esp_execute_shared_stack_function thread safety

[jdoubleu]

I was wondering whether I could call esp_execute_shared_stack_function from multiple tasks. Looking at the implementation, the function doesn't seem to be thread safe. Mainly because it uses global static variables (e.g. xtensa_shared_stack_callback). Although I have to pass a mutex, this is only used to guard access to the stack memory also provided.

[ESP_Sprite]

Yeah, that looks like a bug, good catch. I'll file an internal issue.

[jdoubleu]

Thanks for the quick reply!

Please note the open issue on GitHub, which is also affected by the function, but not related to my issue: https://github.com/espressif/esp-idf/issues/10414.

While I'm at it: it would be really nice if I could pass void* arg to esp_execute_shared_stack_function, so that my callback receives the void* arg when called on the external stack.