func ExampleWithTimeout() { // Pass a context with a timeout to tell a blocking function that it // should abandon its work after the timeout elapses. ctx, _ := context.WithTimeout(context.Background(), 100*time.Millisecond) select { case <-time.After(200 * time.Millisecond): fmt.Println("overslept") case <-ctx.Done(): fmt.Println(ctx.Err()) // prints "context deadline exceeded" } // Output: // context deadline exceeded }
func TestCancelReadCloser(t *testing.T) { ctx, _ := context.WithTimeout(context.Background(), 100*time.Millisecond) cancelReadCloser := NewCancelReadCloser(ctx, ioutil.NopCloser(&perpetualReader{})) for { var buf [128]byte _, err := cancelReadCloser.Read(buf[:]) if err == context.DeadlineExceeded { break } else if err != nil { t.Fatalf("got unexpected error: %v", err) } } }