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An operating system ( OS) is system software that manages computer hardware and software resources, and provides common services for computer programs . Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, peripherals, and ...
Kernel (operating system) The kernel is a computer program at the core of a computer 's operating system and generally has complete control over everything in the system. The kernel is also responsible for preventing and mitigating conflicts between different processes. [1] It is the portion of the operating system code that is always resident ...
Installation (computer programs) Installation (or setup) of a computer program (including device drivers and plugins ), is the act of making the program ready for execution. Installation refers to the particular configuration of software or hardware with a view to making it usable with the computer. A soft or digital copy of the piece of ...
The SHARE Operating System (1959) for the IBM 709, IBM 7090, and IBM 7094 computers allowed for an loadable code format called SQUOZE. SQUOZE was a compressed binary form of assembly language code and included a symbol table. Modern IBM mainframe operating systems, such as z/OS, have available a symbol table called Associated data (ADATA).
Microsoft Visio ( / ˈvɪz.i.oʊ / VIZ-ee-oh) (formerly Microsoft Office Visio) is a diagramming and vector graphics application and is part of the Microsoft 365 family. The product was first introduced in 1992 by former American software company Visio Corporation, and its latest version is Visio 2021. Microsoft acquired the assets of Visio ...
A process control block ( PCB ), also sometimes called a process descriptor, is a data structure used by a computer operating system to store all the information about a process . When a process is created (initialized or installed), the operating system creates a corresponding process control block, which specifies and tracks the process state ...
The application software layer interfaces with the operating system, which in turn communicates with the hardware. The arrows indicate information flow. There are two main types of software: Operating systems are "the layer of software that manages a computer's resources for its users and their applications". [23]
C ( pronounced / ˈsiː / – like the letter c) [ 6 ] is a general-purpose programming language. It was created in the 1970s by Dennis Ritchie and remains very widely used and influential. By design, C's features cleanly reflect the capabilities of the targeted CPUs. It has found lasting use in operating systems code (especially in kernels [ 7 ...