⚡ Parallel Task Manager (C++ with Pthreads & OpenMP)

This project is a C++ console application that demonstrates parallel programming concepts using both POSIX Threads (pthreads) and OpenMP.
It simulates a simple Task Manager, where multiple tasks run in parallel, log their execution, and report results.

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📖 Overview

The program creates six different tasks, executes them concurrently using pthreads with mutex-based synchronization,
and then re-implements the same tasks using OpenMP with critical regions.

This project showcases:

• Multi-threading with pthreads
• Synchronization with mutex locks
• Parallel sections with OpenMP
• Performance comparison between pthreads and OpenMP

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🎮 Implemented Tasks

Each thread simulates a different system-like task:

1. Factorial Calculation
   • Computes factorial of a number.
2. Fibonacci Sequence
   • Computes the nth Fibonacci number.
3. Prime Number Counter
   • Counts all prime numbers up to 100,000.
4. File Download Simulation
   • Simulates downloading a file with percentage updates.
5. Directory Scan Simulation
   • Simulates scanning a folder and listing files.
6. Random Number Generator
   • Generates and prints random numbers.

Each task reports:

• Start & finish messages
• Execution result (e.g., factorial result, Fibonacci number, prime count, etc.)
• Execution time

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🧵 Threading & Synchronization

🔹 Pthreads Implementation

• Uses pthread_create to launch threads.
• Each thread logs its execution details in a shared vector taskLogs.
• A mutex lock (pthread_mutex_t) ensures that logs are written safely without race conditions.
• Main thread waits for completion using pthread_join.

🔹 OpenMP Implementation

• Uses #pragma omp parallel sections to run tasks in parallel.
• Shared log storage (taskLogsOmp) is protected by #pragma omp critical sections.
• No manual thread creation/joining needed.

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📂 Project Structure

parallel-task-manager-cpp/
│
├── src/
│   └── parallel_task_manager.cpp   # Main C++ source code
│
├── README.md              # Project documentation
└── LICENSE                # MIT License

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▶️ How to Run

🔧 Compile with Pthreads

g++ src/task_manager.cpp -o task_manager -lpthread
./parallel_task_manager

🔧 Compile with OpenMP

g++ src/task_manager.cpp -o task_manager -fopenmp
./parallel_task_manager

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📸 Sample Output

[Thread 1] Starting Factorial Task...
[Thread 2] Starting Fibonacci Task...
[Thread 3] Starting Prime Number Task...
[Thread 4] Starting Download File Task...
[Thread 5] Starting Directory Scan Task...
[Thread 6] Starting Random Number Task...
...
[Thread 1] Done!!! Result = 40320
[Thread 2] Done!!! Fibonacci(18) = 2584
[Thread 3] Done!!! Primes Found Between (2-100000). Count = 9592
[Thread 4] File Download Completed :)
[Thread 5] Directory Scan Completed :)
[Thread 6] Random Numbers = 72 15 93 40 61

<<<<<<<< [Pthreads + Mutex] Execution Time: 12.452891 seconds. >>>>>>>>
!! PASSING TO THE OpenMP !!

<<<<<<<< [OpenMP] Execution Time: 15.823712 seconds. >>>>>>>>

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🚀 Future Improvements

• Add more task types (e.g., sorting, matrix multiplication).
• Store logs in external files.
• Visualize thread execution timeline.
• Compare performance across different system configurations.

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🛠️ Technologies

• Language: C++17
• Threading APIs: POSIX Threads (pthreads), OpenMP
• Synchronization: Mutex locks, critical sections
• Libraries: <pthread.h>, <omp.h>, <chrono>, <thread>, <vector>

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📜 License

This project is licensed under the MIT License.
See the LICENSE file for details.