ICS 111 - University of Hawaii
... – A file is a logical storage unit which is an abstraction of physical properties • For example, the user does not have to think about exactly how a file is stored on a magnetic disk, as these details are abstracted away by the OS – Disk surface is logically divided into tracks, which are subdivided ...
... – A file is a logical storage unit which is an abstraction of physical properties • For example, the user does not have to think about exactly how a file is stored on a magnetic disk, as these details are abstracted away by the OS – Disk surface is logically divided into tracks, which are subdivided ...
ppt
... How can the kernel be eliminated from the call path on SMMPs with user-level threads? To a thread URPC is synchronous, but to the thread library it is asynchronous … explain. Why do kernel thread switches have long term cache and TLB effects that user thread switches do not? ...
... How can the kernel be eliminated from the call path on SMMPs with user-level threads? To a thread URPC is synchronous, but to the thread library it is asynchronous … explain. Why do kernel thread switches have long term cache and TLB effects that user thread switches do not? ...
1.01 - Kau
... 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 ...
... 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 ...
1.01 - University of South Florida
... System goals –easy to design, implement, and maintain, as well as flexible, reliable, error-free, and efficient ...
... System goals –easy to design, implement, and maintain, as well as flexible, reliable, error-free, and efficient ...
PPT slides - SIUE Computer Science
... In the previous example, we discussed process management as an example of resource management, similar (but different) resource management is performed for every and each resource available in a computer system Examples • Memory management (how much for which program? • Printer spooling (= assign th ...
... In the previous example, we discussed process management as an example of resource management, similar (but different) resource management is performed for every and each resource available in a computer system Examples • Memory management (how much for which program? • Printer spooling (= assign th ...
Operating Systems
... where # is the number of the Linux server that you have connected to. You may use any of the Linux servers. • The number in the brackets will change as you work. It is the “number” of the command that you are about to type. • If this prompt is not on the screen at any time, you are not communicating ...
... where # is the number of the Linux server that you have connected to. You may use any of the Linux servers. • The number in the brackets will change as you work. It is the “number” of the command that you are about to type. • If this prompt is not on the screen at any time, you are not communicating ...
Processes and Threads
... • Shared memory is the simplest way in which two processes can communicate with each other. By default, two separate processes have two separate memory images, and do not share any memory. (Note: a forked child has the same memory image as the parent at creation, but any changes made to the child’s ...
... • Shared memory is the simplest way in which two processes can communicate with each other. By default, two separate processes have two separate memory images, and do not share any memory. (Note: a forked child has the same memory image as the parent at creation, but any changes made to the child’s ...
Lecture 1 - WordPress.com
... Data Integrity - assurance that data received is as sent by an authorized entity Non-Repudiation - protection against denial by one of the parties in a communication Availability – resource accessible/usable ...
... Data Integrity - assurance that data received is as sent by an authorized entity Non-Repudiation - protection against denial by one of the parties in a communication Availability – resource accessible/usable ...
PPTX - Duke Computer Science
... as dynamic code loading and shared memory, were not in Multics’ immediate successors (early versions of UNIX [35] or early PC operating systems), today’s systems, such as FreeBSD, Linux, Solaris, and Windows, embrace …the open process architecture. The open process architecture is commonly used to e ...
... as dynamic code loading and shared memory, were not in Multics’ immediate successors (early versions of UNIX [35] or early PC operating systems), today’s systems, such as FreeBSD, Linux, Solaris, and Windows, embrace …the open process architecture. The open process architecture is commonly used to e ...
solutions - CIS @ UPenn
... functions that limit the size of the operation such as strncpy instead of strcpy 2. Prove that if any message can be lost, it is not possible for two processes to agree on non-trivial outcome using only messages for communication. Answer: see the lecture note on distributed systems. 3. For the follo ...
... functions that limit the size of the operation such as strncpy instead of strcpy 2. Prove that if any message can be lost, it is not possible for two processes to agree on non-trivial outcome using only messages for communication. Answer: see the lecture note on distributed systems. 3. For the follo ...
The concept of operating system
... User mode vs. 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 System call changes mode to kernel, return from call resets it to user ...
... User mode vs. 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 System call changes mode to kernel, return from call resets it to user ...
2.01 - SEJONG
... Some of them are simply user interfaces to system calls; others are considerably ...
... Some of them are simply user interfaces to system calls; others are considerably ...
[ppt
... overlooking a few of these issues. The solution adopted was to canonicalize in the kernel after copying the filenames. ...
... overlooking a few of these issues. The solution adopted was to canonicalize in the kernel after copying the filenames. ...
Wally Mead - ConfigMgr 2012 SP1 Slidedeck - November
... • Install new version of operating system on existing client or server hardware • Reinstall applications under new operating system • For clients, securely save/restore user state and settings (locally or on a file server) ...
... • Install new version of operating system on existing client or server hardware • Reinstall applications under new operating system • For clients, securely save/restore user state and settings (locally or on a file server) ...
COSC A365 Chapter 2
... and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code. ...
... and file storage) may have special allocation code, others (such as I/O devices) may have general request and release code. ...
Viruses - University of Windsor
... Attach a (secret) program -- to the regular program for listing the user’s files in a particular format. The attached program may change the file permissions to make them readable by any user. After the program is executed, any one can read the files. ...
... Attach a (secret) program -- to the regular program for listing the user’s files in a particular format. The attached program may change the file permissions to make them readable by any user. After the program is executed, any one can read the files. ...
Guide-to-UNIX-Using-Linux-4th-Edition-Michael-Palmer-Test-Bank
... 30. A(n) ____________________ computer system, or PC, is usually a stand-alone machine, such as a desktop or laptop computer. 31. UNIX/Linux are ____________________ operating systems, which means that these systems can be used in a variety of computing environments. 32. ____________________ (FTP) i ...
... 30. A(n) ____________________ computer system, or PC, is usually a stand-alone machine, such as a desktop or laptop computer. 31. UNIX/Linux are ____________________ operating systems, which means that these systems can be used in a variety of computing environments. 32. ____________________ (FTP) i ...
Computer Network and Infrastructure
... A program in execution An instance of a program running on a computer The entity that can be assigned to and executed on a processor A unit of activity characterized by a single sequential thread of execution, a current state, and an associated set of system resources ...
... A program in execution An instance of a program running on a computer The entity that can be assigned to and executed on a processor A unit of activity characterized by a single sequential thread of execution, a current state, and an associated set of system resources ...
Problems - Eastern Mediterranean University
... a) ………OS………… is a program that acts as an intermediary between a user of a computer and the computer hardware. b) CPU Scheduling choose among several jobs ready to run. The system must know their exact locations in memory. c) In computer systems generally we have two communication models. With these ...
... a) ………OS………… is a program that acts as an intermediary between a user of a computer and the computer hardware. b) CPU Scheduling choose among several jobs ready to run. The system must know their exact locations in memory. c) In computer systems generally we have two communication models. With these ...
Basic Operating System Concepts
... • A critical section is the code that accesses shared data or resources. • A solution to the critical section problem must ensure that only one process at a time can execute its critical section (CS). • Two separate shared resources can be accessed concurrently. ...
... • A critical section is the code that accesses shared data or resources. • A solution to the critical section problem must ensure that only one process at a time can execute its critical section (CS). • Two separate shared resources can be accessed concurrently. ...
Chapter10
... • A little History of Operating Systems • Be familiar with current Major Operating Systems • Contrast Applications Software and Systems Software • Describe the main responsibilities of an operating system ...
... • A little History of Operating Systems • Be familiar with current Major Operating Systems • Contrast Applications Software and Systems Software • Describe the main responsibilities of an operating system ...
Implementing Processes, Threads, and Resources
... • The OS is an overhead function should not use too much of machine’s resources • Minimum functionality is to implement abstractions • Additional function must be traded off against performance – DOS: one process – UNIX: low level file system ...
... • The OS is an overhead function should not use too much of machine’s resources • Minimum functionality is to implement abstractions • Additional function must be traded off against performance – DOS: one process – UNIX: low level file system ...
Computer Software
... Need a formal definition here! The software that controls the computer’s use of its hardware. Basic default functions, design, menus and interactivity are often part of/exclusive to the devices particular OS Acts as an interface between application software and hardware. ...
... Need a formal definition here! The software that controls the computer’s use of its hardware. Basic default functions, design, menus and interactivity are often part of/exclusive to the devices particular OS Acts as an interface between application software and hardware. ...
ch2
... Accounting - To keep track of which users use how much and what kinds of computer resources ...
... Accounting - To keep track of which users use how much and what kinds of computer resources ...
monitor
... Compare configurations with best practices Document all deviations with appropriate approvals All temporary deviations are reversed ...
... Compare configurations with best practices Document all deviations with appropriate approvals All temporary deviations are reversed ...