is pointer assignment always atomic?

Is pointer assignment always atomic?

Will this always work:


struct list {
  int n;
  struct list* next;
};

struct stack {
  struct list* top;
};

thread one does:
for(;;) {
  print_list(stack->top);
  // read after write race condition for stack->top.
}

thread two does:
for(int count = 0; true; count++) {
  stack->top = new_int_list(count, stack->top);
}

Will the assignments and reads to stack->top always be atomic? Will the pointer value ever be half written or something, on some architecture?

OP, I'm fucking uneducated piece of shit. But at school they told me that reading/writing integers on x86 is atomic.