Is it safe for multiple threads to call the same function?

Question

Is it safe to for example do:

void AddTwo(int &num)
{
  num +=2;
}


void ThreadProc(lpvoid arg)
{
AddTwo((int)arg);

}

Would it be saf

Answer 1

The safey depends on the value of lpvoid arg.

If All of the args are different each other, then safe otherwise not.

To make function call safe, Check out 'mutex'.