Hi,
with https://github.com/RIOT-OS/RIOT/pull/9530 being merged the API of xtimer changed a bit. Before, one could check if an xtimer is set by deactivating the IRQ, checking if its members `target` and `long_target` were 0 and reactivating the IRQ (as was done in the xtimer-internal function `_is_set()` basically did as well).
Given that with the changes #9530 neither the members `target` and `long_target` nor the internal function `_is_set()` exist now, how does one check outside of the xtimer module, given an `xtimer_t` `a` that `a` is armed?
I used the previous method in https://github.com/RIOT-OS/RIOT/pull/12648 to check if the inter-frame timer was set and only set it if that was not the case (otherwise my schedule gets messed up). As a workaround I use an external global boolean for now that is set whenever the timer is set and unset whenever the timer event is handled. I fear however, that this could lead to a race condition, so an intrinsic method to xtimer to determine if it is set would be preferred.
Best regards, Martine