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1 | #ifndef __LINUX_COMPLETION_H | |
2 | #define __LINUX_COMPLETION_H | |
3 | ||
4 | /* | |
5 | * (C) Copyright 2001 Linus Torvalds | |
6 | * | |
7 | * Atomic wait-for-completion handler data structures. | |
8 | * See kernel/sched/completion.c for details. | |
9 | */ | |
10 | ||
11 | #include <linux/wait.h> | |
12 | #ifdef CONFIG_LOCKDEP_COMPLETIONS | |
13 | #include <linux/lockdep.h> | |
14 | #endif | |
15 | ||
16 | /* | |
17 | * struct completion - structure used to maintain state for a "completion" | |
18 | * | |
19 | * This is the opaque structure used to maintain the state for a "completion". | |
20 | * Completions currently use a FIFO to queue threads that have to wait for | |
21 | * the "completion" event. | |
22 | * | |
23 | * See also: complete(), wait_for_completion() (and friends _timeout, | |
24 | * _interruptible, _interruptible_timeout, and _killable), init_completion(), | |
25 | * reinit_completion(), and macros DECLARE_COMPLETION(), | |
26 | * DECLARE_COMPLETION_ONSTACK(). | |
27 | */ | |
28 | struct completion { | |
29 | unsigned int done; | |
30 | wait_queue_head_t wait; | |
31 | #ifdef CONFIG_LOCKDEP_COMPLETIONS | |
32 | struct lockdep_map_cross map; | |
33 | #endif | |
34 | }; | |
35 | ||
36 | #ifdef CONFIG_LOCKDEP_COMPLETIONS | |
37 | static inline void complete_acquire(struct completion *x) | |
38 | { | |
39 | lock_acquire_exclusive((struct lockdep_map *)&x->map, 0, 0, NULL, _RET_IP_); | |
40 | } | |
41 | ||
42 | static inline void complete_release(struct completion *x) | |
43 | { | |
44 | lock_release((struct lockdep_map *)&x->map, 0, _RET_IP_); | |
45 | } | |
46 | ||
47 | static inline void complete_release_commit(struct completion *x) | |
48 | { | |
49 | lock_commit_crosslock((struct lockdep_map *)&x->map); | |
50 | } | |
51 | ||
52 | #define init_completion(x) \ | |
53 | do { \ | |
54 | static struct lock_class_key __key; \ | |
55 | lockdep_init_map_crosslock((struct lockdep_map *)&(x)->map, \ | |
56 | "(complete)" #x, \ | |
57 | &__key, 0); \ | |
58 | __init_completion(x); \ | |
59 | } while (0) | |
60 | #else | |
61 | #define init_completion(x) __init_completion(x) | |
62 | static inline void complete_acquire(struct completion *x) {} | |
63 | static inline void complete_release(struct completion *x) {} | |
64 | static inline void complete_release_commit(struct completion *x) {} | |
65 | #endif | |
66 | ||
67 | #ifdef CONFIG_LOCKDEP_COMPLETIONS | |
68 | #define COMPLETION_INITIALIZER(work) \ | |
69 | { 0, __WAIT_QUEUE_HEAD_INITIALIZER((work).wait), \ | |
70 | STATIC_CROSS_LOCKDEP_MAP_INIT("(complete)" #work, &(work)) } | |
71 | #else | |
72 | #define COMPLETION_INITIALIZER(work) \ | |
73 | { 0, __WAIT_QUEUE_HEAD_INITIALIZER((work).wait) } | |
74 | #endif | |
75 | ||
76 | #define COMPLETION_INITIALIZER_ONSTACK(work) \ | |
77 | (*({ init_completion(&work); &work; })) | |
78 | ||
79 | /** | |
80 | * DECLARE_COMPLETION - declare and initialize a completion structure | |
81 | * @work: identifier for the completion structure | |
82 | * | |
83 | * This macro declares and initializes a completion structure. Generally used | |
84 | * for static declarations. You should use the _ONSTACK variant for automatic | |
85 | * variables. | |
86 | */ | |
87 | #define DECLARE_COMPLETION(work) \ | |
88 | struct completion work = COMPLETION_INITIALIZER(work) | |
89 | ||
90 | /* | |
91 | * Lockdep needs to run a non-constant initializer for on-stack | |
92 | * completions - so we use the _ONSTACK() variant for those that | |
93 | * are on the kernel stack: | |
94 | */ | |
95 | /** | |
96 | * DECLARE_COMPLETION_ONSTACK - declare and initialize a completion structure | |
97 | * @work: identifier for the completion structure | |
98 | * | |
99 | * This macro declares and initializes a completion structure on the kernel | |
100 | * stack. | |
101 | */ | |
102 | #ifdef CONFIG_LOCKDEP | |
103 | # define DECLARE_COMPLETION_ONSTACK(work) \ | |
104 | struct completion work = COMPLETION_INITIALIZER_ONSTACK(work) | |
105 | #else | |
106 | # define DECLARE_COMPLETION_ONSTACK(work) DECLARE_COMPLETION(work) | |
107 | #endif | |
108 | ||
109 | /** | |
110 | * init_completion - Initialize a dynamically allocated completion | |
111 | * @x: pointer to completion structure that is to be initialized | |
112 | * | |
113 | * This inline function will initialize a dynamically created completion | |
114 | * structure. | |
115 | */ | |
116 | static inline void __init_completion(struct completion *x) | |
117 | { | |
118 | x->done = 0; | |
119 | init_waitqueue_head(&x->wait); | |
120 | } | |
121 | ||
122 | /** | |
123 | * reinit_completion - reinitialize a completion structure | |
124 | * @x: pointer to completion structure that is to be reinitialized | |
125 | * | |
126 | * This inline function should be used to reinitialize a completion structure so it can | |
127 | * be reused. This is especially important after complete_all() is used. | |
128 | */ | |
129 | static inline void reinit_completion(struct completion *x) | |
130 | { | |
131 | x->done = 0; | |
132 | } | |
133 | ||
134 | extern void wait_for_completion(struct completion *); | |
135 | extern void wait_for_completion_io(struct completion *); | |
136 | extern int wait_for_completion_interruptible(struct completion *x); | |
137 | extern int wait_for_completion_killable(struct completion *x); | |
138 | extern unsigned long wait_for_completion_timeout(struct completion *x, | |
139 | unsigned long timeout); | |
140 | extern unsigned long wait_for_completion_io_timeout(struct completion *x, | |
141 | unsigned long timeout); | |
142 | extern long wait_for_completion_interruptible_timeout( | |
143 | struct completion *x, unsigned long timeout); | |
144 | extern long wait_for_completion_killable_timeout( | |
145 | struct completion *x, unsigned long timeout); | |
146 | extern bool try_wait_for_completion(struct completion *x); | |
147 | extern bool completion_done(struct completion *x); | |
148 | ||
149 | extern void complete(struct completion *); | |
150 | extern void complete_all(struct completion *); | |
151 | ||
152 | #endif |