BCA 3rd Sem | Principle of Operating System|PROCESS control block & principle of concurrency|DAY-08

BCA 3rd Sem | Principle of Operating System|PROCESS control block & principle of concurrency|DAY-08

🖥️ BCA 3rd Semester – Principles of Operating System
🧩 Topic: Process Control Block (PCB) & Principle of Concurrency
🔷 Process Control Block (PCB):
A Process Control Block is a data structure maintained by the Operating System for every process. It stores all the essential information needed to manage and control processes efficiently.

Key Components of PCB:

Process ID (PID): Unique identifier for each process

Process State: (Running, Waiting, Ready, etc.)

Program Counter: Indicates the next instruction to execute

CPU Registers: Holds process-specific register values

Memory Management Info: Page tables, memory limits, etc.

Accounting Info: CPU usage, time limits, job IDs

I/O Status: List of I/O devices assigned to the process

Importance:

Helps in context switching

Allows multitasking and process scheduling

Ensures process isolation and management

🔷 Principle of Concurrency:
Concurrency refers to the ability of an operating system to execute multiple processes simultaneously, either truly in parallel (multi-core systems) or via time-sharing (single-core systems).

Key Concepts:

Process vs Thread: Understanding units of execution

Context Switching: Switching the CPU between processes

Critical Section Problem: Ensuring safe access to shared resources

Mutual Exclusion: Preventing simultaneous access to shared resources

Synchronization Tools: Semaphores, Mutexes, Monitors

Deadlock & Starvation: Conditions and prevention methods

Importance:

Increases CPU utilization and system responsiveness

Allows multitasking and real-time process handling

Manages shared resources without data inconsistency

📝 Learning Outcomes:
By the end of this topic, students will be able to:

Explain the structure and role of the Process Control Block

Understand how the OS manages process context during execution

Apply concurrency concepts to ensure safe and efficient multitasking

Use synchronization techniques to prevent race conditions and deadlocks


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