[Libusb-win32-devel] 40Hz mouse polling rate?

[Bob S. <m24...@ho...>]

I'm trying to use libusb to retrieve mouse input, and I've noticed that when 
using a loop containing usb_interrupt_read in the form of a separate thread, 
WM_TIMER, or brute force iterations, that the loop runs at 40Hz (40 mouse 
inputs per second). The only exception is when I use the asynchronous read 
API calls and use about 8 contexts, then getting a rate of about 90-110 
inputs per second. I noticed by using that hack of a method that the OS 
cursor was getting erratic, which suggests the OS is still fighting over the 
inputs for the device.

The questions I have are...
1. What's causing this 40Hz frequency instead of the expected 125Hz?
2. Is it possible to get libusb-win32 to have exclusive access over the 
device?