Intermittent NSInternalInconsistencyException when using gocv on macOS

Question content

I have code using gocv (Provides go language bindings for opencv). It just draws some rectangles on the image and displays the result.

func main() {
resp, err := http.get("http://localhost:6060/template-match")
if err != nil {
    panic(err)
}

defer resp.body.close()
body, err := ioutil.readall(resp.body)
if err != nil {
    panic(err)
}
fmt.println(string(body))
var data response
err = json.unmarshal(body, &data)
if err != nil {
    panic(err)
}
srcimage := gocv.imread("./images/src1.jpg", gocv.imreadcolor)
for i := 0; i < len(data.data); i++ {
    gocv.rectangle(&srcimage, data.data[i], color.rgba{r: 255}, 2)
}
window := gocv.newwindow("match-result")
window.imshow(srcimage)
gocv.waitkey(0)
fmt.println(data.data, data.msg)

I get this error:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'NSWindow drag regions should only be invalidated on the Main Thread!'

I'm really confused because this error doesn't happen every time

Correct answer

I haven't used this library but it looks like this A Known Issue - Also, since you mentioned that it only happens sometimes, it sounds like the bug does depend on the thread context. The answers there (from the library author) point to https://github.com/golang/go/wiki/lockosthread, so your main package should implement something similar

func init() {
    runtime.LockOSThread()
}

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