BCA-205N · Operating System
Unit 4
Process Synchronization, Concurrency & Deadlocks
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Unit 4 Learning Hub
Process Synchronization, Concurrency & Deadlocks
Official MJPRU BCA Unit 4: Process Synchronization, Concurrency & Deadlocks for BCA-205N (Operating System).
Syllabus Topics:Concurrent Processes: Cooperating vs Independent Processes, Shared Memory & Message Passing CommunicationThe Critical Section Problem: Race Conditions, Producer-Consumer Buffer Counter ProblemRequirements for Solutions to Critical Section: Mutual Exclusion, Progress, Bounded WaitingSoftware Solutions: Peterson's Algorithm for Two Processes, Correctness Proof (Mutual Exclusion, Progress, Bounded Waiting)Hardware-Assisted Synchronization: Atomic Instructions (Test-and-Set, Compare-and-Swap)Semaphores: Dijkstra's Primitive, Counting Semaphores vs Binary Semaphores (Mutexes)Semaphore Operations: wait() / P() and signal() / V() Atomic Implementations, Spinlock vs Blocking SemaphoresClassical Synchronization Problems: Bounded-Buffer (Producer-Consumer) Problem using SemaphoresThe Readers-Writers Problem: Reader Priority vs Writer Priority, Starvation MitigationThe Dining Philosophers Problem: Resource Allocation Deadlock, Deadlock-Free Symmetric SolutionsMonitors: High-Level Language Synchronization Construct, Condition Variables (wait, signal)Deadlock Definition: Necessary Coffman Conditions (Mutual Exclusion, Hold and Wait, No Preemption, Circular Wait)Resource Allocation Graphs (RAG): Request Edges, Assignment Edges, Cycle Detection in Single vs Multi-Instance SystemsDeadlock Prevention: Negating Coffman Conditions (Eliminating Hold & Wait, Preempting Resources, Linear Ordering of Resources)Deadlock Avoidance & Safe State: Concept of Safe Sequences, System Transition State TrajectoryBanker's Algorithm (Edsger Dijkstra): Data Structures (Available, Max, Allocation, Need), Safety and Resource-Request AlgorithmsDeadlock Detection & Recovery: Wait-For Graphs for Single Instances, Matrix Detection Algorithm, Process Termination & Rollback
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Introduction to Computers & The IPO Cycle
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Topic 1 · The foundation of modern computing
Introduction to Computers & The IPO Cycle
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Ready to master this concept? Give it a quick read & tap the check!
💡 The Big Picture:A computer is an electronic system that takes raw data as Input, processes it under programmed logic, and produces meaningful Information as Output.
🍪 Everyday Analogy:Think of baking cookies: Flour & Sugar (Input) ➔ The Oven (Processing) ➔ Warm Delicious Cookie (Output)! 🍪
Key Exam Takeaways
- ·Data = Raw, unprocessed facts without context (e.g. 42, 'apple').
- ·Information = Structured data with meaning (e.g. 'Temperature: 42°C').
- ·Hardware is what you can touch; Software is the instructions running inside.
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Which of the following represents unprocessed raw facts?
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