The hotplug thread writes a message to an internal hotplug file descriptor.
This message is read by the thread that calls libusb_handle_events() which then
call the callback. The callback is never made by the hotplug thread.
---
Reply to this email directly or view it on GitHub:
https://github.com/libusbx/libusbx/issues/158#issuecomment-28008449
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