Miracle Emefiele
Laura Zapata

This project simulates how an Operating System schedules processes using different CPU scheduling algorithms.

Algorithms Implemented:

• First-Come, First-Served (FCFS)
• Round Robin (RR)

Process Format Includes:

• Process ID (PID)
• Arrival Time
• Burst Time
• Priority

The Simulation:

• Displays the Gantt Chart showing execution order
• Calculates Waiting Time (WT) and Turnaround Time (TAT)
• Computes average WT and TAT

• main.c: Reads processes.txt, schedules processes using FCFS and RR
• fcfs.c: Implementation of FCFS
• rr.c: Implementation of Round Robin
• processes.txt: Input file listing all processes
• processes.h: Shared structure and function declarations
• report_project1.pdf: Final report

gcc main.c fcfs.c rr.c processes.c -o scheduler ./scheduler

This project simulates real-time process execution using threads and solves the Producer-Consumer synchronization problem using Java threads, semaphores, and synchronized buffer access.

Each process becomes a thread, and CPU burst times are simulated using Thread.sleep().

Producer-Consumer Behavior:

• Producers add processes to a bounded buffer
• Consumers remove and execute processes while ensuring thread-safe access

• Simulator.java: Main driver class that manages producer and consumer threads
• ProcessThread.java: Thread class representing a process with PID and burst time
• processes.txt: Optional input file (can be hardcoded)
• report_project2.docx: Final report for Project 2

Inside the os_project2/ folder:

javac Simulator.java ProcessThread.java java Simulator

Project 1 – Gantt Chart Example

| P1 | P2 | P3 | P4 | 0 2 5 7 12 

Project 2 – Producer-Consumer Example

[Producer] Waiting for buffer space... [Producer] Added Process 2 [Consumer] Retrieved Process 2 [Process 2] started. [Process 2] finished. 

Operating-systems-project/ ├── Project1/ │ ├── fcfs.c │ ├── rr.c │ ├── main.c │ ├── processes.c │ ├── processes.h │ ├── processes.txt │ └── report_project1.pdf │ ├── os_project2/ │ ├── Simulator.java │ ├── ProcessThread.java │ ├── processes.txt │ └── report_project2.docx │ └── README.md 

• Project 1 written in C
• Project 2 implemented in Java
• Project 2 uses Java Semaphores, Threads, and proper synchronization
• Designed and tested in VS Code and standard terminal
• Modular and organized structure for easy grading and extension