Transfer completion notifications are now send asynchronously this should
prevent potential lock of applications using a different thread for polling
events.
Fix interrupt tranfers, reported by and helped to debug, sebastia@
Other minor improvements and style fixes.
Tested by sebastia@ and ajacoutot@
ok ajacoutot@
libusb is a library for USB device access from userland.
Note that the OpenBSD backend based on ugen(4) does not provide
asynchronous I/O.
with tests, tweaks and ok ajacoutot@