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