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CSI 400/500 Operating Systems Spring 2009 Lecture #2 – Functional Parts of an Operating System Monday January 23, 2009
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The Manager
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Device Manager Communicates with devices Maintains drivers Allocates ports Passes data and signals between device and task Discussed in detail in Lecture 14
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Process Spooler Schedules tasks Allocates resources Maintains process isolation while providing contact with system Our next topic
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Memory Manager Allocation of resources across system Separates memory Translates virtual addresses Discussed in Lectures 8 and 9
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File Manager Maintains links to external storage devices Maintains internal files and maps Handles data transfer between tasks and files Discussed in Lectures 10 and 11
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Interrupt Handler Analyzes errors Pauses action to prevent further problems Fixes error or terminates action Communicates with Process Manager Discussed in Lecture 14
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System Calls Stored library of functions Passes messages between functionary parts Available system-wide Some available to user-defined tasks
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OS Concerns
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Security Concerns Within system Between tasks and processes From outside Discussed at end of course
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OS Components
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Central Processing Unit Called “ Processor ” Performs calculations and operations Two parts: Arithmetic-logical unit Control unit and program counter
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Registers Local to processor Holds single value or address Types: Memory address register Memory data register Command register Instruction register Operation data registers
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Instruction Stack Held in local memory Holds instructions and related operands Sequential One instruction at a time loaded into CPU for processing
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Buses Used to transfer info: Between tasks Between units Between systems High-speed Dumb
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Input/Output Controllers Device drivers Connected by ports, channels, or bus lines Controls flow DOES NOT handle data transfer Handled by task Managed by device
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Interrupt Library Catalog of interrupts Available to all units Common and categorized Recognized by Interrupt handler
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