include/linux/completion.h

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