Operating System Concepts: Implementations and Examples

Welcome to the Operating Systems repository! This project is a collection of C programs that explore and implement fundamental concepts of operating systems, focusing on system calls, Inter-Process Communication (IPC) mechanisms, threads, signals, and classic synchronization problems.

📖 Table of Contents

• About The Project
• Core Concepts Covered
  • System Calls & Basics
  • Threads & Signals
  • Inter-Process Communication (IPC)
  • Synchronization Problems
  • Applications
• Repository Structure
• Getting Started
  • Prerequisites
  • Compilation and Execution
• Contributing
• License

🌟 About The Project

This repository serves as a practical guide and hands-on implementation hub for key OS concepts. The goal is to provide clear, well-commented code that demonstrates how these low-level functionalities work. Whether you're a student learning about operating systems or a developer looking to refresh your knowledge, you'll find valuable examples here.

🚀 Core Concepts Covered

This repository contains implementations for the following topics:

📞 Basic System Calls

A collection of programs demonstrating the use of fundamental system calls for process management found in the basics directory.

• fork(): Creating child processes.
• wait(): Synchronizing parent and child processes.
• sleep(): Suspending process execution.
• getpid() & getppid(): Retrieving process and parent process IDs.

⚡ Threads & Signals

• Threads: Implementations exploring multi-threading concepts.
• Signals: Programs demonstrating how to handle signals for asynchronous event handling. This includes:
  • Setting up custom signal handlers using signal() and sigaction().
  • Sending signals to processes using the kill() system call.
  • Using signals for inter-process communication, such as in the sharedmemory_signal example.

🔄 Inter-Process Communication (IPC)

Implementations of various IPC mechanisms to allow processes to communicate and synchronize their actions.

• Anonymous Pipes: Unidirectional communication between related processes.
• Named Pipes (FIFO): Communication between unrelated processes (TwoWayCommfifo).
• Shared Memory: Allowing multiple processes to access the same memory segment.
• Polling: Efficiently handling I/O from multiple sources.

🔒 Synchronization Problems

Solutions to classic concurrency and synchronization problems, demonstrating how to avoid race conditions and deadlocks.

• Producer-Consumer Problem
• Reader-Writer Problem
• Dining Philosophers Problem

💻 Applications

Practical applications built using the concepts above to showcase their real-world utility.

• One-to-One Chat System
• Shared Chat System (Group Chat)
• News Room Synchronization

📂 Repository Structure

The code is organized into directories .

Operating_system
├── Anonymouspipes/
├── basics/
├── pipes/
├── poll/
├── sharedmemory/
│ ├── multi_message_Communication/
│ └── ...
├── signals/
│ ├── sharedmemory_signal/
│ ├── sigaction/
| | └── sharedmemory(using signal and handler function)/
│ └── ...
├── Threads/
├── TwoWayCommfifo/
└── Process_Synchronization/
├── Basic/
├── Dinning_Philospher/
├── Producer_consumer/
└── Reader_Writer/

🛠️ Getting Started

Follow these instructions to get the code up and running on your local machine.

Prerequisites

You will need a Cpp compiler (like g++) and a Unix-like operating system (Linux, macOS) to run these examples.

Compilation and Execution

1. Clone the repository:
   git clone [https://github.com/your-username/your-repo-name.git\](https://github.com/your-username/your-repo-name.git)
   cd your-repo-name

2. Navigate to a specific implementation's directory:
   cd pipes/

3. Compile the C file using gcc:

   • For basic programs:
     g++ source_file.cpp -o output_file

   • When using threads (pthreads), you must link the pthread library:
     g++ -lpthread source_file.cpp -o output_file

   • When using the math library, link it with -lm:
     g++ -o output_file source_file.c -lm

4. Run the compiled executable:
   ./output_file

   Note: Some programs, especially the chat applications, may require running multiple executables (e.g., a server and a client) in separate terminal windows.

🙌 Contributing

Contributions are what make the open-source community such an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated.

If you have a suggestion that would make this better, please fork the repo and create a pull request. You can also simply open an issue with the tag "enhancement".

1. Fork the Project
2. Create your Feature Branch (git checkout -b feature/AmazingFeature)
3. Commit your Changes (git commit -m 'Add some AmazingFeature')
4. Push to the Branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

📄 License

Distributed under the MIT License. See LICENSE for more information.

Happy Coding!