231     it->next = it->prev = 0;  in do_item_alloc()
262         chunk->prev = 0;  in do_item_alloc()
265         chunk->next->prev = chunk;  in do_item_alloc()
314     it->prev = 0;  in do_item_link_q()
316     if (it->next) it->next->prev = it;  in do_item_link_q()
336         assert(it->prev == 0);  in do_item_unlink_q()
341         *tail = it->prev;  in do_item_unlink_q()
344     assert(it->prev != it);  in do_item_unlink_q()
346     if (it->next) it->next->prev = it->prev;  in do_item_unlink_q()
347     if (it->prev) it->prev->next = it->next;  in do_item_unlink_q()
863         next_it = search->prev;  in lru_pull_tail()
1207     it->prev = *tail;  in crawler_link_q()
1209     if (it->prev) {  in crawler_link_q()
1210         assert(it->prev->next == 0);  in crawler_link_q()
1211         it->prev->next = it;  in crawler_link_q()
1224         assert(it->prev == 0);  in crawler_unlink_q()
1229         *tail = it->prev;  in crawler_unlink_q()
1232     assert(it->prev != it);  in crawler_unlink_q()
1234     if (it->next) it->next->prev = it->prev;  in crawler_unlink_q()
1235     if (it->prev) it->prev->next = it->next;  in crawler_unlink_q()
1249     if (it->prev == 0) {  in crawler_crawl_q()
1253             assert(it->next->prev == it);  in crawler_crawl_q()
1254             it->next->prev = 0;  in crawler_crawl_q()
1261     assert(it->prev != it);  in crawler_crawl_q()
1262     if (it->prev) {  in crawler_crawl_q()
1263         if (*head == it->prev) {  in crawler_crawl_q()
1269             *tail = it->prev;  in crawler_crawl_q()
1273             assert(it->prev->next == it);  in crawler_crawl_q()
1274             it->prev->next = it->next;  in crawler_crawl_q()
1275             it->next->prev = it->prev;  in crawler_crawl_q()
1278             it->prev->next = 0;  in crawler_crawl_q()
1281         it->next = it->prev;  in crawler_crawl_q()
1282         it->prev = it->next->prev;  in crawler_crawl_q()
1283         it->next->prev = it;  in crawler_crawl_q()
1285         if (it->prev) {  in crawler_crawl_q()
1286             it->prev->next = it;  in crawler_crawl_q()
1290     assert(it->prev != it);  in crawler_crawl_q()
1492             crawlers[sid].prev = 0;  in do_lru_crawler_start()