how to release the memory in QtConcurrent the new thread func?

[opengpu2]

QtConcurrent::run(func, p);

before the main()
@
void func(pointer* p)
{
Class* xxx = new Class();
while (true)
{
xxx->tick();
}
delete xxx;
return;
}
@

1. what should i do when i close the app, eg.teminate this new thread, but how?
2. can delete xxx; implement? will the memory leak in this way? if it does leak, what should i modify the code above?

thank you

[napajejenunedk0]

You will always leak in your case, I presume. First off I would suggest you to use QScopedPointer, not delete. Second, when quitting your application you should wait for all futures to finish and then quit. The line:

QtConcurrent::run(func, p);

... generates QFuture< void > object. One way is to wait the future to finish either using QFuture< T >::waitForFinished() or better off by using a QFutureWatcher which would asynchronously notify you when the future is ready. You could also cancel the future upon a request to quit the application.
So the steps are:

1. Set QGuiApplication::setQuitOnLastWindowClosed( false ) so that to prevent the application from quitting immediately after the last of its windows is closed.
2. Connect a slot to the QGuiApplication::lastWindowClosed() signal.
3. Create a QFutureWatcher< void >* (using new) for every QFuture< void > you create using QtConcurrent::run and keep the instances of the future watchers in the object which receives the last window closed notification.
4. Hook to the finished() signal of the QFutureWatcher< void > in the object which also tracks whether application quit has been requested. Remove the kept instance of the QFutureWatcher
5. Upon receiving the last window closed notification set a flag in the same object that an application quit has been requested - the last window has been closed.
6. On each QFutureWatcher< void >::finished() and on QGuiApplication::lastWindowClosed() check if there are no cached QFutureWatcher's e.g. no futures are running.