libudev queue finished seqnums

[Sebastian Wiesner <lunaryorn@xxxxxxxxxxxxxx>]

Hello,

I've got a question about libudev, concerning the function
"udev_queue_get_seqnum_is_finished()".  According to the
documentation, it returns a flag, indicating whether the given
sequence number has already been processed.  In my experiments
however, I found this function to always return 1, even for sequence
numbers which haven't ocurred yet.  The attached test program gives
the following output on my system:

$ ./udev_queue_sequence_numbers
current seqnum: 1662
is previous seqnum finished? yes
is current seqnum finished? yes
is next seqnum finished? yes

In my understanding, the last line should have said "no", because the
number immediately folllowing the current sequence number has
obviously not yet occurred.

Am I missing something?

Thanks for your help,
Sebastian Wiesner

#include <libudev.h>
#include <stdio.h>
#include <assert.h>

int main(int argc, char *argv[]) {
  struct udev *context = udev_new();
  assert(context);
  struct udev_queue *queue = udev_queue_new(context);
  assert(queue);
  unsigned long long int current_seqnum = udev_queue_get_udev_seqnum(queue);
  int is_current_finished = udev_queue_get_seqnum_is_finished(
      queue, current_seqnum);
  int is_previous_finished = udev_queue_get_seqnum_is_finished(
      queue, current_seqnum - 1l);
  int is_next_finished = udev_queue_get_seqnum_is_finished(
      queue, current_seqnum + 1l);
  printf("current seqnum: %llu\n", current_seqnum);
  printf("is previous seqnum finished? %s\n", is_previous_finished?
          "yes": "no");
  printf("is current seqnum finished? %s\n", is_current_finished? "yes": "no");
  printf("is next seqnum finished? %s\n", is_next_finished? "yes": "no");
  return 0;
}