How to manage goroutine lifecycles effectively when using Go's context package?
I've spent hours debugging this and Could someone explain After trying multiple solutions online, I still can't figure this out..... I'm working on a personal project and I'm working on a Go application where I need to manage multiple goroutines based on specific contexts. I'm using Go version 1.20 and the `context` package to handle cancellation signals. However, I'm running into an issue where some goroutines continue running even after their respective parent context has been canceled. Here's the relevant code snippet: ```go package main import ( "context" "fmt" "time" ) func worker(ctx context.Context, id int) { defer fmt.Printf("Worker %d done\n", id) for { select { case <-ctx.Done(): fmt.Printf("Worker %d received cancel signal\n", id) return default: // Simulating work time.Sleep(1 * time.Second) fmt.Printf("Worker %d is working...\n", id) } } } func main() { ctx, cancel := context.WithCancel(context.Background()) for i := 0; i < 3; i++ { go worker(ctx, i) } time.Sleep(3 * time.Second) cancel() // Canceling the context time.Sleep(2 * time.Second) // Giving goroutines time to finish } ``` In this example, I expect that once I call `cancel()`, all goroutines should stop working and exit cleanly. However, I'm seeing some of them still print "Worker X is working..." messages before finally exiting. My understanding is that the `ctx.Done()` channel should trigger the cancellation, but it seems that the goroutines are not stopping immediately. Is there a best practice for ensuring that goroutines respect cancellation signals promptly, particularly when there's ongoing work involved? Also, should I consider any additional synchronization mechanisms to ensure a graceful shutdown? For context: I'm using Go on Linux. I'd really appreciate any guidance on this. My team is using Go for this CLI tool. Is this even possible? Any ideas how to fix this? This is part of a larger web app I'm building.