Introduction and History
... When there are multiple programs running, the OS must make each program feel like it solely owns the whole machine (CPU, memory, registers) – virtual machine for each process ...
... When there are multiple programs running, the OS must make each program feel like it solely owns the whole machine (CPU, memory, registers) – virtual machine for each process ...
Operating System
... 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 ...
... 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 ...
Operating Systems
... processing • Interactive • Accepting input from a human. • Interactive computer systems are programs that allow users to enter data or commands. • Most popular programs, such as word processors and spreadsheet applications, are interactive. • In interactive processing, the application responds to co ...
... processing • Interactive • Accepting input from a human. • Interactive computer systems are programs that allow users to enter data or commands. • Most popular programs, such as word processors and spreadsheet applications, are interactive. • In interactive processing, the application responds to co ...
Lecture 2
... – When a job issues an I/O request (e.g., open a file, read data from a file), it cannot continue until the request is fulfilled. – The CPU then becomes idle (the job is blocked on the request). ...
... – When a job issues an I/O request (e.g., open a file, read data from a file), it cannot continue until the request is fulfilled. – The CPU then becomes idle (the job is blocked on the request). ...
Lecture 1: Overview
... In a time-sharing system, multiple users simultaneously access the system through terminals, with the OS interleaving the execution of each user program in a short burst or quantum of computation. ...
... In a time-sharing system, multiple users simultaneously access the system through terminals, with the OS interleaving the execution of each user program in a short burst or quantum of computation. ...
Word Processors
... use of computers to people who had not learnt how to program a computer or can’t remember a lots of commands. ...
... use of computers to people who had not learnt how to program a computer or can’t remember a lots of commands. ...
Module 3: Operating
... 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 to read, write, create, and delete files. Communications – exchange of informatio ...
... 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 to read, write, create, and delete files. Communications – exchange of informatio ...
Module 3: Operating-System Structures
... 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 to read, write, create, and delete files. Communications – exchange of information betwee ...
... 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 to read, write, create, and delete files. Communications – exchange of information betwee ...
Principles of Operating System
... • a collection of one or more threads and associated system resources • programmer has greater control over the modularity of the application and the timing of application related events ...
... • a collection of one or more threads and associated system resources • programmer has greater control over the modularity of the application and the timing of application related events ...
Using FPGAs to create a complete computer system Marcela Melara
... File and Process Support • Added support for hard disk → file system! • User can work with files and directories through incorporated Shell program • Shell has timesharing capabilities to support multiple processes ...
... File and Process Support • Added support for hard disk → file system! • User can work with files and directories through incorporated Shell program • Shell has timesharing capabilities to support multiple processes ...
2.01 - Fordham University
... buffering (storing data temporarily while it is being transferred) caching (storing parts of data in faster storage for performance) spooling (overlapping of output of one job with input of other ...
... buffering (storing data temporarily while it is being transferred) caching (storing parts of data in faster storage for performance) spooling (overlapping of output of one job with input of other ...
Operating Systems I Introduction to Operating Systems MCT260-Operating Systems I
... components and that they are functional. • The last step is locating and loading the OS into RAM. MCT260-Operating Systems I ...
... components and that they are functional. • The last step is locating and loading the OS into RAM. MCT260-Operating Systems I ...
Part I 1. Introduction to Computers
... Store immediate data generated by the currently running programs ...
... Store immediate data generated by the currently running programs ...
2. OS Components
... The simplest approach is to pass the parameters in registers. In some cases, however, there may be more parameters than registers. In these cases, the parameters are generally stored in a block, or table, in memory, and the address of the block is passed as a parameter in a register. Parameter ...
... The simplest approach is to pass the parameters in registers. In some cases, however, there may be more parameters than registers. In these cases, the parameters are generally stored in a block, or table, in memory, and the address of the block is passed as a parameter in a register. Parameter ...
System Structures
... Why use APIs rather than system calls? (Note that the system-call names used throughout this text are generic) ...
... Why use APIs rather than system calls? (Note that the system-call names used throughout this text are generic) ...
N4Less11
... A dialog box is a special window that appears when a program or the OS needs more information before completing a task. ...
... A dialog box is a special window that appears when a program or the OS needs more information before completing a task. ...
ppt
... 1. RAM – (R/W) - Cannot guarantee integrity or confidentiality 2. ROM – built-in integrity guarantee, good for storing parts of an OS 3. EPROM – useful for storing parts of OS or crypto keys, advanced attacks may pose a threat 4. WROM – good for storing crypto keys, disks used for ...
... 1. RAM – (R/W) - Cannot guarantee integrity or confidentiality 2. ROM – built-in integrity guarantee, good for storing parts of an OS 3. EPROM – useful for storing parts of OS or crypto keys, advanced attacks may pose a threat 4. WROM – good for storing crypto keys, disks used for ...
Operating- System Structures
... is kept only where it is needed and is accessible only within a defined and restricted area, so any bugs affecting that data must be limited to a specific module or layer. ...
... is kept only where it is needed and is accessible only within a defined and restricted area, so any bugs affecting that data must be limited to a specific module or layer. ...
Lecture 3
... execution at interrupt vector location for TRAP instruction. Operating system looks at requested operation and any parameters passed by the application. Dispatches the correct system call handler through a table of pointers to system call handlers. Handler completes and (may) return to user code at ...
... execution at interrupt vector location for TRAP instruction. Operating system looks at requested operation and any parameters passed by the application. Dispatches the correct system call handler through a table of pointers to system call handlers. Handler completes and (may) return to user code at ...
Operating- System Structures
... List five services provided by an operating system. Explain how each provides convenience to the users. Explain also in which cases it would be impossible for user-level programs to provide these services. Answer: a. Program execution. The operating system loads the contents (or sections) of a file ...
... List five services provided by an operating system. Explain how each provides convenience to the users. Explain also in which cases it would be impossible for user-level programs to provide these services. Answer: a. Program execution. The operating system loads the contents (or sections) of a file ...
Design of OSes
... • Programming interface to services provided by the OS • Typically written in a high-level language (C or C++) • Mostly accessed by programs using APIs • Three most common APIs: – Win32 API for Windows – POSIX API for POSIX-based systems (UNIX, Linux, Mac OS X) – Java API for the Java virtual machin ...
... • Programming interface to services provided by the OS • Typically written in a high-level language (C or C++) • Mostly accessed by programs using APIs • Three most common APIs: – Win32 API for Windows – POSIX API for POSIX-based systems (UNIX, Linux, Mac OS X) – Java API for the Java virtual machin ...
THE BOOT PROCESS The Forensic Services Group 1.) Initiates
... c. Reads it into memory and tests for validity with hex 55AA the last two bytes of the sector. 13) MBR contains a 64 byte partition table located at byte offset 446 to 509. d. Reads table for boot indicator byte that marks active partitions. e. The MBR then reads the VBR of the active partition. f. ...
... c. Reads it into memory and tests for validity with hex 55AA the last two bytes of the sector. 13) MBR contains a 64 byte partition table located at byte offset 446 to 509. d. Reads table for boot indicator byte that marks active partitions. e. The MBR then reads the VBR of the active partition. f. ...
08 Operating System Support
... A batch of jobs is queued up and executed as rapidly as possible with no idle time ...
... A batch of jobs is queued up and executed as rapidly as possible with no idle time ...
View File
... correct and consistent computing • Debugging facilities can greatly enhance the user’s and programmer’s abilities to efficiently use the system ...
... correct and consistent computing • Debugging facilities can greatly enhance the user’s and programmer’s abilities to efficiently use the system ...
Acorn MOS
Acorn's Machine Operating System (MOS) or OS was a computer operating system used in the Acorn BBC computer range. It included support for four-channel sound and graphics, file system abstraction, and digital and analogue I/O including a daisy-chained fast expansion bus. The implementation was single-tasking, monolithic and non-reentrant.Versions 0.10 to 1.20 were used on the BBC Micro, version 1.00 on the Electron, version 2 was used on the B+, and versions 3 to 5 were used in the BBC Master Series range.The final BBC computer, the BBC A3000, was 32-bit and ran RISC OS. Its operating system used portions of the Acorn MOS architecture and shared a number of characteristics (commands, VDU system) with the earlier 8-bit MOS.Versions 0 and 1 of the MOS were 16KiB in size, written in 6502 machine code, and held in ROM on the motherboard. The upper quarter of the 16-bit address space (0xC000 to 0xFFFF) is reserved for its ROM code and I/O space.Versions 2 to 5 were still restricted to a 16KiB address space but managed to hold more code and hence more complex routines, partly because of the alternative 65C102 CPU with its denser instruction set plus the careful use of paging.