QT之线程池

run.h

#ifndef RUN_H
#define RUN_H

#include <QObject>
#include <QRunnable>
#include <string>
#include <iostream>

struct MyString
{
    std::string valueStr;   //定义结构体
};

class Run : public QObject , public QRunnable
{
    Q_OBJECT
public:
    Run() = default;
    Run(const MyString& myString);
protected:
    ~Run() = default;
    void run(); //重写run函数
signals:

public slots:

private:
    MyString myString;
};

#endif // RUN_H

run.cpp

#include "run.h"
#include <QThread>
#include <QDebug>
Run::Run(const MyString &myString)
{
    this->myString = myString;
    //this->setAutoDelete(true);//默认就是true ，自动回收
}

void Run::run()
{
    //std::cout << "value:" << this->myString.valueStr <<";调用线程ID为：" << QThread::currentThread() << std::endl;
    qDebug() << "value:" << QString::fromStdString(myString.valueStr) << "thread:" << QThread::currentThreadId();
    QThread::msleep(100);
}

main.cpp

#include <QCoreApplication>
#include "run.h"
#include <queue>
#include <mutex>
#include <QThreadPool>
#include <thread>
using namespace std;
queue<MyString> myList;
mutex myMutex;
volatile bool addThreadIsEnd = false;   // 加入生产者是否结束
void makeListThread();
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    cout << "begin main" << endl;
    thread addThread(makeListThread);   // 加入生产者
    addThread.detach();
    cout << "begin addThread" << endl;
    QThreadPool tp;
    tp.setMaxThreadCount(20);
    cout << "begin threadPool" << endl;
    while(true)
    {
        if(!myList.empty())
        {
            MyString tempMyString = myList.front(); //取出队列第一个元素
            tp.start(new Run(tempMyString));　　// 这里new了一个没有指针指向的Runnable对象，在哪里回收的呢？Run.setAutoDelete(true)自动回收
            myMutex.lock();     // 加锁
            myList.pop();
            myMutex.unlock();   // 解锁
        }
        else
        {
            if(addThreadIsEnd)
            {
                break;
            }
            else
            {
                QThread::msleep(10);
            }
        }
    }
    cout << "end main,list size:" << myList.size() << endl;
    return a.exec();
}

void makeListThread()
{
    string a;
    MyString tempMyString;
    for(int i=0;i<100;i++)
    {
        QThread::msleep(0);
        a = to_string(i);
        tempMyString.valueStr = a;
        myMutex.lock();
        myList.push(tempMyString);  // 进队
        myMutex.unlock();
    }
    addThreadIsEnd = true;
    cout << "end addThread" << endl;
}

代码来自：https://www.cnblogs.com/judes/p/11013450.html

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