sk_wait_data (9) Linux Manual Page
sk_wait_data – wait for data to arrive at sk_receive_queue
Synopsis
int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb);Arguments
sk
-
- sock to wait on
timeo
- for how long
skb
- last skb seen on sk_receive_queue
Description
Now socket state including sk->sk_err is changed only under lock, hence we may omit checks after joining wait queue. We check receive queue before schedule only as optimization; it is very likely that release_sock added new data.