Computer Science 330
Operating Systems

Fall 2022, Siena College

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Agenda

• Announcements
  • The next readings/activities from OS zyBook: Chapter 5, due at the start of class Friday, October 28
  • Wrapping up Lab 3: Concurrency [HTML] [PDF] and Lab 4: Interleavings [HTML] [PDF]
  • Exam 1 should be back to you on Monday
• 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
• Programming Project 2: Semaphores [HTML] [PDF] introduction
• Any remaining time to work on ongoing labs, start the new project

Examples

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

Links

• Railroad Signals, Safely Keeping Trains On The Move