嵌入式ARM开发板Cortex-A5，运行Qt程序，黑屏 GUI线程/子线程均正常工作

        开发板环境：Linux mcuzone 4.1.0-linux4sam_5.3 #154 Fri Nov 25 18:27:57 CST 2016 armv7l GNU/Linux
由于项目需要，Qt程序需要实时显示从CAN口传来的数据。若把采集数据代码放到MainWindow的Gui线程中，屏幕会假死（qApp->processEvent效果不好），所以开启线程采集数据。第一次开机启动Qt程序时，点击Button弹出Dialog的时，界面会发生抖动（闪屏）界面会黑屏，此时，GUI线程能正常工作（每秒打印一句话），数据子线程也正常工作（能打印），若杀死该程序并重新启动后，闪屏黑屏现象消失，程序能一直正常工作。
        若将   thread->start(); 屏蔽，即关闭子线程。则第一次开启只会闪屏，并不会黑屏（%99不黑屏）！
        若将子线程中的数据部分全部去掉，第一次开启还是有可能会黑屏的！

关键代码：
MainWindow.cpp

    thread = new Thread;
    connect(thread,SIGNAL(DISPLAY_DZ_DATA()),this,SLOT(DISPLAY_DZ_DATAMain()));
    thread->start();


/***/

thread.h  
     class Thread : public QThread
{
    Q_OBJECT
public:
    Thread();
    ~Thread();

    void stop();

protected:
    void run();

private:
    QMutex mutex;
    volatile bool stopped;
    uint32_t dlen;

signals:
    void DISPLAY_DZ_DATA();
};

/*****/
thread.cpp
    Thread::~Thread()
{

}

void Thread::run()
{
    int jishuqi = 0;
#if 1
    can = 1;
    s =  PanelSocketCanOpen(can);
#endif
    while(threadisrun == 0)
    {
        mutex.lock();
        printf("jishuqi:%d\n",jishuqi);
        jishuqi++;
/*
        dlen = PanelCanRecvData(s,bufferOriginal,sizeof(bufferOriginal));  //从CAN口接收数据
   //     printf("PanelCanRecvData have got,dlen = %d\n",dlen);

        uint8_t *OriginalPoint;  //指针，指向数组
        uint8_t bufType;
        int8_t bufState;
        bufType = bufferOriginal[0];
        bufState = bufferOriginal[1];
        OriginalPoint = &bufferOriginal[2];
        if(ParamInfo._packTyp == COMMAND_CODE_DZ_GET){
                    if (ParamInfo._devId == 6 || ParamInfo._devId == 7 || ParamInfo._devId == 8){
     //                   emit DISPLAY_DZ_DATA();
                        for (int i = 0; i<TRUE_YCDZ_DOT; ++i){
                            //            printf("1_ParamInfo._paramDatas[%d] = %02X\n",i,ParamInfo._paramDatas);
                        }
                    }
        }
*/
         ......更多工作代码......
        mutex.unlock();
        msleep(200);//不加这句CPU占用率高达50%
    }
}