-
-/* The strategy is: modifications net_family vector are short, do not
- sleep and veeery rare, but read access should be free of any exclusive
- locks.
- */
-
-static void net_family_write_lock(void)
-{
- spin_lock(&net_family_lock);
- while (atomic_read(&net_family_lockct) != 0) {
- spin_unlock(&net_family_lock);
-
- yield();
-
- spin_lock(&net_family_lock);
- }
-}
-
-static __inline__ void net_family_write_unlock(void)
-{
- spin_unlock(&net_family_lock);
-}
-
-static __inline__ void net_family_read_lock(void)
-{
- atomic_inc(&net_family_lockct);
- spin_unlock_wait(&net_family_lock);
-}
-
-static __inline__ void net_family_read_unlock(void)
-{
- atomic_dec(&net_family_lockct);
-}
-
-#else
-#define net_family_write_lock() do { } while(0)
-#define net_family_write_unlock() do { } while(0)
-#define net_family_read_lock() do { } while(0)
-#define net_family_read_unlock() do { } while(0)
-#endif