🏥 Hospital Organ Transplant Simulation (UNIX IPC)

📌 Overview

This project is a multi-process simulation of a hospital organ transplant system, implemented in C using UNIX System V IPC mechanisms.

The goal is to model how critical and non-critical patients, surgeons, and donors coordinate in a concurrent environment while respecting synchronization constraints.

This project was developed as part of an Operating Systems / Concurrency course.

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🧠 System Architecture

The system consists of four main processes:

👨‍⚕️ 1. Critical Patients (MaladeCr)

• Send organ requests with high priority
• Receive organs via message queue
• Must be served before non-critical patients

🧍 2. Non-Critical Patients (MaladeNCr)

• Send organ requests with lower priority
• Wait for availability after critical patients

🩺 3. Surgeon (Chirurgien)

• Receives patient requests from message queues
• Transfers requests to donors via a pipe
• Retrieves fabricated organs from shared memory
• Sends results back to patients

🧬 4. Donor (Donneur)

• Produces organs based on received requests
• Deposits organs into a shared buffer (fridge)
• Respects buffer capacity using semaphores

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🔧 IPC Mechanisms Used

Mechanism	Purpose
Message Queues	Communication between patients and surgeon
Shared Memory	Shared organ buffer (fridge)
Semaphores	Synchronization (mutex + empty slots)
Pipes	Surgeon → Donor communication
Fork	Process creation

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🔐 Synchronization Model

• Producer–Consumer problem
• Shared circular buffer
• Semaphores:
  • nvide → number of empty slots
  • mutex → mutual exclusion
• Priority handling for critical patients

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📦 Data Structures

• StructureDemande → organ request
• StructureReponse → transplant result
• ElementTampon → organ unit
• MemoirePartagee → circular shared buffer

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▶️ Compilation & Execution

Compile

gcc -Wall -o hospital hospital.c