在MFC C ++中使用多线程

我是在CPU，MFC C ++上使用多线程的新手。我试图初始化两个CWinThreads并同时作为工作线程运行它们，这在我的头文件中

    CWinThread      *m_thread;  
    CWinThread      *m_thread1; 

在我的cpp文件中，我试图这样称呼他们

    CdecoderD3D9App *decoder_object_1 = new CdecoderD3D9App(460, 1);
    m_thread = AfxBeginThread(MainTread, decoder_object_1);

    CdecoderD3D9App *decoder_object_2 = new CdecoderD3D9App(460, 2);
    m_thread1 = AfxBeginThread(MainTread1, decoder_object_2);

CdecoderD3D9App 是我传递给线程并运行其功能的我的应用程序类，我的线程功能是这样的

UINT Ctesting_projectDlg::MainTread(LPVOID pParam)

{
    clock_t t1, t2;
    t1 = clock(); 
    CdecoderD3D9App *decoder_object_1 = (CdecoderD3D9App *)pParam;
    char *video_source = "my_movie.mp4";



    decoder_object_1->InitInstance();

    decoder_object_1->run_program(video_source);


    t2 = clock(); 
    float diff = (((float)t2 - (float)t1) / 1000000.0F ) * 10;


    return 0;
}


UINT Ctesting_projectDlg::MainTread1(LPVOID pParam)

{
    clock_t t1, t2;
    t1 = clock(); 
    CdecoderD3D9App *decoder_object_3 = (CdecoderD3D9App *)pParam;

    char *video_source = "my_movie.m2v";



    decoder_object_3->InitInstance();




    decoder_object_3->run_program(video_source);
    t2 = clock(); 
    float diff = (((float)t2 - (float)t1) / 1000000.0F ) * 10;

    return 0;
}

当我调用线程函数时，仅第二个线程正在运行，第一个线程开始运行，但是在第一个线程停止时调用第二个线程。无论如何，我可以同时运行它们吗？我必须在程序中同时运行四个这样的线程。谢谢你。