In py/, must guard uses of RUN_BACKGROUND_TASKS

Author: jepler

py/obj.c

@@ -63,7 +63,9 @@ const char *mp_obj_get_type_str(mp_const_obj_t o_in) {
 void mp_obj_print_helper(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
     // There can be data structures nested too deep, or just recursive
     MP_STACK_CHECK();
+    #ifdef RUN_BACKGROUND_TASKS
     RUN_BACKGROUND_TASKS;
+    #endif
 #ifndef NDEBUG
     if (o_in == MP_OBJ_NULL) {
         mp_print_str(print, "(nil)");

py/stream.c

@@ -341,7 +341,9 @@ STATIC mp_obj_t stream_readall(mp_obj_t self_in) {
             p = vstr_extend(&vstr, DEFAULT_BUFFER_SIZE);
             current_read = DEFAULT_BUFFER_SIZE;
         }
+        #ifdef RUN_BACKGROUND_TASKS
         RUN_BACKGROUND_TASKS;
+        #endif
     }
 
     vstr.len = total_size;