tailieunhanh - Lecture Operating systems: Internals and design principles (6/E): Chapter 5 - William Stallings

Chapter 5 - Concurrency: Mutual exclusion and synchronization. After studying this chapter, you should be able to: Discuss basic concepts related to concurrency, such as race conditions, OS concerns, and mutual exclusion requirements; understand hardware approaches to supporting mutual exclusion; define and explain semaphores; define and explain monitors;. | Chapter 5 Concurrency: Mutual Exclusion and Synchronization Operating Systems: Internals and Design Principles, 6/E William Stallings Dave Bremer Otago Polytechnic, . ©2008, Prentice Hall These slides are intended to help a teacher develop a presentation. This PowerPoint covers the entire chapter and includes too many slides for a single delivery. Professors are encouraged to adapt this presentation in ways which are best suited for their students and environment. 1 Roadmap Principals of Concurrency Mutual Exclusion: Hardware Support Semaphores Monitors Message Passing Readers/Writers Problem 2 Multiple Processes Central to the design of modern Operating Systems is managing multiple processes Multiprogramming Multiprocessing Distributed Processing Big Issue is Concurrency Managing the interaction of all of these processes The central themes of operating system design are all concerned with the management of processes and threads: • Multiprogramming: The management of multiple . | Chapter 5 Concurrency: Mutual Exclusion and Synchronization Operating Systems: Internals and Design Principles, 6/E William Stallings Dave Bremer Otago Polytechnic, . ©2008, Prentice Hall These slides are intended to help a teacher develop a presentation. This PowerPoint covers the entire chapter and includes too many slides for a single delivery. Professors are encouraged to adapt this presentation in ways which are best suited for their students and environment. 1 Roadmap Principals of Concurrency Mutual Exclusion: Hardware Support Semaphores Monitors Message Passing Readers/Writers Problem 2 Multiple Processes Central to the design of modern Operating Systems is managing multiple processes Multiprogramming Multiprocessing Distributed Processing Big Issue is Concurrency Managing the interaction of all of these processes The central themes of operating system design are all concerned with the management of processes and threads: • Multiprogramming: The management of multiple processes within a uniprocessor system. • Multiprocessing: The management of multiple processes within a multiprocessor. • Distributed processing: The management of multiple processes executing on multiple, distributed computer systems. E. G clusters Concurrency encompasses a host of design issues, including communication among processes, sharing of and competing for resources (such as memory, files, and I/O access), synchronization of the activities of multiple processes, and allocation of processor time to processes. 3 Concurrency Concurrency arises in: Multiple applications Sharing time Structured applications Extension of modular design Operating system structure OS themselves implemented as a set of processes or threads • Multiple applications: Multiprogramming was invented to allow processing time to be dynamically shared among a number of active applications. • Structured applications: As an extension of the principles of modular design and structured programming, some applications

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