QThread test

[墨香年少 32]

counter.h:

#ifndef COUNTER_H
#define COUNTER_H

#include <QObject>
#include <QThread>
#include <QDebug>
#include <QRandomGenerator>

class Counter : public QObject
{
    Q_OBJECT
public:
    explicit Counter(QObject *parent = nullptr);

signals:
public slots:
    void start();
};

#endif // COUNTER_H

counter.cpp:

#include "counter.h"

Counter::Counter(QObject *parent)
    : QObject{parent}
{

}

void Counter::start()
{
    for (int var = 0; var < 20; var++)
    {
        qInfo() << "[" << QThread::currentThread()->objectName() << "]" << var;
        int value = static_cast<unsigned long>(QRandomGenerator::global()->bounded(500));
        QThread::currentThread()->msleep(value);
    }

    QThread::currentThread()->quit();
}

manager.h:

#ifndef MANAGER_H
#define MANAGER_H

#include <QObject>
#include <QThread>
#include <QDebug>
#include "counter.h"

class Manager : public QObject
{
    Q_OBJECT
public:
    explicit Manager(QObject *parent = nullptr);
    void start();
signals:
public slots:
    void started();
    void finished();
private:
    QList<QThread*> threads;
};

#endif // MANAGER_H

manager.cpp:

#include "manager.h"

Manager::Manager(QObject *parent) : QObject{parent}
{
    for (int var = 0; var < 5; var++)
    {
        QThread* thread = new QThread(this);
        thread->setObjectName("thread"+QString::number(var));

        qInfo() << "Created:" << thread->objectName();

        connect(thread,&QThread::started,this, &Manager::started);
        connect(thread,&QThread::finished,this, &Manager::finished);

        threads.append(thread);
    }
}

//Start
void Manager::start()
{
    qInfo() << "Starting...";

    foreach (QThread* thread, threads)
    {
        Counter* c = new Counter();
        c->moveToThread(thread);

        connect(thread,&QThread::started, c, &Counter::start);
        thread->start();
    }
}

void Manager::started()
{
    QThread* thread = qobject_cast<QThread*>(sender());
    if(!thread) return;
    qInfo() << "started:" << thread->objectName();
}

void Manager::finished()
{
    QThread* thread = qobject_cast<QThread*>(sender());
    if(!thread) return;
    qInfo() << "finished:" << thread->objectName();
}

main.cpp:

#include <QCoreApplication>
#include <QThread>
#include <QDebug>
#include "manager.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QThread::currentThread()->setObjectName("MainThread");
    qInfo() << "Current Thread:" << QThread::currentThread()->objectName();

    Manager m;
    m.start();

    return a.exec();
}

---

result:

00:17:32: C:\Users\Administrator\Documents\build-threadTest-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\threadTest.exe crashed.

00:17:42: Starting C:\Users\Administrator\Documents\build-threadTest-Desktop_Qt_6_5_2_MSVC2019_64bit-Debug\threadTest.exe...
Current Thread: "MainThread"
Created: "thread0"
Created: "thread1"
Created: "thread2"
Created: "thread3"
Created: "thread4"
Starting...
[ "thread2" ] 0
[ "thread4" ] 0
started: "thread2"
[ "thread4" ] 1
[ "thread1" ] 0
[ "thread0" ] 0
[ "thread3" ] 0
started: "thread0"
started: "thread4"
started: "thread1"
started: "thread3"
[ "thread1" ] 1
[ "thread4" ] 2
[ "thread3" ] 1
[ "thread2" ] 1
[ "thread1" ] 2
[ "thread2" ] 2
[ "thread0" ] 1
[ "thread1" ] 3
[ "thread3" ] 2
[ "thread3" ] 3
[ "thread2" ] 3
[ "thread4" ] 3
[ "thread2" ] 4
[ "thread3" ] 4
[ "thread0" ] 2
[ "thread1" ] 4
[ "thread2" ] 5
[ "thread1" ] 5
[ "thread4" ] 4
[ "thread3" ] 5
[ "thread3" ] 6
[ "thread1" ] 6
[ "thread0" ] 3
[ "thread3" ] 7
[ "thread3" ] 8
[ "thread2" ] 6
[ "thread1" ] 7
[ "thread4" ] 5
[ "thread1" ] 8
[ "thread2" ] 7
[ "thread0" ] 4
[ "thread4" ] 6
[ "thread3" ] 9
[ "thread0" ] 5
[ "thread0" ] 6
[ "thread4" ] 7
[ "thread2" ] 8
[ "thread4" ] 8
[ "thread0" ] 7
[ "thread2" ] 9
[ "thread3" ] 10
[ "thread1" ] 9
[ "thread0" ] 8
[ "thread4" ] 9
[ "thread3" ] 11
[ "thread2" ] 10
[ "thread1" ] 10
[ "thread0" ] 9
[ "thread4" ] 10
[ "thread2" ] 11
[ "thread3" ] 12
[ "thread0" ] 10
[ "thread0" ] 11
[ "thread1" ] 11
[ "thread4" ] 11
[ "thread1" ] 12
[ "thread3" ] 13
[ "thread0" ] 12
[ "thread2" ] 12
[ "thread0" ] 13
[ "thread4" ] 12
[ "thread2" ] 13
[ "thread1" ] 13
[ "thread1" ] 14
[ "thread3" ] 14
[ "thread1" ] 15
[ "thread3" ] 15
[ "thread0" ] 14
[ "thread4" ] 13
[ "thread2" ] 14
[ "thread2" ] 15
[ "thread3" ] 16
[ "thread1" ] 16
[ "thread2" ] 16
[ "thread0" ] 15
[ "thread4" ] 14
[ "thread3" ] 17
[ "thread3" ] 18
[ "thread4" ] 15
[ "thread1" ] 17
[ "thread2" ] 17
[ "thread1" ] 18
[ "thread0" ] 16
[ "thread4" ] 16
[ "thread0" ] 17
[ "thread2" ] 18
[ "thread3" ] 19
[ "thread1" ] 19
[ "thread4" ] 17
[ "thread2" ] 19
finished: "thread3"
[ "thread0" ] 18
finished: "thread1"
[ "thread4" ] 18
finished: "thread2"
[ "thread4" ] 19
[ "thread0" ] 19
finished: "thread4"
finished: "thread0"