go-concurrency-patterns
Master Go concurrency with goroutines, channels, sync primitives, and context. Use when building concurrent Go applications, implementing worker pools, or debugging race conditions.
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SKILL.md
Go Concurrency Patterns
Production patterns for Go concurrency including goroutines, channels, synchronization primitives, and context management.
When to Use This Skill
- Building concurrent Go applications
- Implementing worker pools and pipelines
- Managing goroutine lifecycles
- Using channels for communication
- Debugging race conditions
- Implementing graceful shutdown
Core Concepts
1. Go Concurrency Primitives
| Primitive | Purpose |
|---|---|
goroutine | Lightweight concurrent execution |
channel | Communication between goroutines |
select | Multiplex channel operations |
sync.Mutex | Mutual exclusion |
sync.WaitGroup | Wait for goroutines to complete |
context.Context | Cancellation and deadlines |
2. Go Concurrency Mantra
Don't communicate by sharing memory;
share memory by communicating.
Quick Start
package main
import (
"context"
"fmt"
"sync"
"time"
)
func main() {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
results := make(chan string, 10)
var wg sync.WaitGroup
// Spawn workers
for i := 0; i < 3; i++ {
wg.Add(1)
go worker(ctx, i, results, &wg)
}
// Close results when done
go func() {
wg.Wait()
close(results)
}()
// Collect results
for result := range results {
fmt.Println(result)
}
}
func worker(ctx context.Context, id int, results chan<- string, wg *sync.WaitGroup) {
defer wg.Done()
select {
case <-ctx.Done():
return
case results <- fmt.Sprintf("Worker %d done", id):
}
}
Detailed patterns and worked examples
Detailed pattern documentation lives in references/details.md. Read that file when the navigation tier above is insufficient.
Best Practices
Do's
- Use context - For cancellation and deadlines
- Close channels - From sender side only
- Use errgroup - For concurrent operations with errors
- Buffer channels - When you know the count
- Prefer channels - Over mutexes when possible
Don'ts
- Don't leak goroutines - Always have exit path
- Don't close from receiver - Causes panic
- Don't use shared memory - Unless necessary
- Don't ignore context cancellation - Check ctx.Done()
- Don't use time.Sleep for sync - Use proper primitives
Files
2- SKILL.md
a66d04f2c62.7 KB - references/details.md
a593801def10.7 KB
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