Module 4: Processes
... Message system – processes communicate with each other without resorting to shared variables. IPC facility provides two operations: send(message) – message size fixed or variable receive(message) ...
... Message system – processes communicate with each other without resorting to shared variables. IPC facility provides two operations: send(message) – message size fixed or variable receive(message) ...
Xen for UCS
... does not display a graphic bootsplash with a progress bar showing details of the system components starting up. As of UCS 2.2-0 the graphic desktop login screen is no longer started automatically on Xen DomO systems as Vesa X servers cannot currently function correctly on these systems in combinatio ...
... does not display a graphic bootsplash with a progress bar showing details of the system components starting up. As of UCS 2.2-0 the graphic desktop login screen is no longer started automatically on Xen DomO systems as Vesa X servers cannot currently function correctly on these systems in combinatio ...
lecture1423726024
... 1. Mainframe System: It is the system where the first computer used to handle many commercial scientific applications. The growth of mainframe systems traced from simple batch system where the computer runs one and only one application to time shared systems which allowed for user interaction with t ...
... 1. Mainframe System: It is the system where the first computer used to handle many commercial scientific applications. The growth of mainframe systems traced from simple batch system where the computer runs one and only one application to time shared systems which allowed for user interaction with t ...
SELinux For Dummies - LinuxFest Northwest 2015
... This might cause some confusion, but this works the same way as with discretionary access control. The cp command acts a little differently. If a file exists that you are copying over, the new file will maintain the file context of the previous file. If the file does not exist, it will either get th ...
... This might cause some confusion, but this works the same way as with discretionary access control. The cp command acts a little differently. If a file exists that you are copying over, the new file will maintain the file context of the previous file. If the file does not exist, it will either get th ...
Interprocess communication
... Allows two or more processes to share some memory segments With some control over read/write permissions Often used to implement threads packages for UNIX ...
... Allows two or more processes to share some memory segments With some control over read/write permissions Often used to implement threads packages for UNIX ...
![[slides] I/O systems](http://s1.studyres.com/store/data/008422726_1-2cb56c8336d4c09c42da15c554c4a466-300x300.png)
Ans What is operating system
... 1) Round robin scheduling is essentially the preemptive version of ________. 1 FIFO 2 Shortest job first 3 Shortes remaining 4 Longest time first Ans ) 1 2) A page fault occurs 1) when the page is not in the memory 2) when the page is in the memory 3) when the process enters the blocked state 4 when ...
... 1) Round robin scheduling is essentially the preemptive version of ________. 1 FIFO 2 Shortest job first 3 Shortes remaining 4 Longest time first Ans ) 1 2) A page fault occurs 1) when the page is not in the memory 2) when the page is in the memory 3) when the process enters the blocked state 4 when ...
Chapter 13: I/O Systems
... OS can recover from disk read, device unavailable, transient write failures Most return an error number or code when I/O request fails System error logs hold problem reports ...
... OS can recover from disk read, device unavailable, transient write failures Most return an error number or code when I/O request fails System error logs hold problem reports ...
Processes
... Message system – processes communicate with each other without resorting to shared variables. IPC facility provides two operations: send(message) – message size fixed or variable receive(message) ...
... Message system – processes communicate with each other without resorting to shared variables. IPC facility provides two operations: send(message) – message size fixed or variable receive(message) ...
OperatingSystemDesign_SP16_Ch_1_4
... System Calls (i.e. File Operations). System programs to manipulate files and directories (i.e. mkdir, cp, rm, ls). System programs for development (i.e. compilers, assemblers, loaders). Communications between processes or other computer systems ( i.e. sockets, network protocols ). Applicatio ...
... System Calls (i.e. File Operations). System programs to manipulate files and directories (i.e. mkdir, cp, rm, ls). System programs for development (i.e. compilers, assemblers, loaders). Communications between processes or other computer systems ( i.e. sockets, network protocols ). Applicatio ...
A user-mode port of the Linux kernel
... by the tracing thread. It needs to ptrace all new processes, and that is simpli ed if it's their parent. The new thread starts life in a trampoline which does some initialization. It sets up its signal handlers for SIGSEGV, SIGIO, and SIGVTALRM, initializes the timer, and sets itself to be ptraced b ...
... by the tracing thread. It needs to ptrace all new processes, and that is simpli ed if it's their parent. The new thread starts life in a trampoline which does some initialization. It sets up its signal handlers for SIGSEGV, SIGIO, and SIGVTALRM, initializes the timer, and sets itself to be ptraced b ...
Higher National Unit specification: general information Unit title
... Given the theoretical nature of this Unit, it is intended that a significant amount of time will be made available as a central part of the course for revision, tutorials and formative assessment exercises. Candidates should be strongly encouraged to undertake further reading, and opportunities for ...
... Given the theoretical nature of this Unit, it is intended that a significant amount of time will be made available as a central part of the course for revision, tutorials and formative assessment exercises. Candidates should be strongly encouraged to undertake further reading, and opportunities for ...
ppt - Computer and Information Science
... Ontogeny Recapitulates Phylogeny • Each new “species” of computer – Goes through same development as “ancestors” ...
... Ontogeny Recapitulates Phylogeny • Each new “species” of computer – Goes through same development as “ancestors” ...
UNIX
... architectures (Intel, Motorola, Alpha, SPARC, PowerPC, ARM) and is developed entirely by volunteers over the Internet ...
... architectures (Intel, Motorola, Alpha, SPARC, PowerPC, ARM) and is developed entirely by volunteers over the Internet ...
Introduction to Linux Winelfred G. Pasamba Dec 9, 2005 Finster Hall
... RedHat – one of the first most successful ...
... RedHat – one of the first most successful ...
File Systems
... 2. Get inode of device special file; extract major and minor nos. of device being unmounted; release inode of special file. 3. Get mount table entry, based on major/minor #. 4. Check whether files on the f.s. are still in use: 4.1 search inode table for all files whose dev. # matches the f.s. to be ...
... 2. Get inode of device special file; extract major and minor nos. of device being unmounted; release inode of special file. 3. Get mount table entry, based on major/minor #. 4. Check whether files on the f.s. are still in use: 4.1 search inode table for all files whose dev. # matches the f.s. to be ...
The Case for VOS: The Vector Operating System Abstract Carnegie Mellon University,
... returns exactly one connection from a list of pending connections. The application then performs a series of sequential operations to handle the connection—setup, application-specific processing, and teardown. A highload webserver may be serving many requests in parallel, but each request follows si ...
... returns exactly one connection from a list of pending connections. The application then performs a series of sequential operations to handle the connection—setup, application-specific processing, and teardown. A highload webserver may be serving many requests in parallel, but each request follows si ...
Module 4: Processes
... If P and Q wish to communicate, they need to: establish a communication link between them exchange messages via send/receive Implementation of communication link physical (e.g., shared memory, hardware bus) logical (e.g., logical properties) ...
... If P and Q wish to communicate, they need to: establish a communication link between them exchange messages via send/receive Implementation of communication link physical (e.g., shared memory, hardware bus) logical (e.g., logical properties) ...
OSPP: The Kernel Abstraction
... • Request by program for kernel to do some operation on its behalf • Only limited # of very carefully coded entry points ...
... • Request by program for kernel to do some operation on its behalf • Only limited # of very carefully coded entry points ...
Plan 9 from Bell Labs
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Plan 9 from Bell Labs is a distributed operating system, originally developed by the Computing Sciences Research Center at Bell Labs between the mid-1980s and 2002. It takes some of the principles of Unix, developed in the same research group, but extends these to a networked environment with graphics terminals.In Plan 9, virtually all computing resources, including files, network connections, and peripheral devices, are represented through the file system rather than specialized interfaces. A unified network protocol called 9P ties a network of computers running Plan 9 together, allowing them to share all resources so represented.The name Plan 9 from Bell Labs is a reference to the Ed Wood 1959 cult science fiction Z-movie Plan 9 from Outer Space. Also, Glenda, the Plan 9 Bunny, is presumably a reference to Wood's film Glen or Glenda. The system continues to be used and developed by operating system researchers and hobbyists.