[deliverable/linux.git] / include / linux / workqueue.h

/*
 * workqueue.h --- work queue handling for Linux.
 */

#ifndef _LINUX_WORKQUEUE_H
#define _LINUX_WORKQUEUE_H

#include <linux/timer.h>
#include <linux/linkage.h>
#include <linux/bitops.h>
#include <linux/lockdep.h>
#include <asm/atomic.h>

struct workqueue_struct;

struct work_struct;
typedef void (*work_func_t)(struct work_struct *work);

/*
 * The first word is the work queue pointer and the flags rolled into
 * one
 */
#define work_data_bits(work) ((unsigned long *)(&(work)->data))

enum {
	WORK_STRUCT_PENDING_BIT	= 0,	/* work item is pending execution */
#ifdef CONFIG_DEBUG_OBJECTS_WORK
	WORK_STRUCT_STATIC_BIT	= 1,	/* static initializer (debugobjects) */
	WORK_STRUCT_COLOR_SHIFT	= 3,	/* color for workqueue flushing */
#else
	WORK_STRUCT_COLOR_SHIFT	= 2,	/* color for workqueue flushing */
#endif

	WORK_STRUCT_COLOR_BITS	= 4,

	WORK_STRUCT_PENDING	= 1 << WORK_STRUCT_PENDING_BIT,
#ifdef CONFIG_DEBUG_OBJECTS_WORK
	WORK_STRUCT_STATIC	= 1 << WORK_STRUCT_STATIC_BIT,
#else
	WORK_STRUCT_STATIC	= 0,
#endif

	/*
	 * The last color is no color used for works which don't
	 * participate in workqueue flushing.
	 */
	WORK_NR_COLORS		= (1 << WORK_STRUCT_COLOR_BITS) - 1,
	WORK_NO_COLOR		= WORK_NR_COLORS,

	/*
	 * Reserve 6 bits off of cwq pointer w/ debugobjects turned
	 * off.  This makes cwqs aligned to 64 bytes which isn't too
	 * excessive while allowing 15 workqueue flush colors.
	 */
	WORK_STRUCT_FLAG_BITS	= WORK_STRUCT_COLOR_SHIFT +
				  WORK_STRUCT_COLOR_BITS,

	WORK_STRUCT_FLAG_MASK	= (1UL << WORK_STRUCT_FLAG_BITS) - 1,
	WORK_STRUCT_WQ_DATA_MASK = ~WORK_STRUCT_FLAG_MASK,
};

struct work_struct {
	atomic_long_t data;
	struct list_head entry;
	work_func_t func;
#ifdef CONFIG_LOCKDEP
	struct lockdep_map lockdep_map;
#endif
};

#define WORK_DATA_INIT()	ATOMIC_LONG_INIT(0)
#define WORK_DATA_STATIC_INIT()	ATOMIC_LONG_INIT(WORK_STRUCT_STATIC)

struct delayed_work {
	struct work_struct work;
	struct timer_list timer;
};

static inline struct delayed_work *to_delayed_work(struct work_struct *work)
{
	return container_of(work, struct delayed_work, work);
}

struct execute_work {
	struct work_struct work;
};

#ifdef CONFIG_LOCKDEP
/*
 * NB: because we have to copy the lockdep_map, setting _key
 * here is required, otherwise it could get initialised to the
 * copy of the lockdep_map!
 */
#define __WORK_INIT_LOCKDEP_MAP(n, k) \
	.lockdep_map = STATIC_LOCKDEP_MAP_INIT(n, k),
#else
#define __WORK_INIT_LOCKDEP_MAP(n, k)
#endif

#define __WORK_INITIALIZER(n, f) {				\
	.data = WORK_DATA_STATIC_INIT(),			\
	.entry	= { &(n).entry, &(n).entry },			\
	.func = (f),						\
	__WORK_INIT_LOCKDEP_MAP(#n, &(n))			\
	}

#define __DELAYED_WORK_INITIALIZER(n, f) {			\
	.work = __WORK_INITIALIZER((n).work, (f)),		\
	.timer = TIMER_INITIALIZER(NULL, 0, 0),			\
	}

#define DECLARE_WORK(n, f)					\
	struct work_struct n = __WORK_INITIALIZER(n, f)

#define DECLARE_DELAYED_WORK(n, f)				\
	struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f)

/*
 * initialize a work item's function pointer
 */
#define PREPARE_WORK(_work, _func)				\
	do {							\
		(_work)->func = (_func);			\
	} while (0)

#define PREPARE_DELAYED_WORK(_work, _func)			\
	PREPARE_WORK(&(_work)->work, (_func))

#ifdef CONFIG_DEBUG_OBJECTS_WORK
extern void __init_work(struct work_struct *work, int onstack);
extern void destroy_work_on_stack(struct work_struct *work);
static inline unsigned int work_static(struct work_struct *work)
{
	return *work_data_bits(work) & WORK_STRUCT_STATIC;
}
#else
static inline void __init_work(struct work_struct *work, int onstack) { }
static inline void destroy_work_on_stack(struct work_struct *work) { }
static inline unsigned int work_static(struct work_struct *work) { return 0; }
#endif

/*
 * initialize all of a work item in one go
 *
 * NOTE! No point in using "atomic_long_set()": using a direct
 * assignment of the work data initializer allows the compiler
 * to generate better code.
 */
#ifdef CONFIG_LOCKDEP
#define __INIT_WORK(_work, _func, _onstack)				\
	do {								\
		static struct lock_class_key __key;			\
									\
		__init_work((_work), _onstack);				\
		(_work)->data = (atomic_long_t) WORK_DATA_INIT();	\
		lockdep_init_map(&(_work)->lockdep_map, #_work, &__key, 0);\
		INIT_LIST_HEAD(&(_work)->entry);			\
		PREPARE_WORK((_work), (_func));				\
	} while (0)
#else
#define __INIT_WORK(_work, _func, _onstack)				\
	do {								\
		__init_work((_work), _onstack);				\
		(_work)->data = (atomic_long_t) WORK_DATA_INIT();	\
		INIT_LIST_HEAD(&(_work)->entry);			\
		PREPARE_WORK((_work), (_func));				\
	} while (0)
#endif

#define INIT_WORK(_work, _func)					\
	do {							\
		__INIT_WORK((_work), (_func), 0);		\
	} while (0)

#define INIT_WORK_ON_STACK(_work, _func)			\
	do {							\
		__INIT_WORK((_work), (_func), 1);		\
	} while (0)

#define INIT_DELAYED_WORK(_work, _func)				\
	do {							\
		INIT_WORK(&(_work)->work, (_func));		\
		init_timer(&(_work)->timer);			\
	} while (0)

#define INIT_DELAYED_WORK_ON_STACK(_work, _func)		\
	do {							\
		INIT_WORK_ON_STACK(&(_work)->work, (_func));	\
		init_timer_on_stack(&(_work)->timer);		\
	} while (0)

#define INIT_DELAYED_WORK_DEFERRABLE(_work, _func)		\
	do {							\
		INIT_WORK(&(_work)->work, (_func));		\
		init_timer_deferrable(&(_work)->timer);		\
	} while (0)

/**
 * work_pending - Find out whether a work item is currently pending
 * @work: The work item in question
 */
#define work_pending(work) \
	test_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))

/**
 * delayed_work_pending - Find out whether a delayable work item is currently
 * pending
 * @work: The work item in question
 */
#define delayed_work_pending(w) \
	work_pending(&(w)->work)

/**
 * work_clear_pending - for internal use only, mark a work item as not pending
 * @work: The work item in question
 */
#define work_clear_pending(work) \
	clear_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))

enum {
	WQ_FREEZEABLE		= 1 << 0, /* freeze during suspend */
	WQ_SINGLE_THREAD	= 1 << 1, /* no per-cpu worker */
};

extern struct workqueue_struct *
__create_workqueue_key(const char *name, unsigned int flags,
		       struct lock_class_key *key, const char *lock_name);

#ifdef CONFIG_LOCKDEP
#define __create_workqueue(name, flags)				\
({								\
	static struct lock_class_key __key;			\
	const char *__lock_name;				\
								\
	if (__builtin_constant_p(name))				\
		__lock_name = (name);				\
	else							\
		__lock_name = #name;				\
								\
	__create_workqueue_key((name), (flags), &__key,		\
			       __lock_name);			\
})
#else
#define __create_workqueue(name, flags)				\
	__create_workqueue_key((name), (flags), NULL, NULL)
#endif

#define create_workqueue(name)					\
	__create_workqueue((name), 0)
#define create_freezeable_workqueue(name)			\
	__create_workqueue((name), WQ_FREEZEABLE | WQ_SINGLE_THREAD)
#define create_singlethread_workqueue(name)			\
	__create_workqueue((name), WQ_SINGLE_THREAD)

extern void destroy_workqueue(struct workqueue_struct *wq);

extern int queue_work(struct workqueue_struct *wq, struct work_struct *work);
extern int queue_work_on(int cpu, struct workqueue_struct *wq,
			struct work_struct *work);
extern int queue_delayed_work(struct workqueue_struct *wq,
			struct delayed_work *work, unsigned long delay);
extern int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
			struct delayed_work *work, unsigned long delay);

extern void flush_workqueue(struct workqueue_struct *wq);
extern void flush_scheduled_work(void);
extern void flush_delayed_work(struct delayed_work *work);

extern int schedule_work(struct work_struct *work);
extern int schedule_work_on(int cpu, struct work_struct *work);
extern int schedule_delayed_work(struct delayed_work *work, unsigned long delay);
extern int schedule_delayed_work_on(int cpu, struct delayed_work *work,
					unsigned long delay);
extern int schedule_on_each_cpu(work_func_t func);
extern int current_is_keventd(void);
extern int keventd_up(void);

extern void init_workqueues(void);
int execute_in_process_context(work_func_t fn, struct execute_work *);

extern int flush_work(struct work_struct *work);

extern int cancel_work_sync(struct work_struct *work);

/*
 * Kill off a pending schedule_delayed_work().  Note that the work callback
 * function may still be running on return from cancel_delayed_work(), unless
 * it returns 1 and the work doesn't re-arm itself. Run flush_workqueue() or
 * cancel_work_sync() to wait on it.
 */
static inline int cancel_delayed_work(struct delayed_work *work)
{
	int ret;

	ret = del_timer_sync(&work->timer);
	if (ret)
		work_clear_pending(&work->work);
	return ret;
}

/*
 * Like above, but uses del_timer() instead of del_timer_sync(). This means,
 * if it returns 0 the timer function may be running and the queueing is in
 * progress.
 */
static inline int __cancel_delayed_work(struct delayed_work *work)
{
	int ret;

	ret = del_timer(&work->timer);
	if (ret)
		work_clear_pending(&work->work);
	return ret;
}

extern int cancel_delayed_work_sync(struct delayed_work *work);

/* Obsolete. use cancel_delayed_work_sync() */
static inline
void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq,
					struct delayed_work *work)
{
	cancel_delayed_work_sync(work);
}

/* Obsolete. use cancel_delayed_work_sync() */
static inline
void cancel_rearming_delayed_work(struct delayed_work *work)
{
	cancel_delayed_work_sync(work);
}

#ifndef CONFIG_SMP
static inline long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
{
	return fn(arg);
}
#else
long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg);
#endif /* CONFIG_SMP */
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* workqueue.h --- work queue handling for Linux.
	3	*/
	4
	5	#ifndef _LINUX_WORKQUEUE_H
	6	#define _LINUX_WORKQUEUE_H
	7
	8	#include <linux/timer.h>
	9	#include <linux/linkage.h>
	10	#include <linux/bitops.h>
4e6045f1	11	#include <linux/lockdep.h>
a08727ba	12	#include <asm/atomic.h>
1da177e4 LT	13
	14	struct workqueue_struct;
	15
65f27f38 DH	16	struct work_struct;
65f27f38 DH	17	typedef void (work_func_t)(struct work_struct work);
6bb49e59	18
a08727ba LT	19	/*
	20	* The first word is the work queue pointer and the flags rolled into
	21	* one
	22	*/
	23	#define work_data_bits(work) ((unsigned long *)(&(work)->data))
	24
22df02bb TH	25	enum {
	26	WORK_STRUCT_PENDING_BIT = 0, /* work item is pending execution */
	27	#ifdef CONFIG_DEBUG_OBJECTS_WORK
	28	WORK_STRUCT_STATIC_BIT = 1, /* static initializer (debugobjects) */
73f53c4a	29	WORK_STRUCT_COLOR_SHIFT = 3, /* color for workqueue flushing */
0f900049	30	#else
73f53c4a	31	WORK_STRUCT_COLOR_SHIFT = 2, /* color for workqueue flushing */
22df02bb TH	32	#endif
22df02bb TH	33
73f53c4a TH	34	WORK_STRUCT_COLOR_BITS = 4,
73f53c4a TH	35
22df02bb TH	36	WORK_STRUCT_PENDING = 1 << WORK_STRUCT_PENDING_BIT,
	37	#ifdef CONFIG_DEBUG_OBJECTS_WORK
	38	WORK_STRUCT_STATIC = 1 << WORK_STRUCT_STATIC_BIT,
	39	#else
	40	WORK_STRUCT_STATIC = 0,
	41	#endif
	42
73f53c4a TH	43	/*
	44	* The last color is no color used for works which don't
	45	* participate in workqueue flushing.
	46	*/
	47	WORK_NR_COLORS = (1 << WORK_STRUCT_COLOR_BITS) - 1,
	48	WORK_NO_COLOR = WORK_NR_COLORS,
	49
	50	/*
	51	* Reserve 6 bits off of cwq pointer w/ debugobjects turned
	52	* off. This makes cwqs aligned to 64 bytes which isn't too
	53	* excessive while allowing 15 workqueue flush colors.
	54	*/
	55	WORK_STRUCT_FLAG_BITS = WORK_STRUCT_COLOR_SHIFT +
	56	WORK_STRUCT_COLOR_BITS,
	57
0f900049	58	WORK_STRUCT_FLAG_MASK = (1UL << WORK_STRUCT_FLAG_BITS) - 1,
22df02bb TH	59	WORK_STRUCT_WQ_DATA_MASK = ~WORK_STRUCT_FLAG_MASK,
	60	};
	61
1da177e4	62	struct work_struct {
a08727ba	63	atomic_long_t data;
1da177e4	64	struct list_head entry;
6bb49e59	65	work_func_t func;
4e6045f1 JB	66	#ifdef CONFIG_LOCKDEP
	67	struct lockdep_map lockdep_map;
	68	#endif
52bad64d DH	69	};
52bad64d DH	70
23b2e599	71	#define WORK_DATA_INIT() ATOMIC_LONG_INIT(0)
22df02bb	72	#define WORK_DATA_STATIC_INIT() ATOMIC_LONG_INIT(WORK_STRUCT_STATIC)
a08727ba	73
52bad64d DH	74	struct delayed_work {
52bad64d DH	75	struct work_struct work;
1da177e4 LT	76	struct timer_list timer;
	77	};
	78
bf6aede7 JD	79	static inline struct delayed_work to_delayed_work(struct work_struct work)
	80	{
	81	return container_of(work, struct delayed_work, work);
	82	}
	83
1fa44eca JB	84	struct execute_work {
	85	struct work_struct work;
	86	};
	87
4e6045f1 JB	88	#ifdef CONFIG_LOCKDEP
	89	/*
	90	* NB: because we have to copy the lockdep_map, setting _key
	91	* here is required, otherwise it could get initialised to the
	92	* copy of the lockdep_map!
	93	*/
	94	#define __WORK_INIT_LOCKDEP_MAP(n, k) \
	95	.lockdep_map = STATIC_LOCKDEP_MAP_INIT(n, k),
	96	#else
	97	#define __WORK_INIT_LOCKDEP_MAP(n, k)
	98	#endif
	99
65f27f38	100	#define __WORK_INITIALIZER(n, f) { \
dc186ad7	101	.data = WORK_DATA_STATIC_INIT(), \
23b2e599	102	.entry = { &(n).entry, &(n).entry }, \
65f27f38	103	.func = (f), \
4e6045f1	104	__WORK_INIT_LOCKDEP_MAP(#n, &(n)) \
65f27f38 DH	105	}
	106
	107	#define __DELAYED_WORK_INITIALIZER(n, f) { \
	108	.work = __WORK_INITIALIZER((n).work, (f)), \
	109	.timer = TIMER_INITIALIZER(NULL, 0, 0), \
	110	}
	111
65f27f38 DH	112	#define DECLARE_WORK(n, f) \
	113	struct work_struct n = __WORK_INITIALIZER(n, f)
	114
65f27f38 DH	115	#define DECLARE_DELAYED_WORK(n, f) \
	116	struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f)
	117
1da177e4	118	/*
65f27f38	119	* initialize a work item's function pointer
1da177e4	120	*/
65f27f38	121	#define PREPARE_WORK(_work, _func) \
1da177e4	122	do { \
52bad64d	123	(_work)->func = (_func); \
1da177e4 LT	124	} while (0)
1da177e4 LT	125
65f27f38 DH	126	#define PREPARE_DELAYED_WORK(_work, _func) \
65f27f38 DH	127	PREPARE_WORK(&(_work)->work, (_func))
52bad64d	128
dc186ad7 TG	129	#ifdef CONFIG_DEBUG_OBJECTS_WORK
	130	extern void __init_work(struct work_struct *work, int onstack);
	131	extern void destroy_work_on_stack(struct work_struct *work);
4690c4ab TH	132	static inline unsigned int work_static(struct work_struct *work)
4690c4ab TH	133	{
22df02bb	134	return *work_data_bits(work) & WORK_STRUCT_STATIC;
4690c4ab	135	}
dc186ad7 TG	136	#else
	137	static inline void __init_work(struct work_struct *work, int onstack) { }
	138	static inline void destroy_work_on_stack(struct work_struct *work) { }
4690c4ab	139	static inline unsigned int work_static(struct work_struct *work) { return 0; }
dc186ad7 TG	140	#endif
dc186ad7 TG	141
1da177e4	142	/*
52bad64d	143	* initialize all of a work item in one go
a08727ba	144	*
b9049df5	145	* NOTE! No point in using "atomic_long_set()": using a direct
a08727ba LT	146	* assignment of the work data initializer allows the compiler
a08727ba LT	147	* to generate better code.
1da177e4	148	*/
4e6045f1	149	#ifdef CONFIG_LOCKDEP
dc186ad7	150	#define __INIT_WORK(_work, _func, _onstack) \
65f27f38	151	do { \
4e6045f1 JB	152	static struct lock_class_key __key; \
4e6045f1 JB	153	\
dc186ad7	154	__init_work((_work), _onstack); \
23b2e599	155	(_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
4e6045f1	156	lockdep_init_map(&(_work)->lockdep_map, #_work, &__key, 0);\
65f27f38 DH	157	INIT_LIST_HEAD(&(_work)->entry); \
	158	PREPARE_WORK((_work), (_func)); \
	159	} while (0)
4e6045f1	160	#else
dc186ad7	161	#define __INIT_WORK(_work, _func, _onstack) \
4e6045f1	162	do { \
dc186ad7	163	__init_work((_work), _onstack); \
4e6045f1 JB	164	(_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
	165	INIT_LIST_HEAD(&(_work)->entry); \
	166	PREPARE_WORK((_work), (_func)); \
	167	} while (0)
	168	#endif
65f27f38	169
dc186ad7 TG	170	#define INIT_WORK(_work, _func) \
	171	do { \
	172	__INIT_WORK((_work), (_func), 0); \
	173	} while (0)
	174
	175	#define INIT_WORK_ON_STACK(_work, _func) \
	176	do { \
	177	__INIT_WORK((_work), (_func), 1); \
	178	} while (0)
	179
65f27f38 DH	180	#define INIT_DELAYED_WORK(_work, _func) \
	181	do { \
	182	INIT_WORK(&(_work)->work, (_func)); \
	183	init_timer(&(_work)->timer); \
52bad64d DH	184	} while (0)
52bad64d DH	185
6d612b0f PZ	186	#define INIT_DELAYED_WORK_ON_STACK(_work, _func) \
6d612b0f PZ	187	do { \
dc186ad7	188	INIT_WORK_ON_STACK(&(_work)->work, (_func)); \
6d612b0f PZ	189	init_timer_on_stack(&(_work)->timer); \
	190	} while (0)
	191
dc186ad7	192	#define INIT_DELAYED_WORK_DEFERRABLE(_work, _func) \
28287033 VP	193	do { \
	194	INIT_WORK(&(_work)->work, (_func)); \
	195	init_timer_deferrable(&(_work)->timer); \
	196	} while (0)
	197
365970a1 DH	198	/**
	199	* work_pending - Find out whether a work item is currently pending
	200	* @work: The work item in question
	201	*/
	202	#define work_pending(work) \
22df02bb	203	test_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
365970a1 DH	204
	205	/**
	206	* delayed_work_pending - Find out whether a delayable work item is currently
	207	* pending
	208	* @work: The work item in question
	209	*/
0221872a LT	210	#define delayed_work_pending(w) \
0221872a LT	211	work_pending(&(w)->work)
365970a1	212
65f27f38	213	/**
23b2e599 ON	214	* work_clear_pending - for internal use only, mark a work item as not pending
23b2e599 ON	215	* @work: The work item in question
65f27f38	216	*/
23b2e599	217	#define work_clear_pending(work) \
22df02bb	218	clear_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))
65f27f38	219
97e37d7b TH	220	enum {
	221	WQ_FREEZEABLE = 1 << 0, /* freeze during suspend */
	222	WQ_SINGLE_THREAD = 1 << 1, /* no per-cpu worker */
	223	};
52bad64d	224
4e6045f1	225	extern struct workqueue_struct *
97e37d7b	226	__create_workqueue_key(const char *name, unsigned int flags,
c790bce0	227	struct lock_class_key key, const char lock_name);
4e6045f1 JB	228
4e6045f1 JB	229	#ifdef CONFIG_LOCKDEP
97e37d7b	230	#define __create_workqueue(name, flags) \
4e6045f1 JB	231	({ \
4e6045f1 JB	232	static struct lock_class_key __key; \
eb13ba87 JB	233	const char *__lock_name; \
	234	\
	235	if (__builtin_constant_p(name)) \
	236	__lock_name = (name); \
	237	else \
	238	__lock_name = #name; \
4e6045f1	239	\
97e37d7b	240	__create_workqueue_key((name), (flags), &__key, \
eb13ba87	241	__lock_name); \
4e6045f1 JB	242	})
4e6045f1 JB	243	#else
97e37d7b TH	244	#define __create_workqueue(name, flags) \
97e37d7b TH	245	__create_workqueue_key((name), (flags), NULL, NULL)
4e6045f1 JB	246	#endif
4e6045f1 JB	247
97e37d7b TH	248	#define create_workqueue(name) \
	249	__create_workqueue((name), 0)
	250	#define create_freezeable_workqueue(name) \
	251	__create_workqueue((name), WQ_FREEZEABLE \| WQ_SINGLE_THREAD)
	252	#define create_singlethread_workqueue(name) \
	253	__create_workqueue((name), WQ_SINGLE_THREAD)
1da177e4 LT	254
	255	extern void destroy_workqueue(struct workqueue_struct *wq);
	256
b3c97528	257	extern int queue_work(struct workqueue_struct wq, struct work_struct work);
c1a220e7 ZR	258	extern int queue_work_on(int cpu, struct workqueue_struct *wq,
c1a220e7 ZR	259	struct work_struct *work);
b3c97528 HH	260	extern int queue_delayed_work(struct workqueue_struct *wq,
b3c97528 HH	261	struct delayed_work *work, unsigned long delay);
7a6bc1cd	262	extern int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
28e53bdd ON	263	struct delayed_work *work, unsigned long delay);
28e53bdd ON	264
b3c97528	265	extern void flush_workqueue(struct workqueue_struct *wq);
28e53bdd	266	extern void flush_scheduled_work(void);
43046b60	267	extern void flush_delayed_work(struct delayed_work *work);
1da177e4	268
b3c97528	269	extern int schedule_work(struct work_struct *work);
c1a220e7	270	extern int schedule_work_on(int cpu, struct work_struct *work);
b3c97528	271	extern int schedule_delayed_work(struct delayed_work *work, unsigned long delay);
28e53bdd ON	272	extern int schedule_delayed_work_on(int cpu, struct delayed_work *work,
28e53bdd ON	273	unsigned long delay);
65f27f38	274	extern int schedule_on_each_cpu(work_func_t func);
1da177e4 LT	275	extern int current_is_keventd(void);
	276	extern int keventd_up(void);
	277
	278	extern void init_workqueues(void);
65f27f38	279	int execute_in_process_context(work_func_t fn, struct execute_work *);
1da177e4	280
db700897 ON	281	extern int flush_work(struct work_struct *work);
db700897 ON	282
1f1f642e	283	extern int cancel_work_sync(struct work_struct *work);
28e53bdd	284
1da177e4 LT	285	/*
1da177e4 LT	286	* Kill off a pending schedule_delayed_work(). Note that the work callback
071b6386 ON	287	* function may still be running on return from cancel_delayed_work(), unless
071b6386 ON	288	* it returns 1 and the work doesn't re-arm itself. Run flush_workqueue() or
28e53bdd	289	* cancel_work_sync() to wait on it.
1da177e4	290	*/
52bad64d	291	static inline int cancel_delayed_work(struct delayed_work *work)
1da177e4 LT	292	{
	293	int ret;
	294
223a10a9	295	ret = del_timer_sync(&work->timer);
1da177e4	296	if (ret)
23b2e599	297	work_clear_pending(&work->work);
1da177e4 LT	298	return ret;
	299	}
	300
4e49627b ON	301	/*
	302	* Like above, but uses del_timer() instead of del_timer_sync(). This means,
	303	* if it returns 0 the timer function may be running and the queueing is in
	304	* progress.
	305	*/
	306	static inline int __cancel_delayed_work(struct delayed_work *work)
	307	{
	308	int ret;
	309
	310	ret = del_timer(&work->timer);
	311	if (ret)
	312	work_clear_pending(&work->work);
	313	return ret;
	314	}
	315
1f1f642e	316	extern int cancel_delayed_work_sync(struct delayed_work *work);
1634c48f	317
f5a421a4	318	/* Obsolete. use cancel_delayed_work_sync() */
1634c48f ON	319	static inline
	320	void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq,
	321	struct delayed_work *work)
	322	{
f5a421a4 ON	323	cancel_delayed_work_sync(work);
	324	}
	325
	326	/* Obsolete. use cancel_delayed_work_sync() */
	327	static inline
	328	void cancel_rearming_delayed_work(struct delayed_work *work)
	329	{
	330	cancel_delayed_work_sync(work);
1634c48f ON	331	}
1634c48f ON	332
2d3854a3 RR	333	#ifndef CONFIG_SMP
	334	static inline long work_on_cpu(unsigned int cpu, long (fn)(void ), void *arg)
	335	{
	336	return fn(arg);
	337	}
	338	#else
	339	long work_on_cpu(unsigned int cpu, long (fn)(void ), void *arg);
	340	#endif /* CONFIG_SMP */
1da177e4	341	#endif