over view of operating system
... When it has to wait (for I/O for example), OS switches to another job 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 ...
... When it has to wait (for I/O for example), OS switches to another job 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 ...
virtual machine
... Command-interpreter is the interface between the user and the operating system. Character-based and GUIbased interpreters. Command-interpreter can be used for both interactive and batch users. Many commands are given to the operating system by control statements which deal with: Process creation a ...
... Command-interpreter is the interface between the user and the operating system. Character-based and GUIbased interpreters. Command-interpreter can be used for both interactive and batch users. Many commands are given to the operating system by control statements which deal with: Process creation a ...
Solaris System Management - Understanding System Concepts -
... Use the ps command to list the running processes. – ps –ef ...
... Use the ps command to list the running processes. – ps –ef ...
PPT - Course Website Directory
... Windows does not have signals, links to files, …, but has a large number of system calls for managing GUI CS 423 - Fall 2011 ...
... Windows does not have signals, links to files, …, but has a large number of system calls for managing GUI CS 423 - Fall 2011 ...
Protection
... exception, which is safely handled by the OS More generally, no user mode code should ever be a security vulnerability. Unless the OS has a bug… ...
... exception, which is safely handled by the OS More generally, no user mode code should ever be a security vulnerability. Unless the OS has a bug… ...
How-OS-Works.pdf
... If a command line is used, a file named autoexec.bat is executed, to configure the system for the user. Steps in most autoexec.bat files @echo off Suppress the display until the batch file is finished path c:\DOS ...
... If a command line is used, a file named autoexec.bat is executed, to configure the system for the user. Steps in most autoexec.bat files @echo off Suppress the display until the batch file is finished path c:\DOS ...
Memory Protection: Kernel and User Address Spaces
... Address Translation Each process is associated with an address space, or all the physical addresses a process can touch However, each process believes that it owns the entire memory, starting with the virtual address 0 The missing piece is a translation table Translate every memory referenc ...
... Address Translation Each process is associated with an address space, or all the physical addresses a process can touch However, each process believes that it owns the entire memory, starting with the virtual address 0 The missing piece is a translation table Translate every memory referenc ...
Answers to Even-numbered Exercises
... The Free Software Foundation (www.fsf.org) is the principal organizational sponsor of the GNU Project. GNU developed many of the tools, including the C compiler, that are part of the Linux operating system. Linux is the name of the operating system kernel developed by Linus Torvalds, which has since ...
... The Free Software Foundation (www.fsf.org) is the principal organizational sponsor of the GNU Project. GNU developed many of the tools, including the C compiler, that are part of the Linux operating system. Linux is the name of the operating system kernel developed by Linus Torvalds, which has since ...
Introduction - Stanford Secure Computer Systems Group
... • Protect mem. of one program from actions of another • Definitions - Address space: all memory locations a program can name - Virtual address: addresses in process’ address space - Physical address: address of real memory - Translation: map virtual to physical addresses ...
... • Protect mem. of one program from actions of another • Definitions - Address space: all memory locations a program can name - Virtual address: addresses in process’ address space - Physical address: address of real memory - Translation: map virtual to physical addresses ...
COS 318: Operating Systems OS Structures and System Calls Prof. Margaret Martonosi
... Pass by a memory vector (list) Single register for starting address Vector in user’s memory ...
... Pass by a memory vector (list) Single register for starting address Vector in user’s memory ...
Operating Systems
... An interrupt is a signal that informs the processor that a particular device wants its attention. The processor responds to the request, saves the status of the current activity, executes the requested activity and on completion, retrieves the saved activity and resumes the same. Interrupts are of t ...
... An interrupt is a signal that informs the processor that a particular device wants its attention. The processor responds to the request, saves the status of the current activity, executes the requested activity and on completion, retrieves the saved activity and resumes the same. Interrupts are of t ...
Operating Systems I Interfaces to Operating Systems MCT260-Operating Systems I
... • You can capture the entire window but sometimes you may just want to capture (copy) the text that is inside the window • Make sure all text that is desired is visible inside the DOS window • Use the Edit/Mark selection from the program icon menu to mark the text to be captured and then press the E ...
... • You can capture the entire window but sometimes you may just want to capture (copy) the text that is inside the window • Make sure all text that is desired is visible inside the DOS window • Use the Edit/Mark selection from the program icon menu to mark the text to be captured and then press the E ...
Chapter 2.pdf
... • Programming interface to the services provided by the OS – i.e. interface provided to applications • Are called by a running program to get services • Typically written in a high-level language (C or C++) • Machine dependent, but can be invoked by standard procedure libraries • Even a simple progr ...
... • Programming interface to the services provided by the OS – i.e. interface provided to applications • Are called by a running program to get services • Typically written in a high-level language (C or C++) • Machine dependent, but can be invoked by standard procedure libraries • Even a simple progr ...
What is an operating system (OS)?
... 1) CPU Timer - OS sets a timer to expire and interrupt a user pgm before the user pgm is started. Remember that only one program (in a single CPU system) can be executing at a time so when the OS turns control over to a user program it has “lost control.” Modifications to the CPU timer are privilege ...
... 1) CPU Timer - OS sets a timer to expire and interrupt a user pgm before the user pgm is started. Remember that only one program (in a single CPU system) can be executing at a time so when the OS turns control over to a user program it has “lost control.” Modifications to the CPU timer are privilege ...
Unit 2 - NIST NACOL
... announced August 25, 1991. The Linux kernel runs on numerous different platforms including the Intel and Alpha platform and is available under the GNU General Public License. The system can be distributed, used, and expanded free of charge. In this way, developers have access to all the source codes ...
... announced August 25, 1991. The Linux kernel runs on numerous different platforms including the Intel and Alpha platform and is available under the GNU General Public License. The system can be distributed, used, and expanded free of charge. In this way, developers have access to all the source codes ...
Operating Systems
... resource utilization to assure that all available CPU time, memory, and I/0 are used efficiently and that no individual user takes more than her fair share. ...
... resource utilization to assure that all available CPU time, memory, and I/0 are used efficiently and that no individual user takes more than her fair share. ...
COS 318: Operating Systems OS Structures and System Calls Andy Bavier
... Pass by a memory vector (list) Single register for starting address Vector in user’s memory ...
... Pass by a memory vector (list) Single register for starting address Vector in user’s memory ...
Operating Systems Operating System Component and Structure
... – allocate memory space for programs (explicitly and implicitly) – deallocate space when needed by rest of system – maintain mappings from physical to virtual memory ...
... – allocate memory space for programs (explicitly and implicitly) – deallocate space when needed by rest of system – maintain mappings from physical to virtual memory ...
Chapter 1
... pointing device. read-only memory (ROM) Memory that contains information that is not erased when the power is removed from the memory hardware. real-time system An operating system that interacts directly with the user and responds in real time with required information. resource managers Prog ...
... pointing device. read-only memory (ROM) Memory that contains information that is not erased when the power is removed from the memory hardware. real-time system An operating system that interacts directly with the user and responds in real time with required information. resource managers Prog ...
390Lecture1
... • shell: An interactive program that uses user input to manage the execution of other programs. bash : the default shell program on most Linux/Unix systems ...
... • shell: An interactive program that uses user input to manage the execution of other programs. bash : the default shell program on most Linux/Unix systems ...
Unix/Linux: History and Philosophy
... ∗ The memory allocated to a process is private to the process, that is, other programs cannot see the code and data for a given program unless special permission is granted ∗ The files that belong to a certain user may not be visible to other users unless permission is granted · The superuser has pe ...
... ∗ The memory allocated to a process is private to the process, that is, other programs cannot see the code and data for a given program unless special permission is granted ∗ The files that belong to a certain user may not be visible to other users unless permission is granted · The superuser has pe ...
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.