MINOR: queue: add queue_init() to initialize a queue

This is better and cleaner than open-coding this in the server and
proxy code, where it has all chances of becoming wrong once forgotten.

include/haproxy/queue.h

@@ -109,6 +109,13 @@ static inline int queue_limit_offset(int offset)
 	return offset;
 }
 
+static inline void queue_init(struct queue *queue)
+{
+	queue->head = EB_ROOT;
+	queue->length = 0;
+	queue->idx = 0;
+	HA_SPIN_INIT(&queue->lock);
+}
 
 #endif /* _HAPROXY_QUEUE_H */
 

src/proxy.c

@@ -1292,8 +1292,7 @@ void init_new_proxy(struct proxy *p)
 {
 	memset(p, 0, sizeof(struct proxy));
 	p->obj_type = OBJ_TYPE_PROXY;
-	p->queue.head = EB_ROOT;
+	queue_init(&p->queue);
-	HA_SPIN_INIT(&p->queue.lock);
 	LIST_INIT(&p->acl);
 	LIST_INIT(&p->http_req_rules);
 	LIST_INIT(&p->http_res_rules);

src/server.c

@@ -2160,8 +2160,7 @@ struct server *new_server(struct proxy *proxy)
 
 	srv->obj_type = OBJ_TYPE_SERVER;
 	srv->proxy = proxy;
-	srv->queue.head = EB_ROOT;
+	queue_init(&srv->queue);
-	HA_SPIN_INIT(&srv->queue.lock);
 	LIST_APPEND(&servers_list, &srv->global_list);
 	LIST_INIT(&srv->srv_rec_item);
 	LIST_INIT(&srv->ip_rec_item);