Operating System(16MCA24)

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1 PESIT- Bangalore South Campus Hosur Road (1km Before Electronic city) Bangalore Department of MCA COURSE INFORMATION SHEET Operating System(16MCA24) 1. GENERAL INFORMATION Academic Year: 2017 Semester(s):I Title Code Duration OPERATING SYSTEM Lecture 52 Hrs 16MCA24 Total: 52 Hrs 2. FACULTY DETAILS Deta Name RICHA SHARMA Department MCA Room TH FLOOR richasharma@pes.edu Contact Hours Office Hours Consultation By

2 3. VENUE AND HOURS/WEEK All lectures will normally be held in 500. Lecture Hours/week: 4Hr 2. PRE REQUIREMENT STATEMENT This course provides a comprehensive introduction to understand the underlying principles, techniques and approaches which constitute a coherent body of knowledge in operating systems. In particular, the course will consider inherent functionality and processing of program execution. The emphasis of the course will be placed on understanding how the various elements that underlie operating system interact and provides services for execution of application software. 3. COURSE OBJECTIVES 4. CO U RS E OUTCOMES: The STUDENT WILL BE ABLE : 1.Gain extensive knowledge on principles and modules of operating system. 2.Understand key mechanisms in design of operating system modules. 3.Understand process management, concurrent processes and threads, memory management, virtual memory concepts, deadlocks. 4.Be familiar with multithreading 5.Master concepts of memory management including virtual memory 6.Master system resources sharing among the users 7.Master issues related to file system interface and implementation, disk management 8.Be familiar with protection and security mechanisms 9.Be familiar with various types of operating systems including Unix 10.Produce algorithmic solution to process synchronization problems. 11.Practice with operation system concepts such as process management, synchronization.

3 5. MODULE SPECIFICATION:

4 % of syllabus Class Theme Topic Outline & Readings covered Cumulative % of Portions Covered 1. Basic Elements, Processor Registers, Instruction Execution, Interrupts The Memory Hierarchy, Cache Memory, I/O Communication 3 Techniques, Introduction to Operating System, Mainframe Systems, Desktop Systems, Multiprocessor 5 Systems 4 Distributed Systems, Clustered Systems, 5 Real - Time Systems,Handheld Systems, Feature Migration, Computing 6 Environments Computer System Components, Operating 7 and System Services 13 Operating Systems 8 System Calls, System Programs Structure 15 9 System Structure, Virtual Machines, System Design and Implementation 11 System Generation Process, Process States, Process Description, Process Control Execution of the Operating System, Security Issues Processes and Threads, Symmetric Multiprocessing(SMP) CPU Scheduler and 30

5 Scheduling. 17 CPU Scheduler and Scheduling CPU Scheduler and Scheduling Principles o f Concurrency, Monitors Mutual Exclusion : Hardware 48 Support Process Semaphores 40 Management and Mutual Execution 22 Message Passing 23 Readers/Writes Problem Readers/Writes Problem Principles of Deadlock,, Deadlock Avoidance, Deadlock Detection, An Integrated Deadlock Strategy, 50 Dining Philosophers Problem 26 Deadlock Prevention Deadlock and Deadlock Detection 54 Memory 76 Management 28 An Integrated Deadlock Strategy Dining Philosophers Problem 30 Readers 31 Swapping, Contiguous Memory Allocation 32 Paging Segmentation, Segmentation with Paging 68

6 34 Demand Paging, Process Creation Page Replacement 36 Allocation of Frames Thrashing 76 File Concept, Access Methods, 38 Directory Structure, File System Mounting, File Sharing, Protection File SystemFile System Structure, & Secondary Storage 41 File System Implementation, 84 Directory Implementation 43 Allocation Methods Free Space Management Disk Structure, Disk Scheduling Disk Scheduling,Disk Management, 92 51, User Authentication, The Security 94 Problem, 48 Computer Program Threats, System Threats. 96 Security Linux System, Linux history, 49 Case study of Design Principles, Kernel modules Linux Operating 100 system: Process management, scheduling, 98 Memory management, File systems, Input and output, Inter-process Communications. 100

7 Literature /References TEXT BOOKS 1. Silberschatz, Galvin, Gagne, Operating System Concepts John Wiley, Sixth Edition, William Stallings, Operating Systems Internals and Design Principles Pearson, 6th edition, 2012 REFERENCE BOOKS 1.Chakraborty, Operating Systems Jaico Publishing House, Dhananjay M. Dhamdhere, Operating Systems A Concept Based Approach, Tata McGraw Hill, 3rd Edition, 2012 Elmasri, Carrick, Levine, Operating Systems A spiral Approach, Tata McGraw Hill, 2012

8 3. Internal Assessment S.No Activity Marks 1. Seminar 5 2. Quizzes (surprise test) 5 3. Overall Participation 5 4. Assignment 5 5. Internal Tests 30 TOTAL 50 Seminar: A group of 2 students each will present either a case study. The presentation has to be approved by me before presenting in class. Assignment: Question Bank Part - A 1. What is an operating system? 2. What is the kernel?

9 3. What are batch systems? 4. Differentiate tightly coupled systems and loosely coupled systems. 6. What is real time system? 8. What do you mean by system calls? 10. What is a process? 11. What is process control block? 12. What is scheduler? 13. What are the use of job queues, ready queues and device queues? 14. What is meant by context switch? 15. What is independent process? 16. What is co-operative process? 17. What are the benefits OS co-operating processes? 19. State the advantage of multiprocessor system. 20. What is the use of inter process communication? 22. What are the benefits of multithreaded programming? 23. Compare user threads and kernel threads. 24. What is the use of fork and exec system calls? Part - B 1. Explain the various types of computer systems. 2. (i) what is the purpose of system calls? Briefly explain the types of system calls provided by a typical operating system. (ii)explain how co-operating process communication with each other via an IPC. 3. Discuss briefly the various issues involved in implementing Inter process communication (IPC) in message passing system. 4. Explain in detail about the threading issues. 5. Explain about Multi-Threading Models.

10 6. Explain in detail about Review of Computer Organization. 7. Write short notes about Process concept and process scheduling. UNIT-II PROCESS SCHEDULING AND SYNCHRONIZATION 1. Define CPU scheduling. 2. What is preemptive and no preemptive scheduling? 3. What is a Dispatcher? 4. What is dispatch latency? 5. What are the various scheduling criteria for CPU scheduling? 6. Define throughput. 7. What is turnaround time? 8. Define race condition. 9. What is critical section problem? 10. What are the requirements that a solution to the critical section problem must satisfy? 11. Define entry section and exit section. 12. What is a semaphore? 13. Define busy waiting and spin lock. 14. Define deadlock. 15. What are conditions under which a deadlock situation may arise? 16. What is a resource-allocation graph? 17. Define request edge and assignment edge. 18. What are the methods for handling deadlocks? 19. Define deadlock prevention.

20. Define deadlock avoidance. 21. What are a safe state and an unsafe state? 22. What is banker s algorithm? Part - B 1. Write about the various CPU scheduling algorithms. 2. What is critical section problem and explain two process solutions and multiple process solutions?

11 20. Define deadlock avoidance. 21. What are a safe state and an unsafe state? 22. What is banker s algorithm? Part - B 1. Write about the various CPU scheduling algorithms. 2. What is critical section problem and explain two process solutions and multiple process solutions? 3. Explain what semaphores are, their usage, implementation given to avoid busy waiting and binary semaphores. 4. Write about critical regions and monitors. 5. Give a detailed description about deadlocks and its characterization. 6. Explain about the methods used to prevent deadlocks 7.Explain the Banker s algorithm for deadlock avoidance. 8. Consider the following snapshot of a system: Process Allocation max available Answer the following questions using the banker s algorithm: 1) What is the content of the matrix need? 2) Is the system in a safe state? 3) If a request from process p1 arrives for (0, 4, 2, 0), can the request be granted immediately? 9. Consider the following set of process, with the length of the CPU-burst time given in milliseconds:

12 process Burst time Priority P P2 1 1 P3 2 3 P4 1 4 P5 5 2 The processes are assumed to have arrived in the order p1, p2, p3, p4, p5, all at time 0. a) Draw four Gantt charts illustrating the execution of these process using FCFS, SJF, a nonpreemptive priority (a smaller priority number implies a higher priority), and RR (quantum=1) scheduling. b) What is the turnaround time of each process for each of the scheduling algorithms in part a? c) What is the waiting time of each process for each of the scheduling algorithms in part a? d) Which of the schedules in part a results in the minimal average waiting time (over all processes)? UNIT-III-STORAGE MANAGEMENT 1. Define logical address and physical address. 2. What is logical address space and physical address space? 3. What is the main function of the memory-management unit? 4. Define dynamic loading. 5. Define dynamic linking. 6. Define swapping. 7. What are the common strategies to select a free hole from a set of available holes? 8. What do you mean by best fit? 9. What do you mean by first fit? 10. What is virtual memory?

13 11. What is Demand paging? 12. Define lazy swapper. 13. What is a pure demand paging? 14. Define effective access time. 15. Define secondary memory. 16. What is the basic approach of page replacement? 17. What are the various page replacement algorithms used for page replacement? 18. What are the major problems to implement demand paging? 19. What is a reference string? 20. What are the advantages of Contiguous allocation? 21. Define Paging. 22. Define Segmentation. Part - B 1. Explain about contiguous memory allocation. 2. Give the basic concepts about paging. 3. Explain the basic concepts of segmentation. 4. Explain the various page replacement strategies. 5. Consider the following page-reference string: 1,2,3,4,2,1,5,6,2,1,2,3,7,6,3,2,1,2,3,6 How many page faults would occur for the following replacement algorithms, assuming frame size is 4.Remember that frames are initially empty. (i)lru replacement (ii)fifo replacement (iii)optimal replacement 6. Explain in detail about swapping and thrashing. 7. Write in detail about Virtual memory.

14 UNIT-IV FLE SYSTEM 1. What is a file? 2. List the various file attributes. 3. What are the various file operations? 4. What is the information associated with an open file? 5. What are the different accessing methods of a file? 6. What are the operations that can be performed on a directory? 7. What are the most common schemes for defining the logical structure of a directory? 8 What are the various layers of a file system? 9. What are the structures used in file-system implementation? 10. What are the functions of virtual file system (VFS)? 11. Define seek time and latency time. 12. What are the allocation methods of a disk space? 13. What are the advantages of Contiguous allocation? 14. What are the drawbacks of contiguous allocation of disk space? 15. What are the advantages of Linked allocation? 16. What are the disadvantages of linked allocation? 17. What are the advantages of Indexed allocation? 18. Define rotational latency and disk bandwidth. 19. How free-space is managed using bit vector implementation? Part - B 1. What are files and explain the access methods for files? 2. Write in detail about file concept.

15 3. Write notes about the protection strategies provided for files. 4. Write in detail about directory structure. 5. Write in detail about File-System Implementation. 6. Write in detail about Allocation methods. UNIT-V-I/O SYSTEMS 1. Define buffering. 2. Define caching. 3. Define spooling. 4. What are the various disk-scheduling algorithms? 5. What is low-level formatting? 6. What is the use of boot block? 7. What is sector sparing? 8. Define rotational latency and disk bandwidth. 9. What is mean by streams? 10. Define seek time. 11. What is mean by FCFS and SSTF scheduling algorithms? 12. Define SCAN and C-SCAN scheduling algorithms. 13. What is Look Scheduling? 14. Define RAID. 15. Difference between stable storage and tertiary storage. Part - B 1. Write about the kernel I/O subsystem. 2. Explain the various disk scheduling techniques

16 3. Write notes about disk management and swap-space management. 4. A hard disk having 2000 cylinders, numbered from 0 to the drive is currently serving the request at cylinder 143,and the previous request was at cylinder 125.The status of the queue is as follows 86, 1470, 913, 1774,948,1509,1022,1750,130 What is the total distance (in cylinders) that the disk arm moves to satisfy the entire pending request for each of the following disk-scheduling algorithms? (i)sstf) (ii) FCFS (iii) SCAN (IV) C-SCAN 5. Explain in various RAID Level. 6.Write notes about Stable storage and tertiary storage.

QUESTION BANK UNIT I

QUESTION BANK UNIT I QUESTION BANK Subject Name: Operating Systems UNIT I 1) Differentiate between tightly coupled systems and loosely coupled systems. 2) Define OS 3) What are the differences between Batch OS and Multiprogramming?