#ifndef _LINUX_FUTEX_H
#define _LINUX_FUTEX_H

#include <linux/compiler.h>
#include <linux/types.h>



#define FUTEX_WAIT		0
#define FUTEX_WAKE		1
#define FUTEX_FD		2
#define FUTEX_REQUEUE		3
#define FUTEX_CMP_REQUEUE	4
#define FUTEX_WAKE_OP		5
#define FUTEX_LOCK_PI		6
#define FUTEX_UNLOCK_PI		7
#define FUTEX_TRYLOCK_PI	8
#define FUTEX_WAIT_BITSET	9
#define FUTEX_WAKE_BITSET	10
#define FUTEX_WAIT_REQUEUE_PI	11
#define FUTEX_CMP_REQUEUE_PI	12

#define FUTEX_PRIVATE_FLAG	128
#define FUTEX_CLOCK_REALTIME	256
#define FUTEX_CMD_MASK		~(FUTEX_PRIVATE_FLAG | FUTEX_CLOCK_REALTIME)

#define FUTEX_WAIT_PRIVATE	(FUTEX_WAIT | FUTEX_PRIVATE_FLAG)
#define FUTEX_WAKE_PRIVATE	(FUTEX_WAKE | FUTEX_PRIVATE_FLAG)
#define FUTEX_REQUEUE_PRIVATE	(FUTEX_REQUEUE | FUTEX_PRIVATE_FLAG)
#define FUTEX_CMP_REQUEUE_PRIVATE (FUTEX_CMP_REQUEUE | FUTEX_PRIVATE_FLAG)
#define FUTEX_WAKE_OP_PRIVATE	(FUTEX_WAKE_OP | FUTEX_PRIVATE_FLAG)
#define FUTEX_LOCK_PI_PRIVATE	(FUTEX_LOCK_PI | FUTEX_PRIVATE_FLAG)
#define FUTEX_UNLOCK_PI_PRIVATE	(FUTEX_UNLOCK_PI | FUTEX_PRIVATE_FLAG)
#define FUTEX_TRYLOCK_PI_PRIVATE (FUTEX_TRYLOCK_PI | FUTEX_PRIVATE_FLAG)
#define FUTEX_WAIT_BITSET_PRIVATE	(FUTEX_WAIT_BITSET | FUTEX_PRIVATE_FLAG)
#define FUTEX_WAKE_BITSET_PRIVATE	(FUTEX_WAKE_BITSET | FUTEX_PRIVATE_FLAG)
#define FUTEX_WAIT_REQUEUE_PI_PRIVATE	(FUTEX_WAIT_REQUEUE_PI | \
					 FUTEX_PRIVATE_FLAG)
#define FUTEX_CMP_REQUEUE_PI_PRIVATE	(FUTEX_CMP_REQUEUE_PI | \
					 FUTEX_PRIVATE_FLAG)


struct robust_list {
	struct robust_list __user *next;
};

struct robust_list_head {
	struct robust_list list;

	long futex_offset;

	struct robust_list __user *list_op_pending;
};

#define FUTEX_WAITERS		0x80000000

#define FUTEX_OWNER_DIED	0x40000000

#define FUTEX_TID_MASK		0x3fffffff

#define ROBUST_LIST_LIMIT	2048

#define FUTEX_BITSET_MATCH_ANY	0xffffffff

#ifdef __KERNEL__
struct inode;
struct mm_struct;
struct task_struct;
union ktime;

long do_futex(u32 __user *uaddr, int op, u32 val, union ktime *timeout,
	      u32 __user *uaddr2, u32 val2, u32 val3);

extern int
handle_futex_death(u32 __user *uaddr, struct task_struct *curr, int pi);


#define FUT_OFF_INODE    1 
#define FUT_OFF_MMSHARED 2 

union futex_key {
	struct {
		unsigned long pgoff;
		struct inode *inode;
		int offset;
	} shared;
	struct {
		unsigned long address;
		struct mm_struct *mm;
		int offset;
	} private;
	struct {
		unsigned long word;
		void *ptr;
		int offset;
	} both;
};

#define FUTEX_KEY_INIT (union futex_key) { .both = { .ptr = NULL } }

#ifdef CONFIG_FUTEX
extern void exit_robust_list(struct task_struct *curr);
extern void exit_pi_state_list(struct task_struct *curr);
extern int futex_cmpxchg_enabled;
#else
static inline void exit_robust_list(struct task_struct *curr)
{
}
static inline void exit_pi_state_list(struct task_struct *curr)
{
}
#endif
#endif 

#define FUTEX_OP_SET		0	
#define FUTEX_OP_ADD		1	
#define FUTEX_OP_OR		2	
#define FUTEX_OP_ANDN		3	
#define FUTEX_OP_XOR		4	

#define FUTEX_OP_OPARG_SHIFT	8	

#define FUTEX_OP_CMP_EQ		0	
#define FUTEX_OP_CMP_NE		1	
#define FUTEX_OP_CMP_LT		2	
#define FUTEX_OP_CMP_LE		3	
#define FUTEX_OP_CMP_GT		4	
#define FUTEX_OP_CMP_GE		5	


#define FUTEX_OP(op, oparg, cmp, cmparg) \
  (((op & 0xf) << 28) | ((cmp & 0xf) << 24)		\
   | ((oparg & 0xfff) << 12) | (cmparg & 0xfff))

#endif