1#ifndef _LINUX_WAIT_H
2#define _LINUX_WAIT_H
3
4
5
6#include <linux/list.h>
7#include <linux/stddef.h>
8#include <linux/spinlock.h>
9#include <asm/current.h>
10#include <uapi/linux/wait.h>
11
12typedef struct __wait_queue wait_queue_t;
13typedef int (*wait_queue_func_t)(wait_queue_t *wait, unsigned mode, int flags, void *key);
14int default_wake_function(wait_queue_t *wait, unsigned mode, int flags, void *key);
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16
17#define WQ_FLAG_EXCLUSIVE 0x01
18#define WQ_FLAG_WOKEN 0x02
19
20struct __wait_queue {
21 unsigned int flags;
22 void *private;
23 wait_queue_func_t func;
24 struct list_head task_list;
25};
26
27struct wait_bit_key {
28 void *flags;
29 int bit_nr;
30#define WAIT_ATOMIC_T_BIT_NR -1
31 unsigned long timeout;
32};
33
34struct wait_bit_queue {
35 struct wait_bit_key key;
36 wait_queue_t wait;
37};
38
39struct __wait_queue_head {
40 spinlock_t lock;
41 struct list_head task_list;
42};
43typedef struct __wait_queue_head wait_queue_head_t;
44
45struct task_struct;
46
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50
51#define __WAITQUEUE_INITIALIZER(name, tsk) { \
52 .private = tsk, \
53 .func = default_wake_function, \
54 .task_list = { NULL, NULL } }
55
56#define DECLARE_WAITQUEUE(name, tsk) \
57 wait_queue_t name = __WAITQUEUE_INITIALIZER(name, tsk)
58
59#define __WAIT_QUEUE_HEAD_INITIALIZER(name) { \
60 .lock = __SPIN_LOCK_UNLOCKED(name.lock), \
61 .task_list = { &(name).task_list, &(name).task_list } }
62
63#define DECLARE_WAIT_QUEUE_HEAD(name) \
64 wait_queue_head_t name = __WAIT_QUEUE_HEAD_INITIALIZER(name)
65
66#define __WAIT_BIT_KEY_INITIALIZER(word, bit) \
67 { .flags = word, .bit_nr = bit, }
68
69#define __WAIT_ATOMIC_T_KEY_INITIALIZER(p) \
70 { .flags = p, .bit_nr = WAIT_ATOMIC_T_BIT_NR, }
71
72extern void __init_waitqueue_head(wait_queue_head_t *q, const char *name, struct lock_class_key *);
73
74#define init_waitqueue_head(q) \
75 do { \
76 static struct lock_class_key __key; \
77 \
78 __init_waitqueue_head((q), #q, &__key); \
79 } while (0)
80
81#ifdef CONFIG_LOCKDEP
82# define __WAIT_QUEUE_HEAD_INIT_ONSTACK(name) \
83 ({ init_waitqueue_head(&name); name; })
84# define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) \
85 wait_queue_head_t name = __WAIT_QUEUE_HEAD_INIT_ONSTACK(name)
86#else
87# define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) DECLARE_WAIT_QUEUE_HEAD(name)
88#endif
89
90static inline void init_waitqueue_entry(wait_queue_t *q, struct task_struct *p)
91{
92 q->flags = 0;
93 q->private = p;
94 q->func = default_wake_function;
95}
96
97static inline void
98init_waitqueue_func_entry(wait_queue_t *q, wait_queue_func_t func)
99{
100 q->flags = 0;
101 q->private = NULL;
102 q->func = func;
103}
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135static inline int waitqueue_active(wait_queue_head_t *q)
136{
137 return !list_empty(&q->task_list);
138}
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148static inline bool wq_has_sleeper(wait_queue_head_t *wq)
149{
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157 smp_mb();
158 return waitqueue_active(wq);
159}
160
161extern void add_wait_queue(wait_queue_head_t *q, wait_queue_t *wait);
162extern void add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t *wait);
163extern void remove_wait_queue(wait_queue_head_t *q, wait_queue_t *wait);
164
165static inline void __add_wait_queue(wait_queue_head_t *head, wait_queue_t *new)
166{
167 list_add(&new->task_list, &head->task_list);
168}
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172
173static inline void
174__add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t *wait)
175{
176 wait->flags |= WQ_FLAG_EXCLUSIVE;
177 __add_wait_queue(q, wait);
178}
179
180static inline void __add_wait_queue_tail(wait_queue_head_t *head,
181 wait_queue_t *new)
182{
183 list_add_tail(&new->task_list, &head->task_list);
184}
185
186static inline void
187__add_wait_queue_tail_exclusive(wait_queue_head_t *q, wait_queue_t *wait)
188{
189 wait->flags |= WQ_FLAG_EXCLUSIVE;
190 __add_wait_queue_tail(q, wait);
191}
192
193static inline void
194__remove_wait_queue(wait_queue_head_t *head, wait_queue_t *old)
195{
196 list_del(&old->task_list);
197}
198
199typedef int wait_bit_action_f(struct wait_bit_key *, int mode);
200void __wake_up(wait_queue_head_t *q, unsigned int mode, int nr, void *key);
201void __wake_up_locked_key(wait_queue_head_t *q, unsigned int mode, void *key);
202void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode, int nr, void *key);
203void __wake_up_locked(wait_queue_head_t *q, unsigned int mode, int nr);
204void __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr);
205void __wake_up_bit(wait_queue_head_t *, void *, int);
206int __wait_on_bit(wait_queue_head_t *, struct wait_bit_queue *, wait_bit_action_f *, unsigned);
207int __wait_on_bit_lock(wait_queue_head_t *, struct wait_bit_queue *, wait_bit_action_f *, unsigned);
208void wake_up_bit(void *, int);
209void wake_up_atomic_t(atomic_t *);
210int out_of_line_wait_on_bit(void *, int, wait_bit_action_f *, unsigned);
211int out_of_line_wait_on_bit_timeout(void *, int, wait_bit_action_f *, unsigned, unsigned long);
212int out_of_line_wait_on_bit_lock(void *, int, wait_bit_action_f *, unsigned);
213int out_of_line_wait_on_atomic_t(atomic_t *, int (*)(atomic_t *), unsigned);
214wait_queue_head_t *bit_waitqueue(void *, int);
215
216#define wake_up(x) __wake_up(x, TASK_NORMAL, 1, NULL)
217#define wake_up_nr(x, nr) __wake_up(x, TASK_NORMAL, nr, NULL)
218#define wake_up_all(x) __wake_up(x, TASK_NORMAL, 0, NULL)
219#define wake_up_locked(x) __wake_up_locked((x), TASK_NORMAL, 1)
220#define wake_up_all_locked(x) __wake_up_locked((x), TASK_NORMAL, 0)
221
222#define wake_up_interruptible(x) __wake_up(x, TASK_INTERRUPTIBLE, 1, NULL)
223#define wake_up_interruptible_nr(x, nr) __wake_up(x, TASK_INTERRUPTIBLE, nr, NULL)
224#define wake_up_interruptible_all(x) __wake_up(x, TASK_INTERRUPTIBLE, 0, NULL)
225#define wake_up_interruptible_sync(x) __wake_up_sync((x), TASK_INTERRUPTIBLE, 1)
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230#define wake_up_poll(x, m) \
231 __wake_up(x, TASK_NORMAL, 1, (void *) (m))
232#define wake_up_locked_poll(x, m) \
233 __wake_up_locked_key((x), TASK_NORMAL, (void *) (m))
234#define wake_up_interruptible_poll(x, m) \
235 __wake_up(x, TASK_INTERRUPTIBLE, 1, (void *) (m))
236#define wake_up_interruptible_sync_poll(x, m) \
237 __wake_up_sync_key((x), TASK_INTERRUPTIBLE, 1, (void *) (m))
238
239#define ___wait_cond_timeout(condition) \
240({ \
241 bool __cond = (condition); \
242 if (__cond && !__ret) \
243 __ret = 1; \
244 __cond || !__ret; \
245})
246
247#define ___wait_is_interruptible(state) \
248 (!__builtin_constant_p(state) || \
249 state == TASK_INTERRUPTIBLE || state == TASK_KILLABLE) \
250
251extern void init_wait_entry(wait_queue_t *__wait, int flags);
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265#define ___wait_event(wq, condition, state, exclusive, ret, cmd) \
266({ \
267 __label__ __out; \
268 wait_queue_t __wait; \
269 long __ret = ret; \
270 \
271 init_wait_entry(&__wait, exclusive ? WQ_FLAG_EXCLUSIVE : 0); \
272 for (;;) { \
273 long __int = prepare_to_wait_event(&wq, &__wait, state);\
274 \
275 if (condition) \
276 break; \
277 \
278 if (___wait_is_interruptible(state) && __int) { \
279 __ret = __int; \
280 goto __out; \
281 } \
282 \
283 cmd; \
284 } \
285 finish_wait(&wq, &__wait); \
286__out: __ret; \
287})
288
289#define __wait_event(wq, condition) \
290 (void)___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, 0, \
291 schedule())
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305#define wait_event(wq, condition) \
306do { \
307 might_sleep(); \
308 if (condition) \
309 break; \
310 __wait_event(wq, condition); \
311} while (0)
312
313#define __io_wait_event(wq, condition) \
314 (void)___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, 0, \
315 io_schedule())
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320#define io_wait_event(wq, condition) \
321do { \
322 might_sleep(); \
323 if (condition) \
324 break; \
325 __io_wait_event(wq, condition); \
326} while (0)
327
328#define __wait_event_freezable(wq, condition) \
329 ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \
330 schedule(); try_to_freeze())
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344#define wait_event_freezable(wq, condition) \
345({ \
346 int __ret = 0; \
347 might_sleep(); \
348 if (!(condition)) \
349 __ret = __wait_event_freezable(wq, condition); \
350 __ret; \
351})
352
353#define __wait_event_timeout(wq, condition, timeout) \
354 ___wait_event(wq, ___wait_cond_timeout(condition), \
355 TASK_UNINTERRUPTIBLE, 0, timeout, \
356 __ret = schedule_timeout(__ret))
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377#define wait_event_timeout(wq, condition, timeout) \
378({ \
379 long __ret = timeout; \
380 might_sleep(); \
381 if (!___wait_cond_timeout(condition)) \
382 __ret = __wait_event_timeout(wq, condition, timeout); \
383 __ret; \
384})
385
386#define __wait_event_freezable_timeout(wq, condition, timeout) \
387 ___wait_event(wq, ___wait_cond_timeout(condition), \
388 TASK_INTERRUPTIBLE, 0, timeout, \
389 __ret = schedule_timeout(__ret); try_to_freeze())
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395#define wait_event_freezable_timeout(wq, condition, timeout) \
396({ \
397 long __ret = timeout; \
398 might_sleep(); \
399 if (!___wait_cond_timeout(condition)) \
400 __ret = __wait_event_freezable_timeout(wq, condition, timeout); \
401 __ret; \
402})
403
404#define __wait_event_exclusive_cmd(wq, condition, cmd1, cmd2) \
405 (void)___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 1, 0, \
406 cmd1; schedule(); cmd2)
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410#define wait_event_exclusive_cmd(wq, condition, cmd1, cmd2) \
411do { \
412 if (condition) \
413 break; \
414 __wait_event_exclusive_cmd(wq, condition, cmd1, cmd2); \
415} while (0)
416
417#define __wait_event_cmd(wq, condition, cmd1, cmd2) \
418 (void)___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, 0, \
419 cmd1; schedule(); cmd2)
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435#define wait_event_cmd(wq, condition, cmd1, cmd2) \
436do { \
437 if (condition) \
438 break; \
439 __wait_event_cmd(wq, condition, cmd1, cmd2); \
440} while (0)
441
442#define __wait_event_interruptible(wq, condition) \
443 ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \
444 schedule())
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461#define wait_event_interruptible(wq, condition) \
462({ \
463 int __ret = 0; \
464 might_sleep(); \
465 if (!(condition)) \
466 __ret = __wait_event_interruptible(wq, condition); \
467 __ret; \
468})
469
470#define __wait_event_interruptible_timeout(wq, condition, timeout) \
471 ___wait_event(wq, ___wait_cond_timeout(condition), \
472 TASK_INTERRUPTIBLE, 0, timeout, \
473 __ret = schedule_timeout(__ret))
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495#define wait_event_interruptible_timeout(wq, condition, timeout) \
496({ \
497 long __ret = timeout; \
498 might_sleep(); \
499 if (!___wait_cond_timeout(condition)) \
500 __ret = __wait_event_interruptible_timeout(wq, \
501 condition, timeout); \
502 __ret; \
503})
504
505#define __wait_event_hrtimeout(wq, condition, timeout, state) \
506({ \
507 int __ret = 0; \
508 struct hrtimer_sleeper __t; \
509 \
510 hrtimer_init_on_stack(&__t.timer, CLOCK_MONOTONIC, \
511 HRTIMER_MODE_REL); \
512 hrtimer_init_sleeper(&__t, current); \
513 if ((timeout).tv64 != KTIME_MAX) \
514 hrtimer_start_range_ns(&__t.timer, timeout, \
515 current->timer_slack_ns, \
516 HRTIMER_MODE_REL); \
517 \
518 __ret = ___wait_event(wq, condition, state, 0, 0, \
519 if (!__t.task) { \
520 __ret = -ETIME; \
521 break; \
522 } \
523 schedule()); \
524 \
525 hrtimer_cancel(&__t.timer); \
526 destroy_hrtimer_on_stack(&__t.timer); \
527 __ret; \
528})
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546#define wait_event_hrtimeout(wq, condition, timeout) \
547({ \
548 int __ret = 0; \
549 might_sleep(); \
550 if (!(condition)) \
551 __ret = __wait_event_hrtimeout(wq, condition, timeout, \
552 TASK_UNINTERRUPTIBLE); \
553 __ret; \
554})
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572#define wait_event_interruptible_hrtimeout(wq, condition, timeout) \
573({ \
574 long __ret = 0; \
575 might_sleep(); \
576 if (!(condition)) \
577 __ret = __wait_event_hrtimeout(wq, condition, timeout, \
578 TASK_INTERRUPTIBLE); \
579 __ret; \
580})
581
582#define __wait_event_interruptible_exclusive(wq, condition) \
583 ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 1, 0, \
584 schedule())
585
586#define wait_event_interruptible_exclusive(wq, condition) \
587({ \
588 int __ret = 0; \
589 might_sleep(); \
590 if (!(condition)) \
591 __ret = __wait_event_interruptible_exclusive(wq, condition);\
592 __ret; \
593})
594
595#define __wait_event_killable_exclusive(wq, condition) \
596 ___wait_event(wq, condition, TASK_KILLABLE, 1, 0, \
597 schedule())
598
599#define wait_event_killable_exclusive(wq, condition) \
600({ \
601 int __ret = 0; \
602 might_sleep(); \
603 if (!(condition)) \
604 __ret = __wait_event_killable_exclusive(wq, condition); \
605 __ret; \
606})
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609#define __wait_event_freezable_exclusive(wq, condition) \
610 ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 1, 0, \
611 schedule(); try_to_freeze())
612
613#define wait_event_freezable_exclusive(wq, condition) \
614({ \
615 int __ret = 0; \
616 might_sleep(); \
617 if (!(condition)) \
618 __ret = __wait_event_freezable_exclusive(wq, condition);\
619 __ret; \
620})
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622
623#define __wait_event_interruptible_locked(wq, condition, exclusive, irq) \
624({ \
625 int __ret = 0; \
626 DEFINE_WAIT(__wait); \
627 if (exclusive) \
628 __wait.flags |= WQ_FLAG_EXCLUSIVE; \
629 do { \
630 if (likely(list_empty(&__wait.task_list))) \
631 __add_wait_queue_tail(&(wq), &__wait); \
632 set_current_state(TASK_INTERRUPTIBLE); \
633 if (signal_pending(current)) { \
634 __ret = -ERESTARTSYS; \
635 break; \
636 } \
637 if (irq) \
638 spin_unlock_irq(&(wq).lock); \
639 else \
640 spin_unlock(&(wq).lock); \
641 schedule(); \
642 if (irq) \
643 spin_lock_irq(&(wq).lock); \
644 else \
645 spin_lock(&(wq).lock); \
646 } while (!(condition)); \
647 __remove_wait_queue(&(wq), &__wait); \
648 __set_current_state(TASK_RUNNING); \
649 __ret; \
650})
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676#define wait_event_interruptible_locked(wq, condition) \
677 ((condition) \
678 ? 0 : __wait_event_interruptible_locked(wq, condition, 0, 0))
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703#define wait_event_interruptible_locked_irq(wq, condition) \
704 ((condition) \
705 ? 0 : __wait_event_interruptible_locked(wq, condition, 0, 1))
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734#define wait_event_interruptible_exclusive_locked(wq, condition) \
735 ((condition) \
736 ? 0 : __wait_event_interruptible_locked(wq, condition, 1, 0))
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765#define wait_event_interruptible_exclusive_locked_irq(wq, condition) \
766 ((condition) \
767 ? 0 : __wait_event_interruptible_locked(wq, condition, 1, 1))
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770#define __wait_event_killable(wq, condition) \
771 ___wait_event(wq, condition, TASK_KILLABLE, 0, 0, schedule())
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788#define wait_event_killable(wq, condition) \
789({ \
790 int __ret = 0; \
791 might_sleep(); \
792 if (!(condition)) \
793 __ret = __wait_event_killable(wq, condition); \
794 __ret; \
795})
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797
798#define __wait_event_lock_irq(wq, condition, lock, cmd) \
799 (void)___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, 0, \
800 spin_unlock_irq(&lock); \
801 cmd; \
802 schedule(); \
803 spin_lock_irq(&lock))
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828#define wait_event_lock_irq_cmd(wq, condition, lock, cmd) \
829do { \
830 if (condition) \
831 break; \
832 __wait_event_lock_irq(wq, condition, lock, cmd); \
833} while (0)
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855#define wait_event_lock_irq(wq, condition, lock) \
856do { \
857 if (condition) \
858 break; \
859 __wait_event_lock_irq(wq, condition, lock, ); \
860} while (0)
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863#define __wait_event_interruptible_lock_irq(wq, condition, lock, cmd) \
864 ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \
865 spin_unlock_irq(&lock); \
866 cmd; \
867 schedule(); \
868 spin_lock_irq(&lock))
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895#define wait_event_interruptible_lock_irq_cmd(wq, condition, lock, cmd) \
896({ \
897 int __ret = 0; \
898 if (!(condition)) \
899 __ret = __wait_event_interruptible_lock_irq(wq, \
900 condition, lock, cmd); \
901 __ret; \
902})
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926#define wait_event_interruptible_lock_irq(wq, condition, lock) \
927({ \
928 int __ret = 0; \
929 if (!(condition)) \
930 __ret = __wait_event_interruptible_lock_irq(wq, \
931 condition, lock,); \
932 __ret; \
933})
934
935#define __wait_event_interruptible_lock_irq_timeout(wq, condition, \
936 lock, timeout) \
937 ___wait_event(wq, ___wait_cond_timeout(condition), \
938 TASK_INTERRUPTIBLE, 0, timeout, \
939 spin_unlock_irq(&lock); \
940 __ret = schedule_timeout(__ret); \
941 spin_lock_irq(&lock));
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967#define wait_event_interruptible_lock_irq_timeout(wq, condition, lock, \
968 timeout) \
969({ \
970 long __ret = timeout; \
971 if (!___wait_cond_timeout(condition)) \
972 __ret = __wait_event_interruptible_lock_irq_timeout( \
973 wq, condition, lock, timeout); \
974 __ret; \
975})
976
977
978
979
980void prepare_to_wait(wait_queue_head_t *q, wait_queue_t *wait, int state);
981void prepare_to_wait_exclusive(wait_queue_head_t *q, wait_queue_t *wait, int state);
982long prepare_to_wait_event(wait_queue_head_t *q, wait_queue_t *wait, int state);
983void finish_wait(wait_queue_head_t *q, wait_queue_t *wait);
984long wait_woken(wait_queue_t *wait, unsigned mode, long timeout);
985int woken_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
986int autoremove_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
987int wake_bit_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
988
989#define DEFINE_WAIT_FUNC(name, function) \
990 wait_queue_t name = { \
991 .private = current, \
992 .func = function, \
993 .task_list = LIST_HEAD_INIT((name).task_list), \
994 }
995
996#define DEFINE_WAIT(name) DEFINE_WAIT_FUNC(name, autoremove_wake_function)
997
998#define DEFINE_WAIT_BIT(name, word, bit) \
999 struct wait_bit_queue name = { \
1000 .key = __WAIT_BIT_KEY_INITIALIZER(word, bit), \
1001 .wait = { \
1002 .private = current, \
1003 .func = wake_bit_function, \
1004 .task_list = \
1005 LIST_HEAD_INIT((name).wait.task_list), \
1006 }, \
1007 }
1008
1009#define init_wait(wait) \
1010 do { \
1011 (wait)->private = current; \
1012 (wait)->func = autoremove_wake_function; \
1013 INIT_LIST_HEAD(&(wait)->task_list); \
1014 (wait)->flags = 0; \
1015 } while (0)
1016
1017
1018extern int bit_wait(struct wait_bit_key *, int);
1019extern int bit_wait_io(struct wait_bit_key *, int);
1020extern int bit_wait_timeout(struct wait_bit_key *, int);
1021extern int bit_wait_io_timeout(struct wait_bit_key *, int);
1022
1023
1024
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1038
1039static inline int
1040wait_on_bit(unsigned long *word, int bit, unsigned mode)
1041{
1042 might_sleep();
1043 if (!test_bit(bit, word))
1044 return 0;
1045 return out_of_line_wait_on_bit(word, bit,
1046 bit_wait,
1047 mode);
1048}
1049
1050
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1063
1064static inline int
1065wait_on_bit_io(unsigned long *word, int bit, unsigned mode)
1066{
1067 might_sleep();
1068 if (!test_bit(bit, word))
1069 return 0;
1070 return out_of_line_wait_on_bit(word, bit,
1071 bit_wait_io,
1072 mode);
1073}
1074
1075
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1080
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1089
1090static inline int
1091wait_on_bit_timeout(unsigned long *word, int bit, unsigned mode,
1092 unsigned long timeout)
1093{
1094 might_sleep();
1095 if (!test_bit(bit, word))
1096 return 0;
1097 return out_of_line_wait_on_bit_timeout(word, bit,
1098 bit_wait_timeout,
1099 mode, timeout);
1100}
1101
1102
1103
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1111
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1117
1118static inline int
1119wait_on_bit_action(unsigned long *word, int bit, wait_bit_action_f *action,
1120 unsigned mode)
1121{
1122 might_sleep();
1123 if (!test_bit(bit, word))
1124 return 0;
1125 return out_of_line_wait_on_bit(word, bit, action, mode);
1126}
1127
1128
1129
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1146
1147static inline int
1148wait_on_bit_lock(unsigned long *word, int bit, unsigned mode)
1149{
1150 might_sleep();
1151 if (!test_and_set_bit(bit, word))
1152 return 0;
1153 return out_of_line_wait_on_bit_lock(word, bit, bit_wait, mode);
1154}
1155
1156
1157
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1165
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1170
1171static inline int
1172wait_on_bit_lock_io(unsigned long *word, int bit, unsigned mode)
1173{
1174 might_sleep();
1175 if (!test_and_set_bit(bit, word))
1176 return 0;
1177 return out_of_line_wait_on_bit_lock(word, bit, bit_wait_io, mode);
1178}
1179
1180
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1183
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1196
1197static inline int
1198wait_on_bit_lock_action(unsigned long *word, int bit, wait_bit_action_f *action,
1199 unsigned mode)
1200{
1201 might_sleep();
1202 if (!test_and_set_bit(bit, word))
1203 return 0;
1204 return out_of_line_wait_on_bit_lock(word, bit, action, mode);
1205}
1206
1207
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1211
1212
1213
1214
1215
1216
1217static inline
1218int wait_on_atomic_t(atomic_t *val, int (*action)(atomic_t *), unsigned mode)
1219{
1220 might_sleep();
1221 if (atomic_read(val) == 0)
1222 return 0;
1223 return out_of_line_wait_on_atomic_t(val, action, mode);
1224}
1225
1226#endif
1227