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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - include/linux/lockref.h
1 #ifndef __LINUX_LOCKREF_H
2 #define __LINUX_LOCKREF_H
5 * Locked reference counts.
7 * These are different from just plain atomic refcounts in that they
8 * are atomic with respect to the spinlock that goes with them. In
9 * particular, there can be implementations that don't actually get
10 * the spinlock for the common decrement/increment operations, but they
11 * still have to check that the operation is done semantically as if
12 * the spinlock had been taken (using a cmpxchg operation that covers
13 * both the lock and the count word, or using memory transactions, for
17 #include <linux/spinlock.h>
24 extern void lockref_get(struct lockref
*);
25 extern int lockref_get_not_zero(struct lockref
*);
26 extern int lockref_get_or_lock(struct lockref
*);
27 extern int lockref_put_or_lock(struct lockref
*);
29 #endif /* __LINUX_LOCKREF_H */