int main()
{
ngx_qTest_t arr[5];
ngx_queue_t head;
ngx_queue_init(&head);
int i=0;
for( ; i<5; ++i)//初始化 队列
{
arr[i].key = i;
sprintf(arr[i].name, "\"My key is:%d.\"", arr[i].key);
if(i%2)
{
ngx_queue_insert_head(&head, &arr[i].link);
}
else
{
ngx_queue_insert_tail(&head, &arr[i].link);
}
}
printf("*******************************\n");
printf("Before sort:\n");
print_queue(&head);
ngx_queue_sort(&head, cmp);
printf("*******************************\n");
printf("After sort:\n");
print_queue(&head);
ngx_queue_t * midq = ngx_queue_middle(&head);
ngx_qTest_t *mid_data = ngx_queue_data(midq, ngx_qTest_t, link);
printf("*******************************\n");
// 求取中间节点
printf("%The middle key is %d.\n", mid_data->key);
return 0;
}
static ngx_http_location_tree_node_t *
ngx_http_create_locations_tree(ngx_conf_t *cf, ngx_queue_t *locations,
size_t prefix)
{
size_t len;
ngx_queue_t *q, tail;
ngx_http_location_queue_t *lq;
ngx_http_location_tree_node_t *node;
q = ngx_queue_middle(locations);
lq = (ngx_http_location_queue_t *) q;
len = lq->name->len - prefix;
node = ngx_palloc(cf->pool,
offsetof(ngx_http_location_tree_node_t, name) + len);
if (node == NULL) {
return NULL;
}
node->left = NULL;
node->right = NULL;
node->tree = NULL;
node->exact = lq->exact;
node->inclusive = lq->inclusive;
node->auto_redirect = (u_char) ((lq->exact && lq->exact->auto_redirect)
|| (lq->inclusive && lq->inclusive->auto_redirect));
node->len = (u_char) len;
ngx_memcpy(node->name, &lq->name->data[prefix], len);
ngx_queue_split(locations, q, &tail);
if (ngx_queue_empty(locations)) {
/*
* ngx_queue_split() insures that if left part is empty,
* then right one is empty too
*/
goto inclusive;
}
node->left = ngx_http_create_locations_tree(cf, locations, prefix);
if (node->left == NULL) {
return NULL;
}
ngx_queue_remove(q);
if (ngx_queue_empty(&tail)) {
goto inclusive;
}
node->right = ngx_http_create_locations_tree(cf, &tail, prefix);
if (node->right == NULL) {
return NULL;
}
inclusive:
if (ngx_queue_empty(&lq->list)) {
return node;
}
node->tree = ngx_http_create_locations_tree(cf, &lq->list, prefix + len);
if (node->tree == NULL) {
return NULL;
}
return node;
}