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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.c for details. |
9 | */ |
10 | |
11 | #include <linux/wait.h> |
12 | |
13 | /* |
14 | * struct completion - structure used to maintain state for a "completion" |
15 | * |
16 | * This is the opaque structure used to maintain the state for a "completion". |
17 | * Completions currently use a FIFO to queue threads that have to wait for |
18 | * the "completion" event. |
19 | * |
20 | * See also: complete(), wait_for_completion() (and friends _timeout, |
21 | * _interruptible, _interruptible_timeout, and _killable), init_completion(), |
22 | * and macros DECLARE_COMPLETION(), DECLARE_COMPLETION_ONSTACK(), and |
23 | * INIT_COMPLETION(). |
24 | */ |
25 | struct completion { |
26 | unsigned int done; |
27 | wait_queue_head_t wait; |
28 | }; |
29 | |
30 | #define COMPLETION_INITIALIZER(work) \ |
31 | { 0, __WAIT_QUEUE_HEAD_INITIALIZER((work).wait) } |
32 | |
33 | #define COMPLETION_INITIALIZER_ONSTACK(work) \ |
34 | ({ init_completion(&work); work; }) |
35 | |
36 | /** |
37 | * DECLARE_COMPLETION - declare and initialize a completion structure |
38 | * @work: identifier for the completion structure |
39 | * |
40 | * This macro declares and initializes a completion structure. Generally used |
41 | * for static declarations. You should use the _ONSTACK variant for automatic |
42 | * variables. |
43 | */ |
44 | #define DECLARE_COMPLETION(work) \ |
45 | struct completion work = COMPLETION_INITIALIZER(work) |
46 | |
47 | /* |
48 | * Lockdep needs to run a non-constant initializer for on-stack |
49 | * completions - so we use the _ONSTACK() variant for those that |
50 | * are on the kernel stack: |
51 | */ |
52 | /** |
53 | * DECLARE_COMPLETION_ONSTACK - declare and initialize a completion structure |
54 | * @work: identifier for the completion structure |
55 | * |
56 | * This macro declares and initializes a completion structure on the kernel |
57 | * stack. |
58 | */ |
59 | #ifdef CONFIG_LOCKDEP |
60 | # define DECLARE_COMPLETION_ONSTACK(work) \ |
61 | struct completion work = COMPLETION_INITIALIZER_ONSTACK(work) |
62 | #else |
63 | # define DECLARE_COMPLETION_ONSTACK(work) DECLARE_COMPLETION(work) |
64 | #endif |
65 | |
66 | /** |
67 | * init_completion - Initialize a dynamically allocated completion |
68 | * @x: completion structure that is to be initialized |
69 | * |
70 | * This inline function will initialize a dynamically created completion |
71 | * structure. |
72 | */ |
73 | static inline void init_completion(struct completion *x) |
74 | { |
75 | x->done = 0; |
76 | init_waitqueue_head(&x->wait); |
77 | } |
78 | |
79 | extern void wait_for_completion(struct completion *); |
80 | extern int wait_for_completion_interruptible(struct completion *x); |
81 | extern int wait_for_completion_killable(struct completion *x); |
82 | extern unsigned long wait_for_completion_timeout(struct completion *x, |
83 | unsigned long timeout); |
84 | extern long wait_for_completion_interruptible_timeout( |
85 | struct completion *x, unsigned long timeout); |
86 | extern long wait_for_completion_killable_timeout( |
87 | struct completion *x, unsigned long timeout); |
88 | extern bool try_wait_for_completion(struct completion *x); |
89 | extern bool completion_done(struct completion *x); |
90 | |
91 | extern void complete(struct completion *); |
92 | extern void complete_all(struct completion *); |
93 | |
94 | /** |
95 | * INIT_COMPLETION - reinitialize a completion structure |
96 | * @x: completion structure to be reinitialized |
97 | * |
98 | * This macro should be used to reinitialize a completion structure so it can |
99 | * be reused. This is especially important after complete_all() is used. |
100 | */ |
101 | #define INIT_COMPLETION(x) ((x).done = 0) |
102 | |
103 | |
104 | #endif |
105 |
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