Using std::deque inside USBSerial IRQHandler read function

[jdinh1 (Jonathan Dinh)]

I’m using the the non RTOS version of USBSerial class for a personal project of mine.

My question is that is it safe to use the std::deque library and some of its methods (push_back, pop, etc…) inside the USBSerial IRQHandler read function?

I’ve been running it for a couple days now and everything seems to be OK. But according to a few people, dynamic memory allocation inside IRQ handlers will eventually cause hardfaults down the road, and the deque library from the STL does just that behind the scene.

[breda (a breda)]

It is possible to provide your own memory allocator with stl containers.

https://en.cppreference.com/w/cpp/memory/allocator

CppCon 2017: Bob Steagall “How to Write a Custom Allocator”