Printf out different threads on NUCLEO

[Juggler-5]

Hi. My Q is about best logging practices:
I`m using FREERTOS on STM32F429 nucleo board, running multiple threads along with mongoose. From mogoose related task I use essentially MG_INFO(), but what is best practice for logging out the other threads? I used simply printf(), but it messes with mongoose logs, for sure. Messes without any crashes, I admit. Is it safe (at least) to add #include "mongoose.h" to my other tasks and call MG_INFO() from there?

[scaprile]

Your problem is not a Mongoose problem, your question is not a Mongoose question, your problem is how to share a resource among different threads, and the fact that one of the users of that resource is Mongoose, is just anecdotic. Your problem is also your particular implementation of printf in the library you are using, and that does not depend on the board being NUCLEO or whatever, but on your choice of standard library (or IDE deciding that for you); based on your description, I guess newlib. but can't guess which flavor of it.
Mongoose log can be controlled with these: https://mongoose.ws/documentation/#logging . Basically, you can write your function to catch what is to be logged and send it wherever you want.
How to control your resources is beyond our realm
What would I do ? Use a semaphore, a mutex, a flag, a multi-threaded logging library, disable interrupts, tell the RTOS not to preemp you; a "printing thread" and a multiple producer single consumer queue, IPC, mailboxes; any other choice of sharing a resource between threads... Basically, you need to block others from using the resource when you have it. 'You' means the thread that is about to print. Basic resource management: check it is free, grab it, use it, free it.

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