mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 00:52:01 +00:00
65eb3dc609
This patch adds kernel doc for the completion feature. An error in the split-man.pl PERL snippet in kernel-doc-nano-HOWTO.txt is also fixed. Signed-off-by: Kevin Diggs <kevdig@hypersurf.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
#ifndef __LINUX_COMPLETION_H
|
|
#define __LINUX_COMPLETION_H
|
|
|
|
/*
|
|
* (C) Copyright 2001 Linus Torvalds
|
|
*
|
|
* Atomic wait-for-completion handler data structures.
|
|
* See kernel/sched.c for details.
|
|
*/
|
|
|
|
#include <linux/wait.h>
|
|
|
|
/**
|
|
* struct completion - structure used to maintain state for a "completion"
|
|
*
|
|
* This is the opaque structure used to maintain the state for a "completion".
|
|
* Completions currently use a FIFO to queue threads that have to wait for
|
|
* the "completion" event.
|
|
*
|
|
* See also: complete(), wait_for_completion() (and friends _timeout,
|
|
* _interruptible, _interruptible_timeout, and _killable), init_completion(),
|
|
* and macros DECLARE_COMPLETION(), DECLARE_COMPLETION_ONSTACK(), and
|
|
* INIT_COMPLETION().
|
|
*/
|
|
struct completion {
|
|
unsigned int done;
|
|
wait_queue_head_t wait;
|
|
};
|
|
|
|
#define COMPLETION_INITIALIZER(work) \
|
|
{ 0, __WAIT_QUEUE_HEAD_INITIALIZER((work).wait) }
|
|
|
|
#define COMPLETION_INITIALIZER_ONSTACK(work) \
|
|
({ init_completion(&work); work; })
|
|
|
|
/**
|
|
* DECLARE_COMPLETION: - declare and initialize a completion structure
|
|
* @work: identifier for the completion structure
|
|
*
|
|
* This macro declares and initializes a completion structure. Generally used
|
|
* for static declarations. You should use the _ONSTACK variant for automatic
|
|
* variables.
|
|
*/
|
|
#define DECLARE_COMPLETION(work) \
|
|
struct completion work = COMPLETION_INITIALIZER(work)
|
|
|
|
/*
|
|
* Lockdep needs to run a non-constant initializer for on-stack
|
|
* completions - so we use the _ONSTACK() variant for those that
|
|
* are on the kernel stack:
|
|
*/
|
|
/**
|
|
* DECLARE_COMPLETION_ONSTACK: - declare and initialize a completion structure
|
|
* @work: identifier for the completion structure
|
|
*
|
|
* This macro declares and initializes a completion structure on the kernel
|
|
* stack.
|
|
*/
|
|
#ifdef CONFIG_LOCKDEP
|
|
# define DECLARE_COMPLETION_ONSTACK(work) \
|
|
struct completion work = COMPLETION_INITIALIZER_ONSTACK(work)
|
|
#else
|
|
# define DECLARE_COMPLETION_ONSTACK(work) DECLARE_COMPLETION(work)
|
|
#endif
|
|
|
|
/**
|
|
* init_completion: - Initialize a dynamically allocated completion
|
|
* @x: completion structure that is to be initialized
|
|
*
|
|
* This inline function will initialize a dynamically created completion
|
|
* structure.
|
|
*/
|
|
static inline void init_completion(struct completion *x)
|
|
{
|
|
x->done = 0;
|
|
init_waitqueue_head(&x->wait);
|
|
}
|
|
|
|
extern void wait_for_completion(struct completion *);
|
|
extern int wait_for_completion_interruptible(struct completion *x);
|
|
extern int wait_for_completion_killable(struct completion *x);
|
|
extern unsigned long wait_for_completion_timeout(struct completion *x,
|
|
unsigned long timeout);
|
|
extern unsigned long wait_for_completion_interruptible_timeout(
|
|
struct completion *x, unsigned long timeout);
|
|
extern bool try_wait_for_completion(struct completion *x);
|
|
extern bool completion_done(struct completion *x);
|
|
|
|
extern void complete(struct completion *);
|
|
extern void complete_all(struct completion *);
|
|
|
|
/**
|
|
* INIT_COMPLETION: - reinitialize a completion structure
|
|
* @x: completion structure to be reinitialized
|
|
*
|
|
* This macro should be used to reinitialize a completion structure so it can
|
|
* be reused. This is especially important after complete_all() is used.
|
|
*/
|
|
#define INIT_COMPLETION(x) ((x).done = 0)
|
|
|
|
|
|
#endif
|