1#ifndef _LINUX_FUTEX_H
2#define _LINUX_FUTEX_H
3
4#include <linux/compiler.h>
5#include <linux/types.h>
6
7
8
9
10#define FUTEX_WAIT 0
11#define FUTEX_WAKE 1
12#define FUTEX_FD 2
13#define FUTEX_REQUEUE 3
14#define FUTEX_CMP_REQUEUE 4
15#define FUTEX_WAKE_OP 5
16#define FUTEX_LOCK_PI 6
17#define FUTEX_UNLOCK_PI 7
18#define FUTEX_TRYLOCK_PI 8
19#define FUTEX_WAIT_BITSET 9
20#define FUTEX_WAKE_BITSET 10
21#define FUTEX_WAIT_REQUEUE_PI 11
22#define FUTEX_CMP_REQUEUE_PI 12
23
24#define FUTEX_PRIVATE_FLAG 128
25#define FUTEX_CLOCK_REALTIME 256
26#define FUTEX_CMD_MASK ~(FUTEX_PRIVATE_FLAG | FUTEX_CLOCK_REALTIME)
27
28#define FUTEX_WAIT_PRIVATE (FUTEX_WAIT | FUTEX_PRIVATE_FLAG)
29#define FUTEX_WAKE_PRIVATE (FUTEX_WAKE | FUTEX_PRIVATE_FLAG)
30#define FUTEX_REQUEUE_PRIVATE (FUTEX_REQUEUE | FUTEX_PRIVATE_FLAG)
31#define FUTEX_CMP_REQUEUE_PRIVATE (FUTEX_CMP_REQUEUE | FUTEX_PRIVATE_FLAG)
32#define FUTEX_WAKE_OP_PRIVATE (FUTEX_WAKE_OP | FUTEX_PRIVATE_FLAG)
33#define FUTEX_LOCK_PI_PRIVATE (FUTEX_LOCK_PI | FUTEX_PRIVATE_FLAG)
34#define FUTEX_UNLOCK_PI_PRIVATE (FUTEX_UNLOCK_PI | FUTEX_PRIVATE_FLAG)
35#define FUTEX_TRYLOCK_PI_PRIVATE (FUTEX_TRYLOCK_PI | FUTEX_PRIVATE_FLAG)
36#define FUTEX_WAIT_BITSET_PRIVATE (FUTEX_WAIT_BITSET | FUTEX_PRIVATE_FLAG)
37#define FUTEX_WAKE_BITSET_PRIVATE (FUTEX_WAKE_BITSET | FUTEX_PRIVATE_FLAG)
38#define FUTEX_WAIT_REQUEUE_PI_PRIVATE (FUTEX_WAIT_REQUEUE_PI | \
39 FUTEX_PRIVATE_FLAG)
40#define FUTEX_CMP_REQUEUE_PI_PRIVATE (FUTEX_CMP_REQUEUE_PI | \
41 FUTEX_PRIVATE_FLAG)
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57struct robust_list {
58 struct robust_list __user *next;
59};
60
61
62
63
64
65
66
67
68
69struct robust_list_head {
70
71
72
73 struct robust_list list;
74
75
76
77
78
79
80
81 long futex_offset;
82
83
84
85
86
87
88
89
90
91
92
93 struct robust_list __user *list_op_pending;
94};
95
96
97
98
99#define FUTEX_WAITERS 0x80000000
100
101
102
103
104
105
106
107#define FUTEX_OWNER_DIED 0x40000000
108
109
110
111
112#define FUTEX_TID_MASK 0x3fffffff
113
114
115
116
117
118#define ROBUST_LIST_LIMIT 2048
119
120
121
122
123
124#define FUTEX_BITSET_MATCH_ANY 0xffffffff
125
126#ifdef __KERNEL__
127struct inode;
128struct mm_struct;
129struct task_struct;
130union ktime;
131
132long do_futex(u32 __user *uaddr, int op, u32 val, union ktime *timeout,
133 u32 __user *uaddr2, u32 val2, u32 val3);
134
135extern int
136handle_futex_death(u32 __user *uaddr, struct task_struct *curr, int pi);
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153#define FUT_OFF_INODE 1
154#define FUT_OFF_MMSHARED 2
155
156union futex_key {
157 struct {
158 unsigned long pgoff;
159 struct inode *inode;
160 int offset;
161 } shared;
162 struct {
163 unsigned long address;
164 struct mm_struct *mm;
165 int offset;
166 } private;
167 struct {
168 unsigned long word;
169 void *ptr;
170 int offset;
171 } both;
172};
173
174#define FUTEX_KEY_INIT (union futex_key) { .both = { .ptr = NULL } }
175
176#ifdef CONFIG_FUTEX
177extern void exit_robust_list(struct task_struct *curr);
178extern void exit_pi_state_list(struct task_struct *curr);
179extern int futex_cmpxchg_enabled;
180#else
181static inline void exit_robust_list(struct task_struct *curr)
182{
183}
184static inline void exit_pi_state_list(struct task_struct *curr)
185{
186}
187#endif
188#endif
189
190#define FUTEX_OP_SET 0
191#define FUTEX_OP_ADD 1
192#define FUTEX_OP_OR 2
193#define FUTEX_OP_ANDN 3
194#define FUTEX_OP_XOR 4
195
196#define FUTEX_OP_OPARG_SHIFT 8
197
198#define FUTEX_OP_CMP_EQ 0
199#define FUTEX_OP_CMP_NE 1
200#define FUTEX_OP_CMP_LT 2
201#define FUTEX_OP_CMP_LE 3
202#define FUTEX_OP_CMP_GT 4
203#define FUTEX_OP_CMP_GE 5
204
205
206
207
208
209
210
211#define FUTEX_OP(op, oparg, cmp, cmparg) \
212 (((op & 0xf) << 28) | ((cmp & 0xf) << 24) \
213 | ((oparg & 0xfff) << 12) | (cmparg & 0xfff))
214
215#endif
216