ch2 - Chapter 2: Operating-System Structures Chapter...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 2: Operating-System Structures Chapter 2: Operating-System Structures
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2.2 Silberschatz, Galvin and Gagne ©2005 th Chapter 2: Operating-System Chapter 2: Operating-System Structures Structures Operating System Services User Operating System Interface System Calls Types of System Calls System Programs Operating System Design and Implementation Operating System Structure Virtual Machines Operating System Generation System Boot
Background image of page 2
2.3 Silberschatz, Galvin and Gagne ©2005 th 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 To explain how operating systems are installed and customized and how they boot
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2.4 Silberschatz, Galvin and Gagne ©2005 th Operating System Services Operating System Services One set of operating-system services provides functions that are helpful to the user: User interface - Almost all operating systems have a user interface (UI) Varies between Command-Line (CLI), Graphics User Interface (GUI), Batch (Files) 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) I/O operations - A running program may require I/O, which may involve a file or an I/O device. For specific devices, special functions may be desired (such as recording to a CD or blanking a CRT screen). Users usually cannot control I/O devices directly. 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.
Background image of page 4
2.5 Silberschatz, Galvin and Gagne ©2005 th Operating System Services (Cont.) Operating System Services (Cont.) One set of operating-system services provides functions that are helpful to the user (Cont): 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) Error detection – OS needs to be constantly aware of possible errors May occur in the CPU and memory hardware (e.g. memory error), in I/O devices (e.g. parity error, connection failure), in user program (e.g. arithmetic overflow). 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
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2.6 Silberschatz, Galvin and Gagne ©2005 th 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 among the users. Resource allocation -
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/21/2010 for the course CS 145 taught by Professor Markjan during the Spring '10 term at Abilene Christian University.

Page1 / 56

ch2 - Chapter 2: Operating-System Structures Chapter...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online