02_operation_system_structures

02_operation_system_structures - Chapter 2: Operating...

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Chapter 2: Chapter 2: Operating System Operating System Structures Structures
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2.2 Modified by Bo Li ©2009 Operating System Concepts Chapter 2: Chapter 2: Operating System Structures Operating System Structures ± Operating System Services ± System Calls ± Operating System Design and Implementation ± Operating System Structure ± Virtual Machines
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2.3 Modified by Bo Li ©2009 Operating System Concepts Objectives Objectives ± To describe the services an operating system provides to users, processes, and other systems ± To discuss the various ways of structuring an operating system
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2.4 Modified by Bo Li ©2009 Operating System Concepts Operating System Services Operating System Services ± One set of operating-system services provides functions that are helpful to the user: z User interface - Almost all operating systems have a user interface (UI) ± Varies between Command-Line (CLI) , Graphics User Interface (GUI), Batch z Program execution - The system must be able to load a program into memory and to run that program, end execution, either normally or abnormally (indicating error) z I/O operations - A running program may require I/O, which may involve a file or an I/O device z File-system manipulation - The file system is of particular interest. Obviously, programs need to read and write files and directories, create and delete them, search them, list file Information, permission management.
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2.5 Modified by Bo Li ©2009 Operating System Concepts A View of Operating System Services A View of Operating System Services
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2.6 Modified by Bo Li ©2009 Operating System Concepts Operating System Services (Cont) Operating System Services (Cont) ± One set of operating-system services provides functions that are helpful to the user (Cont): z Communications – Processes may exchange information, on the same computer or between computers over a network ± Communications may be via shared memory or through message passing (packets moved by the OS) z Error detection – OS needs to be constantly aware of possible errors ± May occur in the CPU and memory hardware, in I/O devices, in user program ± For each type of error, OS should take the appropriate action to ensure correct and consistent computing ± Debugging facilities can greatly enhance the user’s and programmer’s abilities to efficiently use the system
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2.7 Modified by Bo Li ©2009 Operating System Concepts Operating System Services (Cont) Operating System Services (Cont) ± Another set of OS functions exists for ensuring the efficient operation of the system itself via resource sharing z Resource allocation - When multiple users or multiple jobs running concurrently, resources must be allocated to each of them ± Many types of resources - Some (such as CPU cycles, main memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code
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This note was uploaded on 09/24/2010 for the course COMP 252 taught by Professor Wong during the Fall '09 term at HKUST.

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02_operation_system_structures - Chapter 2: Operating...

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