GATE CSEIT/Operating System/ Process Synchronization Introduction Race Condition In very simple language

Lui Kreyszig

2 months ago

https://www.gyanodhan.com/video/7B7.%20GATE%20CSEIT/Operating%20System/637.%20Process%20Synchronization%20%20%20Introduction%20%20%20Race%20Condition%20In%20very%20simple%20language.mp4

Sure! Here’s a very simple and clear explanation of Process Synchronization and Race Condition for GATE (CSE/IT):

Contents

1 Topic: Process Synchronization – Introduction & Race Condition

Topic: Process Synchronization – Introduction & Race Condition

Subject: Operating System
For: GATE CSE/IT

What is Process Synchronization?

Imagine two people trying to edit the same Google Doc at the same time. If they don’t coordinate, one person’s changes might overwrite the other’s. That’s why they need to take turns or work carefully together.

In computers, multiple processes (programs in execution) often need to access shared resources like:

Variables
Files
Printers
Memory

To prevent problems, we use process synchronization — a way to ensure only one process uses the resource at a time.

What is a Race Condition?

Think of a race: two processes are racing to access and change the same variable.
If timing is not controlled, the output can become wrong or unexpected.

Example (Very Simple):

Let’s say two processes want to increase a variable x by 1.
Initial value: x = 5

Both do:

Without Synchronization (Race Condition):

Both read x = 5
Both calculate x + 1 = 6
Both write back x = 6
Wrong! It should be x = 7

This is called a race condition – because both processes raced to change the variable, and the final result is wrong.

What is the Solution?

We use synchronization techniques like:

Locks/Mutex
Peterson’s Algorithm
Semaphores
Monitors

These ensure that only one process enters the “Critical Section” at a time (Critical Section = part of code that accesses shared resources).

Key Takeaways for GATE:

Race condition occurs when multiple processes access and modify shared data at the same time without coordination.
Process synchronization prevents race conditions.
Critical Section Problem is solved by ensuring:
1. Mutual Exclusion
2. Progress
3. Bounded Waiting

Would you like:

A short PDF version of this for revision?
A visual diagram of race condition vs synchronized execution?
Practice GATE MCQs on this topic?

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GATE CSEIT/Operating System/ Process Synchronization Introduction Race Condition In very simple language