CSE111: Great Ideas in Computer Science Dr. Carl Alphonce 219 Bell Hall Office hours: M-F 11:00-11:

cell phones off (please) 2

Announcements Exam 1 handback Exam 1 solution is posted Reminder: HW2 due on Friday 3

Today’s Agenda Operating Systems –Responsibilities –Components –Processes –Examples from Windows/Unix 4

Hierarchy of software User-level applications System utilities User-interface to operating system kernel (window manager, shell) Kernel 5

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Responsibilities Shell/Window manager –Interactions with users File manager –Manages files in secondary storage (e.g. stored on a hard drive) –Directories/Files/Permissions Device manager / device drivers –Printers, cable modems, USB sticks, displays, etc. Memory manager –Manages main memory –Virtual memory and paging Process manager –Controls access to CPU 9