[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / wait.h

#ifndef _LINUX_WAIT_H
#define _LINUX_WAIT_H

#define WNOHANG		0x00000001
#define WUNTRACED	0x00000002
#define WSTOPPED	WUNTRACED
#define WEXITED		0x00000004
#define WCONTINUED	0x00000008
#define WNOWAIT		0x01000000	/* Don't reap, just poll status.  */

#define __WNOTHREAD	0x20000000	/* Don't wait on children of other threads in this group */
#define __WALL		0x40000000	/* Wait on all children, regardless of type */
#define __WCLONE	0x80000000	/* Wait only on non-SIGCHLD children */

/* First argument to waitid: */
#define P_ALL		0
#define P_PID		1
#define P_PGID		2

#ifdef __KERNEL__

#include <linux/list.h>
#include <linux/stddef.h>
#include <linux/spinlock.h>
#include <asm/system.h>
#include <asm/current.h>

typedef struct __wait_queue wait_queue_t;
typedef int (*wait_queue_func_t)(wait_queue_t *wait, unsigned mode, int sync, void *key);
int default_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key);

struct __wait_queue {
	unsigned int flags;
#define WQ_FLAG_EXCLUSIVE	0x01
	void *private;
	wait_queue_func_t func;
	struct list_head task_list;
};

struct wait_bit_key {
	void *flags;
	int bit_nr;
};

struct wait_bit_queue {
	struct wait_bit_key key;
	wait_queue_t wait;
};

struct __wait_queue_head {
	spinlock_t lock;
	struct list_head task_list;
};
typedef struct __wait_queue_head wait_queue_head_t;

struct task_struct;

/*
 * Macros for declaration and initialisaton of the datatypes
 */

#define __WAITQUEUE_INITIALIZER(name, tsk) {				\
	.private	= tsk,						\
	.func		= default_wake_function,			\
	.task_list	= { NULL, NULL } }

#define DECLARE_WAITQUEUE(name, tsk)					\
	wait_queue_t name = __WAITQUEUE_INITIALIZER(name, tsk)

#define __WAIT_QUEUE_HEAD_INITIALIZER(name) {				\
	.lock		= __SPIN_LOCK_UNLOCKED(name.lock),		\
	.task_list	= { &(name).task_list, &(name).task_list } }

#define DECLARE_WAIT_QUEUE_HEAD(name) \
	wait_queue_head_t name = __WAIT_QUEUE_HEAD_INITIALIZER(name)

#define __WAIT_BIT_KEY_INITIALIZER(word, bit)				\
	{ .flags = word, .bit_nr = bit, }

extern void init_waitqueue_head(wait_queue_head_t *q);

#ifdef CONFIG_LOCKDEP
# define __WAIT_QUEUE_HEAD_INIT_ONSTACK(name) \
	({ init_waitqueue_head(&name); name; })
# define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) \
	wait_queue_head_t name = __WAIT_QUEUE_HEAD_INIT_ONSTACK(name)
#else
# define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) DECLARE_WAIT_QUEUE_HEAD(name)
#endif

static inline void init_waitqueue_entry(wait_queue_t *q, struct task_struct *p)
{
	q->flags = 0;
	q->private = p;
	q->func = default_wake_function;
}

static inline void init_waitqueue_func_entry(wait_queue_t *q,
					wait_queue_func_t func)
{
	q->flags = 0;
	q->private = NULL;
	q->func = func;
}

static inline int waitqueue_active(wait_queue_head_t *q)
{
	return !list_empty(&q->task_list);
}

extern void add_wait_queue(wait_queue_head_t *q, wait_queue_t *wait);
extern void add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t *wait);
extern void remove_wait_queue(wait_queue_head_t *q, wait_queue_t *wait);

static inline void __add_wait_queue(wait_queue_head_t *head, wait_queue_t *new)
{
	list_add(&new->task_list, &head->task_list);
}

/*
 * Used for wake-one threads:
 */
static inline void __add_wait_queue_tail(wait_queue_head_t *head,
						wait_queue_t *new)
{
	list_add_tail(&new->task_list, &head->task_list);
}

static inline void __remove_wait_queue(wait_queue_head_t *head,
							wait_queue_t *old)
{
	list_del(&old->task_list);
}

void __wake_up_common(wait_queue_head_t *q, unsigned int mode,
			int nr_exclusive, int sync, void *key);
void __wake_up(wait_queue_head_t *q, unsigned int mode, int nr, void *key);
extern void __wake_up_locked(wait_queue_head_t *q, unsigned int mode);
extern void __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr);
void __wake_up_bit(wait_queue_head_t *, void *, int);
int __wait_on_bit(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned);
int __wait_on_bit_lock(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned);
void wake_up_bit(void *, int);
int out_of_line_wait_on_bit(void *, int, int (*)(void *), unsigned);
int out_of_line_wait_on_bit_lock(void *, int, int (*)(void *), unsigned);
wait_queue_head_t *bit_waitqueue(void *, int);

#define wake_up(x)			__wake_up(x, TASK_NORMAL, 1, NULL)
#define wake_up_nr(x, nr)		__wake_up(x, TASK_NORMAL, nr, NULL)
#define wake_up_all(x)			__wake_up(x, TASK_NORMAL, 0, NULL)
#define wake_up_locked(x)		__wake_up_locked((x), TASK_NORMAL)

#define wake_up_interruptible(x)	__wake_up(x, TASK_INTERRUPTIBLE, 1, NULL)
#define wake_up_interruptible_nr(x, nr)	__wake_up(x, TASK_INTERRUPTIBLE, nr, NULL)
#define wake_up_interruptible_all(x)	__wake_up(x, TASK_INTERRUPTIBLE, 0, NULL)
#define wake_up_interruptible_sync(x)	__wake_up_sync((x), TASK_INTERRUPTIBLE, 1)

#ifdef CONFIG_DEBUG_LOCK_ALLOC
/*
 * macro to avoid include hell
 */
#define wake_up_nested(x, s)						\
do {									\
	unsigned long flags;						\
									\
	spin_lock_irqsave_nested(&(x)->lock, flags, (s));		\
	wake_up_locked(x); 						\
	spin_unlock_irqrestore(&(x)->lock, flags);			\
} while (0)
#else
#define wake_up_nested(x, s)		wake_up(x)
#endif

#define __wait_event(wq, condition) 					\
do {									\
	DEFINE_WAIT(__wait);						\
									\
	for (;;) {							\
		prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE);	\
		if (condition)						\
			break;						\
		schedule();						\
	}								\
	finish_wait(&wq, &__wait);					\
} while (0)

/**
 * wait_event - sleep until a condition gets true
 * @wq: the waitqueue to wait on
 * @condition: a C expression for the event to wait for
 *
 * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
 * @condition evaluates to true. The @condition is checked each time
 * the waitqueue @wq is woken up.
 *
 * wake_up() has to be called after changing any variable that could
 * change the result of the wait condition.
 */
#define wait_event(wq, condition) 					\
do {									\
	if (condition)	 						\
		break;							\
	__wait_event(wq, condition);					\
} while (0)

#define __wait_event_timeout(wq, condition, ret)			\
do {									\
	DEFINE_WAIT(__wait);						\
									\
	for (;;) {							\
		prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE);	\
		if (condition)						\
			break;						\
		ret = schedule_timeout(ret);				\
		if (!ret)						\
			break;						\
	}								\
	finish_wait(&wq, &__wait);					\
} while (0)

/**
 * wait_event_timeout - sleep until a condition gets true or a timeout elapses
 * @wq: the waitqueue to wait on
 * @condition: a C expression for the event to wait for
 * @timeout: timeout, in jiffies
 *
 * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
 * @condition evaluates to true. The @condition is checked each time
 * the waitqueue @wq is woken up.
 *
 * wake_up() has to be called after changing any variable that could
 * change the result of the wait condition.
 *
 * The function returns 0 if the @timeout elapsed, and the remaining
 * jiffies if the condition evaluated to true before the timeout elapsed.
 */
#define wait_event_timeout(wq, condition, timeout)			\
({									\
	long __ret = timeout;						\
	if (!(condition)) 						\
		__wait_event_timeout(wq, condition, __ret);		\
	__ret;								\
})

#define __wait_event_interruptible(wq, condition, ret)			\
do {									\
	DEFINE_WAIT(__wait);						\
									\
	for (;;) {							\
		prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);	\
		if (condition)						\
			break;						\
		if (!signal_pending(current)) {				\
			schedule();					\
			continue;					\
		}							\
		ret = -ERESTARTSYS;					\
		break;							\
	}								\
	finish_wait(&wq, &__wait);					\
} while (0)

/**
 * wait_event_interruptible - sleep until a condition gets true
 * @wq: the waitqueue to wait on
 * @condition: a C expression for the event to wait for
 *
 * The process is put to sleep (TASK_INTERRUPTIBLE) until the
 * @condition evaluates to true or a signal is received.
 * The @condition is checked each time the waitqueue @wq is woken up.
 *
 * wake_up() has to be called after changing any variable that could
 * change the result of the wait condition.
 *
 * The function will return -ERESTARTSYS if it was interrupted by a
 * signal and 0 if @condition evaluated to true.
 */
#define wait_event_interruptible(wq, condition)				\
({									\
	int __ret = 0;							\
	if (!(condition))						\
		__wait_event_interruptible(wq, condition, __ret);	\
	__ret;								\
})

#define __wait_event_interruptible_timeout(wq, condition, ret)		\
do {									\
	DEFINE_WAIT(__wait);						\
									\
	for (;;) {							\
		prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);	\
		if (condition)						\
			break;						\
		if (!signal_pending(current)) {				\
			ret = schedule_timeout(ret);			\
			if (!ret)					\
				break;					\
			continue;					\
		}							\
		ret = -ERESTARTSYS;					\
		break;							\
	}								\
	finish_wait(&wq, &__wait);					\
} while (0)

/**
 * wait_event_interruptible_timeout - sleep until a condition gets true or a timeout elapses
 * @wq: the waitqueue to wait on
 * @condition: a C expression for the event to wait for
 * @timeout: timeout, in jiffies
 *
 * The process is put to sleep (TASK_INTERRUPTIBLE) until the
 * @condition evaluates to true or a signal is received.
 * The @condition is checked each time the waitqueue @wq is woken up.
 *
 * wake_up() has to be called after changing any variable that could
 * change the result of the wait condition.
 *
 * The function returns 0 if the @timeout elapsed, -ERESTARTSYS if it
 * was interrupted by a signal, and the remaining jiffies otherwise
 * if the condition evaluated to true before the timeout elapsed.
 */
#define wait_event_interruptible_timeout(wq, condition, timeout)	\
({									\
	long __ret = timeout;						\
	if (!(condition))						\
		__wait_event_interruptible_timeout(wq, condition, __ret); \
	__ret;								\
})

#define __wait_event_interruptible_exclusive(wq, condition, ret)	\
do {									\
	DEFINE_WAIT(__wait);						\
									\
	for (;;) {							\
		prepare_to_wait_exclusive(&wq, &__wait,			\
					TASK_INTERRUPTIBLE);		\
		if (condition) {					\
			finish_wait(&wq, &__wait);			\
			break;						\
		}							\
		if (!signal_pending(current)) {				\
			schedule();					\
			continue;					\
		}							\
		ret = -ERESTARTSYS;					\
		abort_exclusive_wait(&wq, &__wait, 			\
				TASK_INTERRUPTIBLE, NULL);		\
		break;							\
	}								\
} while (0)

#define wait_event_interruptible_exclusive(wq, condition)		\
({									\
	int __ret = 0;							\
	if (!(condition))						\
		__wait_event_interruptible_exclusive(wq, condition, __ret);\
	__ret;								\
})

#define __wait_event_killable(wq, condition, ret)			\
do {									\
	DEFINE_WAIT(__wait);						\
									\
	for (;;) {							\
		prepare_to_wait(&wq, &__wait, TASK_KILLABLE);		\
		if (condition)						\
			break;						\
		if (!fatal_signal_pending(current)) {			\
			schedule();					\
			continue;					\
		}							\
		ret = -ERESTARTSYS;					\
		break;							\
	}								\
	finish_wait(&wq, &__wait);					\
} while (0)

/**
 * wait_event_killable - sleep until a condition gets true
 * @wq: the waitqueue to wait on
 * @condition: a C expression for the event to wait for
 *
 * The process is put to sleep (TASK_KILLABLE) until the
 * @condition evaluates to true or a signal is received.
 * The @condition is checked each time the waitqueue @wq is woken up.
 *
 * wake_up() has to be called after changing any variable that could
 * change the result of the wait condition.
 *
 * The function will return -ERESTARTSYS if it was interrupted by a
 * signal and 0 if @condition evaluated to true.
 */
#define wait_event_killable(wq, condition)				\
({									\
	int __ret = 0;							\
	if (!(condition))						\
		__wait_event_killable(wq, condition, __ret);		\
	__ret;								\
})

/*
 * Must be called with the spinlock in the wait_queue_head_t held.
 */
static inline void add_wait_queue_exclusive_locked(wait_queue_head_t *q,
						   wait_queue_t * wait)
{
	wait->flags |= WQ_FLAG_EXCLUSIVE;
	__add_wait_queue_tail(q,  wait);
}

/*
 * Must be called with the spinlock in the wait_queue_head_t held.
 */
static inline void remove_wait_queue_locked(wait_queue_head_t *q,
					    wait_queue_t * wait)
{
	__remove_wait_queue(q,  wait);
}

/*
 * These are the old interfaces to sleep waiting for an event.
 * They are racy.  DO NOT use them, use the wait_event* interfaces above.
 * We plan to remove these interfaces.
 */
extern void sleep_on(wait_queue_head_t *q);
extern long sleep_on_timeout(wait_queue_head_t *q,
				      signed long timeout);
extern void interruptible_sleep_on(wait_queue_head_t *q);
extern long interruptible_sleep_on_timeout(wait_queue_head_t *q,
					   signed long timeout);

/*
 * Waitqueues which are removed from the waitqueue_head at wakeup time
 */
void prepare_to_wait(wait_queue_head_t *q, wait_queue_t *wait, int state);
void prepare_to_wait_exclusive(wait_queue_head_t *q, wait_queue_t *wait, int state);
void finish_wait(wait_queue_head_t *q, wait_queue_t *wait);
void abort_exclusive_wait(wait_queue_head_t *q, wait_queue_t *wait,
			unsigned int mode, void *key);
int autoremove_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
int wake_bit_function(wait_queue_t *wait, unsigned mode, int sync, void *key);

#define DEFINE_WAIT(name)						\
	wait_queue_t name = {						\
		.private	= current,				\
		.func		= autoremove_wake_function,		\
		.task_list	= LIST_HEAD_INIT((name).task_list),	\
	}

#define DEFINE_WAIT_BIT(name, word, bit)				\
	struct wait_bit_queue name = {					\
		.key = __WAIT_BIT_KEY_INITIALIZER(word, bit),		\
		.wait	= {						\
			.private	= current,			\
			.func		= wake_bit_function,		\
			.task_list	=				\
				LIST_HEAD_INIT((name).wait.task_list),	\
		},							\
	}

#define init_wait(wait)							\
	do {								\
		(wait)->private = current;				\
		(wait)->func = autoremove_wake_function;		\
		INIT_LIST_HEAD(&(wait)->task_list);			\
	} while (0)

/**
 * wait_on_bit - wait for a bit to be cleared
 * @word: the word being waited on, a kernel virtual address
 * @bit: the bit of the word being waited on
 * @action: the function used to sleep, which may take special actions
 * @mode: the task state to sleep in
 *
 * There is a standard hashed waitqueue table for generic use. This
 * is the part of the hashtable's accessor API that waits on a bit.
 * For instance, if one were to have waiters on a bitflag, one would
 * call wait_on_bit() in threads waiting for the bit to clear.
 * One uses wait_on_bit() where one is waiting for the bit to clear,
 * but has no intention of setting it.
 */
static inline int wait_on_bit(void *word, int bit,
				int (*action)(void *), unsigned mode)
{
	if (!test_bit(bit, word))
		return 0;
	return out_of_line_wait_on_bit(word, bit, action, mode);
}

/**
 * wait_on_bit_lock - wait for a bit to be cleared, when wanting to set it
 * @word: the word being waited on, a kernel virtual address
 * @bit: the bit of the word being waited on
 * @action: the function used to sleep, which may take special actions
 * @mode: the task state to sleep in
 *
 * There is a standard hashed waitqueue table for generic use. This
 * is the part of the hashtable's accessor API that waits on a bit
 * when one intends to set it, for instance, trying to lock bitflags.
 * For instance, if one were to have waiters trying to set bitflag
 * and waiting for it to clear before setting it, one would call
 * wait_on_bit() in threads waiting to be able to set the bit.
 * One uses wait_on_bit_lock() where one is waiting for the bit to
 * clear with the intention of setting it, and when done, clearing it.
 */
static inline int wait_on_bit_lock(void *word, int bit,
				int (*action)(void *), unsigned mode)
{
	if (!test_and_set_bit(bit, word))
		return 0;
	return out_of_line_wait_on_bit_lock(word, bit, action, mode);
}
	
#endif /* __KERNEL__ */

#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_WAIT_H
	2	#define _LINUX_WAIT_H
	3
	4	#define WNOHANG 0x00000001
	5	#define WUNTRACED 0x00000002
	6	#define WSTOPPED WUNTRACED
	7	#define WEXITED 0x00000004
	8	#define WCONTINUED 0x00000008
	9	#define WNOWAIT 0x01000000 /* Don't reap, just poll status. */
	10
	11	#define __WNOTHREAD 0x20000000 /* Don't wait on children of other threads in this group */
	12	#define __WALL 0x40000000 /* Wait on all children, regardless of type */
	13	#define __WCLONE 0x80000000 /* Wait only on non-SIGCHLD children */
	14
	15	/* First argument to waitid: */
	16	#define P_ALL 0
	17	#define P_PID 1
	18	#define P_PGID 2
	19
	20	#ifdef __KERNEL__
	21
1da177e4 LT	22	#include <linux/list.h>
	23	#include <linux/stddef.h>
	24	#include <linux/spinlock.h>
	25	#include <asm/system.h>
	26	#include <asm/current.h>
	27
	28	typedef struct __wait_queue wait_queue_t;
	29	typedef int (wait_queue_func_t)(wait_queue_t wait, unsigned mode, int sync, void *key);
	30	int default_wake_function(wait_queue_t wait, unsigned mode, int sync, void key);
	31
	32	struct __wait_queue {
	33	unsigned int flags;
	34	#define WQ_FLAG_EXCLUSIVE 0x01
c43dc2fd	35	void *private;
1da177e4 LT	36	wait_queue_func_t func;
	37	struct list_head task_list;
	38	};
	39
	40	struct wait_bit_key {
	41	void *flags;
	42	int bit_nr;
	43	};
	44
	45	struct wait_bit_queue {
	46	struct wait_bit_key key;
	47	wait_queue_t wait;
	48	};
	49
	50	struct __wait_queue_head {
	51	spinlock_t lock;
	52	struct list_head task_list;
	53	};
	54	typedef struct __wait_queue_head wait_queue_head_t;
	55
8c65b4a6	56	struct task_struct;
1da177e4 LT	57
	58	/*
	59	* Macros for declaration and initialisaton of the datatypes
	60	*/
	61
	62	#define __WAITQUEUE_INITIALIZER(name, tsk) { \
c43dc2fd	63	.private = tsk, \
1da177e4 LT	64	.func = default_wake_function, \
	65	.task_list = { NULL, NULL } }
	66
	67	#define DECLARE_WAITQUEUE(name, tsk) \
	68	wait_queue_t name = __WAITQUEUE_INITIALIZER(name, tsk)
	69
	70	#define __WAIT_QUEUE_HEAD_INITIALIZER(name) { \
e4d91918	71	.lock = __SPIN_LOCK_UNLOCKED(name.lock), \
1da177e4 LT	72	.task_list = { &(name).task_list, &(name).task_list } }
	73
	74	#define DECLARE_WAIT_QUEUE_HEAD(name) \
	75	wait_queue_head_t name = __WAIT_QUEUE_HEAD_INITIALIZER(name)
	76
	77	#define __WAIT_BIT_KEY_INITIALIZER(word, bit) \
	78	{ .flags = word, .bit_nr = bit, }
	79
21d71f51	80	extern void init_waitqueue_head(wait_queue_head_t *q);
1da177e4	81
7259f0d0 PZ	82	#ifdef CONFIG_LOCKDEP
	83	# define __WAIT_QUEUE_HEAD_INIT_ONSTACK(name) \
	84	({ init_waitqueue_head(&name); name; })
	85	# define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) \
	86	wait_queue_head_t name = __WAIT_QUEUE_HEAD_INIT_ONSTACK(name)
	87	#else
	88	# define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) DECLARE_WAIT_QUEUE_HEAD(name)
	89	#endif
	90
1da177e4 LT	91	static inline void init_waitqueue_entry(wait_queue_t q, struct task_struct p)
	92	{
	93	q->flags = 0;
c43dc2fd	94	q->private = p;
1da177e4 LT	95	q->func = default_wake_function;
	96	}
	97
	98	static inline void init_waitqueue_func_entry(wait_queue_t *q,
	99	wait_queue_func_t func)
	100	{
	101	q->flags = 0;
c43dc2fd	102	q->private = NULL;
1da177e4 LT	103	q->func = func;
	104	}
	105
	106	static inline int waitqueue_active(wait_queue_head_t *q)
	107	{
	108	return !list_empty(&q->task_list);
	109	}
	110
b3c97528 HH	111	extern void add_wait_queue(wait_queue_head_t q, wait_queue_t wait);
	112	extern void add_wait_queue_exclusive(wait_queue_head_t q, wait_queue_t wait);
	113	extern void remove_wait_queue(wait_queue_head_t q, wait_queue_t wait);
1da177e4 LT	114
	115	static inline void __add_wait_queue(wait_queue_head_t head, wait_queue_t new)
	116	{
	117	list_add(&new->task_list, &head->task_list);
	118	}
	119
	120	/*
	121	* Used for wake-one threads:
	122	*/
	123	static inline void __add_wait_queue_tail(wait_queue_head_t *head,
	124	wait_queue_t *new)
	125	{
	126	list_add_tail(&new->task_list, &head->task_list);
	127	}
	128
	129	static inline void __remove_wait_queue(wait_queue_head_t *head,
	130	wait_queue_t *old)
	131	{
	132	list_del(&old->task_list);
	133	}
	134
777c6c5f JW	135	void __wake_up_common(wait_queue_head_t *q, unsigned int mode,
777c6c5f JW	136	int nr_exclusive, int sync, void *key);
b3c97528 HH	137	void __wake_up(wait_queue_head_t q, unsigned int mode, int nr, void key);
	138	extern void __wake_up_locked(wait_queue_head_t *q, unsigned int mode);
	139	extern void __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr);
	140	void __wake_up_bit(wait_queue_head_t , void , int);
	141	int __wait_on_bit(wait_queue_head_t , struct wait_bit_queue , int ()(void ), unsigned);
	142	int __wait_on_bit_lock(wait_queue_head_t , struct wait_bit_queue , int ()(void ), unsigned);
	143	void wake_up_bit(void *, int);
	144	int out_of_line_wait_on_bit(void , int, int ()(void *), unsigned);
	145	int out_of_line_wait_on_bit_lock(void , int, int ()(void *), unsigned);
	146	wait_queue_head_t bit_waitqueue(void , int);
1da177e4	147
e64d66c8 MW	148	#define wake_up(x) __wake_up(x, TASK_NORMAL, 1, NULL)
	149	#define wake_up_nr(x, nr) __wake_up(x, TASK_NORMAL, nr, NULL)
	150	#define wake_up_all(x) __wake_up(x, TASK_NORMAL, 0, NULL)
	151	#define wake_up_locked(x) __wake_up_locked((x), TASK_NORMAL)
	152
1da177e4 LT	153	#define wake_up_interruptible(x) __wake_up(x, TASK_INTERRUPTIBLE, 1, NULL)
	154	#define wake_up_interruptible_nr(x, nr) __wake_up(x, TASK_INTERRUPTIBLE, nr, NULL)
	155	#define wake_up_interruptible_all(x) __wake_up(x, TASK_INTERRUPTIBLE, 0, NULL)
e64d66c8	156	#define wake_up_interruptible_sync(x) __wake_up_sync((x), TASK_INTERRUPTIBLE, 1)
1da177e4	157
0ccf831c PZ	158	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	159	/*
	160	* macro to avoid include hell
	161	*/
	162	#define wake_up_nested(x, s) \
	163	do { \
	164	unsigned long flags; \
	165	\
	166	spin_lock_irqsave_nested(&(x)->lock, flags, (s)); \
	167	wake_up_locked(x); \
	168	spin_unlock_irqrestore(&(x)->lock, flags); \
	169	} while (0)
	170	#else
	171	#define wake_up_nested(x, s) wake_up(x)
	172	#endif
	173
1da177e4 LT	174	#define __wait_event(wq, condition) \
	175	do { \
	176	DEFINE_WAIT(__wait); \
	177	\
	178	for (;;) { \
	179	prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE); \
	180	if (condition) \
	181	break; \
	182	schedule(); \
	183	} \
	184	finish_wait(&wq, &__wait); \
	185	} while (0)
	186
	187	/**
	188	* wait_event - sleep until a condition gets true
	189	* @wq: the waitqueue to wait on
	190	* @condition: a C expression for the event to wait for
	191	*
	192	* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
	193	* @condition evaluates to true. The @condition is checked each time
	194	* the waitqueue @wq is woken up.
	195	*
	196	* wake_up() has to be called after changing any variable that could
	197	* change the result of the wait condition.
	198	*/
	199	#define wait_event(wq, condition) \
	200	do { \
	201	if (condition) \
	202	break; \
	203	__wait_event(wq, condition); \
	204	} while (0)
	205
	206	#define __wait_event_timeout(wq, condition, ret) \
	207	do { \
	208	DEFINE_WAIT(__wait); \
	209	\
	210	for (;;) { \
	211	prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE); \
	212	if (condition) \
	213	break; \
	214	ret = schedule_timeout(ret); \
	215	if (!ret) \
	216	break; \
	217	} \
	218	finish_wait(&wq, &__wait); \
	219	} while (0)
	220
	221	/**
	222	* wait_event_timeout - sleep until a condition gets true or a timeout elapses
	223	* @wq: the waitqueue to wait on
	224	* @condition: a C expression for the event to wait for
	225	* @timeout: timeout, in jiffies
	226	*
	227	* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
	228	* @condition evaluates to true. The @condition is checked each time
	229	* the waitqueue @wq is woken up.
	230	*
	231	* wake_up() has to be called after changing any variable that could
	232	* change the result of the wait condition.
	233	*
	234	* The function returns 0 if the @timeout elapsed, and the remaining
	235	* jiffies if the condition evaluated to true before the timeout elapsed.
	236	*/
	237	#define wait_event_timeout(wq, condition, timeout) \
238	({ \
239	long __ret = timeout; \
240	if (!(condition)) \
241	__wait_event_timeout(wq, condition, __ret); \
242	__ret; \
243	})
244
245	#define __wait_event_interruptible(wq, condition, ret) \
246	do { \
247	DEFINE_WAIT(__wait); \
248	\
249	for (;;) { \
250	prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
251	if (condition) \
252	break; \
253	if (!signal_pending(current)) { \
254	schedule(); \
255	continue; \
256	} \
257	ret = -ERESTARTSYS; \
258	break; \
259	} \
260	finish_wait(&wq, &__wait); \
261	} while (0)
262
263	/**
264	* wait_event_interruptible - sleep until a condition gets true
265	* @wq: the waitqueue to wait on
266	* @condition: a C expression for the event to wait for
267	*
268	* The process is put to sleep (TASK_INTERRUPTIBLE) until the
269	* @condition evaluates to true or a signal is received.
270	* The @condition is checked each time the waitqueue @wq is woken up.
271	*
272	* wake_up() has to be called after changing any variable that could
273	* change the result of the wait condition.
274	*
275	* The function will return -ERESTARTSYS if it was interrupted by a
276	* signal and 0 if @condition evaluated to true.
277	*/
278	#define wait_event_interruptible(wq, condition) \
279	({ \
280	int __ret = 0; \
281	if (!(condition)) \
282	__wait_event_interruptible(wq, condition, __ret); \
283	__ret; \
284	})
285
286	#define __wait_event_interruptible_timeout(wq, condition, ret) \
287	do { \
288	DEFINE_WAIT(__wait); \
289	\
290	for (;;) { \
291	prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
292	if (condition) \
293	break; \
294	if (!signal_pending(current)) { \
295	ret = schedule_timeout(ret); \
296	if (!ret) \
297	break; \
298	continue; \
299	} \
300	ret = -ERESTARTSYS; \
301	break; \
302	} \
303	finish_wait(&wq, &__wait); \
304	} while (0)
305
306	/**
307	* wait_event_interruptible_timeout - sleep until a condition gets true or a timeout elapses
308	* @wq: the waitqueue to wait on
309	* @condition: a C expression for the event to wait for
310	* @timeout: timeout, in jiffies
311	*
312	* The process is put to sleep (TASK_INTERRUPTIBLE) until the
313	* @condition evaluates to true or a signal is received.
314	* The @condition is checked each time the waitqueue @wq is woken up.
315	*
316	* wake_up() has to be called after changing any variable that could
317	* change the result of the wait condition.
318	*
319	* The function returns 0 if the @timeout elapsed, -ERESTARTSYS if it
320	* was interrupted by a signal, and the remaining jiffies otherwise
321	* if the condition evaluated to true before the timeout elapsed.
322	*/
323	#define wait_event_interruptible_timeout(wq, condition, timeout) \
324	({ \
325	long __ret = timeout; \
326	if (!(condition)) \
327	__wait_event_interruptible_timeout(wq, condition, __ret); \
328	__ret; \
329	})
330
331	#define __wait_event_interruptible_exclusive(wq, condition, ret) \
332	do { \
333	DEFINE_WAIT(__wait); \
334	\
335	for (;;) { \
336	prepare_to_wait_exclusive(&wq, &__wait, \
337	TASK_INTERRUPTIBLE); \
777c6c5f JW	338	if (condition) { \
777c6c5f JW	339	finish_wait(&wq, &__wait); \
1da177e4	340	break; \
777c6c5f	341	} \
1da177e4 LT	342	if (!signal_pending(current)) { \
	343	schedule(); \
	344	continue; \
	345	} \
	346	ret = -ERESTARTSYS; \
777c6c5f JW	347	abort_exclusive_wait(&wq, &__wait, \
777c6c5f JW	348	TASK_INTERRUPTIBLE, NULL); \
1da177e4 LT	349	break; \
1da177e4 LT	350	} \
1da177e4 LT	351	} while (0)
	352
	353	#define wait_event_interruptible_exclusive(wq, condition) \
	354	({ \
	355	int __ret = 0; \
	356	if (!(condition)) \
	357	__wait_event_interruptible_exclusive(wq, condition, __ret);\
	358	__ret; \
	359	})
	360
1411d5a7 MW	361	#define __wait_event_killable(wq, condition, ret) \
	362	do { \
	363	DEFINE_WAIT(__wait); \
	364	\
	365	for (;;) { \
	366	prepare_to_wait(&wq, &__wait, TASK_KILLABLE); \
	367	if (condition) \
	368	break; \
	369	if (!fatal_signal_pending(current)) { \
	370	schedule(); \
	371	continue; \
	372	} \
	373	ret = -ERESTARTSYS; \
	374	break; \
	375	} \
	376	finish_wait(&wq, &__wait); \
	377	} while (0)
	378
	379	/**
	380	* wait_event_killable - sleep until a condition gets true
	381	* @wq: the waitqueue to wait on
	382	* @condition: a C expression for the event to wait for
	383	*
	384	* The process is put to sleep (TASK_KILLABLE) until the
	385	* @condition evaluates to true or a signal is received.
	386	* The @condition is checked each time the waitqueue @wq is woken up.
	387	*
	388	* wake_up() has to be called after changing any variable that could
	389	* change the result of the wait condition.
	390	*
	391	* The function will return -ERESTARTSYS if it was interrupted by a
	392	* signal and 0 if @condition evaluated to true.
	393	*/
	394	#define wait_event_killable(wq, condition) \
	395	({ \
	396	int __ret = 0; \
	397	if (!(condition)) \
	398	__wait_event_killable(wq, condition, __ret); \
	399	__ret; \
	400	})
	401
1da177e4 LT	402	/*
	403	* Must be called with the spinlock in the wait_queue_head_t held.
	404	*/
	405	static inline void add_wait_queue_exclusive_locked(wait_queue_head_t *q,
	406	wait_queue_t * wait)
	407	{
	408	wait->flags \|= WQ_FLAG_EXCLUSIVE;
	409	__add_wait_queue_tail(q, wait);
	410	}
	411
	412	/*
	413	* Must be called with the spinlock in the wait_queue_head_t held.
	414	*/
	415	static inline void remove_wait_queue_locked(wait_queue_head_t *q,
	416	wait_queue_t * wait)
	417	{
	418	__remove_wait_queue(q, wait);
	419	}
	420
	421	/*
	422	* These are the old interfaces to sleep waiting for an event.
0fec171c IM	423	* They are racy. DO NOT use them, use the wait_event* interfaces above.
0fec171c IM	424	* We plan to remove these interfaces.
1da177e4	425	*/
0fec171c IM	426	extern void sleep_on(wait_queue_head_t *q);
	427	extern long sleep_on_timeout(wait_queue_head_t *q,
	428	signed long timeout);
	429	extern void interruptible_sleep_on(wait_queue_head_t *q);
	430	extern long interruptible_sleep_on_timeout(wait_queue_head_t *q,
	431	signed long timeout);
1da177e4 LT	432
	433	/*
	434	* Waitqueues which are removed from the waitqueue_head at wakeup time
	435	*/
b3c97528 HH	436	void prepare_to_wait(wait_queue_head_t q, wait_queue_t wait, int state);
	437	void prepare_to_wait_exclusive(wait_queue_head_t q, wait_queue_t wait, int state);
	438	void finish_wait(wait_queue_head_t q, wait_queue_t wait);
777c6c5f JW	439	void abort_exclusive_wait(wait_queue_head_t q, wait_queue_t wait,
777c6c5f JW	440	unsigned int mode, void *key);
1da177e4 LT	441	int autoremove_wake_function(wait_queue_t wait, unsigned mode, int sync, void key);
	442	int wake_bit_function(wait_queue_t wait, unsigned mode, int sync, void key);
	443
	444	#define DEFINE_WAIT(name) \
	445	wait_queue_t name = { \
c43dc2fd	446	.private = current, \
1da177e4	447	.func = autoremove_wake_function, \
7e43c84e	448	.task_list = LIST_HEAD_INIT((name).task_list), \
1da177e4 LT	449	}
	450
	451	#define DEFINE_WAIT_BIT(name, word, bit) \
	452	struct wait_bit_queue name = { \
	453	.key = __WAIT_BIT_KEY_INITIALIZER(word, bit), \
	454	.wait = { \
c43dc2fd	455	.private = current, \
1da177e4 LT	456	.func = wake_bit_function, \
	457	.task_list = \
	458	LIST_HEAD_INIT((name).wait.task_list), \
	459	}, \
	460	}
	461
	462	#define init_wait(wait) \
	463	do { \
c43dc2fd	464	(wait)->private = current; \
1da177e4 LT	465	(wait)->func = autoremove_wake_function; \
	466	INIT_LIST_HEAD(&(wait)->task_list); \
	467	} while (0)
	468
	469	/**
	470	* wait_on_bit - wait for a bit to be cleared
	471	* @word: the word being waited on, a kernel virtual address
	472	* @bit: the bit of the word being waited on
	473	* @action: the function used to sleep, which may take special actions
	474	* @mode: the task state to sleep in
	475	*
	476	* There is a standard hashed waitqueue table for generic use. This
	477	* is the part of the hashtable's accessor API that waits on a bit.
	478	* For instance, if one were to have waiters on a bitflag, one would
	479	* call wait_on_bit() in threads waiting for the bit to clear.
	480	* One uses wait_on_bit() where one is waiting for the bit to clear,
	481	* but has no intention of setting it.
	482	*/
	483	static inline int wait_on_bit(void *word, int bit,
	484	int (action)(void ), unsigned mode)
	485	{
	486	if (!test_bit(bit, word))
	487	return 0;
	488	return out_of_line_wait_on_bit(word, bit, action, mode);
	489	}
	490
	491	/**
	492	* wait_on_bit_lock - wait for a bit to be cleared, when wanting to set it
	493	* @word: the word being waited on, a kernel virtual address
	494	* @bit: the bit of the word being waited on
	495	* @action: the function used to sleep, which may take special actions
	496	* @mode: the task state to sleep in
	497	*
	498	* There is a standard hashed waitqueue table for generic use. This
	499	* is the part of the hashtable's accessor API that waits on a bit
	500	* when one intends to set it, for instance, trying to lock bitflags.
	501	* For instance, if one were to have waiters trying to set bitflag
	502	* and waiting for it to clear before setting it, one would call
	503	* wait_on_bit() in threads waiting to be able to set the bit.
	504	* One uses wait_on_bit_lock() where one is waiting for the bit to
	505	* clear with the intention of setting it, and when done, clearing it.
	506	*/
	507	static inline int wait_on_bit_lock(void *word, int bit,
	508	int (action)(void ), unsigned mode)
	509	{
	510	if (!test_and_set_bit(bit, word))
	511	return 0;
	512	return out_of_line_wait_on_bit_lock(word, bit, action, mode);
	513	}
	514
	515	#endif /* __KERNEL__ */
	516
	517	#endif