middle             19 core/ngx_queue.c     ngx_queue_t  *middle, *next;
middle             21 core/ngx_queue.c     middle = ngx_queue_head(queue);
middle             23 core/ngx_queue.c     if (middle == ngx_queue_last(queue)) {
middle             24 core/ngx_queue.c         return middle;
middle             30 core/ngx_queue.c         middle = ngx_queue_next(middle);
middle             35 core/ngx_queue.c             return middle;
middle             41 core/ngx_queue.c             return middle;