Handling context cancellation with goroutines in Go 1.19 - advanced patterns
I'm running into a question with goroutines and context cancellation in Go 1.19. I have a simple application that starts a goroutine to perform a long-running task. However, even after I cancel the context, the goroutine seems to continue running instead of terminating gracefully. I expected the goroutine to check for cancellation and stop execution, but it doesn't seem to be behaving as expected. Here's a simplified version of my code: ```go package main import ( "context" "fmt" "time" ) func longRunningTask(ctx context.Context) { for { select { case <-ctx.Done(): fmt.Println("Goroutine cancelled") return default: // Simulating work fmt.Println("Working...") time.Sleep(500 * time.Millisecond) } } } func main() { ctx, cancel := context.WithCancel(context.Background()) defer cancel() go longRunningTask(ctx) time.Sleep(2 * time.Second) cancel() // Cancel the context time.Sleep(1 * time.Second) // Allow time for the goroutine to respond } ``` When I run this code, I see "Working..." printed several times even after the context is cancelled. I thought the goroutine should exit immediately after the cancel call, but it seems to continue execution. Am I missing something in the logic for the goroutine to detect the cancellation properly? Is there a better way to handle this situation or any best practices I should be aware of? I've tried adding additional logging inside the `select` case to see if it ever hits the `ctx.Done()` case, but it doesn't help. I'm genuinely confused about why the cancellation isn't being respected. Am I missing something obvious?