qt 线程

以下是一个完整的Qt线程池实现示例，结合任务优先级、线程安全、UI交互等高级功能，并包含异常处理机制：

cpp

// mytask.h
#ifndef MYTASK_H
#define MYTASK_H#include <QRunnable>
#include <QObject>
#include <QMutex>
#include <QDebug>class MyTask : public QObject, public QRunnable
{Q_OBJECT
public:explicit MyTask(const QString& data, int priority = 0) : m_data(data), m_priority(priority) {setAutoDelete(true);  // 自动内存管理[4,7](@ref)}void run() override {QMutexLocker locker(&m_mutex);  // 线程安全锁[3,10](@ref)try {// 模拟耗时操作QThread::msleep(100);// 业务处理QString result = processData();emit taskCompleted(result);  // 发送完成信号} catch (...) {qCritical() << "Task failed:" << m_data;}}// 设置优先级（0-100）void setPriority(int priority) { m_priority = qBound(0, priority, 100); }signals:void taskCompleted(const QString& result);private:QString processData() {return m_data.toUpper() + "_PROCESSED";}QString m_data;int m_priority;static QMutex m_mutex;  // 共享资源锁
};#endif // MYTASK_H

cpp

// mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include <QThreadPool>
#include "mytask.h"class MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);~MainWindow();private slots:void onStartTasks();void handleResult(const QString& result);private:void setupThreadPool() {// 配置线程池[1,5](@ref)QThreadPool::globalInstance()->setMaxThreadCount(QThread::idealThreadCount() * 2);QThreadPool::globalInstance()->setExpiryTimeout(30000);  // 30秒空闲回收[7](@ref)}QList<MyTask*> m_tasks;
};
#endif // MAINWINDOW_H

cpp

// mainwindow.cpp
#include "mainwindow.h"QMutex MyTask::m_mutex;MainWindow::MainWindow(QWidget *parent): QMainWindow(parent)
{setupThreadPool();// 创建UI控件和信号连接QPushButton* btn = new QPushButton("Start Tasks", this);connect(btn, &QPushButton::clicked, this, &MainWindow::onStartTasks);
}void MainWindow::onStartTasks()
{// 清空旧任务[5](@ref)QThreadPool::globalInstance()->clear();// 创建100个任务for(int i=0; i<100; ++i){MyTask* task = new MyTask(QString("Task%1").arg(i));// 设置优先级（示例：偶数任务高优先级）task->setPriority(i%2 ? QThread::LowPriority : QThread::HighPriority);// 信号连接[4](@ref)connect(task, &MyTask::taskCompleted, this, &MainWindow::handleResult, Qt::QueuedConnection);QThreadPool::globalInstance()->start(task, task->priority());}// 动态调整线程数[2](@ref)if(QThreadPool::globalInstance()->activeThreadCount() >= QThreadPool::globalInstance()->maxThreadCount()){QThreadPool::globalInstance()->setMaxThreadCount(QThreadPool::globalInstance()->maxThreadCount() + 2);}
}void MainWindow::handleResult(const QString& result)
{qDebug() << "Processed result:" << result;// 实时监控线程池状态[7](@ref)qDebug() << "Active threads:" << QThreadPool::globalInstance()->activeThreadCount()<< "Queue size:" << QThreadPool::globalInstance()->waitingTaskCount();
}// 其他实现...