ACCTG 1 Lecture Notes - Lecture 6: Atlas Supervisor, Computer Hardware, Process State
Document Summary
Operating system: os is a low-level software program which manages a computers software and hardware, os is the interface between the user application and computer hardware. Why do we need os: without an os a computer is useless to the majority of users, you would end up programming your own os to complete any task. Os objectives: to make the computer system convenient and easy to use, to utilize computer hardware resources, to execute user programs and simplify the process. Main functions: managing resources, cpu, memory, secondary memory, peripherals, establishing user interface, executing and providing services to software, security and protection. Nat: program, a program is passive entity, an operating system executes programs in a variety of ways, batch mode: Submitted to a queue and executed: real-time mode: Can run in foreground or background: server mode: Waits in background until another process requires their services.
