This document outlines the structure and content of a course on operating system principles. It is divided into 5 units that cover topics like process management, memory management, distributed systems, and synchronization. The introduction defines key parts of a computer system like the operating system, hardware, and users. It describes the role of the operating system in allocating resources and controlling devices and programs. Examples are given of popular desktop, mobile, and server operating systems.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
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Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
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Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
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2. UNIT -I INTRODUCTION TO OPERATING SYSTEM
UNIT -II
UNIT -III
UNIT -IV
UNIT -V
PROCESS MANAGEMENT
Process Synchronization and Deadlocks
MEMORY MANAGEMENT AND FILE-SYSTEM
INTRODUCTION TO DISTRIBUTED SYSTEMS
3. UNIT–I INTRODUCTION TO OPERATING SYSTEM
Computer System organization, Computer System architecture,
Operating System structure, Operating System operations, Process
management, Memory management, Storage management, Protection
and security, Special-purpose systems, Computing environments,
Operating System Services, User interface, System calls, System
programs, Operating System design and implementation, Operating
System structure, Operating System generation, System boot- Case
Study.
5. Microsoft Windows
Apple macOS
Ubuntu
Linux
Chrome OS
Red Hat
Fedora
CentOS
FreeBSD
x
Examples of Operating System
Google's Android OS
Apple iOS
Windows Phone OS
Series 40 (Nokia)
Symbian OS (Nokia)
BlackBerry OS
Bada – Samsung
MeeGo OS (Nokia and Intel)
8. x
Examples of Operating System with Market Share
OS Name Share
Windows 40.34
Android 37.95
iOS 15.44
Mac OS 4.34
Linux 0.95
Chrome OS 0.14
Windows Phone OS 0.06
9. In the Computer System (Hardware and Software), Hardware can only
understand machine code (in the form of 0’s and 1’s).
x
Operating System
11. A Computer System consists of:
1. Users People who are using the Computer. (Machine)
2. Application Programs Compilers, Databases, Games, Video player,
Web Browsers, Word Processors etc.
3. System Programs Shells, Editors, Compilers, etc.
4. Operating System A special program which acts as an interface
between user and hardware.
5. Hardware CPU, Disks, Memory, I/O etc.
x
Structure of a Computer System
12. A Computer System consists of:
1. Users People who are using the Computer. (Machine)
2. Application Programs Compilers, Databases, Games, Video player,
Web Browsers, Word Processors etc.
3. System Programs Shells, Editors, Compilers, etc.
4. Operating System A special program which acts as an interface
between user and hardware.
5. Hardware CPU, Disks, Memory, I/O etc.
x
Structure of a Computer System
13. What is an Operating System?
A program that acts as an intermediary between a user of a
computer and the computer hardware
Operating system goals:
•Execute user programs and make solving user problems
easier
•Make the computer system convenient to use
•Use the computer hardware in an efficient manner
14. Computer System Structure
Computer system can be divided into four components:
•provides basic computing resources
CPU Hardware – Memory, I/O devices
•Operating system-
Controls and coordinates use of hardware among various applications
and users
•Application programs – define the ways in which the system resources are
used to solve the computing problems of the users
Word processors, compilers, web browsers, database systems, video
games
•Users
People, machines, other computers
16. User View
1. System is designed for one user to monopolize its resources.
• The goal is to maximize the work (or play) that the user is
performing.
• In this case/ the operating system is designed mostly for ease of
use, with some attention paid to performance and none paid to
resource utilization –how various hardware and software
resources are shared.
17. User view
2. A user sits at a terminal connected to a mainframe or a
minicomputer. Other users are accessing the same computer
through other terminals.
• These users share resources and may exchange information.
• The operating system in such cases is designed to maximize
resource utilization- to assure that all available CPU time,
memory, and I/0 are used efficiently and that no individual user
takes more than her fair share.
18. User view
• 3. In some cases, users sits at workstations connected to networks of
other workstations and servers. These users have dedicated
resources at their disposal, but they also share resources such as
networking and servers- file , compute, and print servers.
• Therefore, their operating system is designed to compromise
between individual usability and resource utilization.
19. System View
• The operating system is the program most intimately involved with
the hardware. In this context, we can view an operating system as
a resource allocation.
• A computer system has many resources that may be required to
solve a problem: CPU time, memory space, file-storage space, I/0
devices, and so on.
• A slightly different view of an operating system emphasizes the
need to control the various I/0 devices and user programs. An
operating system is a control program
20. System View
• A control program manages the execution of user programs to
prevent errors and improper use of the computer. It is especially
concerned with the operation and control of I/O devices
21. What Operating Systems Do
Depends on the point of view:
Users want convenience, ease of use and good performance
•Don’t care about resource utilization
But shared computer such as mainframe or minicomputer
must keep all users happy
•Operating system is a resource allocator and control
program making efficient use of HW and managing execution
of user programs
22. What Operating Systems Do (Cont.)
Users of dedicate systems such as workstations have dedicated
resources but frequently use shared resources from servers
Mobile devices like smartphones and tables are resource poor,
optimized for usability and battery life
•Mobile user interfaces such as touch screens, voice recognition
Some computers have little or no user interface, such as
embedded computers in devices and automobiles: ex- IoT devices
•Run primarily without user intervention
23. Operating System Definition
No universally accepted definition
“The one program running at all times on the computer” is the
kernel, which is part of the operating system
Everything else is either
•A system program (ships with the operating system, but not part of the
kernel) , or
•An application program, all programs not associated with the operating
system
Today’s OSes for general purpose and mobile computing also include
middleware – a set of software frameworks that provide addition services to
application developers such as databases, multimedia, graphics
26. Computer System Organization
Computer-system operation
•One or more CPUs, device controllers connect through common bus providing access to shared
memory
•Concurrent execution of CPUs and devices competing for memory cycles
27. Computer Startup
Bootstrap program is loaded at power-up or
reboot
Typically stored in ROM or EPROM, generally
known as firmware
Initializes all aspects of system
Loads operating system kernel and starts
execution
29. Storage Definition and Notation
• A bit is a basic unit of computer storage. It can contain one of two
values: zero and one.
• Storage in a computer is based on collections of bits
• Given enough bits, it is amazing how many things a computer can
represent: numbers, letters, images, movies, sounds, documents,
and programs, to name a few.
• A Byte is 8 bits, and on most computers it is smallest convenient
chunk of storage.
• kilobyte: 1024bytes; megabyte: 1024^2 bytes; gigabyte: 1024^3
bytes
30. Storage Structure
Main memory – only large storage media that the CPU
can access directly
•Typically, volatile
•Typically, random-access memory in the form of
Dynamic Random-access Memory (DRAM)
Secondary storage – extension of main memory that
provides large nonvolatile storage capacity
31. Storage Structure (Cont.)
Hard Disk Drives (HDD) – rigid metal or glass platters
covered with magnetic recording material
•Disk surface is logically divided into tracks, which are
subdivided into sectors
•The disk controller determines the logical interaction
between the device and the computer
Non-volatile memory (NVM) devices– faster than hard
disks, nonvolatile
•Various technologies
•Becoming more popular as capacity and performance
increases, price drops
32. Storage Hierarchy
Storage systems organized in hierarchy
•Speed
•Cost
•Volatility
Caching – copying information into faster storage
system; main memory can be viewed as a cache for
secondary storage
Device Driver for each device controller to manage I/O
•Provides uniform interface between controller and
kernel
35. How a Modern Computer Works
A von Neumann architecture
36. Operating-System Operations
Bootstrap program – simple code to initialize the system,
load the kernel
Kernel loads
Starts system daemons (services provided outside of the
kernel)
Kernel interrupt driven (hardware and software)
•Hardware interrupt by one of the devices
•Software interrupt (exception or trap):
Software error (e.g., division by zero)
Request for operating system service – system call
Other process problems include infinite loop,
processes modifying each other or the operating
system
37. System Calls
• System calls provide an interface to the services made available
by an operating system.
• These calls are generally available as routines written in C and
C++, although certain low-level tasks (for example, tasks where
hardware must be accessed directly) may have to be written using
assembly-language instructions.
• The first input that the program will need is the names of the two
files: the input file and the output file
• System calls is a programmatic way in which a computer program
request a service from kernel of the operating system.
38.
39. The handling of a user application invoking
the open() system call
40. Types of System Calls
Process control
•create process, terminate process
•end, abort
•load, execute
•get process attributes, set process attributes
•wait for time
•wait event, signal event
•allocate and free memory
•dump memory if error
•Debugger for determining bugs, single step execution
•Locks for managing access to shared data between processes
41. File management
• create file, delete file
• open, close file
• read, write, reposition
• get and set file attributes
Device management
• request device, release device
• read, write, reposition
• get device attributes, set device attributes
• logically attach or detach devices
Types of System Calls (Cont.)
42. Types of System Calls (Cont.)
Information maintenance
• get time or date, set time or date
• get system data, set system data
• get process, file, or device attributes
• set process, file, or device attributes
Communications
• create, delete communication connection
• send, receive messages
• transfer status information
• attach or detach remote devices
43. Types of System Calls (Cont.)
• Protection provides a mechanism for controlling access to the
resources provided by a computer system. Historically, protection
was a concern only on multi programmed computer systems with
several users.
• System calls providing protection include set permission() and get
permission(), which manipulate the permission settings of resources
such as files and disks. The allow user() and deny user() system calls
specify whether particular users can—or cannot—be allowed access
to certain resources.
44.
45. Single Processor System
• In Single Processor System, there is one main CPU capable of
executing a general purpose instruction set, including instructions
from user programs.
46. Multi processor Systems
• Multiprocessor systems (also known as parallel systems or
multicore systems) have begun to dominate the landscape of
computing.
• Such systems have two or more processors in close
communication, sharing the computer bus and sometimes the
clock, memory, and peripheral devices. Multiprocessor systems
first appeared prominently appeared in servers and have since
migrated to desktop and laptop systems
47. Multiprocessor systems have three main
advantages:
• Increased throughput. By increasing the number of processors,
we expect to get more work done in less time. The speed-up ratio
with N processors is not N, however; rather, it is less than N.
• Economy of scale. Multiprocessor systems can cost less than
equivalent multiple single-processor systems, because they can
share peripherals, mass storage, and power supplies
• Increased reliability. If functions can be distributed properly
among several processors, then the failure of one processor will
not halt the system, only slow it down