Bad performance

Hi,
many functions (e.g. Pin::set_direction, Pin::set_value, Pin::get_value, Pin::set_edge, Pin::get_poller) take longer than somebody would expect. Making them unsuitable for many tasks. The reason for the bad performance is that the sysfs-gpio-files direction,edge, and value are opened on demand and closed afterwards. This makes it impossible to read a sensor like the DHT22 (https://github.com/Filkolev/DHT22-sensor-driver) or performing any time critical operation. Whereas a C/C++/Python/... application would be able to do so.
Code example:

let pin = Pin::new(17);
pin.set_direction(Direction::Out);
pin.set_value(1);
[...]
pin.set_direction(Direction::In);
pin.set_edge(Edge::BothEdges);
let mut poller = pin.get_poller().unwrap();
// At this point I already have lost parts of the sensor reply
// if I use pin.get_value() I only receive 1/8 of the desired values
[...]

At the moment I don't see any way to fix this issue without breaking the API.
Any suggestions?

Best regards,
Bernd

Start with Pin::set_direction, set_value, get_value, set_edge, and get_poller, then trace how the sysfs GPIO direction, edge, and value files are opened and closed. Use the DHT22 timing example to assess the observed delay and determine what API behavior would be needed for time-critical reads without losing sensor events.