OPERATING- SYSTEM CONCEPTS with Java
... lines, such as a high-speed bus or local area network. h. Clustered. A clustered system combines multiple computers into a single system to perform computational task distributed across the cluster. i. Handheld. A small computer system that performs simple tasks such as calendars, email, and web bro ...
... lines, such as a high-speed bus or local area network. h. Clustered. A clustered system combines multiple computers into a single system to perform computational task distributed across the cluster. i. Handheld. A small computer system that performs simple tasks such as calendars, email, and web bro ...
Security of Cookies in a computer lab setting
... • Intercept the web browser and clean after exiting – High security, cleans up cookies when the user shuts down the web browser – Mischievous user may “disable” the program in some fashion – Program may crash ...
... • Intercept the web browser and clean after exiting – High security, cleans up cookies when the user shuts down the web browser – Mischievous user may “disable” the program in some fashion – Program may crash ...
What is an Operating System?
... 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 the smallest convenient chunk of storage. For example, most computers don’t have an instruction to move a bit ...
... 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 the smallest convenient chunk of storage. For example, most computers don’t have an instruction to move a bit ...
PowerPoint Chapter 13
... Determine device holding file Translate name to device representation Physically read data from disk into buffer Make data available to requesting process Return control to process ...
... Determine device holding file Translate name to device representation Physically read data from disk into buffer Make data available to requesting process Return control to process ...
Chapter 13: I/O Systems I/O Hardware
... ✦ Determine device holding file ✦ Translate name to device representation ✦ Physically read data from disk into buffer ✦ Make data available to requesting process ✦ Return control to process ...
... ✦ Determine device holding file ✦ Translate name to device representation ✦ Physically read data from disk into buffer ✦ Make data available to requesting process ✦ Return control to process ...
(Silberschatz) I/O subsystems
... Key to performance Spooling - hold output for a device If device can serve only one request at a time i.e., Printing Device reservation - provides exclusive access to a ...
... Key to performance Spooling - hold output for a device If device can serve only one request at a time i.e., Printing Device reservation - provides exclusive access to a ...
CS 519: Operating System Theory
... Memory Abstraction: Virtual memory Virtual memory is a memory abstraction: illusion of large contiguous memory, often more memory than physically available application: ...
... Memory Abstraction: Virtual memory Virtual memory is a memory abstraction: illusion of large contiguous memory, often more memory than physically available application: ...
Errors and Exception Handling
... Optimize physical resources (disk, memory, power) File Systems can optimize I/O access for mechanical nature of disks ...
... Optimize physical resources (disk, memory, power) File Systems can optimize I/O access for mechanical nature of disks ...
Chapter 3 Operating-System Structures 2
... Operating System Services • Program execution – system capability to load a program into memory and to run it. • I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. • File-system manipulation – program capability ...
... Operating System Services • Program execution – system capability to load a program into memory and to run it. • I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. • File-system manipulation – program capability ...
CAAM 420 Fall 2012 Lecture 02
... VirtualBox is an open source software that runs on Windows, Linux, Macintosh and Solaris hosts and supports a large number of guest operating systems(OS) (https://www.virtualbox.org). The major advantage of the VirtualBox is that it lets us run more than one operating system at the same time, this w ...
... VirtualBox is an open source software that runs on Windows, Linux, Macintosh and Solaris hosts and supports a large number of guest operating systems(OS) (https://www.virtualbox.org). The major advantage of the VirtualBox is that it lets us run more than one operating system at the same time, this w ...
第二章
... routine generally, through the interrupt vector, which contains the addresses of all the service routines. 通常中断通过中断矢量把控制传送给中断服务程序，该中 断矢量包含了所有服务程序的地址 Interrupt architecture must save the address of the interrupted instruction. 中断体系结构必须保护被中断指令的地址 Incoming interrupts are disabled while another inte ...
... routine generally, through the interrupt vector, which contains the addresses of all the service routines. 通常中断通过中断矢量把控制传送给中断服务程序，该中 断矢量包含了所有服务程序的地址 Interrupt architecture must save the address of the interrupted instruction. 中断体系结构必须保护被中断指令的地址 Incoming interrupts are disabled while another inte ...
Chapter 1: Introduction
... The operating system is responsible for the following activities in connection with process management: Creating and deleting both user and system processes Suspending and resuming processes Providing mechanisms for process synchronization Providing mechanisms for process communication ...
... The operating system is responsible for the following activities in connection with process management: Creating and deleting both user and system processes Suspending and resuming processes Providing mechanisms for process synchronization Providing mechanisms for process communication ...
ppt
... Many systems now servers, responding to requests generated by clients Compute-server provides an interface to client to request ...
... Many systems now servers, responding to requests generated by clients Compute-server provides an interface to client to request ...
ch1
... Many systems now servers, responding to requests generated by clients Compute-server provides an interface to client to request ...
... Many systems now servers, responding to requests generated by clients Compute-server provides an interface to client to request ...
e-Security extra notes
... Virtual private networks (VPNs)—use public Internet to carry information but remains private Encryption—scramble communications Authentication—ensure information remains untampered with and comes from legitimate source Access control—verify identity of anyone using network Prentice Hall, 2002 ...
... Virtual private networks (VPNs)—use public Internet to carry information but remains private Encryption—scramble communications Authentication—ensure information remains untampered with and comes from legitimate source Access control—verify identity of anyone using network Prentice Hall, 2002 ...
Document
... Each device controller is in charge of a particular device type Each device controller has a local buffer CPU moves data from/to main memory to/from local buffers I/O is from the device to local buffer of controller ...
... Each device controller is in charge of a particular device type Each device controller has a local buffer CPU moves data from/to main memory to/from local buffers I/O is from the device to local buffer of controller ...
ch2
... concurrently, resources must be allocated to each of them Many types of resources - Some (such as CPU cycles, main memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code. Accounting - To keep track of which users use how ...
... concurrently, resources must be allocated to each of them Many types of resources - Some (such as CPU cycles, main memory, and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code. Accounting - To keep track of which users use how ...
Processes and Threads - University of Waterloo
... All threads in the same process are represented by a single kernel thread. They are called user-level threads because the kernel is unaware of their existence. A user-level thread library provides functions for thread creation, termination, yielding, and synchronization. ...
... All threads in the same process are represented by a single kernel thread. They are called user-level threads because the kernel is unaware of their existence. A user-level thread library provides functions for thread creation, termination, yielding, and synchronization. ...
Computer Security And The Law: What You Can Do To Protect
... As stated in the abstract, the laws to be discussed are: • Public Law 99-474: The Computer Fraud and Abuse Act of 1986 • Public Law 100-235: The Computer Security Act of 1987 The Computer Fraud and Abuse Act of 1986 Public Law 99-474, US Code, Title 18, Section 30, is also known as the Computer Frau ...
... As stated in the abstract, the laws to be discussed are: • Public Law 99-474: The Computer Fraud and Abuse Act of 1986 • Public Law 100-235: The Computer Security Act of 1987 The Computer Fraud and Abuse Act of 1986 Public Law 99-474, US Code, Title 18, Section 30, is also known as the Computer Frau ...
No Slide Title - ECE Users Pages
... I/O Requests to Hardware Operations Consider reading a file from disk for a process: Determine device holding file Translate name to device representation Physically read data from disk into buffer Make data available to requesting process Return control to process ...
... I/O Requests to Hardware Operations Consider reading a file from disk for a process: Determine device holding file Translate name to device representation Physically read data from disk into buffer Make data available to requesting process Return control to process ...
Linux For Beginners - Hazelwood Linux Users Group
... result of efforts by thousands of programmers coordinating via ...
... result of efforts by thousands of programmers coordinating via ...
Remote Access—Attack Vectors
... This was the case with Cisco VPNs that had a bug when processing extended communities. Cisco’s VPNs incorrectly used a corrupted route target (RT) to forward traffic, causing a leak—from one VPN to another. The solution to these leaks, aside from vendor patches, is hardening a system specifically to ...
... This was the case with Cisco VPNs that had a bug when processing extended communities. Cisco’s VPNs incorrectly used a corrupted route target (RT) to forward traffic, causing a leak—from one VPN to another. The solution to these leaks, aside from vendor patches, is hardening a system specifically to ...
Chapter 2
... The RAM address space is shared; No memory protection from each other The stacks of each thread are intended to be in separate RAM, but if one thread has a problem (e.g., with pointers or array addressing), it could write over the stack of another thread ...
... The RAM address space is shared; No memory protection from each other The stacks of each thread are intended to be in separate RAM, but if one thread has a problem (e.g., with pointers or array addressing), it could write over the stack of another thread ...
2K: A Component-Based Network-Centric Operating System for the
... ORB interface’s responsibility is to decouple applications from implementation details. This interface provides various helper functions such as converting object references to strings, and creating argument lists for requests made through the dynamic invocation interface. Interfaces for objects are ...
... ORB interface’s responsibility is to decouple applications from implementation details. This interface provides various helper functions such as converting object references to strings, and creating argument lists for requests made through the dynamic invocation interface. Interfaces for objects are ...