51   uint32_t refs;      // References, including cache reference, if present.  member
215     assert(e->refs == 1);  // Invariant of lru_ list.  in ~LRUCache()
222   if (e->refs == 1 && e->in_cache) {  // If on lru_ list, move to in_use_ list.  in Ref()
226   e->refs++;  in Ref()
230   assert(e->refs > 0);  in Unref()
231   e->refs--;  in Unref()
232   if (e->refs == 0) { // Deallocate.  in Unref()
236   } else if (e->in_cache && e->refs == 1) {  // No longer in use; move to lru_ list.  in Unref()
282   e->refs = 1;  // for the returned handle.  in Insert()
286     e->refs++;  // for the cache's reference.  in Insert()
295     assert(old->refs == 1);  in Insert()
327     assert(e->refs == 1);  in Prune()