Re: [Libusb-devel] poll_windows.c: Unable to cancel I/O that was started from another thread

[Peter S. <pe...@st...>]

Tim Roberts wrote:
> > I was very surprised to see that the code for cancelling a transfer
> > only seems to work completely on Vista and later, because of
> > CancelIoEx() availability there. Is there really no solution for XP?
> 
> Not out of the box.  If you have your own driver, you can add a custom
> ioctl to cancel all pending operations, but prior to Vista, you can
> only cancel I/O operations from the same thread they were issued.

The obvious solution would be to submit all io from one or more
libusb-internal threads. This would cost a small bit of overhead, but
maybe it would be tolerable in return for the API working right? How
expensive is life with threads in Windows?


//Peter