[英]Cross-platform issues or what is the alternative to QtConcurrent :: run?
我需要在单独的线程中异步运行 function,当我测试 windows 时,我使用QtConcurrent:: run
一切正常,但是一旦我在 ZE206A54E97690CCE50CC872 上运行相同的代码,它就开始同步运行。896 使用 qt4.8 和 c++98:c
可测试代码:
void myRunFunction(QString name)
{
for(int i = 0; i <= 1000; i++)
qDebug() << name << " " << i << "from" << QThread::currentThread();
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QFuture<void> t1 = QtConcurrent::run(myRunFunction, QString("A"));
QFuture<void> t2 = QtConcurrent::run(myRunFunction, QString("B"));
QFuture<void> t3 = QtConcurrent::run(myRunFunction, QString("C"));
t1.waitForFinished();
t2.waitForFinished();
t3.waitForFinished();
return a.exec();
}
我在控制台中得到的:
"A" 0 from QThread (0x11a78f8, name = "Thread (pooled)")
...
"A" 1000 from QThread (0x11a78f8, name = "Thread (pooled)")
after
"B" 0 from QThread (0x11a78f8, name = "Thread (pooled)")
...
"B" 1000 from QThread (0x11a78f8, name = "Thread (pooled)")
etc
告诉我如何解决这个问题,或者你还能尝试什么? 我想尝试QtConcurrent::run(QThreadPool *pool, Function function, ...)但 qt4.8 没有
根据评论,由于对 VM 施加的限制,全局QThreadPool
实例中的线程数可能默认限制为单个线程。
为了解决这个问题,您可以简单地使用显式设置线程数...
QThreadPool::globalInstance()->setMaxThreadCount(4);
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