Copyright ©: Nahrstedt, Angrave, Abdelzaher, Caccamo1 University of Illinois at Urbana-Champaign Welcome to CS 241 Systems Programming University of Illinois at Urbana-Champaign Marco Caccamo Sam King

Copyright ©: Nahrstedt, Angrave, Abdelzaher 2 What’s my End Result? Before CS 241:  After CS 241: Can design and code interesting applications: Simple Web servers Internet multiplayer games Chatrooms, instant messaging software

Copyright ©: Nahrstedt, Angrave, Abdelzaher 3 The Team Marco CaccamoSam King (Instructors) Office: 4118 SC 4306 SC Office hours: 11:50-12:50 Wed., Fri.TBD TAs: Wade Fagen Farhana Ashraf Matthew Trower

Copyright ©: Nahrstedt, Angrave, Abdelzaher 4 Newsgroups We encourage discussion on classroom issues Please subscribe to these newsgroups: class.fa10.cs241 (general discussion) class.fa10.cs241.announce (announcements)

Copyright ©: Nahrstedt, Angrave, Abdelzaher 5 The Textbook Introduction to Systems Concepts and Systems Programming University of Illinois Custom Edition Copyright © 2007 Pearson Custom Publishing ISBN Taken from: Operating Systems: Internals and Design Principles, Fifth Edition by William Stallings UNIX™ Systems Programming: Communication, Concurrency, and Threads by Kay A. Robbins and Steven Robbins Computer Systems: A Programmer's Perspective by Randal E. Bryant and David R. O'Hallaron

Copyright ©: Nahrstedt, Angrave, Abdelzaher 6 Your CS 241 “Mission” Come to class, MWF, 11-11:50am Please participate actively… Sign up for one discussion section per week (starting next week) Discussion sections will not meet during the first week of class Read textbook Reading assignments posted on webpage (none this week) Do 2 homeworks Code 6 Short programming assignments (in teams of 2) Short Machine Problems (SMPs) Code 2 Long programming assignments (in teams of 2) Long Machine Problems (LMPs) Take Midterm Take Final (during finals week)  Check already day of final and make sure you’ll be there!!!  If you have already planned to leave campus before day of final, either reschedule your trip or change class! (having a flight ticket or travel plans is not a good reason for a conflict exam)

Copyright ©: Nahrstedt, Angrave, Abdelzaher 7 Grading Final Exam: 35% Mid-term Exam: 25% Homework (two total): 10% Team Machine Problems (8 total): 30% 6 Short Machine Problems 3% 2 Long Machine Problems 6%

Copyright ©: Nahrstedt, Angrave, Abdelzaher 8 Please… MP Submissions: Most will be due at 11:59pm on Monday nights 30% late penalty if submitted no more than 24 hours late (usually Tuesday at 11:59pm) No credit if submitted more than 24 hours late Homework Submissions: Submit in room TBD; no late submission

Please… Regrade requests will be reviewed offline. Regrade requests must be submitted within 1 week from return date Copyright ©: Nahrstedt, Angrave, Abdelzaher 9

10 Introduction What is an operating system? What is it for? What is system programming?

Copyright ©: Nahrstedt, Angrave, Abdelzaher 11 Course Objectives Identify the basic components of an operating system, describe their purpose, and explain how they function. Write, compile, debug, and execute C programs that correctly use system interfaces provided by UNIX (or a UNIX- like operating system).

Copyright ©: Nahrstedt, Angrave, Abdelzaher 12 More Detailed Objectives Understand the Basics (week 1-2) Use UNIX system calls correctly from within C programs Make the OS do tasks (week 3-8) Create and manage processes and threads on UNIX. Exploit OS semaphores and mutexes Control OS scheduling policy parameters. Take advantage of OS signals and signal handlers. Set OS timers and clocks. Manage machine resources (week 9-12) Manage files and I/O on UNIX. Manage memory Exploit DMA Write networked applications (week 13-15) Use communication protocols (TCP/IP) and interfaces (Sockets) Write distributed multi-threaded apps that talk across a network.

Copyright ©: Nahrstedt, Angrave, Abdelzaher 13 Machine Problems Machine Problems will be programmed in ANSI C, using the POSIX standard. Topics: Processes, threads, synchronization, scheduling, file system, memory management, networking, semaphores, deadlocks, and more!

Copyright ©: Nahrstedt, Angrave, Abdelzaher 14 Schedule See class webpage

Copyright ©: Nahrstedt, Angrave, Abdelzaher 15 Your to-do List Today: Visit the class webpage and check out all the info Familiarize yourself with newsgroups (see and subscribe to: class.fa10.cs241 and class.fa10.cs241.announcehttp://news.cs.illinois.edu Find a reference to refresh your C programming skills (e.g., see tutorial below)

Copyright ©: Nahrstedt, Angrave, Abdelzaher 16 Your to-do List Soon: Sign up for a discussion section if you have not already (sections start next week!) Pair up for upcoming machine problems Read “How to study” Guide (see lecture notes on class webpage)How to study