Computer Science 330
Operating Systems

Spring 2012, Siena College

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Agenda

• Announcements
  • log into and change your passwords on the FreeBSD accounts if you haven't yet done so
  • First lab programming continues
• Processes
  • Process creation, fork() system call
  • Process scheduling queues
• Interprocess communication
  • motivation
  • shared memory vs. message passing
  • IPC mechanisms

Lecture Assignment 3

Due at the start of class, Thursday, January 26.

The readings for next class are SG&G Chapter 4.

Please submit answers to these questions either as a hard copy (typeset or handwritten are OK) or by email to jteresco AT siena.edu by the start of class. Please use a clear subject line when submitting by email (e.g., CS 330 Lecture Assignment 3, Joe Student). We will discuss these questions at the start of class, so no late submissions are accepted.

• SG&G Exercise 3.7, p. 134 (3 points)
• SG&G Exercise 3.9, p. 134 (2 points)

You need not submit answers to these questions, but you will have a chance to ask questions about them at the start of class.

• SG&G Practice Exercise 3.4, p. 133.

Examples

• forking
• forkbomb
• FreeBSD fork code: /usr/src/sys/kern/kern_fork.c
• FreeBSD run/ready queues: /usr/src/sys/kern/kern_switch.c
• FreeBSD context switch: /usr/src/sys/i386/i386/swtch.s