Operating Systems
Short definition: A software to manage hardware resources.
Provider of a virtual execution environment on top of hardware that is more convenient than the raw hardware interface.
Abstractions
| Resource | Abstraction |
|---|---|
| CPU | Process |
| Disk | File |
| Screen | Window |
| Network | Socket |
Goals
User goals & System goals
Mechanisms and Policies
Policy: what one wants to implememt
Mechanism: how it is implemented
System Implementation
Traditionally written in assembly.
Most current OSs are written in high level languages (C language).
OS Design Principles
Dependability & Performance