>I was kind of pointing out that people know that mutexes in ISRs are a bad idea, but don't know as much about the other dragons that live in the same swamp Ho

>I was kind of pointing out that people know that mutexes in ISRs are a bad idea, but don't know as much about the other dragons that live in the same swamp Honestly, these "people" seem like mythical creatures to me; I've certainly never met one. If you're qualified to write an ISR in C++, you're qualified to understand which parts of C++ are valid to use in an ISR and which aren't. This is a non-problem that does not appear in practice, even though it could in theory.