Qt使用线程以及线程同步

把信号连接过来的事件，放到线程中的槽函数处理，达到该槽函数的处理不会卡主线程的效果

例子如下：

class Dummy : public QObject
{
   Q_OBJECT
public:
   Dummy(QObject* parent = 0) : QObject(parent){}
public slots:
   void emitsig() {emit sig();}
signals:
   void sig();
};
///////////////////////////////////////////////////////////////////////////////////////
class Object : public QObject
{
    Q_OBJECT
public :
Object(){}
public slots:
    void slot(){qDebug() << "from thread slot:" << QThread::currentThreadId();}
};
///////////////////////////////////////////////////////////////////////////////////////
include "main.moc"
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    qDebug() << "main thread:" << QThread::currentThreadId();

    QThread thread;
Object obj;
    Dummy dummy;

    obj.moveToThread(&thread);//把槽函数操作移到子线程中处理
    QObject::connect(&dummy, SIGNAL(sig()), &obj, SLOT(slot()));
    thread.start();
    dummy.emitsig();//发送测试信号

return a.exec();
}
// 输出:
// main thread: 0x1a5c
// from thread slot: 0x186c

线程的ID不同，表明slot在子线程中运行 

具体可参考http://blog.csdn.net/c05170519/article/details/6459809