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1 | #ifndef _LINUX_FUTEX_H |
2 | #define _LINUX_FUTEX_H |
3 | |
4 | #include <uapi/linux/futex.h> |
5 | |
6 | struct inode; |
7 | struct mm_struct; |
8 | struct task_struct; |
9 | union ktime; |
10 | |
11 | long do_futex(u32 __user *uaddr, int op, u32 val, union ktime *timeout, |
12 | u32 __user *uaddr2, u32 val2, u32 val3); |
13 | |
14 | extern int |
15 | handle_futex_death(u32 __user *uaddr, struct task_struct *curr, int pi); |
16 | |
17 | /* |
18 | * Futexes are matched on equal values of this key. |
19 | * The key type depends on whether it's a shared or private mapping. |
20 | * Don't rearrange members without looking at hash_futex(). |
21 | * |
22 | * offset is aligned to a multiple of sizeof(u32) (== 4) by definition. |
23 | * We use the two low order bits of offset to tell what is the kind of key : |
24 | * 00 : Private process futex (PTHREAD_PROCESS_PRIVATE) |
25 | * (no reference on an inode or mm) |
26 | * 01 : Shared futex (PTHREAD_PROCESS_SHARED) |
27 | * mapped on a file (reference on the underlying inode) |
28 | * 10 : Shared futex (PTHREAD_PROCESS_SHARED) |
29 | * (but private mapping on an mm, and reference taken on it) |
30 | */ |
31 | |
32 | #define FUT_OFF_INODE 1 /* We set bit 0 if key has a reference on inode */ |
33 | #define FUT_OFF_MMSHARED 2 /* We set bit 1 if key has a reference on mm */ |
34 | |
35 | union futex_key { |
36 | struct { |
37 | unsigned long pgoff; |
38 | struct inode *inode; |
39 | int offset; |
40 | } shared; |
41 | struct { |
42 | unsigned long address; |
43 | struct mm_struct *mm; |
44 | int offset; |
45 | } private; |
46 | struct { |
47 | unsigned long word; |
48 | void *ptr; |
49 | int offset; |
50 | } both; |
51 | }; |
52 | |
53 | #define FUTEX_KEY_INIT (union futex_key) { .both = { .ptr = NULL } } |
54 | |
55 | #ifdef CONFIG_FUTEX |
56 | extern void exit_robust_list(struct task_struct *curr); |
57 | extern void exit_pi_state_list(struct task_struct *curr); |
58 | extern int futex_cmpxchg_enabled; |
59 | #else |
60 | static inline void exit_robust_list(struct task_struct *curr) |
61 | { |
62 | } |
63 | static inline void exit_pi_state_list(struct task_struct *curr) |
64 | { |
65 | } |
66 | #endif |
67 | #endif |
68 |
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