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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 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 extern bool try_wait_for_completion(struct completion *x);
  53 extern bool completion_done(struct completion *x);
  54
  55 extern void complete(struct completion *);
  56 extern void complete_all(struct completion *);
  57
  58 #define INIT_COMPLETION(x)      ((x).done = 0)
  59
  60
  61 #endif