Operating Systems Lecture 1a Dr Ronald Grau School of Engineering and Informatics Spring term 2018 Operating System – What’s that again? 1 A piece of software (virtual machine) Provides abstractions from the hardware Provides the basic services for running other programs Gives us a user interface (the shell or GUI) […]
Operating Systems Lecture 6b Dr Ronald Grau School of Engineering and Informatics Spring term 2018 Previously 1 Deadlocks Deadlock conditions Methods of handling deadlocks Today 2 More about deadlocks More deadlock avoidance Resource Allocation Graphs Deadlock detection and recovery Recap: Prevention of deadlocks 3 Prevention by design Make sure
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Operating Systems Lecture 10b Dr Ronald Grau School of Engineering and Informatics Spring term 2018 Previously 1 The I/O System Interaction protocols Blocking vs. non-blocking I/O Recap questions 2 1. Which general factors make the I/O system of an operating system complex? 2. How do OS designers cope with this complexity? 3. What can we
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Operating Systems Lecture 6a Dr Ronald Grau School of Engineering and Informatics Spring term 2018 Previously 1 Process Synchronisation Critical Section problem Synchronisation primitives: Mutex, Semaphore, Monitor, Condition Variable, . . . Transactional Memory Message Passing Recap: Synchronisation primitives 2 Which synchronisation primitive would you use? 1. Public transport rules
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Operating Systems Lecture 10a Dr Ronald Grau School of Engineering and Informatics Spring term 2018 Previously 1 Logical file system Provides file interface (e.g., system calls) File organisation module Manages block allocation to files E.g. i-nodes in UNIX Basic file system Block-based storage format E.g. FAT-32, NTFS, ext4
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Operating Systems Lecture 11a Dr Ronald Grau School of Engineering and Informatics Spring term 2018 Previously 1 File systems and I/O Today 2 Security Terminology Cryptography Authentication Access Control Vulnerabilities Design What is security? 3 Keywords that describe aspects of security Freedom / Protection (from harm, damage, threat, anxiety,
CS 214: Systems Programming, Spring 2019 Extra Credit 0: Easter Egg Hunt 0. Abstract This assignment is individual. Please feel free to dicuss it, but do not trade or offer code or exact information. For this assignment, you will duplicate the functionality of ¡°ps aux¡±. The command stands for process status and is a tool
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Operating Systems Lecture 7a Dr Ronald Grau School of Engineering and Informatics Spring term 2018 Previously 1 Deadlocks Methods for handling deadlocks Deadlock prevention Deadlock avoidance Deadlock detection and recovery Today 2 Memory management Addressing and address spaces Partitioning and segmentation Recap: Process abstraction 3 Process: program in execution
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Operating Systems Lecture 11b Dr Ronald Grau School of Engineering and Informatics Spring term 2018 Previously 1 Security Terminology Cryptography Authentication Access Control Vulnerabilities Design Quick recap of some security topics 2 Questions: 1. What are possible violations of confidentiality? 2. Ransomware poses a threat to which security property?
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Operating Systems Lecture 7b Dr Ronald Grau School of Engineering and Informatics Spring term 2018 Previously 1 Memory management Addressing and address spaces Partitioning and segmentation Today 2 Memory management Virtual memory Paging Recap: Questions 3 1. What is a logical address? 2. What are the two main purposes of the
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