What is an operating system? What does it do? What are operating system control objectives?
An operating system is a computer's control program. It controls user sharing of applications and resources such as processors, memory, databases, and peripherals such as printers. Common PC operating systems include Windows 2000, Windows NT, and Linux.
An operating system carries out three primary functions: translating high level languages into machine language using modules called compilers and interpreters; allocating computer resources to users, workgroups, and applications; and managing job scheduling and multiprogramming.
Operating systems have five basic control objectives:
1 . to protect itself from users,
2 . to protect users from each other,
3 . to protect users from themselves,
4 . to protect it from itself, and
5 . to protect itself from its environment.
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