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Software that manages computer hardware resources
of operating systems DBOS Interruptible operating system List of operating systems List of pioneers in computer science Glossary of operating systems terms
Operating_system
An interruptible operating system is an operating system with ability to handle multiple interrupts concurrently, or in other words, which allow interrupts
Interruptible operating system
Interruptible_operating_system
Computer software for running local area networks
operating system developed by Microsoft VyOS, an open source fork of the Vyatta routing package Distributed operating system FRRouting Interruptible operating
Network_operating_system
Computer operating system for applications with critical timing constraints
list) Earliest deadline first scheduling Embedded operating system Firmware Interruptible operating system Least slack time scheduling Rate-monotonic scheduling
Real-time_operating_system
Experimental operating system from Microsoft Research
Singularity is an experimental operating system developed by Microsoft Research between July 9, 2003, and February 7, 2015. It was designed as a high dependability
Singularity (operating system)
Singularity_(operating_system)
Operating system by Apple
Copland is an operating system developed by Apple for Macintosh computers between 1994 and 1996 but never commercially released. It was intended to be
Copland_(operating_system)
Signal to a computer processor emitted by hardware or software
the hardware does not generate the expected interrupt for a change in state, causing the operating system to wait indefinitely. Depending on the details
Interrupt
Discontinued modular real-time multiuser multitasking operating system
FlexOS is a discontinued modular real-time multiuser multitasking operating system (RTOS) designed for computer-integrated manufacturing, laboratory, retail
FlexOS
Family of IBM operating systems
family of virtual machine operating systems used on IBM mainframes including the System/370, System/390, IBM Z and compatible systems. It replaced the older
VM_(operating_system)
Core of a computer operating system
program at the core of a computer's operating system that always has complete control over everything in the system. The kernel is also responsible for
Kernel_(operating_system)
Operating system designed to operate on multiple systems over a network computer
A distributed operating system is system software over a collection of independent software, networked, communicating, and physically separate computational
Distributed_operating_system
Real-time operating system
Real-time Multitasking eXecutive (iRMX) is a real-time operating system designed for use with the Intel 8080 and 8086 family of processors. Intel developed
RMX_(operating_system)
Series of operating systems
GEORGE was the name given to a series of operating systems released by International Computers and Tabulators (ICT) in the 1960s, for the ICT 1900 series
GEORGE_(operating_system)
Computer systems programming special block code
In computer systems programming, an interrupt handler, also known as an interrupt service routine (ISR), is a special block of code associated with a
Interrupt_handler
effective interrupt latency. These include features like: Minimum jitter through non-interruptible instructions Zero wait states for the memory system Switchable
Interrupt_latency
1960s timesharing system for IBM mainframes
Time Sharing System TSS/360 is a discontinued early time-sharing operating system designed exclusively for a special model of the System/360 line of mainframes
TSS_(operating_system)
Real-time operating system
Rodos (Realtime Onboard Dependable Operating System) is a real-time operating system for embedded systems and was designed for application domains demanding
Rodos_(operating_system)
Family of operating systems for IBM PC compatibles
DOS (/dɒs/, /dɔːs/) is a family of disk-based operating systems for IBM PC compatible computers. It primarily consists of IBM PC DOS and a rebranded version
DOS
technical description. Comparison of operating systems Hypervisor Interruptible operating system List of operating systems List of pioneers in computer science
Comparison of user features of operating systems
Comparison_of_user_features_of_operating_systems
OS hardware Bugs
In operating systems, an interrupt storm is an event during which a processor receives an inordinate number of interrupts that consume the majority of
Interrupt_storm
Operating mode of x86 central processor units
System Management Mode (SMM, sometimes called ring −2 in reference to protection rings) is an operating mode of x86 central processor units (CPUs) in
System_Management_Mode
Method by which work is assigned
executive Dynamic priority scheduling Foreground-background Interruptible operating system Least slack time scheduling Lottery scheduling Priority inversion
Scheduling_(computing)
Computer operating system
just VMS, is a multi-user, multiprocessing and virtual memory-based operating system. It is designed to support time-sharing, batch processing, transaction
OpenVMS
Programming language construct for special conditions
defined by different layers of a computer system, and the typical layers are CPU-defined interrupts, operating system (OS)-defined signals, and programming
Exception_handling
Research operating system from Microsoft Research
Verve is a research operating system developed by Microsoft Research. Verve is verified end-to-end for type safety and memory safety. Because of their
Verve_(operating_system)
Real-time operating system by IntervalZero
real-time operating systems (RTOS) by the firm IntervalZero. They are software extensions that convert Microsoft Windows operating system into a RTOS
RTX_(operating_system)
Apple IIGS operating system
is an operating system developed by Apple Computer for its Apple IIGS personal computer. It provides facilities for accessing the file system, controlling
Apple_GS/OS
Real-time operating system
Micro-Controller Operating Systems (MicroC/OS, stylized as μC/OS, or Micrium OS) is a real-time operating system (RTOS) designed by Jean J. Labrosse in
Micro-Controller Operating Systems
Micro-Controller_Operating_Systems
particular operating systems. The following tables compare general and technical information for a number of widely used and currently available operating system
Comparison of operating system kernels
Comparison_of_operating_system_kernels
Firmware for hardware initialization and OS runtime services
interface to application programs and the operating system. More recent operating systems do not use the BIOS interrupt calls after startup. Most BIOS implementations
BIOS
Hardware signal sent to a processor to interrupt a running program and handle input
the system relies on interrupt requests. There are default settings that are configured in the system BIOS and recognized by the operating system. These
Interrupt_request
Operative System
Heuristic Operating System, or Nachos, is instructional software for teaching undergraduate, and potentially graduate level operating systems courses.
Not Another Completely Heuristic Operating System
Not_Another_Completely_Heuristic_Operating_System
Low level firmware interface to the hardware
BIOS implementations provide interrupts that can be invoked by operating systems and application programs to use the facilities of the firmware on IBM
BIOS_interrupt_call
Flag bit in the CPU relating to interrupts
CLI is used in operating systems to disable interrupts so kernel code (typically a driver) can avoid race conditions within an interrupt handler. This
Interrupt_flag
Fault initiated by x86 processors due to an access violation
violation, it stops executing the code and sends a GPF interrupt. In most cases, the operating system removes the failing process from the execution queue
General_protection_fault
Computer system call
the sleeping thread will run again. On POSIX systems, the nanosleep and related syscalls are interruptible by signals, returning the remaining sleep time
Sleep_(system_call)
Real-time operating system
The REX Operating System (Real-time Executive Operating System) is a real-time operating system (RTOS) developed by Qualcomm for the ARM processor based
REX_OS
Video game character from the Portal series
GLaDOS (Genetic Lifeform and Disk Operating System) is a fictional character in the video game series Portal, created by Erik Wolpaw and Kim Swift, and
GLaDOS
Operating system
Galileo was an unreleased 32-bit operating system that was under development by Acorn Computers as a long-term project to produce "an ultra-modern scalable
Galileo_(operating_system)
Linux distribution
using Nix's functional programming language or one of Nix's forks. The operating system builds itself according to declarations written by the user within
NixOS
Unix variant with real-time operating system capabilities
MERT operating system was a four-layer design, in decreasing order of protection: Kernel: resource allocation of memory, CPU time and interrupts Kernel-mode
Multi-Environment_Real-Time
Operating system for IBM S/360 and later mainframes
known as IBM System/360 Operating System, is a discontinued batch processing operating system developed by IBM for their then-new System/360 mainframe
OS/360_and_successors
Software organization of the Michigan Terminal System
MTS System Architecture describes the software organization of the Michigan Terminal System, a time-sharing computer operating system in use from 1967
MTS_system_architecture
Comprehensive list of features of x86-based computers
development community for peer-review and to assist in operating system development. BIOS interrupt call DOS API INT (x86 instruction) Malware analysis Contents
Ralf_Brown's_Interrupt_List
Way for programs to access kernel services
In computing, a system call (syscall) is the programmatic way in which a computer program requests a service from the operating system on which it is executed
System_call
Real-time operating system
Unix-like real-time operating system from Lynx Software Technologies (formerly "LynuxWorks"). Sometimes known as the Lynx Operating System, LynxOS features
LynxOS
MSDOS-like operating system
DR-DOS is a disk operating system for IBM PC compatibles, originally developed by Gary A. Kildall's Digital Research and derived from Concurrent PC DOS
DR-DOS
Computer interrupt in home computers triggered by video output
line. Modern protected mode operating systems generally do not support raster interrupts as access to hardware interrupts for unprivileged user programs
Raster_interrupt
Sharing of data between running processes in a computer system
processes in a computer system, or between multiple such systems. Mechanisms for IPC may be provided by an operating system. Applications which use IPC
Inter-process_communication
Windows NT kernel image
ntoskrnl.exe (short for "Windows NT operating system kernel executable"), also known as the kernel image, is an executable file that contains the kernel
Ntoskrnl.exe
Modern reimplementation of Sixth Edition Unix
and RISC-V systems. It was created for educational purposes in MIT's Operating System Engineering course in 2006. MIT's Operating System Engineering
Xv6
Temporarily interrupting a computer task
(simultaneously). The operating system which controls such a design is called a multi-tasking system. Today, nearly all operating systems support preemptive
Preemption_(computing)
1976 book by John Lions
A Commentary on the Sixth Edition UNIX Operating System by John Lions (later reissued as Lions' Commentary on UNIX 6th Edition and commonly referred to
A Commentary on the UNIX Operating System
A_Commentary_on_the_UNIX_Operating_System
Form of inter-process communication in computer systems
is sent, the operating system interrupts the target process's normal flow of execution to deliver the signal. Execution can be interrupted during any non-atomic
Signal_(IPC)
Set of detailed instructions to assist in workplace safety
(documented as standard operating procedures) used in any manufacturing process that could affect the quality of the product. Standard Operating Procedures are
Standard_operating_procedure
multiprocessor system or on a CPU with multiple cores, real-time tasks can run on one CPU or core while non-real-time tasks run on another. The operating system must
CPU_shielding
Concurrent execution of multiple processes
than there are CPUs. Multitasking is a common feature of computer operating systems since at least the 1960s. It allows more efficient use of the computer
Computer_multitasking
Data structure in microprocessors
Software interrupt vector numbers are defined by the specific runtime environment, such as the IBM PC BIOS, DOS, or other operating systems. They are
Interrupt_descriptor_table
Call by which a computer process terminates its execution
On many computer operating systems, a computer process terminates its execution by making an exit system call. More generally, an exit in a multithreading
Exit_(system_call)
First Microsoft employee
developed an 8-bit operating system called M-DOS or MIDAS; the system itself was never released by Microsoft, but its file system (a variant of FAT) influenced
Marc_McDonald
API of the MS-DOS operating system
MS-DOS/PC DOS and other DOS-compatible operating systems. Most calls to the DOS API are invoked using software interrupt 21h (INT 21h). By calling INT 21h
DOS_API
First implementation of paged virtual memory
The THE multiprogramming system (THE OS) was a computer operating system designed by a team led by Edsger W. Dijkstra, described in monographs in 1965-66
THE_multiprogramming_system
Probability of a normal operation of the electrical grid at a given time
automatically ramping up generation and shedding the interruptible loads. Security relies on the operating reserve. Historically, the ancillary services (e
Power_system_reliability
Implementation of a TT system will typically involve use of a single interrupt that is linked to the periodic overflow of a timer. This interrupt may drive a task
Time-triggered_architecture
Family of CP/M- and DOS-compatible multi-user multi-tasking operating systems
operating system for IBM PC-compatible microcomputers. An evolution of the older Concurrent CP/M-86, Concurrent DOS and Concurrent DOS 386 operating systems
Multiuser_DOS
Mainframe operating system by ICL
VME (Virtual Machine Environment) is a mainframe computer operating system developed by the UK company International Computers Limited (ICL, now part of
ICL_VME
task to be interrupted, and later continued from the same point. The concept of context assumes significance in the case of interruptible tasks, wherein
Context_(computing)
Operating system
Conversational Monitor System (CMS, originally Cambridge Monitor System) is a simple interactive single-user operating system. CMS was originally developed
Conversational_Monitor_System
is an acronym of InterLink Internet Operating System. It is an attempt to create a router-only operating system; one specifically oriented towards computer
ILIOS
Real-time operating system
RTLinux is a hard real-time operating system (RTOS) microkernel that runs the entire Linux operating system as a fully preemptive process. The hard real-time
RTLinux
Operating system for Apple computers
operating system, derived from OPENSTEP for Mach and FreeBSD, which has been marketed and developed by Apple since 2001. It is the current operating system
MacOS
Open source software library
DBOS (Formerly Database-Oriented Operating System, now just DBOS) is an open source durable workflow execution software library written for the Python
DBOS
Switch between processes or tasks on a computer
state of the running process. However, in a multitasking operating system, the operating system switches between processes or threads to allow the execution
Context_switch
Operating system
quasi-atomic, safely-interruptible system calls. No process could ever observe any process (including itself) in the middle of executing any system call. In support
Incompatible Timesharing System
Incompatible_Timesharing_System
Real-time operating system (RTOS) software
/ˈkjuːnɪks/) is a commercial Unix-like real-time operating system, aimed primarily at the embedded systems market. The product was originally developed in
QNX
Mainframe computer operating system
Program) is the operating system of the Burroughs B5000/B5500/B5700 and the B6500 and successors, including the Unisys Clearpath/MCP systems. MCP was originally
Burroughs_MCP
Computer memory management methodology
some operating systems, e.g. Burroughs/Unisys MCP, and OS/360 and successors, memory is managed by the operating system. In other operating systems, e.g
Memory_management
BIOS interrupt call
for BIOS interrupt call 10hex, the 17th interrupt vector in an x86-based computer system. The BIOS typically sets up a real mode interrupt handler at
INT_10H
Model independent architecture for the S/360 line of mainframe computers
operating program. The 64-bit PSW describes (among other things) the address of the current instruction being executed, condition code and interrupt masks
IBM_System/360_architecture
Ways in which keystrokes are interpreted
Windows calculator in Standard mode and those included with most early operating systems, each binary operation is executed as soon as the next operator is
Calculator_input_methods
Security-focused, Android-based mobile operating system
GrapheneOS (/ˈɡræfiːn.oʊˈɛs/) is an open-source mobile operating system focused on security and privacy, available for Google Pixel and future Motorola
GrapheneOS
Electrical safety device used in household wiring
a force to break a stuck switch free, thus failing to operate the safety device. By operating the test button regularly it can be seen whether or not
Residual-current_device
Distributed operating system
distributed operating system developed by Huawei that succeeded the similarly named HarmonyOS, with the main difference being that the "NEXT" operating system supports
HarmonyOS_5
Type of computer hardware interrupt
traditional interrupt mechanisms, such as the legacy interrupt request (IRQ) system. Message signaled interrupts are supported in PCI bus since its version 2
Message_Signaled_Interrupts
Family of network operating systems by Cisco
The Internetworking Operating System (IOS) is a family of proprietary network operating systems used on several router and network switch models manufactured
Cisco_IOS
A track circuit interrupter may be fitted at catch points, trap points or buffer stops to maintain a track circuit in the 'occupied' state in the event
Track_circuit_interrupter
Measurement of time
increasingly common standard in the Jargon File. Stratus VOS (Virtual Operating System) uses a jiffy of 1/65,536 second to express date and time (number of
Jiffy_(time)
Computer system with a dedicated function
assembly code or a mixture of both. Real-time operating systems often support tracing of operating system events. A graphical view is presented by a host
Embedded_system
Representation of time used in computers
0x1A, AH=0x04". Ralf Brown's Interrupt List. "CP/M Plus (CP/M Version 3.0) Operating System Guide" (PDF). "BDOS system calls". Ralf D. Brown (2000).
System_time
Piece of software or hardware that creates and runs virtual machines
hypervisor presents the guest operating systems with a virtual operating platform and manages the execution of the guest operating systems. Unlike an emulator,
Hypervisor
Real-time operating system
high-performance, deterministic real-time operating system (RTOS) for resource-constrained embedded systems. It is implemented in C++ with a clean object-oriented
SuperTinyKernel_RTOS
Operating system
x86 hardware and the Secure Trusted Operating Program (STOP) operating system. XTS-400 was developed by BAE Systems Inc., and originally released as version
XTS-400
Type of interrupt signal sent between computer processors
for some IBM operating systems refers to this as a shoulder tap. On IBM PC compatible computers that use the Advanced Programmable Interrupt Controller
Inter-processor_interrupt
Computer filing system
computing, a file system or filesystem (FS or fs) governs file organization and access. A local file system is a capability of an operating system that services
File_system
Microsoft computer operating system
em-ess-DOSS; acronym for Microsoft Disk Operating System, also known as Microsoft DOS) is an operating system for x86-based personal computers mostly
MS-DOS
GEC operating system introduced in 1977
OS4000 is a proprietary operating system introduced by GEC Computers Limited in 1977 as the successor to GEC DOS, for its range of GEC 4000 series 16-bit
OS4000
Historical account
The history of IBM mainframe operating systems is significant within the history of mainframe operating systems, because of IBM's long-standing position
History of IBM mainframe operating systems
History_of_IBM_mainframe_operating_systems
Type of operating system kernel
A tickless kernel is an operating system kernel in which timer interrupts do not occur at regular intervals, but are only delivered as required. The Linux
Tickless_kernel
Real-time operating system
FreeRTOS is a real-time operating system kernel for embedded devices that has been ported to 40 microcontroller platforms. It is distributed under the
FreeRTOS
Early commercial UNIX operating system
UNIX System V (pronounced: "System Five") is one of the first commercial versions of the Unix operating system. It was originally developed by AT&T and
UNIX_System_V
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