diff options
author | David Howells <dhowells@redhat.com> | 2012-10-13 05:46:48 -0400 |
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committer | David Howells <dhowells@redhat.com> | 2012-10-13 05:46:48 -0400 |
commit | 607ca46e97a1b6594b29647d98a32d545c24bdff (patch) | |
tree | 30f4c0784bfddb57332cdc0678bd06d1e77fa185 /include/linux/futex.h | |
parent | 08cce05c5a91f5017f4edc9866cf026908c73f9f (diff) |
UAPI: (Scripted) Disintegrate include/linux
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Michael Kerrisk <mtk.manpages@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'include/linux/futex.h')
-rw-r--r-- | include/linux/futex.h | 150 |
1 files changed, 1 insertions, 149 deletions
diff --git a/include/linux/futex.h b/include/linux/futex.h index 1e5a26d79232..b0d95cac826e 100644 --- a/include/linux/futex.h +++ b/include/linux/futex.h | |||
@@ -1,129 +1,8 @@ | |||
1 | #ifndef _LINUX_FUTEX_H | 1 | #ifndef _LINUX_FUTEX_H |
2 | #define _LINUX_FUTEX_H | 2 | #define _LINUX_FUTEX_H |
3 | 3 | ||
4 | #include <linux/compiler.h> | 4 | #include <uapi/linux/futex.h> |
5 | #include <linux/types.h> | ||
6 | 5 | ||
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; | 6 | struct inode; |
128 | struct mm_struct; | 7 | struct mm_struct; |
129 | struct task_struct; | 8 | struct task_struct; |
@@ -185,31 +64,4 @@ static inline void exit_pi_state_list(struct task_struct *curr) | |||
185 | { | 64 | { |
186 | } | 65 | } |
187 | #endif | 66 | #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 | 67 | #endif |