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 struct completion {
14 unsigned int done;
15 wait_queue_head_t wait;
16 };
17
18 #define COMPLETION_INITIALIZER(work) \
19 { 0, __WAIT_QUEUE_HEAD_INITIALIZER((work).wait) }
20
21 #define COMPLETION_INITIALIZER_ONSTACK(work) \
22 ({ init_completion(&work); work; })
23
24 #define DECLARE_COMPLETION(work) \
25 struct completion work = COMPLETION_INITIALIZER(work)
26
27 /*
28 * Lockdep needs to run a non-constant initializer for on-stack
29 * completions - so we use the _ONSTACK() variant for those that
30 * are on the kernel stack:
31 */
32 #ifdef CONFIG_LOCKDEP
33 # define DECLARE_COMPLETION_ONSTACK(work) \
34 struct completion work = COMPLETION_INITIALIZER_ONSTACK(work)
35 #else
36 # define DECLARE_COMPLETION_ONSTACK(work) DECLARE_COMPLETION(work)
37 #endif
38
39 static inline void init_completion(struct completion *x)
40 {
41 x->done = 0;
42 init_waitqueue_head(&x->wait);
43 }
44
45 extern void wait_for_completion(struct completion *);
46 extern int wait_for_completion_interruptible(struct completion *x);
47 extern int wait_for_completion_killable(struct completion *x);
48 extern unsigned long wait_for_completion_timeout(struct completion *x,
49 unsigned long timeout);
50 extern unsigned long wait_for_completion_interruptible_timeout(
51 struct completion *x, unsigned long timeout);
52
53 extern void complete(struct completion *);
54 extern void complete_all(struct completion *);
55
56 #define INIT_COMPLETION(x) ((x).done = 0)
57
58 #endif
59
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