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IntroductionJan13

IntroductionJan13 - OperatingSystems:Overview...

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10/16/10 B.Ramamurthy 1 Operating Systems : Overview Bina Ramamurthy CSE421/521
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10/16/10 B.Ramamurthy 2 Topics for discussion What will you learn in this course?  (goals) What is an Operating System (OS)? Important OS Components System call API (application  programming interface) Operating system modular view
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10/16/10 B.Ramamurthy 3 Goals for the course Study the working of an OS. Study the design and implementation of various  components of an OS. Learn about the alternatives available to a designer at  all levels of abstraction in an OS. Learn concurrent programming using processes,  threads, and system calls. Understand the various data structures and algorithms  enabling the functionality of an OS. Explore how you may contribute to solving many open  problems in OS.
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10/16/10 B.Ramamurthy 4 What is an Operating system? Interface manager Human interaction made easy interfacing, abstraction, control and sharing Resource manager  Efficient use of resources Enhances hardware features “virtual” time, space and resource (processes, threads)  System and data security and protection provider
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10/16/10 B.Ramamurthy 5 User Interface Operating system provides these facilities for the user: Program creation : editors, debuggers, other  development tools. Program execution : load, files, IO operations. Access to IO devices: Read and writes. Controlled access to files: protection mechanisms,  abstraction of underlying device. System access: Controls who can access the system. Error detection and response: external, internal, software  or hardware error. Accounting: Collect stats., load sharing , for billing  purposes.
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10/16/10 B.Ramamurthy 6 Resource Manager Processors : Allocation of processes to  processors, preemption, scheduling.
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