Yup! This is exactly how context.WithCancel is implemented; <-ctx.Done() is the signal that everything that cares about cancellation listens on. The returned

Yup! This is exactly how context.WithCancel is implemented; <-ctx.Done() is the signal that everything that cares about cancellation listens on. The returned CancelFunc just does `close(thatChannel)`. I prefer explicitly using contexts for cancellation, but in a pinch: c := make(chan struct{}) foo(c) bar(c) close(c) is a useful pattern. (I do this a lot in tests that involve concurrency; the test calls t.Cleanup(func() { close(c) }) and then if the test fails with t.Fatal or something, all background work is killed.)