Root/
1 | #ifndef _LINUX_FUTEX_H |
2 | #define _LINUX_FUTEX_H |
3 | |
4 | #include <linux/compiler.h> |
5 | #include <linux/types.h> |
6 | |
7 | /* Second argument to futex syscall */ |
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 | * Support for robust futexes: the kernel cleans up held futexes at |
45 | * thread exit time. |
46 | */ |
47 | |
48 | /* |
49 | * Per-lock list entry - embedded in user-space locks, somewhere close |
50 | * to the futex field. (Note: user-space uses a double-linked list to |
51 | * achieve O(1) list add and remove, but the kernel only needs to know |
52 | * about the forward link) |
53 | * |
54 | * NOTE: this structure is part of the syscall ABI, and must not be |
55 | * changed. |
56 | */ |
57 | struct robust_list { |
58 | struct robust_list __user *next; |
59 | }; |
60 | |
61 | /* |
62 | * Per-thread list head: |
63 | * |
64 | * NOTE: this structure is part of the syscall ABI, and must only be |
65 | * changed if the change is first communicated with the glibc folks. |
66 | * (When an incompatible change is done, we'll increase the structure |
67 | * size, which glibc will detect) |
68 | */ |
69 | struct robust_list_head { |
70 | /* |
71 | * The head of the list. Points back to itself if empty: |
72 | */ |
73 | struct robust_list list; |
74 | |
75 | /* |
76 | * This relative offset is set by user-space, it gives the kernel |
77 | * the relative position of the futex field to examine. This way |
78 | * we keep userspace flexible, to freely shape its data-structure, |
79 | * without hardcoding any particular offset into the kernel: |
80 | */ |
81 | long futex_offset; |
82 | |
83 | /* |
84 | * The death of the thread may race with userspace setting |
85 | * up a lock's links. So to handle this race, userspace first |
86 | * sets this field to the address of the to-be-taken lock, |
87 | * then does the lock acquire, and then adds itself to the |
88 | * list, and then clears this field. Hence the kernel will |
89 | * always have full knowledge of all locks that the thread |
90 | * _might_ have taken. We check the owner TID in any case, |
91 | * so only truly owned locks will be handled. |
92 | */ |
93 | struct robust_list __user *list_op_pending; |
94 | }; |
95 | |
96 | /* |
97 | * Are there any waiters for this robust futex: |
98 | */ |
99 | #define FUTEX_WAITERS 0x80000000 |
100 | |
101 | /* |
102 | * The kernel signals via this bit that a thread holding a futex |
103 | * has exited without unlocking the futex. The kernel also does |
104 | * a FUTEX_WAKE on such futexes, after setting the bit, to wake |
105 | * up any possible waiters: |
106 | */ |
107 | #define FUTEX_OWNER_DIED 0x40000000 |
108 | |
109 | /* |
110 | * The rest of the robust-futex field is for the TID: |
111 | */ |
112 | #define FUTEX_TID_MASK 0x3fffffff |
113 | |
114 | /* |
115 | * This limit protects against a deliberately circular list. |
116 | * (Not worth introducing an rlimit for it) |
117 | */ |
118 | #define ROBUST_LIST_LIMIT 2048 |
119 | |
120 | /* |
121 | * bitset with all bits set for the FUTEX_xxx_BITSET OPs to request a |
122 | * match of any bit. |
123 | */ |
124 | #define FUTEX_BITSET_MATCH_ANY 0xffffffff |
125 | |
126 | #ifdef __KERNEL__ |
127 | struct inode; |
128 | struct mm_struct; |
129 | struct task_struct; |
130 | union ktime; |
131 | |
132 | long do_futex(u32 __user *uaddr, int op, u32 val, union ktime *timeout, |
133 | u32 __user *uaddr2, u32 val2, u32 val3); |
134 | |
135 | extern int |
136 | handle_futex_death(u32 __user *uaddr, struct task_struct *curr, int pi); |
137 | |
138 | /* |
139 | * Futexes are matched on equal values of this key. |
140 | * The key type depends on whether it's a shared or private mapping. |
141 | * Don't rearrange members without looking at hash_futex(). |
142 | * |
143 | * offset is aligned to a multiple of sizeof(u32) (== 4) by definition. |
144 | * We use the two low order bits of offset to tell what is the kind of key : |
145 | * 00 : Private process futex (PTHREAD_PROCESS_PRIVATE) |
146 | * (no reference on an inode or mm) |
147 | * 01 : Shared futex (PTHREAD_PROCESS_SHARED) |
148 | * mapped on a file (reference on the underlying inode) |
149 | * 10 : Shared futex (PTHREAD_PROCESS_SHARED) |
150 | * (but private mapping on an mm, and reference taken on it) |
151 | */ |
152 | |
153 | #define FUT_OFF_INODE 1 /* We set bit 0 if key has a reference on inode */ |
154 | #define FUT_OFF_MMSHARED 2 /* We set bit 1 if key has a reference on mm */ |
155 | |
156 | union 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 |
177 | extern void exit_robust_list(struct task_struct *curr); |
178 | extern void exit_pi_state_list(struct task_struct *curr); |
179 | extern int futex_cmpxchg_enabled; |
180 | #else |
181 | static inline void exit_robust_list(struct task_struct *curr) |
182 | { |
183 | } |
184 | static inline void exit_pi_state_list(struct task_struct *curr) |
185 | { |
186 | } |
187 | #endif |
188 | #endif /* __KERNEL__ */ |
189 | |
190 | #define FUTEX_OP_SET 0 /* *(int *)UADDR2 = OPARG; */ |
191 | #define FUTEX_OP_ADD 1 /* *(int *)UADDR2 += OPARG; */ |
192 | #define FUTEX_OP_OR 2 /* *(int *)UADDR2 |= OPARG; */ |
193 | #define FUTEX_OP_ANDN 3 /* *(int *)UADDR2 &= ~OPARG; */ |
194 | #define FUTEX_OP_XOR 4 /* *(int *)UADDR2 ^= OPARG; */ |
195 | |
196 | #define FUTEX_OP_OPARG_SHIFT 8 /* Use (1 << OPARG) instead of OPARG. */ |
197 | |
198 | #define FUTEX_OP_CMP_EQ 0 /* if (oldval == CMPARG) wake */ |
199 | #define FUTEX_OP_CMP_NE 1 /* if (oldval != CMPARG) wake */ |
200 | #define FUTEX_OP_CMP_LT 2 /* if (oldval < CMPARG) wake */ |
201 | #define FUTEX_OP_CMP_LE 3 /* if (oldval <= CMPARG) wake */ |
202 | #define FUTEX_OP_CMP_GT 4 /* if (oldval > CMPARG) wake */ |
203 | #define FUTEX_OP_CMP_GE 5 /* if (oldval >= CMPARG) wake */ |
204 | |
205 | /* FUTEX_WAKE_OP will perform atomically |
206 | int oldval = *(int *)UADDR2; |
207 | *(int *)UADDR2 = oldval OP OPARG; |
208 | if (oldval CMP CMPARG) |
209 | wake UADDR2; */ |
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 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9