__nisdb_assert_wheld
if ((lc = __nisdb_assert_wheld(&lvar ## _rwlock)) != 0) { \
return (__nisdb_assert_wheld(rw));
#define ASSERTWHELD(var) if (__nisdb_assert_wheld(&var ## _rwlock) \
extern int __nisdb_assert_wheld(__nisdb_rwlock_t *);