1.1. The UNIX Operating System
... an OS ensures safe access to a printer by allowing only one application program to send data directly to the printer at any one time. An OS encourages efficient use of the CPU by suspending programs that are waiting for I/O operations to complete to make way for programs that can use the CPU more pr ...
... an OS ensures safe access to a printer by allowing only one application program to send data directly to the printer at any one time. An OS encourages efficient use of the CPU by suspending programs that are waiting for I/O operations to complete to make way for programs that can use the CPU more pr ...
Nechiele Whittington - Optimal Resume at KAPLAN UNIVERSITY
... because of UNICS that a programmer named Ken Thompson over at Bell Labs ultimately created the first version of UNIX which was based off of the C programming language. From that point on, the world of computers would never be the same (FreeDictionary.com UNIX). UNIX was the launch pad for operating ...
... because of UNICS that a programmer named Ken Thompson over at Bell Labs ultimately created the first version of UNIX which was based off of the C programming language. From that point on, the world of computers would never be the same (FreeDictionary.com UNIX). UNIX was the launch pad for operating ...
here
... 6. Analyse the architecture of a computer system and understand the significance of different architectural features and their affect on system administration. 7. Perform basic and common system administration operations 8. Develop further appreciation of the protocols and policies of system ...
... 6. Analyse the architecture of a computer system and understand the significance of different architectural features and their affect on system administration. 7. Perform basic and common system administration operations 8. Develop further appreciation of the protocols and policies of system ...
Introduction
... • Stack is used for function calls. • Heap is used for dynamically needed memory • Data is for memory that is “static”, like global variables, etc. • Text (code) is program machine code. • How about threads? • Is it all writable? Executable? Readable? ...
... • Stack is used for function calls. • Heap is used for dynamically needed memory • Data is for memory that is “static”, like global variables, etc. • Text (code) is program machine code. • How about threads? • Is it all writable? Executable? Readable? ...
Chapter I Introduction
... The CPU does not waste any time waiting for the completion of I/Os • From time to time, the OS will need to regain control of the CPU – Because a task has exhausted its fair share of the CPU time – Because something else needs to be done. ...
... The CPU does not waste any time waiting for the completion of I/Os • From time to time, the OS will need to regain control of the CPU – Because a task has exhausted its fair share of the CPU time – Because something else needs to be done. ...
Chapter I Introduction
... The CPU does not waste any time waiting for the completion of I/Os • From time to time, the OS will need to regain control of the CPU – Because a task has exhausted its fair share of the CPU time – Because something else needs to be done. ...
... The CPU does not waste any time waiting for the completion of I/Os • From time to time, the OS will need to regain control of the CPU – Because a task has exhausted its fair share of the CPU time – Because something else needs to be done. ...
History of Operating Systems
... syntax error! Programmers saw this as cumbersome. However, system utilization increased dramatically. • No programmer set up or “thinking” time. • As one job terminated, the computer would load the next job in the batch and begin execution. Since programmers were separated from the machine, job cont ...
... syntax error! Programmers saw this as cumbersome. However, system utilization increased dramatically. • No programmer set up or “thinking” time. • As one job terminated, the computer would load the next job in the batch and begin execution. Since programmers were separated from the machine, job cont ...
Operating systems. History. Function. Organization. Software
... • When the total required memory space exceeds the physical available space. – May create the illusion that the machine has more memory than it actually does (virtual memory) by playing a “shell game” in which blocks of data (pages) are shifted back and forth between main memory and ...
... • When the total required memory space exceeds the physical available space. – May create the illusion that the machine has more memory than it actually does (virtual memory) by playing a “shell game” in which blocks of data (pages) are shifted back and forth between main memory and ...
Document
... • When the total required memory space exceeds the physical available space. – May create the illusion that the machine has more memory than it actually does (virtual memory) by playing a “shell game” in which blocks of data (pages) are shifted back and forth between main memory and ...
... • When the total required memory space exceeds the physical available space. – May create the illusion that the machine has more memory than it actually does (virtual memory) by playing a “shell game” in which blocks of data (pages) are shifted back and forth between main memory and ...
different people attempt to accomplish the
... Nick Stoughton reports on his work on several standards committees, work that has real impact upon both programming and open source. If you care about these issues, you need to read Nick’s report. ...
... Nick Stoughton reports on his work on several standards committees, work that has real impact upon both programming and open source. If you care about these issues, you need to read Nick’s report. ...
Operating Systems
... Each device driver is uniquely designed for its particular type of device and translate the generic requests to more technical steps required by the device ...
... Each device driver is uniquely designed for its particular type of device and translate the generic requests to more technical steps required by the device ...
What is an operating system?
... -It is an executable file loaded into memory when the computer is booting and it is called unix (System V) or vmunix (BSD) or … linux ! -After loading in memory, the kernel has the following main functions: -Managing devices, memory, processes -Controlling the information transmission between system ...
... -It is an executable file loaded into memory when the computer is booting and it is called unix (System V) or vmunix (BSD) or … linux ! -After loading in memory, the kernel has the following main functions: -Managing devices, memory, processes -Controlling the information transmission between system ...
Core System Services
... processes, such as telnet, ftp, tftp, etc. • So instead of constantly maintaining potentially dozens of services loaded in memory waiting to be used, they are all listed in inetd’s configuration file, /etc/inetd.conf. On their behalf, inetd listens for incoming connections. Thus, only a single proce ...
... processes, such as telnet, ftp, tftp, etc. • So instead of constantly maintaining potentially dozens of services loaded in memory waiting to be used, they are all listed in inetd’s configuration file, /etc/inetd.conf. On their behalf, inetd listens for incoming connections. Thus, only a single proce ...
OPERATING SYSTEMS: DESIGN AND IMPLEMENTATION
... Create a new entry, name2, pointing to name1 Remove a directory entry Mount a file system Unmount a file system Flush all cached blocks to the disk Change the working directory Change the root directory ...
... Create a new entry, name2, pointing to name1 Remove a directory entry Mount a file system Unmount a file system Flush all cached blocks to the disk Change the working directory Change the root directory ...
ppt
... – Defined as ability to write source code so that it can run on two or more types of machines – Requires use of a different compiler/loader and library for each type of machine ...
... – Defined as ability to write source code so that it can run on two or more types of machines – Requires use of a different compiler/loader and library for each type of machine ...
System Call Implementation - Computer and Information Science
... _PROTOTYPE ( return type do_XXXX, (arguments if any) ...
... _PROTOTYPE ( return type do_XXXX, (arguments if any) ...
Operating System Concept
... ◦ 2. A user-defined signal handler User-defined function is called to handle the signal rather than the default action. ...
... ◦ 2. A user-defined signal handler User-defined function is called to handle the signal rather than the default action. ...
pdf
... Unix focuses on a very simple process + I/O model Mach focused on a very basic / general VM model, then uses it to support Unix, Windows, and “native” services If Mach mostly is a VM infrastructure, was this the best way to do that? If Linux needed to extend Unix, was Unix simplicity as much of a wi ...
... Unix focuses on a very simple process + I/O model Mach focused on a very basic / general VM model, then uses it to support Unix, Windows, and “native” services If Mach mostly is a VM infrastructure, was this the best way to do that? If Linux needed to extend Unix, was Unix simplicity as much of a wi ...
Introduction To Operating Systems
... • I/O devices are much slower than CPU • Synchronous (polling) After I/O starts, busy polling the device status register until it shows the operation completes. • Asynchronous (interrupt-driven) After I/O starts, control returns to user program without waiting for I/O completion. Device controller l ...
... • I/O devices are much slower than CPU • Synchronous (polling) After I/O starts, busy polling the device status register until it shows the operation completes. • Asynchronous (interrupt-driven) After I/O starts, control returns to user program without waiting for I/O completion. Device controller l ...
CS 377: Operating Systems Outline
... • Linux Kernel - all code that is needed as soon as the system begins: CPU scheduler, memory managers, system call / interrupt support, etc • A monolithic kernel - benefits? • Kernel modules - extensions to the kernel that can be dynamically loaded or unloaded as needed: device drivers, file systems ...
... • Linux Kernel - all code that is needed as soon as the system begins: CPU scheduler, memory managers, system call / interrupt support, etc • A monolithic kernel - benefits? • Kernel modules - extensions to the kernel that can be dynamically loaded or unloaded as needed: device drivers, file systems ...
CMPT 880: Internet Architectures and Protocols
... OS needs to be constantly aware of possible errors May occur in CPU and memory hardware, in I/O devices, in user program For each type of error, OS should take the appropriate action to ensure correct and consistent computing Debugging facilities can greatly enhance the user’s and programmer ...
... OS needs to be constantly aware of possible errors May occur in CPU and memory hardware, in I/O devices, in user program For each type of error, OS should take the appropriate action to ensure correct and consistent computing Debugging facilities can greatly enhance the user’s and programmer ...
Slide 1
... File System: Inode List • Inodes are used to access disk files. • Inodes maps the disk files • For each file there is an inode entry in the inode list block • Inode list also keeps track of directory structure ...
... File System: Inode List • Inodes are used to access disk files. • Inodes maps the disk files • For each file there is an inode entry in the inode list block • Inode list also keeps track of directory structure ...
