Computer Science 225
Advanced Programming

Spring 2020, Siena College

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Agenda

• Welcome "Back" - hope everyone is safe and healthy
• Announcements
  • Problem Set 4
    • the late clock started today
    • grading will begin soon
  • Lab 5: Object-Oriented and Recursive Graphics due at the usual start time for your lab session this week
  • Watch email this afternoon for Lab 6: Animation
• Adjusting to our new mechanism for interaction (see class home page)
• Dangers of concurrency (see "lect20" videos, topic notes)
• Problem Set 5: see the email, form groups if you wish, create repositories
• In-class exercise (3 points), submit by email as plain text

  List all of the possible interleavings of the instrutctions in the notes where Thread A and Thread B concurrently execute an increment and a decrement of the same variable counter. In which interleavings will counter have the correct final value (that is, the same as it was when we started)?

Terminology

• interleaving of operations
• interference
• race condition
• process or thread synchronization

Examples

• ATMConcurrency