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[INET]: Generalise the tcp_listen_ lock routines

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Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnaldo Carvalho de Melo
2005-08-09 20:08:09 -07:00
committed by David S. Miller
parent 6e04e02165
commit f3f05f7046
6 changed files with 94 additions and 87 deletions
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21
include/net/tcp.h
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@@ -1447,27 +1447,6 @@ static __inline__ void tcp_openreq_init(struct request_sock *req,
extern void tcp_enter_memory_pressure(void);
extern void tcp_listen_wlock(void);
/* - We may sleep inside this lock.
* - If sleeping is not required (or called from BH),
* use plain read_(un)lock(&inet_hashinfo.lhash_lock).
*/
static inline void tcp_listen_lock(void)
{
/* read_lock synchronizes to candidates to writers */
read_lock(&tcp_hashinfo.lhash_lock);
atomic_inc(&tcp_hashinfo.lhash_users);
read_unlock(&tcp_hashinfo.lhash_lock);
}
static inline void tcp_listen_unlock(void)
{
if (atomic_dec_and_test(&tcp_hashinfo.lhash_users))
wake_up(&tcp_hashinfo.lhash_wait);
}
static inline int keepalive_intvl_when(const struct tcp_sock *tp)
{
return tp->keepalive_intvl ? : sysctl_tcp_keepalive_intvl;