Computer Science 225
Advanced Programming

Spring 2020, Siena College

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Agenda

• Announcements
  • Final Project
    • get your group membership and ideas into the shared document by tonight
    • create your group's repository by Wednesday
  • Don't forget, no classes on Friday or next Monday for Easter break. We'll start our sprint to the finish line with labs next Tuesday and Wednesday.
• Exam 2
  • Please accept the invitation to the Google Classroom that I'd like to use for part of the exam, and fill in the document related to that if you have not already done so.
  • Pick any of the lab times, but "sign up" on the Google Classroom document so I know who to expect and when.
  • Join the Zoom meeting before the start of the exam and you will be put into breakout rooms and will be required to share your screens throughout the exam.
  • There is no "closed book" section. For the entire exam, you may access our online class materials and your own code and notes, the standard Java API, and nothing else.
  • Today's new work is not covered on the exam, but should deepen your understanding of thread safety issues, which could be on the exam.
• Thread safety
  • a data structure example of a race condition
  • intrinsic locking with synchronized methods
  • explicit locks to enforce mutual exclution in critical sections
• In-class exercise (3 assignment points)

  Give your answer to the questions in the middle of page 4 of the "More Threads and Animation" notes in a private chat message in Zoom. If not attending synchronously, give your response by an email before watching the lecture beyond that point.

Terminology

• thread safety
• granularity
• intrinsic lock
• mutual exclusion
• critical section
• explicit lock

Examples

• SynchronizedBallTosser