Concurrency Exercises

Concurrency Exercises

Practice goroutines, channels, and concurrency patterns with these exercises progressing from basic to advanced.

Exercises in This Section

Exercise	Difficulty	Time	Description
Goroutine Counter	Easy	10 min	Build a thread-safe counter using goroutines
Channel Ping-Pong	Easy	10 min	Implement bidirectional channel communication
Worker Pool	Medium	20 min	Create a pool of workers processing jobs
Rate Limiter	Medium	25 min	Build a token bucket rate limiter
Pipeline Processor	Hard	30 min	Implement a concurrent data processing pipeline

Key Concepts Covered

• Goroutines: Lightweight concurrent execution
• Channels: Safe communication between goroutines
• Select: Multiplexing channel operations
• Sync primitives: Mutex, WaitGroup, Once
• Patterns: Worker pools, fan-out/fan-in, pipelines

Prerequisites

Before starting these exercises, you should be comfortable with:

• Basic Go syntax and types
• Functions and methods
• Chapter 4: Goroutines & Channels
• Chapter 5: Sync Primitives

Tips

1. Always use channels or sync primitives to protect shared state
2. Consider using context.Context for cancellation in real-world code
3. Use go run -race to detect race conditions