Multithreaded Alarm System in C

This repository contains two implementations of a multithreaded alarm system using POSIX threads in the C programming language. These systems were developed as coursework for EECS3221 (Operating Systems), with one version utilizing mutex locks for thread synchronization and another using semaphores.

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Features

Both implementations support the following functionality:

• Adding, changing, canceling, and viewing alarms.
• Alarms include fields such as Alarm_ID, Type, Time, and Message.
• Thread-safe access to the alarm list using synchronization primitives.
• Three distinct thread types:
  • Main thread: handles user input and command parsing.
  • Alarm thread: manages thread assignments and alarm state.
  • Display threads: periodically print assigned alarms until they expire, are canceled, or changed.

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Directory Structure

Multithreaded-Alarm-System/
│
├── Mutex-Based/                     # Assignment 2 implementation (uses mutexes)
│   ├── new_alarm_mutex.c
│   ├── errors.h
│   ├── Makefile
│   ├── Test_output.txt
│   ├── Report.pdf
│   └── README.md                    # Detailed notes and build instructions
│
├── Semaphore-Based/                 # Assignment 3 implementation (uses semaphores)
│   ├── new_alarm_cond.c
│   ├── errors.h
│   ├── Makefile
│   ├── Test_output.txt
│   ├── Report.pdf
│   └── README.md                    # Detailed notes and build instructions
│
├── 3221E_F24_Mutex-Based.pdf        # Assignment 2 PDF specification
└── 3221E_F24_Semaphore-Based.pdf    # Assignment 3 PDF specification

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Authors

•    Rami Omer
•    Mohammad Zarif
•    Shaylin Ziaei
•    Rayhaan Yaser Mohammed