Qt:在关闭期间线程仍在运行时，qthread被破坏 [英] Qt: qthread destroyed while thread is still running during closing

问题描述

我有一堂课

class centralDataPool : public QObject
{
    Q_OBJECT
public:
    centralDataPool(QObject * parent = 0);
    ~centralDataPool();
    commMonitor commOverWatch;

private:
    QThread monitorThread;
    int totalNum;

signals:
    void createMonitor(int);
};

在其构造函数中，我做到了:

In its constructor I did:

centralDataPool::centralDataPool(QObject* parent) : QObject(parent),totalNum(0)
{
    connect(this, SIGNAL(createMonitor(int)), &commOverWatch, SLOT(createMonitor(int)));
    commOverWatch.moveToThread(&monitorThread);
    monitorThread.start();
}

当我调用此类的析构函数时，收到错误消息:

when I called the destructor of this class I get the error message:

qthread destroyed while thread is still running

但是当我试图在CentralDataPool类的析构函数中终止monitorThread时，

But when I tried to terminate the monitorThread in the destructor of class centralDataPool,

centralDataPool::~centralDataPool()
{
    monitorThread.terminate();
}

我遇到内存泄漏.

在销毁其所有者对象期间终止线程的正确方法是什么?

What is the correct way to terminate a thread during the destruction of its owner object ?

推荐答案

您应注意，如果在线程的函数中运行循环，则应显式结束该循环，以正确终止线程.

You should note that if you have a loop running in a function of your thread, you should explicitly end it in order to properly terminate the thread.

您可以在类中名为finishThread的成员变量，当应用程序将要关闭时，应将其设置为true.只需提供一个插槽即可在其中设置finishThread的值.当您要终止线程时，发出一个信号，该信号使用true值连接到该插槽.设置为true时，应在循环条件中提供finishThread以结束该条件.之后，等待线程正常完成几秒钟，如果线程未完成，则强制其终止.

You can have a member variable in your class named finishThread which should be set to true when the application is going to close. Just provide a slot in which you set the value for finishThread. When you want to terminate the thread emit a signal that is connected to that slot with a true value. finishThread should be provided in the loop condition to end it when it is set to true. After that wait for the thread to finish properly for some seconds and force it to terminate if it did not finish.

因此您可以使用析构函数:

So you can have in your destructor :

emit setThreadFinished(true); //Tell the thread to finish
monitorThread->quit();
if(!monitorThread->wait(3000)) //Wait until it actually has terminated (max. 3 sec)
{
    monitorThread->terminate(); //Thread didn't exit in time, probably deadlocked, terminate it!
    monitorThread->wait(); //We have to wait again here!
}

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