TAILIEUCHUNG - Operating System Basics

Operating System Basics .What is an Operating System • Resource Manager - Resource include: CPU, memory, disk, network - OS allocates and de-allocates these resources • Virtual Machine - provides an abstraction of a larger (or | lesson 11 Operating System Basics Resource Manager - Resource include: CPU, memory, disk, network - OS allocates and de-allocates these resources Virtual Machine - provides an abstraction of a larger (or just different machine) - Example: - Virtual memory: looks like more memory - Java: pseudo machine that looks like a stack machine - IBM VM: a complete virtual machine Multiplexor - allows sharing of resources and protection What is an Operating System Provider of Services - includes most of the things in the above definitions - provide “common” subroutes for the programmer - windowing systems - memory management The software that is always loaded/running - generally refers to the OS kernel - small protected piece of software All of these definitions are correct - but not all operating have all of these features What is OS (cont.) Robustness - accept all valid input - detect and gracefully handle all invalid input - should not be possible to crash the OS Consistency - same operation

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