DXSample | Sample Program for DirectX 12 Swift | Math library

You are calling the pSample->Resize() function, passing the returned value to the CreateFunction as the function to run.

If you want the Resize function to be run in its own thread there are two things you need to do:

1. Pass a pointer to the function instead, e.g. &HelloTexture::Resize.
2. Make the function static.

The first point is about passing a pointer to the function itself to CreateThread, who will create the thread and call the function from the new thread.

The second point is because non-static member function needs an object, an instance of the class to be called on.

There are also another problem with the code you have. Remember that threads are running parallel to each other. If you create a thread it will run independently from other threads. That means the object you use, and all its data, must be kept alive until the end of the thread.

I'm bringing this up because you seemingly want to create the thread, and then immediately call pSample->Destroy() which is like pulling the rug out from under some other persons feet.

Do you really want to create a thread here?