Operating system technology

software that emulates an entire computer, often used to provide a different operating system or hardware architecture than the host system

open-source software for deploying and running of containerized applications

collection of non-volatile resources used by computer programs, often for software development

particular execution of a computer program

problem affecting digital systems that store system time as a signed 32-bit integer

concurrent execution of multiple processes over a certain period of time

computer input/output device; an electronic or electromechanical hardware device that is used for entering data into, and displaying data from, a computer or a computing system update programming

in computer science, the mechanism used by an application program to request service from the operating system or another application program

thumb|Preferred badge for promoting apps on Flathub since 2023, English version Flatpak is a utility for software deployment and package management for Linux. It provides a sandbox environment in which users can run application software in (partial) isolation from the rest of the system. Flatpak was known as xdg-app until 2016.

thumb|upright=2|A QWERTY keyboard layout with the position of Control, Alt and Delete keys highlighted Control-Alt-Delete (often abbreviated to Ctrl+Alt+Del and sometimes called the "three-finger salute" or "Security Keys") is a computer keyboard command on IBM PC compatible computers, invoked by pressing the Delete key while holding the Control and Alt keys: . The function of the key combination differs depending on the context but it generally interrupts or facilitates interrupting a function. For instance, in pre-boot environment (before an operating system starts) or in MS-DOS, Windows 3.0

In computing, time-sharing is the concurrent sharing of a computing resource among many tasks or users by giving each task or user a small slice of processing time. This quick switch between tasks or users gives the illusion of simultaneous execution. It enables multi-tasking by a single user or enables multiple-user sessions.

software that allows access by multiple users of a computer

form of computing in which several computations logically execute during overlapping time periods

suspend mode for electronic devices which maintains state in volatile memory

binary interface between compiled program units

dynamic value that affects the behavior of processes on a computer

software deployment and package management system developed by Canonical

software run under a kernel

computer suspend mode that dumps main memory to persistent storage and fully powers down

layer of protection in computer systems

set of software routines that emulate platform-specific details, giving programs direct access to hardware resources in a device-independent, high performance manner

act of temporarily interrupting a task being carried out by a computer system, without requiring its cooperation, and with the intention of resuming the task at a later time

thumb|Magnetic recording tape wound onto a spool may have contributed to the origin of the term

computer system's notion of the passing of time

procedure to turn off the computer

computer program or subroutine to process a stream into another stream

hardware direct memory access over computer networks

process of preparing and equipping a network

computer system for maintaining order among running programs

container system

computer error on the Intel x86 architecture

machine instruction code that executes properly regardless of where in memory it resides

sysctl is a software mechanism in some Unix-like operating systems that reads and modifies the attributes of the system kernel such as its version number, maximum limits, and security settings. It is available both as a system call for compiled programs, and an administrator command for interactive use and scripting. Linux additionally exposes sysctl as a virtual file system.

measurement of time

amount of computational work performed

software library in compiled form, intended for dynamic linking

In computer science, read-copy-update (RCU) is a synchronization mechanism that avoids the use of lock primitives while multiple threads concurrently read and update elements that are linked through pointers and that belong to shared data structures (e.g., linked lists, trees, hash tables).

feature of multi-user operating systems

Bit used by the CPU cache

computer crash reporter

computer data variable

mechanism by which a computer program can, at run time, load a library into memory, retrieve the addresses of functions and variables contained in the library, execute those functions or access those variables, and unload the library from memory

software operation that activates a display mode for a computer's display controller

data structure storing the entire state of a computer

ALTQ (ALTernate Queueing) is the network scheduler for Berkeley Software Distribution. ALTQ provides queueing disciplines, and other components related to quality of service (QoS), required to realize resource sharing. It is most commonly implemented on BSD-based routers. ALTQ is included in the base distribution of FreeBSD, NetBSD, and DragonFly BSD, and was integrated into the pf packet filter of OpenBSD but later replaced by a new queueing subsystem (it was deprecated with OpenBSD 5.5 release, and completely removed with 5.6 in 2014).

collection of data in memory that a process is expected to actually touch in some workload

Apptainer (formerly Singularity) is a free and open-source computer program that performs operating system-level virtualization also known as containerization.