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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
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 * reinit_completion(), and macros DECLARE_COMPLETION(),
23 * DECLARE_COMPLETION_ONSTACK().
24 */
25struct 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: pointer to completion structure that is to be initialized
69 *
70 * This inline function will initialize a dynamically created completion
71 * structure.
72 */
73static inline void init_completion(struct completion *x)
74{
75 x->done = 0;
76 init_waitqueue_head(&x->wait);
77}
78
79/**
80 * reinit_completion - reinitialize a completion structure
81 * @x: pointer to completion structure that is to be reinitialized
82 *
83 * This inline function should be used to reinitialize a completion structure so it can
84 * be reused. This is especially important after complete_all() is used.
85 */
86static inline void reinit_completion(struct completion *x)
87{
88 x->done = 0;
89}
90
91extern void wait_for_completion(struct completion *);
92extern void wait_for_completion_io(struct completion *);
93extern int wait_for_completion_interruptible(struct completion *x);
94extern int wait_for_completion_killable(struct completion *x);
95extern unsigned long wait_for_completion_timeout(struct completion *x,
96 unsigned long timeout);
97extern unsigned long wait_for_completion_io_timeout(struct completion *x,
98 unsigned long timeout);
99extern long wait_for_completion_interruptible_timeout(
100 struct completion *x, unsigned long timeout);
101extern long wait_for_completion_killable_timeout(
102 struct completion *x, unsigned long timeout);
103extern bool try_wait_for_completion(struct completion *x);
104extern bool completion_done(struct completion *x);
105
106extern void complete(struct completion *);
107extern void complete_all(struct completion *);
108
109#endif
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __LINUX_COMPLETION_H
3#define __LINUX_COMPLETION_H
4
5/*
6 * (C) Copyright 2001 Linus Torvalds
7 *
8 * Atomic wait-for-completion handler data structures.
9 * See kernel/sched/completion.c for details.
10 */
11
12#include <linux/swait.h>
13
14/*
15 * struct completion - structure used to maintain state for a "completion"
16 *
17 * This is the opaque structure used to maintain the state for a "completion".
18 * Completions currently use a FIFO to queue threads that have to wait for
19 * the "completion" event.
20 *
21 * See also: complete(), wait_for_completion() (and friends _timeout,
22 * _interruptible, _interruptible_timeout, and _killable), init_completion(),
23 * reinit_completion(), and macros DECLARE_COMPLETION(),
24 * DECLARE_COMPLETION_ONSTACK().
25 */
26struct completion {
27 unsigned int done;
28 struct swait_queue_head wait;
29};
30
31#define init_completion_map(x, m) init_completion(x)
32static inline void complete_acquire(struct completion *x) {}
33static inline void complete_release(struct completion *x) {}
34
35#define COMPLETION_INITIALIZER(work) \
36 { 0, __SWAIT_QUEUE_HEAD_INITIALIZER((work).wait) }
37
38#define COMPLETION_INITIALIZER_ONSTACK_MAP(work, map) \
39 (*({ init_completion_map(&(work), &(map)); &(work); }))
40
41#define COMPLETION_INITIALIZER_ONSTACK(work) \
42 (*({ init_completion(&work); &work; }))
43
44/**
45 * DECLARE_COMPLETION - declare and initialize a completion structure
46 * @work: identifier for the completion structure
47 *
48 * This macro declares and initializes a completion structure. Generally used
49 * for static declarations. You should use the _ONSTACK variant for automatic
50 * variables.
51 */
52#define DECLARE_COMPLETION(work) \
53 struct completion work = COMPLETION_INITIALIZER(work)
54
55/*
56 * Lockdep needs to run a non-constant initializer for on-stack
57 * completions - so we use the _ONSTACK() variant for those that
58 * are on the kernel stack:
59 */
60/**
61 * DECLARE_COMPLETION_ONSTACK - declare and initialize a completion structure
62 * @work: identifier for the completion structure
63 *
64 * This macro declares and initializes a completion structure on the kernel
65 * stack.
66 */
67#ifdef CONFIG_LOCKDEP
68# define DECLARE_COMPLETION_ONSTACK(work) \
69 struct completion work = COMPLETION_INITIALIZER_ONSTACK(work)
70# define DECLARE_COMPLETION_ONSTACK_MAP(work, map) \
71 struct completion work = COMPLETION_INITIALIZER_ONSTACK_MAP(work, map)
72#else
73# define DECLARE_COMPLETION_ONSTACK(work) DECLARE_COMPLETION(work)
74# define DECLARE_COMPLETION_ONSTACK_MAP(work, map) DECLARE_COMPLETION(work)
75#endif
76
77/**
78 * init_completion - Initialize a dynamically allocated completion
79 * @x: pointer to completion structure that is to be initialized
80 *
81 * This inline function will initialize a dynamically created completion
82 * structure.
83 */
84static inline void init_completion(struct completion *x)
85{
86 x->done = 0;
87 init_swait_queue_head(&x->wait);
88}
89
90/**
91 * reinit_completion - reinitialize a completion structure
92 * @x: pointer to completion structure that is to be reinitialized
93 *
94 * This inline function should be used to reinitialize a completion structure so it can
95 * be reused. This is especially important after complete_all() is used.
96 */
97static inline void reinit_completion(struct completion *x)
98{
99 x->done = 0;
100}
101
102extern void wait_for_completion(struct completion *);
103extern void wait_for_completion_io(struct completion *);
104extern int wait_for_completion_interruptible(struct completion *x);
105extern int wait_for_completion_killable(struct completion *x);
106extern int wait_for_completion_state(struct completion *x, unsigned int state);
107extern unsigned long wait_for_completion_timeout(struct completion *x,
108 unsigned long timeout);
109extern unsigned long wait_for_completion_io_timeout(struct completion *x,
110 unsigned long timeout);
111extern long wait_for_completion_interruptible_timeout(
112 struct completion *x, unsigned long timeout);
113extern long wait_for_completion_killable_timeout(
114 struct completion *x, unsigned long timeout);
115extern bool try_wait_for_completion(struct completion *x);
116extern bool completion_done(struct completion *x);
117
118extern void complete(struct completion *);
119extern void complete_all(struct completion *);
120
121#endif