Computer Science 330
Operating Systems

Fall 2025, Siena University

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Agenda

• Announcements
  • The next readings/activities from OS zyBook: Chapter 7, due Friday, September 19
  • Lab 1: Unix Setup [HTML] [PDF] now due
• Looking at some exercises for OS zyBook Chapter 4
  • 4.1.1
• PCBs and process creation in FreeBSD
• Quick intro to Programming Project 1: CPU Scheduling Simulator

Examples

• In https://github.com/SienaCSISOperatingSystems/procsthreads-examples: forking, forkbomb

Terminology

• process
• process control block (PCB)
• process states: new, terminated, suspended, running, ready, blocked
• context switch
• CPU state
• physical CPU
• time sharing
• virtual CPU
• process creation hierarchy