1 #ifndef __LINUX_OSQ_LOCK_H
2 #define __LINUX_OSQ_LOCK_H
5 * An MCS like lock especially tailored for optimistic spinning for sleeping
6 * lock implementations (mutex, rwsem, etc).
8 struct optimistic_spin_node
{
9 struct optimistic_spin_node
*next
, *prev
;
10 int locked
; /* 1 if lock acquired */
11 int cpu
; /* encoded CPU # + 1 value */
14 struct optimistic_spin_queue
{
16 * Stores an encoded value of the CPU # of the tail node in the queue.
17 * If the queue is empty, then it's set to OSQ_UNLOCKED_VAL.
22 #define OSQ_UNLOCKED_VAL (0)
24 /* Init macro and function. */
25 #define OSQ_LOCK_UNLOCKED { ATOMIC_INIT(OSQ_UNLOCKED_VAL) }
27 static inline void osq_lock_init(struct optimistic_spin_queue
*lock
)
29 atomic_set(&lock
->tail
, OSQ_UNLOCKED_VAL
);
32 extern bool osq_lock(struct optimistic_spin_queue
*lock
);
33 extern void osq_unlock(struct optimistic_spin_queue
*lock
);
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