COMPSCI 1JC3 Lecture Notes - Lecture 10: Declarative Programming, High-Level Programming Language, Multiprocessing
7 Dec 2017
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Document Summary
An app is a self-contained software program that performs a specific task. Program - complete set of instructions in a language to perform tasks. When it is installed, the computer becomes a machine that operates as specified by the program. An app depends heavily on its operating environment, which is usually provided solely by the operating system. Device drivers - allow for control of peripheral devices. When obtaining a new app, you should get the one designated for your operating system. Software can be easily configured, fine-tuned and customized to work in different environments. A program in execution is called a process. Many can run concurrently, or in parallel when a computer has multiple cpus. A process interacts with users through gui or cli. Processes can interact with other processes through interprocess communication. Child process is a program that is accessed by another program. Pipe - a memory area where one processes stores data and another process receives data.
