Killing QThread inside of object. How?

bogong

Hello all!
I've got an inheritance from previous developer where QThread objects is inside of root object. Something like this:

class Class : public QObject {

	Q_OBJECT

	public:
		
		CustomObject* customObject1 = nullptr;
		CustomObject* customObject1 = nullptr;

		QThread* threadHighest;
		QThread* threadHigh;
		QThread* threadNormal;
		QThread* threadLow;
		QThread* threadLowest;

At the class constructor:

threadHighest = new QThread(this);
threadHighest->start(QThread::Priority::HighestPriority);

threadHigh = new QThread(this);
threadHigh->start(QThread::Priority::HighPriority);

threadNormal = new QThread(this);
threadNormal->start(QThread::Priority::NormalPriority);

threadLow = new QThread(this);
threadLow->start(QThread::Priority::LowPriority);

threadLowest = new QThread(this);
threadLowest->start(QThread::Priority::LowestPriority);

and this

customObject1 = new CustomObject();
cusomObject1->moveToThread(threadLow);

customObject2 = new CustomObject();
cusomObject2->moveToThread(threadHigh);

The question is how to kill QThreads correctly at time of killing root object? For now all is working perfectly, but at time of exit of application happening crash.

Christian Ehrlicher

See https://doc.qt.io/qt-5/qthread.html#isInterruptionRequested and https://doc.qt.io/qt-5/qthread.html#wait

Why do you need all this threads?

bogong

@Christian-Ehrlicher I don't need. It's inheritance.

bogong

Issues closed. This works for me:

threadLow->quit();
threadLow->wait();

or

threadLow->exit();
threadLow->wait();

or

threadLow->terminate();
threadLow->wait();

Chris Kawa

The question is how to kill QThreads correctly at time of killing root object?

Call quit() and then wait() for each of the threads. Before you do that signal those custom objects to destroy themselves in their respective threads..

bogong

@Chris-Kawa I've posted the same few seconds above you :-)))

Christian Ehrlicher

@bogong said in Killing QThread inside of object. How?:

I don't need. It's inheritance.

?

Chris Kawa

@bogong I'm a slow typer I guess :) Good for you.