Chapter 11 I/O Management and Disk Scheduling
... organizing an OS into layers – Each layer performs a related subset of the functions required of OS – Each layer relies on the next lower layer to perform more primitive functions and to conceal the details of those functions – Each layer provides services to the next ...
... organizing an OS into layers – Each layer performs a related subset of the functions required of OS – Each layer relies on the next lower layer to perform more primitive functions and to conceal the details of those functions – Each layer provides services to the next ...
Chapter 9: File-System Interface
... None - sequence of words, bytes Simple record structure Lines Fixed length Variable length Complex Structures Formatted document Relocatable load file Can simulate last two with first method by inserting appropriate control characters Who decides: Operating system Program / programmer ...
... None - sequence of words, bytes Simple record structure Lines Fixed length Variable length Complex Structures Formatted document Relocatable load file Can simulate last two with first method by inserting appropriate control characters Who decides: Operating system Program / programmer ...
Quick UNIX Tutorial
... This implies that you may read files in the directory if you have read permission on the individual files. example: CS4315 ...
... This implies that you may read files in the directory if you have read permission on the individual files. example: CS4315 ...
An Introduction to MS-DOS
... These three functions can be called by application programs, by the command processor, and by the MS-DOS itself to dynamically free, allocate and resize arena entries. When the MS-DOS Kernel receives a memory allocation request, it inspects the chain of arena entry headers to find a free arena entry ...
... These three functions can be called by application programs, by the command processor, and by the MS-DOS itself to dynamically free, allocate and resize arena entries. When the MS-DOS Kernel receives a memory allocation request, it inspects the chain of arena entry headers to find a free arena entry ...
Operating Systems and File Management 4 Operating System
... To designate a file’s location, you must first specify the device where the file is stored The main hard disk usually is referred to as drive C ...
... To designate a file’s location, you must first specify the device where the file is stored The main hard disk usually is referred to as drive C ...
Chapter 7 Deadlocks
... Link in Directory Tree Structure In modern OS, there are mechanism that allow a file to appear to be in different part of the tree structure than where it actually ...
... Link in Directory Tree Structure In modern OS, there are mechanism that allow a file to appear to be in different part of the tree structure than where it actually ...
4 Operating System Activities
... 4 Operating System Activities Multitasking provides process and memory management services that allow two or more tasks, jobs, or programs to run simultaneously Within a single program, multithreading allows multiple parts, or threads, to run simultaneously When multiple programs are running, ...
... 4 Operating System Activities Multitasking provides process and memory management services that allow two or more tasks, jobs, or programs to run simultaneously Within a single program, multithreading allows multiple parts, or threads, to run simultaneously When multiple programs are running, ...
Layer 1 Process Management
... •Memory management in MINIX is simple: neither paging nor swapping is used. •The memory manager maintains a list of holes sorted in memory address order. Hole is the hole list is searched using first fit for a hole that is big enough. •Once a process is placed in memory, it remains in exactly the sa ...
... •Memory management in MINIX is simple: neither paging nor swapping is used. •The memory manager maintains a list of holes sorted in memory address order. Hole is the hole list is searched using first fit for a hole that is big enough. •Once a process is placed in memory, it remains in exactly the sa ...
資工系網媒所NEWS實驗室Chapter 13
... application does not open a file on the tape, it opens the whole tape drive as a raw device. Usually the tape drive is reserved for the exclusive use of that application. Since the OS does not provide file system services, the application must decide how to use the array of blocks. Since every appli ...
... application does not open a file on the tape, it opens the whole tape drive as a raw device. Usually the tape drive is reserved for the exclusive use of that application. Since the OS does not provide file system services, the application must decide how to use the array of blocks. Since every appli ...
Slide 1 - RSWiki
... application does not open a file on the tape, it opens the whole tape drive as a raw device. Usually the tape drive is reserved for the exclusive use of that application. Since the OS does not provide file system services, the application must decide how to use the array of blocks. Since every appli ...
... application does not open a file on the tape, it opens the whole tape drive as a raw device. Usually the tape drive is reserved for the exclusive use of that application. Since the OS does not provide file system services, the application must decide how to use the array of blocks. Since every appli ...
資工系網媒所NEWS實驗室
... application does not open a file on the tape, it opens the whole tape drive as a raw device. Usually the tape drive is reserved for the exclusive use of that application. Since the OS does not provide file system services, the application must decide how to use the array of blocks. Since every appli ...
... application does not open a file on the tape, it opens the whole tape drive as a raw device. Usually the tape drive is reserved for the exclusive use of that application. Since the OS does not provide file system services, the application must decide how to use the array of blocks. Since every appli ...
Operating Systems and File Management
... contains your computer’s current settings and device drivers • Norton Ghost is a product of Symantec, which also provides a more specialized recovery disk called the Symantec Recovery Disk ...
... contains your computer’s current settings and device drivers • Norton Ghost is a product of Symantec, which also provides a more specialized recovery disk called the Symantec Recovery Disk ...
Operating Systems
... map of the clusters (basic units of logical storage on a hard disk) that a file has been stored in • When you write a new file to a hard disk, the file is stored in one or more clusters that are not necessarily next to each other; they may be rather scattered over the disk ©2003 The McGraw-Hill Comp ...
... map of the clusters (basic units of logical storage on a hard disk) that a file has been stored in • When you write a new file to a hard disk, the file is stored in one or more clusters that are not necessarily next to each other; they may be rather scattered over the disk ©2003 The McGraw-Hill Comp ...
UNIX Operating System
... first starting with the target it is going to create. Make looks at each of the target’s dependencies to see if they are listed as targets. It follows the chain of dependencies until it reaches the end of the chain and then begins backing out and executing the commands found in each target's rule. A ...
... first starting with the target it is going to create. Make looks at each of the target’s dependencies to see if they are listed as targets. It follows the chain of dependencies until it reaches the end of the chain and then begins backing out and executing the commands found in each target's rule. A ...
Into to Linux Part 1-4
... – Organize files into folders and navigate the filesystem – Organize users and control permissions of what they can see and do – View and manage processes, services – Install and run programs and work with their output ...
... – Organize files into folders and navigate the filesystem – Organize users and control permissions of what they can see and do – View and manage processes, services – Install and run programs and work with their output ...
Chapter 11 I/O Management and Disk Scheduling
... • For stream-oriented I/O devices such as – terminals – printers – communication ports – mouse and other pointing devices, and – most other devices that are not secondary storage ...
... • For stream-oriented I/O devices such as – terminals – printers – communication ports – mouse and other pointing devices, and – most other devices that are not secondary storage ...
OS Structures and Java
... program received a segmentation fault? To read data from a file, why do we need to call open and close the file? In other words, why doesn’t OS allow read( filename, data, size )? If your C++ program terminates upon an exception, it may not print out a cout statement that must have been executed bef ...
... program received a segmentation fault? To read data from a file, why do we need to call open and close the file? In other words, why doesn’t OS allow read( filename, data, size )? If your C++ program terminates upon an exception, it may not print out a cout statement that must have been executed bef ...
Assignment0: Linux Basics and /proc
... makes /proc the current directory. Once you have made /proc the current directory, you can list its contents by using the ls command. The contents appear to be ordinary files and directories. However, a file in /proc or one of its subdirectories is actually a program that reads kernel variables and ...
... makes /proc the current directory. Once you have made /proc the current directory, you can list its contents by using the ls command. The contents appear to be ordinary files and directories. However, a file in /proc or one of its subdirectories is actually a program that reads kernel variables and ...
REF Chapter 3: Windows NT System Specifics
... as logical names) in place of part or all of a frequently-used file descriptor. An environment variable is used to achieve device/file independence by associating a physical file on the operating system with some other name that is resolved at run time. To accomplish this, Windows environment variab ...
... as logical names) in place of part or all of a frequently-used file descriptor. An environment variable is used to achieve device/file independence by associating a physical file on the operating system with some other name that is resolved at run time. To accomplish this, Windows environment variab ...
WHAT IS THE DOS BOOT SEQUENCE??
... commands that tell DOS how many files it can open at any one time (FILE=) and how many file buffers (a temporary holding area for a file) to create (BUFFERS=). It also contains the commands to load device drivers (small programs that tell your computer how to communicate with devices such as printer ...
... commands that tell DOS how many files it can open at any one time (FILE=) and how many file buffers (a temporary holding area for a file) to create (BUFFERS=). It also contains the commands to load device drivers (small programs that tell your computer how to communicate with devices such as printer ...
1. design principle
... more reliable than Sparc-x86? The choice between two operating system is a complex issue and it is decided after considering a lot of factors including performance and efficiency. This paper deals with comparing a powerful computer operating system developed by Bell labs namely Unix and an operating ...
... more reliable than Sparc-x86? The choice between two operating system is a complex issue and it is decided after considering a lot of factors including performance and efficiency. This paper deals with comparing a powerful computer operating system developed by Bell labs namely Unix and an operating ...
Operating Systems File System File System File System Functions
... ID of the person who created the file Current owner 0 for read/write; 1 for read only 0 for normal; 1 for do not display in listings 0 for normal files; 1 for system file 0 for has been backed up; 1 for needs to be backed up 0 for ASCII file; 1 for binary file 0 for sequential access only; 1 for ran ...
... ID of the person who created the file Current owner 0 for read/write; 1 for read only 0 for normal; 1 for do not display in listings 0 for normal files; 1 for system file 0 for has been backed up; 1 for needs to be backed up 0 for ASCII file; 1 for binary file 0 for sequential access only; 1 for ran ...