very different styles. The two paintings being analysed are Whiteley’s ‘River at Marulan (Reading Einstein’s Geography)’ & Wolfhagen’s ‘ Landscape Semaphore No 8’. Both artists have different intentions about what they are trying to say to the viewer. In Wolfhagen’s painting‚ he
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