Program unexpectedly finished using C++11 thread

[Geng.Y]

Hi, I have encounter an issue that when I added C++ thread, program has unexpectedly finished.
To begin with, I call the drawObject(it); iteratively to draw 9 objects, and it works fine. When I tried to use multithreading to complete this task, the process was ended forcefully.

    std::vector<std::thread> threads;
    int i = 1;
    for (auto it : solarSystem->getObjects()){

        if (it->visiblity()){
            glBindTexture(GL_TEXTURE_2D, texture[i]);
            threads.push_back(std::thread(drawObject,it));
//            drawObject(it);
        }

        i++;
    }
    for_each(threads.begin(), threads.end(), mem_fn(&std::thread::join));

[dheerendra]

what is drawObject doing ? Are you doing something with UI here ? Are you creating some widgets there ?

[Geng.Y]

@dheerendra drawObject is to draw a planet on QGLWidget. This part of code is inserted in paintGL().

[Geng.Y]

Now I tried this code on Ubuntu 18.04, the program can run but don't get the result before using threading. (Nothing drew).