[riot-notifications] [RIOT-OS/RIOT] core: add irq_is_enabled() function to irq interface (#11117)

Hauke Petersen notifications at github.com
Thu Aug 19 09:11:26 CEST 2021

After some quick testing with native and cortex-m, I found that both behave differently when calling `irq_is_enabled()` from interrupt context. As there its not easy to say what the correct return value would be here, I decided to mark the function to be only valid in thread context for now. This should be the save way to go, and we can always relax/delete that warning if we figure out a platform independent behavior of what to return from interrupt context...

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