Computer Science 330
Operating Systems

Fall 2025, Siena University

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Agenda

• Reminder: we are online only today
• Announcements
  • Mid-semester grades were submitted
  • The next readings/activities from OS zyBook: Chapter 14, Sections 1-3, due Friday, October 31 (rest of the chapter Monday, November 3)
  • Lab 5: System V Shared Memory [HTML] [PDF] past due
  • Programming Project 3: Process Synchronization Practice [HTML] [PDF] due tonight
  • Will recap both in class on Monday
• Looking at the exercises for OS zyBook Chapter 12
  • 12.1.1, 12.1.2, 12.1.3, 12.1.4
  • 12.2.1, 12.2.2, 12.2.3, 12.2.4
  • 12.3.1, 12.3.2, 12.3.3, 12.3.4
  • 12.4.1, 12.4.2

Terminology

• resource allocation graph
• blocked process
• resource request, resource acquisition, resource release
• deadlocked process
• deadlocked state, safe state
• completely reducible resource allocation graph
• wait-for graph
• deadlock avoidance
• resource claim graph, maximum claim
• deadlock prevention
• hold-and-wait, circular wait