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3.1 - The Function of Operating Systems
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1 Computing - F453 Mapa Mental sobre 3.1 - The Function of Operating Systems, creado por Jamie_472 el 11/04/2013.
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3.1 - The Function of Operating Systems
The main features of operating systems
An OS must:
Provide and manage hardware resources
Provide an interface between the user and the machine
Provide an interface between applications software and the machine
Provide security for the data on the system
Provide utility software to allow maintenance to be done
Original purpose was to prevent duplication of code by providing input and output resources
Prevents each individual program from having code to control input and output (duplication of code)
Input-Output Control System (IOCS)
Development of assembly/high level languages means that OS needed:
A translator program to turn human friendly code into computer friendly code
Assembler - Handles translation from assembly language
Compiler - Translates high level code into object code
Interpreter - Translates a line of high level code and runs the result before translating the next line
Memory management
More than one program should be stored in memory and the processor should give time to each of the programs
Processor should give time to each of the programs and process higher priority processes first of all
OS needs to keep all programs separate along with any data they use
Spooling
Memory used to store data that has been inputted by user or that is about to be outputted until the processor deals with it
Loader
Remembers memory locations of each instruction or each piece of data
How Interrupts are Used to Obtain Processor Time and how Processing of Interrupted Jobs may Later be Resumes
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