Quelle completion.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_COMPLETION_H
#define __LINUX_COMPLETION_H

/*
* (C) Copyright 2001 Linus Torvalds
*
* Atomic wait-for-completion handler data structures.
* See kernel/sched/completion.c for details.
*/

#include <linux/swait.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(),
* reinit_completion(), and macros DECLARE_COMPLETION(),
* DECLARE_COMPLETION_ONSTACK().
*/
struct completion {
unsigned int done;
struct swait_queue_head wait;
};

#define init_completion_map(x, m) init_completion(x)
static inline void complete_acquire(struct completion *x) {}
static inline void complete_release(struct completion *x) {}

#define COMPLETION_INITIALIZER(work) \
{ 0, __SWAIT_QUEUE_HEAD_INITIALIZER((work).wait) }

#define COMPLETION_INITIALIZER_ONSTACK_MAP(work, map) \
(*({ init_completion_map(&(work), &(map)); &(work); }))

#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)
# define DECLARE_COMPLETION_ONSTACK_MAP(work, map) \
struct completion work = COMPLETION_INITIALIZER_ONSTACK_MAP(work, map)
#else
# define DECLARE_COMPLETION_ONSTACK(work) DECLARE_COMPLETION(work)
# define DECLARE_COMPLETION_ONSTACK_MAP(work, map) DECLARE_COMPLETION(work)
#endif

/**
* init_completion - Initialize a dynamically allocated completion
* @x:  pointer to 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_swait_queue_head(&x->wait);
}

/**
* reinit_completion - reinitialize a completion structure
* @x:  pointer to completion structure that is to be reinitialized
*
* This inline function should be used to reinitialize a completion structure so it can
* be reused. This is especially important after complete_all() is used.
*/
static inline void reinit_completion(struct completion *x)
{
x->done = 0;
}

extern void wait_for_completion(struct completion *);
extern void wait_for_completion_io(struct completion *);
extern int wait_for_completion_interruptible(struct completion *x);
extern int wait_for_completion_killable(struct completion *x);
extern int wait_for_completion_state(struct completion *x, unsigned int state);
extern unsigned long wait_for_completion_timeout(struct completion *x,
         unsigned long timeout);
extern unsigned long wait_for_completion_io_timeout(struct completion *x,
          unsigned long timeout);
extern long wait_for_completion_interruptible_timeout(
struct completion *x, unsigned long timeout);
extern long wait_for_completion_killable_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_on_current_cpu(struct completion *x);
extern void complete_all(struct completion *);

#endif

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