简单 rcu 使用示例

sisi8408

1. 
   
2. static struct list_head xfrm_km_list = LIST_HEAD_INIT(xfrm_km_list);
   
3. static DEFINE_RWLOCK(xfrm_km_lock);
   
4. 
   
5. void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
   
6. {
   
7.         struct xfrm_mgr *km;
   
8. 
   
9.         //read_lock(&xfrm_km_lock);
   
10.         rcu_read_lock();
    
11.         //list_for_each_entry(km, &xfrm_km_list, list)
    
12.         list_for_each_entry_rcu(km, &xfrm_km_list, list)
    
13.                 if (km->notify_policy)
    
14.                         km->notify_policy(xp, dir, c);
    
15.         //read_unlock(&xfrm_km_lock);
    
16.         rcu_read_unlock();
    
17. }
    
18. 
    
19. //int xfrm_register_km(struct xfrm_mgr *km)
    
20. void xfrm_register_km(struct xfrm_mgr *km)
    
21. {
    
22.         write_lock_bh(&xfrm_km_lock);
    
23.         //list_add_tail(&km->list, &xfrm_km_list);
    
24.         list_add_tail_rcu(&km->list, &xfrm_km_list);
    
25.         write_unlock_bh(&xfrm_km_lock);
    
26.         //return 0;
    
27. }
    

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