Question

I really don’t have a clue how to give this question a good title – sorry for that.

Just to know what’s the goal of all this: pass a uint8_t variable pointer to bar() which does set it to 1 or 0, that I can check it’s state inside my main. I do need zbar(), it’s a thread and it does actually setting the value to 1 or 0

So I have somewhere:

struct foo_t {
    ...
    uint8_t *state;
};

and in main I go with:

int main(void) {
     uint8_t state = 0;
     bar(&state);

     while(1) {
          if(state)
              //do something here
     }
}

and here we have somewhere else in another sourcefile.

void bar(uint8_t *state) {
    struct foo_t *foo;    //using malloc here - don't worry

    foo->state = state;

    zbar(foo); 

}

void zbar(struct foo_t *arg) {
    if(condition)
       arg->state = 1;
    else
       arg->state = 0;
 }

How to make this working? o0
zBar can actually access the arg struct, that’s not the problem at all.

Please don’t worry why I do it so strange, it’s used within threads etc.

Answer 1

I assume you meant void bar(uint8_t* state)?

It does not do what I think you intended. Again I assume you want the state variable in main to be changed? If so try

struct foo_t {
    uint8_t* state; // changed this to a pointer type.
}

void bar(uint8_t* state) {
    struct foo_t *foo = blah blah;
    foo->state = state;
    zbar(foo);
}

void zbar(foo_t* arg) {
   if (condition)
       *(arg->state) = 1;
   else
       *(arg->state) = 0;
}

I tihnk this is what you’re trying to do