(private or global, with unwind where necessary), and remove the
remaining DEFER/ALLOWs. */
-#define SCM_DEFER_INTS do { } while (0);
+#define SCM_DEFER_INTS scm_rec_mutex_lock (&scm_i_defer_mutex);
-#define SCM_ALLOW_INTS do { } while (0);
+#define SCM_ALLOW_INTS scm_rec_mutex_unlock (&scm_i_defer_mutex);
#define SCM_REDEFER_INTS SCM_DEFER_INTS