rust-sysfs-gpio

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Similar libraries for GPIO support in other languages (Python RPi.GPIO, WiringPi, etc), provide a background thread for interrupt detection, and callback attaching. For example in python:

RPi.GPIO runs a second thread for callback functions. This means that callback functions can be run at the same time as your main program, in immediate response to an edge. For example:

def my_callback(channel):
    print('This is a edge event callback function!')
    print('Edge detected on channel %s'%channel)
    print('This is run in a different thread to your main program')

GPIO.add_event_detect(channel, GPIO.RISING, callback=my_callback)  # add rising edge detection

I know this is difficult to do in Rust with all the safety, ownership and the like, but that will be great to have.

This wouldn't be too difficult with a thread, but that involves a thread, of course. There have been discussions about integration the Gpio poll functionality with mio or other async frameworks, although that is a somewhat different concern than a easy-to-use callback interface.

Looking at RPi.GPIO, they use a thread.