event_periodic_callback: add event_periodic_callback_oneshot()

[benpicco]

Contribution description

Often there is a need to execute an event once after a delay.
This adds a convenience helper function for it.

Testing procedure

A test for the new function has been added to tests/sys/event_periodic_callback

Issues/PRs references

[riot-ci]

Murdock results

✔️ PASSED

bef6232 tests/event_periodic_callback: add test for oneshot event

Success	Failures	Total	Runtime
10196	0	10197	15m:10s

Artifacts

• Documentation preview

[mguetschow]

I'm not too familiar with the details of the different event queue APIs, but the naming event_periodic_callback_onshot() sounds confusing. I would expect to be an event either periodic or oneshot :P

[kfessel]

I'm not too familiar with the details of the different event queue APIs, but the naming event_periodic_callback_onshot() sounds confusing. I would expect to be an event either periodic or oneshot :P

I would not expect a periodic event to count but somehow it does looks a bit going a egg-laying-wool-milk-pig attempt to events which are not events but tasks that are parsed by workers named event threads

I think the naming of and the actual implementation is quiet fitting