Code Sample for Go Leaks blog post

gistfile1.go

func createAlternateSizes(photoPath string, img image.Image, block bool) error {
  // Put a white background on all the resized images.
  whiteImg := imageWithWhiteBg(img) 

  c := make(chan error, 0)
  go resizeAndWrite(whiteImg, 640, photoPath + "_f", c)
  go resizeAndWrite(whiteImg, 290, photoPath + "_s", c)
  go resizeAndWrite(whiteImg, 200, photoPath + "_d", c)
  
  if block {
    // Wait for three things to come back on the channel.
    for i := 0; i < 3; i++ {
      err = <-c
      if err != nil {
        s.Printf("ERR: %v", err)
        return err
      }
    }
  }
  return nil
}