Why FCFS (First Come First Served) in Operating Systems? - Purpose & Use Cases

The Big Idea

What if the first person in line never got served first? Discover how FCFS fixes this!

The Scenario

Imagine a busy bank where customers line up to be served one by one. Without a clear order, customers might get confused or argue about who should be next.

The Problem

Trying to serve customers randomly or without a clear rule can cause delays, unfairness, and frustration. It's hard to keep track manually who arrived first, leading to mistakes and unhappy customers.

The Solution

FCFS (First Come First Served) is a simple rule that solves this by always serving the customer who arrived first. This clear order makes the process fair, easy to manage, and predictable.

Before vs After

✗ Before

Serve customers as they shout or appear, no order kept

✓ After

Serve customers in the exact order they arrived

What It Enables

It enables fair and organized handling of tasks or requests by respecting their arrival order.

Real Life Example

In an operating system, FCFS schedules processes by running the one that requested CPU time first, ensuring no process is skipped or unfairly delayed.

Key Takeaways

FCFS is a simple, fair scheduling method.

It processes tasks in the order they arrive.

This prevents confusion and ensures fairness.