2021-05-14 thread已经退出析构qtcreator中仍显示thread正在运行

threadobject已经析构，thread.isrunning 是false，thread.isfinishing() 也是true，说明thread退出了，但是qtcreator调试窗口中还是可见Qthread状态竟然是正在运行，什么鬼， 特此记录下这个现象。待解。

记录:sockect只能在同一个线程对象中使用.在同一个线程创建的变量也只能在当前线程使用。在实际运用中，切记不可跨线程去使用其他线程里面的变量等。若业务需求必须要使用其他线程的数据，可通过信号槽 将该数据emit出去，由其他线程接收再进行使用。

//重写QTcpServer中的incomingConnection函数，当监听到有连接时，会调用此函数
void MyServer::incomingConnection(qintptr socketDescriptor)
{
    qDebug() << "主线程id:" << QThread::currentThread();
    Thread1 *thread = NULL;

    QMap<int, Thread1*>::iterator iter = m_mapThread.find(socketDescriptor);
    if(iter != m_mapThread.end())
        thread = iter.value();
    else
    {
        thread = new Thread1(socketDescriptor);
        m_mapThread[socketDescriptor] = thread;
    }

    //connect(thread,SIGNAL(finished()),thread,SLOT(deleteLater()));//删除thread对象
    thread->start();
}

thread1.cpp
Thread1::Thread1(int socketDescriptor,QObject *parent) :
    QThread(parent)
{
    m_socketDescriptor = socketDescriptor;
}

Thread1::~Thread1()
{
    qDebug() << "调用线程1析构函数" << QThread::currentThread();
    if(m_socket != NULL)
    {
        delete m_socket;
        m_socket = NULL;
    }
}

void Thread1::run()
{
    qDebug() << "启动Thread1 run()函数" << QThread::currentThread();
    m_socket = new QTcpSocket();
    if(m_socket->setSocketDescriptor(m_socketDescriptor))
    {
        qDebug()<<"setSocketDescriptor  success!";
    }
    else
    {
        qDebug()<<"setSocketDescriptor  error!";
    }

    //创建线程2,处理socket槽函数
    Thread2 *thread2 = new Thread2(m_socket);
    thread2->start();


    QEventLoop loop;
    connect(thread2, SIGNAL(finished()),&loop, SLOT(quit()));//阻塞thread1,直到thread2退出run()
    loop.exec();

    //删除thread2
    if(thread2 != NULL)
    {
        delete thread2;
        thread2 = NULL;
    }
    qDebug() << "退出Thread1 run()函数" << QThread::currentThread();
}
thread2.cpp
Thread2::Thread2(QTcpSocket *socket,QObject *parent) :
    QThread(parent)
{
    m_socket = socket;
}

Thread2::~Thread2()
{
    qDebug() << "调用Thread2析构函数" << QThread::currentThread();
}

void Thread2::run()
{
    qDebug() << "启动Thread2 run()函数" << QThread::currentThread();

    connect(m_socket,SIGNAL(readyRead()),this,SLOT(readData()));

    QEventLoop loop;
    QObject::connect(m_socket, SIGNAL(disconnected()), &loop, SLOT(quit()));//socket断开退出thread2 run()函数
    loop.exec();

    qDebug() << "退出Thread2 run()函数" << QThread::currentThread();
}

void Thread2::readData()
{
    qDebug() << "[" << QThread::currentThread() << "]" << "读取客户端数据:" << m_socket->readAll();
}
test.cpp
void Dialog::on_pushButton_clicked()
{
    int isz = m_server->m_mapThread.size();
    QMap<int, Thread1*>::iterator iter = m_server->m_mapThread.begin();
    while (iter != m_server->m_mapThread.end())
    {
        int h = iter.key();
        Thread1* th = iter.value();
        if(th->isFinished())
            qDebug()<<"h:"<<h<<"thread is finished";
        if(th->isRunning())
            qDebug()<<"h:"<<h<<"thread is isRunning";
        iter++;
    }
}