event.py 文件源码

def run(self):
        self.exc = None
        try:
            sysfs.edge(self._pin, self._trigger)
            initial_edge = True

            with sysfs.value_descriptor(self._pin) as fd:
                e = select.epoll()
                e.register(fd, EPOLLIN | EPOLLET | EPOLLPRI)
                try:
                    while not self._finished:
                        events = e.poll(0.1, maxevents=1)
                        if initial_edge:
                            initial_edge = False
                        elif len(events) > 0:
                            with self._lock:
                                self._event_detected = True
                                self.notify_callbacks()

                finally:
                    e.unregister(fd)
                    e.close()

        except BaseException as e:
            self.exc = e

        finally:
            sysfs.edge(self._pin, NONE)