[riot-notifications] [RIOT-OS/RIOT] ztimer: add ztimer_is_set() to user API (#15780)

Hauke Petersen notifications at github.com
Fri Jan 15 14:49:11 CET 2021

### Contribution description
To improve the low power support I am currently porting NimBLE to use `ztimer` as RIOT timer backend. Mapping the `ztimer` API works mostly flawless, the only thing missing is a `is_set()` function. The current implementation uses an ugly hack by using xtimer internal struct members to do this check -> so for the improved port I'd like to have this less error prone :-)

This PR simply exposes `ztimer`s internal `_is_set()` function by wrapping it into a critical section inside a newly added `ztimer_is_set()` user API function. Should be pretty straight forward.

### Testing procedure
I added a call to the new `ztimer_is_set()` function in `tests/ztimer_periodic`. So simply run `tests/ztimer_periodic` on any platform -> it should succeed as expected.

### Issues/PRs references
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-- Commit Summary --

  * ztimer: expose ztimer_is_set() to public API
  * tests/ztimer_periodic: add call to ztimer_is_set()

-- File Changes --

    M sys/include/ztimer.h (11)
    M sys/ztimer/core.c (8)
    M tests/ztimer_periodic/main.c (5)

-- Patch Links --


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