CSCI 340 Operating Systems Principles

Project 2: Pet Store Adoption Event with Semaphores

Objective: To create a program that handles "multi-threading" while ensuring data integrity by establishing mutual exclusion between threads to eliminate race conditions.

Language: Java

Notable Libraries: java.util.concurrent.Semaphore

Notable Classes/Interfaces/Objects: Runnable interface, Thread object, Semaphore object

Implementation:

• Created separate classes for each category of threads.
• Used binary semaphores (mutex) to protect critical sections (counters).
• Used a randomized sleep method to simulate real-world events.
• Logged time for each activity to display elapsed time.

Outcome:

A Java program simulating a "Pet Store Adoption" event using multi-threads of different categories (Customer, Cashier, Adoption Clerk). It ensures mutual exclusion between threads and protects critical sections by implementing binary semaphores. Finally, it prints a detailed activity log with time as the program output.