Chapter 1: Intro to OS
... switches jobs so frequently that users can interact with each job while it is running, creating interactive computing ...
... switches jobs so frequently that users can interact with each job while it is running, creating interactive computing ...
Chapter 1 - Introduction to Operating Systems
... Manages all hardware and software Acts as an interface between user and system Organised set of programs Schedule tasks and it manage storage Control and manage computer resources Making computer system convenient to use in effective manner. ...
... Manages all hardware and software Acts as an interface between user and system Organised set of programs Schedule tasks and it manage storage Control and manage computer resources Making computer system convenient to use in effective manner. ...
Computer Systems Security
... other security mechanisms in place Originally, backdoors were used by developers as a legitimate way of accessing an application, but soon after they were implemented by attackers who would use backdoors to make changes to operating systems, websites, and network devices Quite often, it is installed ...
... other security mechanisms in place Originally, backdoors were used by developers as a legitimate way of accessing an application, but soon after they were implemented by attackers who would use backdoors to make changes to operating systems, websites, and network devices Quite often, it is installed ...
CS465 Slides - Regis University: Academic Web Server for Faculty
... Multi-user, Multi-tasking • More than one user can run at the same time and each user can run more than one task at the same time • In Unix, each program is started as a process. – A process is a program in execution. • Usually only one copy of a program, but there may be many processes running the ...
... Multi-user, Multi-tasking • More than one user can run at the same time and each user can run more than one task at the same time • In Unix, each program is started as a process. – A process is a program in execution. • Usually only one copy of a program, but there may be many processes running the ...
Operating System Concepts
... – a Pascal Compiler may be executed by several people simultaneously on a network – There will only be one copy in memory – Different parts of it will be used by several different people to compile their programs – They will share the same code – Each instance of the program running will be a proces ...
... – a Pascal Compiler may be executed by several people simultaneously on a network – There will only be one copy in memory – Different parts of it will be used by several different people to compile their programs – They will share the same code – Each instance of the program running will be a proces ...
The LINUX Operating System
... • an OS initially created by Linus Torvalds (Finland) and a team working over the Internet; • developed from MINIX, a small Unix system; • An open and free operating system, adaptable to meet individuals needs; ...
... • an OS initially created by Linus Torvalds (Finland) and a team working over the Internet; • developed from MINIX, a small Unix system; • An open and free operating system, adaptable to meet individuals needs; ...
Memory Protection
... • Separation elements evolved in OS for safety as much as security • Memory protections – Segments and pages and rings ...
... • Separation elements evolved in OS for safety as much as security • Memory protections – Segments and pages and rings ...
Chapter 2: OS Structures
... • Mechanisms determine how to do something, policies decide what will be done – The separation of policy from mechanism is a very important principle, it allows maximum flexibility if policy decisions are to be changed later ...
... • Mechanisms determine how to do something, policies decide what will be done – The separation of policy from mechanism is a very important principle, it allows maximum flexibility if policy decisions are to be changed later ...
What is an Operating System
... lower-level (physical) resources (e.g., files). Definition: Is a collection of software enhancements, executed on the bare hardware, culminating in a high-level virtual machine that serves as an advanced programming environment ...
... lower-level (physical) resources (e.g., files). Definition: Is a collection of software enhancements, executed on the bare hardware, culminating in a high-level virtual machine that serves as an advanced programming environment ...
The Styx Architecture for Distributed Systems
... A distributed system is constructed from a set of relatively independent components that form a unified, but geographically and functionally diverse entity. Examples include networked operating systems, Internet services, the national telephone switching system, and in general all the technology usi ...
... A distributed system is constructed from a set of relatively independent components that form a unified, but geographically and functionally diverse entity. Examples include networked operating systems, Internet services, the national telephone switching system, and in general all the technology usi ...
Network Technology Foundations
... • Use symmetric-key encryption to scramble the original message you want to send • Use asymmetric-key encryption to encrypt only the symmetric key you just used • Use hash encryption to "sign" the message and ensure that no one can tamper with it ...
... • Use symmetric-key encryption to scramble the original message you want to send • Use asymmetric-key encryption to encrypt only the symmetric key you just used • Use hash encryption to "sign" the message and ensure that no one can tamper with it ...
Chapter One
... You work with UNIX by typing commands that you can learn by referring to the online manual called man pages; commands have specific syntax and allow you to see brief descriptions of commands, see who is logged in, display the system calendar, and log out ...
... You work with UNIX by typing commands that you can learn by referring to the online manual called man pages; commands have specific syntax and allow you to see brief descriptions of commands, see who is logged in, display the system calendar, and log out ...
bt0070 - SMU Assignments
... Q1. What is an Operating System? Explain the functions of OS. Answer: Answer: Operating System is a System Software (Set of system programs) which provides an environment to help the user to execute the programs. An operating system (OS) is a software program that manages the hardware and software r ...
... Q1. What is an Operating System? Explain the functions of OS. Answer: Answer: Operating System is a System Software (Set of system programs) which provides an environment to help the user to execute the programs. An operating system (OS) is a software program that manages the hardware and software r ...
Operating Systems - Mid Yell Junior High School
... Are our computers multi-user and/or multi-programming? Explain. ...
... Are our computers multi-user and/or multi-programming? Explain. ...
Protection A computer system is a collection of processes and
... As mentioned before, a computer system consists of processes and objects. Each object has a unique identifier in the system, and can be accessed only through well-defined and meaningul operations. For example, a memory segment (object) supports read and write (operations) while a CD-ROM (object) sup ...
... As mentioned before, a computer system consists of processes and objects. Each object has a unique identifier in the system, and can be accessed only through well-defined and meaningul operations. For example, a memory segment (object) supports read and write (operations) while a CD-ROM (object) sup ...
Computer Science 8530 Advanced Operating Systems Fall 2016
... ugly hardware and users.” Identify at least two major beautiful abstractions of significance to operating systems provided by the Multics operating system. Indicate if these abstractions are still being used in today’s operating systems. 2. Identify at least five significant features provided by ...
... ugly hardware and users.” Identify at least two major beautiful abstractions of significance to operating systems provided by the Multics operating system. Indicate if these abstractions are still being used in today’s operating systems. 2. Identify at least five significant features provided by ...
Slides - Dr. Choong
... Silberschatz, Galvin, and Gagne, Operating Systems Concepts, Seventh Edition, John Wiley and Sons, 2005. ...
... Silberschatz, Galvin, and Gagne, Operating Systems Concepts, Seventh Edition, John Wiley and Sons, 2005. ...
Chapter One
... You work with UNIX by typing commands that you can learn by referring to the online manual called man pages; commands have specific syntax and allow you to see brief descriptions of commands, see who is logged in, display the system calendar, and log out ...
... You work with UNIX by typing commands that you can learn by referring to the online manual called man pages; commands have specific syntax and allow you to see brief descriptions of commands, see who is logged in, display the system calendar, and log out ...
Software nature & capabilities - Computing and ICT in a Nutshell
... • The operating system communicates with the device through a driver. • A driver is a piece of software that translates the user’s instructions - e.g. that they want a particular piece of text to be bold - into the device-specific control codes that the particular hardware uses. ...
... • The operating system communicates with the device through a driver. • A driver is a piece of software that translates the user’s instructions - e.g. that they want a particular piece of text to be bold - into the device-specific control codes that the particular hardware uses. ...
systemsprinciples2
... – access control (e.g. checking file permissions on file open) – memory safety (process does not read/write outside its own memory space) – type safety (data accessed in accordance with type) ...
... – access control (e.g. checking file permissions on file open) – memory safety (process does not read/write outside its own memory space) – type safety (data accessed in accordance with type) ...
Chapter - 5th Semester Notes
... • An operating system provides an environment for the execution of programs. • Program execution – System capability to load a program into memory and to run it. – Program must be able to end its execution, either normally or abnormally (indicating error). ...
... • An operating system provides an environment for the execution of programs. • Program execution – System capability to load a program into memory and to run it. – Program must be able to end its execution, either normally or abnormally (indicating error). ...
Slide 1
... Operating System Concept: Process(1) • A process is basically a program in execution • Each process is associated with its address space which contains code segment, data segment, stack segment etc.) • A process can open several files. • Multitasking operating system – Can run multiple processes co ...
... Operating System Concept: Process(1) • A process is basically a program in execution • Each process is associated with its address space which contains code segment, data segment, stack segment etc.) • A process can open several files. • Multitasking operating system – Can run multiple processes co ...
Operating Systems - Villanova Computer Science
... • The pieces are stored on the hard disk as if it were additional RAM memory needed by the program. • The pieces are retrieved into RAM as needed. • Disadvantage: This slows the system down, because retrieval of information from the disk is time consuming. ...
... • The pieces are stored on the hard disk as if it were additional RAM memory needed by the program. • The pieces are retrieved into RAM as needed. • Disadvantage: This slows the system down, because retrieval of information from the disk is time consuming. ...
virtual machine
... and batch users. Many commands are given to the operating system by control statements which deal with: Process creation and management, Main-memory management, file-system access, I/O handling, secondary-storage management, Networking, Protection. ...
... and batch users. Many commands are given to the operating system by control statements which deal with: Process creation and management, Main-memory management, file-system access, I/O handling, secondary-storage management, Networking, Protection. ...