Computer Science 330
Operating Systems

Fall 2025, Siena University

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Agenda

• Announcements
  • The next readings/activities from OS zyBook: Chapter 9, Sections 5-7, due before class on Friday, October 10
• Exam 1 is Monday
  • see previous pages and email
  • two time options: regular class time, or 6-8 PM, you choose
• Any wrapup discussion on Programming Project 1: CPU Scheduler Simulation [HTML] [PDF]
• Brief look at the exercises for OS zyBook Chapter 9, Section 1
• Semaphores
  • abstract synchronization primitive
  • wait/signal semantics
  • using to solve the critical section problem
  • implementation idea
  • POSIX semaphores
  • pthreads mutexes
  • using as a general synchronization tool
• Classical problems of synchronization
  • Bounded Buffer with no busy waits
• Lab 4: Interleavings [HTML] [PDF]

Examples

• https://github.com/SienaCSISOperatingSystems/prodcons-examples

Links

• Internet archive of semaphores.com
• Railroad Signals, Safely Keeping Trains On The Move