C++ QThread线程池
我正在尝试用QThread编写线程轮询C++ QThread线程池,c++,qt,threadpool,C++,Qt,Threadpool,我正在尝试用QThread编写线程轮询 class ThreadPool: public QObject { Q_OBJECT public: ThreadPool(int maxThreads); void addTask(MyTask *task); private: int maxThreads; QMutex mutex; QVector<QPair<bool, QThread>> threads; QTh
class ThreadPool: public QObject
{
Q_OBJECT
public:
ThreadPool(int maxThreads);
void addTask(MyTask *task);
private:
int maxThreads;
QMutex mutex;
QVector<QPair<bool, QThread>> threads;
QThread *getFreeThread();
public slots:
void freeThread();
};
void ThreadPool::addTask(MyTask* task)
{
QThread *thread = getFreeThread();
task->moveToThread(thread);
connect(thread, SIGNAL(started()), task, SLOT(doWork()));
connect(task, SIGNAL(workFinished()), thread, SLOT(quit()));
connect(thread, SIGNAL(finished()), task, SLOT(deleteLater()));
connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));
connect(thread, SIGNAL(finished()), this, SLOT(freeThread()));
thread->start();
}
类线程池:公共QObject
{
Q_对象
公众:
线程池(int-maxThreads);
void addTask(MyTask*task);
私人:
int最大线程;
QMutex互斥;
QVector线程;
QThread*getFreeThread();
公众时段:
void freeThread();
};
void ThreadPool::addTask(MyTask*task)
{
QThread*thread=getFreeThread();
任务->移动到线程(线程);
连接(线程、信号(已启动())、任务、插槽(doWork());
连接(任务、信号(workFinished())、线程、插槽(quit());
连接(线程、信号(finished())、任务、插槽(deleteLater());
连接(线程、信号(finished())、线程、插槽(deleteLater());
连接(线程,信号(finished()),此,插槽(freeThread());
线程->开始();
}
我正在创建数量有限的线程来执行任务。
但是,我不明白如何获得释放线程的数量。
我知道QThreadPool和Qtconcurrent,但我不想使用它。
也许,值得注意的是,QPair向量中的每个线程是否是自由的
QVector
来跟踪池中的所有线程,而是使用QList
只保存指向空闲线程的指针
private:
QList<QThread*> freeThreads; // only free threads
QList<QThread*> allThreads; // just to count the number of all threads
QVector
来跟踪池中的所有线程,而是使用QList
只保存指向空闲线程的指针
private:
QList<QThread*> freeThreads; // only free threads
QList<QThread*> allThreads; // just to count the number of all threads
为了完整性起见,存在一个可以使用的QThreadPool类。为了完整性起见,存在一个可以使用的QThreadPool类。
QThread* getFreeThread()
{
if( ! freeThreads.isEmpty() )
{
// take the first free thread
return freeThreads.takeFirst();
}
else
{
if(allThreads.size() < maxThreads )
{
// create a new thread
QThread* thread = new QThread(this);
allThreads << thread;
return thread;
}
else
{
// Maximum number of threads exceeded
// and no free thread is available
return NULL;
}
}
}
void ThreadPool::addTask(MyTask* task)
{
QThread *thread = getFreeThread();
if( ! thread )
{
// do something else
return;
}
// proceed with thread execution ...
}