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线程池

【C++并发编程】（九）线程池

QThreadPool 和 QRunnable 是 Qt 提供的线程池管理机制。QRunnable 是一个任务抽象类；定义任务逻辑需要继承QRunnable 并实现 run() 方法。QThreadPool 负责管理线程，并将 QRunnable 任务分配到可用的线程上执行。 通过 QThreadPool::start(QRunnable *task) 提交任务，QThreadPool 会自动选择空闲线程来执行任务。

示例代码

https://github.com/BinaryAI-1024/QtStudy/tree/master/thread/threadpool

// main.cpp
#include <QCoreApplication>
#include <QThreadPool>
#include <QRunnable>
#include <QDebug>
#include <QThread>// 自定义任务类，继承 QRunnable
class MyTask : public QRunnable {
public:void run() override {qDebug() << "Task running on thread:" << QThread::currentThread();QThread::sleep(1);  // 模拟任务执行时间}
};int main(int argc, char *argv[]) {QCoreApplication app(argc, argv);QThreadPool *threadPool = QThreadPool::globalInstance(); // 获取全局线程池threadPool->setMaxThreadCount(4);  // 设置最大线程数for (int i = 0; i < 10; ++i) {MyTask *task = new MyTask();task->setAutoDelete(true);  // 任务完成后自动释放task指向的内存threadPool->start(task);}threadPool->waitForDone();  // 等待所有任务执行完毕return 0;
}

结果：

Task running on thread: QThread(0xa947f68, name = "Thread (pooled)")
Task running on thread: QThread(0xa947de8, name = "Thread (pooled)")
Task running on thread: QThread(0xa947a68, name = "Thread (pooled)")
Task running on thread: QThread(0xa947c68, name = "Thread (pooled)")
Task running on thread: QThread(0xa947c68, name = "Thread (pooled)")
Task running on thread: QThread(0xa947de8, name = "Thread (pooled)")
Task running on thread: QThread(0xa947a68, name = "Thread (pooled)")
Task running on thread: QThread(0xa947f68, name = "Thread (pooled)")
Task running on thread: QThread(0xa947f68, name = "Thread (pooled)")
Task running on thread: QThread(0xa947c68, name = "Thread (pooled)")