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;