Module 3: Operating
... Accounting – keep track of and record which users use how much and what kinds of computer resources for account billing or for accumulating usage statistics. Protection – ensuring that all access to system resources is controlled, ex: firewalls, passwords, file permissions, etc. ...
... Accounting – keep track of and record which users use how much and what kinds of computer resources for account billing or for accumulating usage statistics. Protection – ensuring that all access to system resources is controlled, ex: firewalls, passwords, file permissions, etc. ...
What is an Operating System?
... The program that reads and interprets control statements is called variously: – control-card interpreter – command-line interpreter – shell (in UNIX) ...
... The program that reads and interprets control statements is called variously: – control-card interpreter – command-line interpreter – shell (in UNIX) ...
Chapter 8 - Operating Systems And Utility Programs - Elearning-KL
... Causes monitor’s screen to display moving image or blank screen if there is no activity for a specified time ...
... Causes monitor’s screen to display moving image or blank screen if there is no activity for a specified time ...
1.01 - Kau
... Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing ...
... Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing ...
Operating System Structure
... System goals – operating system should be easy to design, implement, and maintain, as well as flexible, reliable, error-free, and efficient ...
... System goals – operating system should be easy to design, implement, and maintain, as well as flexible, reliable, error-free, and efficient ...
ppt
... by Linus Torvalds, with the major design goal of UNIX compatibility, released as open source Its history has been one of collaboration by many users from all around the world, corresponding almost exclusively over the Internet It has been designed to run efficiently and reliably on ...
... by Linus Torvalds, with the major design goal of UNIX compatibility, released as open source Its history has been one of collaboration by many users from all around the world, corresponding almost exclusively over the Internet It has been designed to run efficiently and reliably on ...
Osprey: Operating System for Predictable Clouds
... some system libraries) and translates them all to native Osprey system calls. It also provides legacy file systems. Compared to a system emulation for binary compatibility, a libOS is more efficient because it runs in the same address space as the user application. It has been shown that a libOS can ...
... some system libraries) and translates them all to native Osprey system calls. It also provides legacy file systems. Compared to a system emulation for binary compatibility, a libOS is more efficient because it runs in the same address space as the user application. It has been shown that a libOS can ...
Glossary - Cengage
... device driver — Computer software designed to provide the operating system and application software access to specific computer hardware. device special file — File used in UNIX/ Linux for managing I/O devices. Can be one of two types: block special file or character special file. ...
... device driver — Computer software designed to provide the operating system and application software access to specific computer hardware. device special file — File used in UNIX/ Linux for managing I/O devices. Can be one of two types: block special file or character special file. ...
Operating system structures
... User mode and kernel mode Mode bit provided by hardware Provides ability to distinguish when system is running user code or kernel code Some instructions designated as privileged, only executable in kernel mode ...
... User mode and kernel mode Mode bit provided by hardware Provides ability to distinguish when system is running user code or kernel code Some instructions designated as privileged, only executable in kernel mode ...
Introduction to Linux
... freeware product called Minix were written by Andrew S. Tanenbaum. Developed by Andrew S.Tanenbaum, Minix was a clone of the commercial UNIX operating system. Linux version 0.02, released on October 5, 1991, consisted of only the Linux kernel and three utilities: ■ bash : a command-line interface ■ ...
... freeware product called Minix were written by Andrew S. Tanenbaum. Developed by Andrew S.Tanenbaum, Minix was a clone of the commercial UNIX operating system. Linux version 0.02, released on October 5, 1991, consisted of only the Linux kernel and three utilities: ■ bash : a command-line interface ■ ...
Introduction - Computer Science
... reliability: what happens if something goes wrong – hardware or software extensibility: can we add new features? communication: how do programs exchange information concurrency: how are parallel activities created and controlled? scale: what happens as demands or resources increase? persistence: how ...
... reliability: what happens if something goes wrong – hardware or software extensibility: can we add new features? communication: how do programs exchange information concurrency: how are parallel activities created and controlled? scale: what happens as demands or resources increase? persistence: how ...
comp1214-3-os-concepts
... • The processor enters user mode: – By an instruction (which sets the respective register in the CPU) ...
... • The processor enters user mode: – By an instruction (which sets the respective register in the CPU) ...
CENG334 Introduction to Operating Systems
... Open Files Most file operations require searching the directory for the entry associated with the file. To avoid this constant search, most systems require that file be “open”ed, before its use. open(Fi) – search the directory structure on disk for entry Fi, and move the content of entry to memor ...
... Open Files Most file operations require searching the directory for the entry associated with the file. To avoid this constant search, most systems require that file be “open”ed, before its use. open(Fi) – search the directory structure on disk for entry Fi, and move the content of entry to memor ...
The History of Amoeba
... traveling sales men problem, factoring, and make files. All of these problems can potentially take a long time. Factoring traditionally has a horrible time to figure out for any given problem. This is why factoring is used in current encryption techniques, because it is takes so long to brute force. ...
... traveling sales men problem, factoring, and make files. All of these problems can potentially take a long time. Factoring traditionally has a horrible time to figure out for any given problem. This is why factoring is used in current encryption techniques, because it is takes so long to brute force. ...
a login shell
... sh: the Bourne shell (creator: Steve Bourne). – the oldest of the shells, available on most UNIX systems. Some systems have replaced sh with a newer shell, like ksh or bash, that has the features of sh and more.) – a bit primitive and lacks job control features (the ability to move jobs from the for ...
... sh: the Bourne shell (creator: Steve Bourne). – the oldest of the shells, available on most UNIX systems. Some systems have replaced sh with a newer shell, like ksh or bash, that has the features of sh and more.) – a bit primitive and lacks job control features (the ability to move jobs from the for ...
The concept of operating system
... b)Asynchronous operation After I/O starts, control returns to user program without waiting for I/O completion. System call – request to the operating system to allow user to wait for I/O completion. Device-status table contains entry for each I/O device indicating its type, address, and state. O ...
... b)Asynchronous operation After I/O starts, control returns to user program without waiting for I/O completion. System call – request to the operating system to allow user to wait for I/O completion. Device-status table contains entry for each I/O device indicating its type, address, and state. O ...
Computer Network and Infrastructure
... clients cannot not directly access hardware Provides a uniform means fro applications to communicate via LPC Provides base for distributed computing ...
... clients cannot not directly access hardware Provides a uniform means fro applications to communicate via LPC Provides base for distributed computing ...
9781439079201_PPT_ch14
... Displays directories and subdirectories In hierarchical order and indented list Options allow file deletion while tree generated TREE /F • Displays filenames in each directory • Used to delete duplicated file on different directories ...
... Displays directories and subdirectories In hierarchical order and indented list Options allow file deletion while tree generated TREE /F • Displays filenames in each directory • Used to delete duplicated file on different directories ...
Operating System Concepts for System Programmers
... is called booting process. Following are the various steps involved while booting the OS: The BIOS program present in the non-volatile (ROM/Flash) memory of a computer will run first. In fact whenever a CPU is powered on, it tries to fetch (read) instructions from a fixed start address. The computer ...
... is called booting process. Following are the various steps involved while booting the OS: The BIOS program present in the non-volatile (ROM/Flash) memory of a computer will run first. In fact whenever a CPU is powered on, it tries to fetch (read) instructions from a fixed start address. The computer ...
COSC A365 Chapter 2
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. ...
... I/O operations - A running program may require I/O, which may involve a file or an I/O device. ...
Operating Systems
... – Learning the basic OS concepts and how to use them are essential – Concepts are taught alongside practical skills ...
... – Learning the basic OS concepts and how to use them are essential – Concepts are taught alongside practical skills ...
Plan 9 from Bell Labs
Plan 9 from Bell Labs is a distributed operating system, originally developed by the Computing Sciences Research Center at Bell Labs between the mid-1980s and 2002. It takes some of the principles of Unix, developed in the same research group, but extends these to a networked environment with graphics terminals.In Plan 9, virtually all computing resources, including files, network connections, and peripheral devices, are represented through the file system rather than specialized interfaces. A unified network protocol called 9P ties a network of computers running Plan 9 together, allowing them to share all resources so represented.The name Plan 9 from Bell Labs is a reference to the Ed Wood 1959 cult science fiction Z-movie Plan 9 from Outer Space. Also, Glenda, the Plan 9 Bunny, is presumably a reference to Wood's film Glen or Glenda. The system continues to be used and developed by operating system researchers and hobbyists.