Enumeration

Process Control, file management, device management, information maintenance, communication, protection,

Types of System Calls

File management, status information, file modification, programming-language support, program loading and execution, communications and background services

System Services

command interpreters, GUI, Touch-screen interface

User and Operating-System Interface

user interface, Program execution, i/o operations, file-system manipulation, communications, error detection, resource allocation, logging and protection and security

Operating System Structures

message-passing model and shared-memory model

2 types of communication

hardware, application programs, operating system and users

Components of computer system

1. Process Management

2. Memory Management

3. File-System Management

4. Mass-Storage Management

5. Cache Management

6. I/O System Management

resource management in os

Batch OS, Multiprogramming OS, Multiprocessing OS, Multitasking OS, Distributed OS, Network OS, Time-sharing OS, and Real-time OS

Type of Operating System

New, Running, Waiting (blocked), ready, and terminated

Process State

Process State, Program Counter, Cpu registers, CPU-scheduling information, memory-management information, accounting information, i/o status information

Process Control Block

ready queue, and wait queue

Scheduling queues

Non- preemptive and preemptive

Categories in Scheduling falls into two categories:

long term or job scheduler, short-term or cpu scheduler and , medium-term scheduler

Process Schedulers

Address space, cpu state, OS resources

Process Structure

State save, state restore

Context switch