Slides - CSE
... • Problem of discretionary access control: untrusted processes can modify protection states • Mandatory protection system: – Subjects and objects represented by labels – Protection state: the operations that subject labels may perform on object labels – Labeling state: mapping objects to labels – Tr ...
... • Problem of discretionary access control: untrusted processes can modify protection states • Mandatory protection system: – Subjects and objects represented by labels – Protection state: the operations that subject labels may perform on object labels – Labeling state: mapping objects to labels – Tr ...
accounting for managers - Pailan College of Management and
... Course to be covered 7.1 Basic concepts of security Different kinds of threats Security principle Types of authentication Formal models of protection worms and viruses ...
... Course to be covered 7.1 Basic concepts of security Different kinds of threats Security principle Types of authentication Formal models of protection worms and viruses ...
Linux Concepts and key ideas
... What is an operating system? What is a kernel? An operating system is made up of software instructions that lie between the computer hardware and the application software. At the center is the kernel, which functions to control processes, handles memory management, and manages software and hardware ...
... What is an operating system? What is a kernel? An operating system is made up of software instructions that lie between the computer hardware and the application software. At the center is the kernel, which functions to control processes, handles memory management, and manages software and hardware ...
Unix History, and Background
... programs to run on different Unix variants. • As long as the operating system uses POSIX compliant mechanisms, it can run software regardless of the actual variant used. • POSIX standard (1003) is administered by IEEE (Institute of Electrical and Electronics Engineers) • The standard is also recogni ...
... programs to run on different Unix variants. • As long as the operating system uses POSIX compliant mechanisms, it can run software regardless of the actual variant used. • POSIX standard (1003) is administered by IEEE (Institute of Electrical and Electronics Engineers) • The standard is also recogni ...
Introduction - Virginia Tech
... system (including user programs) call on the kernel to perform services for them. The shell accepts user commands and is responsible for seeing that they are carried out. ...
... system (including user programs) call on the kernel to perform services for them. The shell accepts user commands and is responsible for seeing that they are carried out. ...
Introduction to Database Systems
... AUI is glued to operating systems kernel via the language libraries and system call interface. System calls- a set of functions that can be used by applications and library routines to start execution of the kernel code for particular service, reading or writing a file.. The kernel is the part of an ...
... AUI is glued to operating systems kernel via the language libraries and system call interface. System calls- a set of functions that can be used by applications and library routines to start execution of the kernel code for particular service, reading or writing a file.. The kernel is the part of an ...
My Problems: 1. Suppose that it is time for the operating system to
... means that the process needs to swap (take memory away from) another process (in the ready Q?) and thus is more time consuming. It also may lead to starvation. It does guarantee that the highest priority processes are executing. 2. Suppose that the operating system wishes to implement the two system ...
... means that the process needs to swap (take memory away from) another process (in the ready Q?) and thus is more time consuming. It also may lead to starvation. It does guarantee that the highest priority processes are executing. 2. Suppose that the operating system wishes to implement the two system ...
Language Based Operating Systems
... written in a language that is compiled to some intermediate language for execution or interpretation by a VM. Such languages are usually very high level (abstract) and provide expressive ...
... written in a language that is compiled to some intermediate language for execution or interpretation by a VM. Such languages are usually very high level (abstract) and provide expressive ...
Operating System Software The OS
... process, but that application may cause several other processes to begin, for tasks like communications with other devices or other computers. There are also numerous processes that run without giving you direct evidence that they ever exist. ...
... process, but that application may cause several other processes to begin, for tasks like communications with other devices or other computers. There are also numerous processes that run without giving you direct evidence that they ever exist. ...
83-381 Syllabus English
... First Semester 2016/17 Weekly hours: 2 lecture + 1 training 1) Course objectives: An operating system is a set of subsystems/programs that manage a computer system composed of hardware and software resources, providing common services/utilities needed to run system and user applications. All compute ...
... First Semester 2016/17 Weekly hours: 2 lecture + 1 training 1) Course objectives: An operating system is a set of subsystems/programs that manage a computer system composed of hardware and software resources, providing common services/utilities needed to run system and user applications. All compute ...
Unix
... % g++ -c mypgm.cpp or % CC –c mypgm.cpp NOTE: the –c option says to only compile. The CC are capital (lowercase cc is for C). ...
... % g++ -c mypgm.cpp or % CC –c mypgm.cpp NOTE: the –c option says to only compile. The CC are capital (lowercase cc is for C). ...
1.2 Operating System Structure
... • To overcome the issue of monolithic architecture by grouping components that performs similar functions into layers • Each layer communicates with those above and below it. • Lower-level layers provide services to higher-level layer using interfaces that hide their implementation • Layer OS are mo ...
... • To overcome the issue of monolithic architecture by grouping components that performs similar functions into layers • Each layer communicates with those above and below it. • Lower-level layers provide services to higher-level layer using interfaces that hide their implementation • Layer OS are mo ...
Unix
... % g++ -c mypgm.cpp or % CC –c mypgm.cpp NOTE: the –c option says to only compile. The CC are capital (lowercase cc is for C). ...
... % g++ -c mypgm.cpp or % CC –c mypgm.cpp NOTE: the –c option says to only compile. The CC are capital (lowercase cc is for C). ...
on Processes
... context of the execution: PC, SP, other registers control: scheduling (state, priority), resources (memory, opened files), IPC ...
... context of the execution: PC, SP, other registers control: scheduling (state, priority), resources (memory, opened files), IPC ...
Ch2. Operating System Structures
... or networked computer system may want to control use of that information, concurrent processes should not interfere with each other ...
... or networked computer system may want to control use of that information, concurrent processes should not interfere with each other ...
ppt
... • Most IPC implementations perform poorly • Really fast message passing systems are needed to run device drivers and other performance critical components at the user-level. • Result: programmers circumvent IPC, co-locating device drivers in the kernel and defeating the main purpose of the microkern ...
... • Most IPC implementations perform poorly • Really fast message passing systems are needed to run device drivers and other performance critical components at the user-level. • Result: programmers circumvent IPC, co-locating device drivers in the kernel and defeating the main purpose of the microkern ...
lecture2
... Linux is a UNIX-like operating system that runs on many different computers. Linux was first released in 1991 by its author Linus Torvalds at the University of Helsinki and developed by Linus Torvalds (author) and Andrew Morton. Linux is the operating system kernel, which comes with a distribution o ...
... Linux is a UNIX-like operating system that runs on many different computers. Linux was first released in 1991 by its author Linus Torvalds at the University of Helsinki and developed by Linus Torvalds (author) and Andrew Morton. Linux is the operating system kernel, which comes with a distribution o ...
Lec1 Intro
... The Unix OS was developed (based on Multics & CTSS operating systems) by Ken Thompson at the AT&T Bell Laboratories in 1969. He wanted to create an multi-user operating system to run “space travel” game. Ken’s philosophy was to create an operating system with commands or “utilities” that would do on ...
... The Unix OS was developed (based on Multics & CTSS operating systems) by Ken Thompson at the AT&T Bell Laboratories in 1969. He wanted to create an multi-user operating system to run “space travel” game. Ken’s philosophy was to create an operating system with commands or “utilities” that would do on ...
CCN3133 Computer System Principles
... Segmentation; Dynamic Link Library (DLL); System programming for memory management. Processor Scheduling Types of processor scheduling; Scheduling algorithms; Multiprocessor scheduling; Case Study. ...
... Segmentation; Dynamic Link Library (DLL); System programming for memory management. Processor Scheduling Types of processor scheduling; Scheduling algorithms; Multiprocessor scheduling; Case Study. ...
Unit OS1: The Evolution of Operating Systems
... Single user Multiuser/Timesharing Systems Management of multiple simultaneous users interconnected via terminals Fair resource management: CPU scheduling, spooling, mutual exclusion Real-Time Systems (process control systems) Management of time-critical processes High requirements with respect to re ...
... Single user Multiuser/Timesharing Systems Management of multiple simultaneous users interconnected via terminals Fair resource management: CPU scheduling, spooling, mutual exclusion Real-Time Systems (process control systems) Management of time-critical processes High requirements with respect to re ...
2. OS Components
... One of the most important systems programs for an operating system is the command interpreter, which is the interface between the user and the operating system. Some operating systems include the command interpreter in the kernel. Other operating systems, such as MS-DOS and UNIX, treat the command i ...
... One of the most important systems programs for an operating system is the command interpreter, which is the interface between the user and the operating system. Some operating systems include the command interpreter in the kernel. Other operating systems, such as MS-DOS and UNIX, treat the command i ...
Operating System
... • Example 1: main memory – divided up among several running programs – each one can be resident at the same time – keep track of • who is using which memory block ...
... • Example 1: main memory – divided up among several running programs – each one can be resident at the same time – keep track of • who is using which memory block ...
OS Services #1 File
... An operating system provides an environment for the execution of programs. It provides certain services to programs and to the users of those programs. These operating-system services are provided for the convenience of the programmer, to make the programming task easier. Program execution: The syst ...
... An operating system provides an environment for the execution of programs. It provides certain services to programs and to the users of those programs. These operating-system services are provided for the convenience of the programmer, to make the programming task easier. Program execution: The syst ...
