well, printf calls vs_printf_r，but the vs_printf_r is the exactly same as in the original newlib...? as far as i know, there is no lock in the original lock~

I check the source code you provide, it seems no protect in printf when it comes to 2 cores printing at the same time? Am I missing something? Thanks

thank you for your answer by the way

sorry i'm feeling a little confused.. there should be means there is or there isnot..

I‘m sorry it's a little hard for me..
Is there any protection to prevent two core printting log at the same time to prevent disorder log，or do you suggest to use ESP_LOGI/ESP_LOGW...？ Thanks

Thanks!

Is it from the newlib, because I can't find the detailed function body?
I'v search the code and forum but have not get the conclusion.
sorry I don't know much about newlib， i'm learning