How do I tell when Direct2D work has finished on the gpu

Question

The Direct2D API (i.e. EndDraw) executes asynchronously on the gpu. So how do I tell (on the cpu) that the work (on the gpu) is finished?

I'm hanging the device by calling IMFSinkWriter::WriteSample straight after I finish rendering ID2D1RenderTarget::EndDraw.

P.S. I'm going to try the ID3D11Fence api

• https://learn.microsoft.com/en-us/windows/win32/api/d3d11_3/nn-d3d11_3-id3d11fence
• https://learn.microsoft.com/en-us/windows/win32/api/d3d11_4/nf-d3d11_4-id3d11device5-createfence