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1da177e4 LT |
1 | #ifndef _LINUX_WAIT_H |
2 | #define _LINUX_WAIT_H | |
fb869b6e IM |
3 | /* |
4 | * Linux wait queue related types and methods | |
5 | */ | |
1da177e4 LT |
6 | #include <linux/list.h> |
7 | #include <linux/stddef.h> | |
8 | #include <linux/spinlock.h> | |
1da177e4 | 9 | #include <asm/current.h> |
607ca46e | 10 | #include <uapi/linux/wait.h> |
1da177e4 LT |
11 | |
12 | typedef struct __wait_queue wait_queue_t; | |
7d478721 PZ |
13 | typedef int (*wait_queue_func_t)(wait_queue_t *wait, unsigned mode, int flags, void *key); |
14 | int default_wake_function(wait_queue_t *wait, unsigned mode, int flags, void *key); | |
1da177e4 | 15 | |
61ada528 PZ |
16 | /* __wait_queue::flags */ |
17 | #define WQ_FLAG_EXCLUSIVE 0x01 | |
18 | #define WQ_FLAG_WOKEN 0x02 | |
19 | ||
1da177e4 | 20 | struct __wait_queue { |
fb869b6e | 21 | unsigned int flags; |
fb869b6e IM |
22 | void *private; |
23 | wait_queue_func_t func; | |
24 | struct list_head task_list; | |
1da177e4 LT |
25 | }; |
26 | ||
27 | struct wait_bit_key { | |
fb869b6e IM |
28 | void *flags; |
29 | int bit_nr; | |
30 | #define WAIT_ATOMIC_T_BIT_NR -1 | |
cbbce822 | 31 | unsigned long timeout; |
1da177e4 LT |
32 | }; |
33 | ||
34 | struct wait_bit_queue { | |
fb869b6e IM |
35 | struct wait_bit_key key; |
36 | wait_queue_t wait; | |
1da177e4 LT |
37 | }; |
38 | ||
39 | struct __wait_queue_head { | |
fb869b6e IM |
40 | spinlock_t lock; |
41 | struct list_head task_list; | |
1da177e4 LT |
42 | }; |
43 | typedef struct __wait_queue_head wait_queue_head_t; | |
44 | ||
8c65b4a6 | 45 | struct task_struct; |
1da177e4 LT |
46 | |
47 | /* | |
48 | * Macros for declaration and initialisaton of the datatypes | |
49 | */ | |
50 | ||
51 | #define __WAITQUEUE_INITIALIZER(name, tsk) { \ | |
c43dc2fd | 52 | .private = tsk, \ |
1da177e4 LT |
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) { \ | |
e4d91918 | 60 | .lock = __SPIN_LOCK_UNLOCKED(name.lock), \ |
1da177e4 LT |
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 | ||
cb65537e DH |
69 | #define __WAIT_ATOMIC_T_KEY_INITIALIZER(p) \ |
70 | { .flags = p, .bit_nr = WAIT_ATOMIC_T_BIT_NR, } | |
71 | ||
f07fdec5 | 72 | extern void __init_waitqueue_head(wait_queue_head_t *q, const char *name, struct lock_class_key *); |
2fc39111 PZ |
73 | |
74 | #define init_waitqueue_head(q) \ | |
75 | do { \ | |
76 | static struct lock_class_key __key; \ | |
77 | \ | |
f07fdec5 | 78 | __init_waitqueue_head((q), #q, &__key); \ |
2fc39111 | 79 | } while (0) |
1da177e4 | 80 | |
7259f0d0 PZ |
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 | ||
1da177e4 LT |
90 | static inline void init_waitqueue_entry(wait_queue_t *q, struct task_struct *p) |
91 | { | |
fb869b6e IM |
92 | q->flags = 0; |
93 | q->private = p; | |
94 | q->func = default_wake_function; | |
1da177e4 LT |
95 | } |
96 | ||
fb869b6e IM |
97 | static inline void |
98 | init_waitqueue_func_entry(wait_queue_t *q, wait_queue_func_t func) | |
1da177e4 | 99 | { |
fb869b6e IM |
100 | q->flags = 0; |
101 | q->private = NULL; | |
102 | q->func = func; | |
1da177e4 LT |
103 | } |
104 | ||
105 | static inline int waitqueue_active(wait_queue_head_t *q) | |
106 | { | |
107 | return !list_empty(&q->task_list); | |
108 | } | |
109 | ||
b3c97528 HH |
110 | extern void add_wait_queue(wait_queue_head_t *q, wait_queue_t *wait); |
111 | extern void add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t *wait); | |
112 | extern void remove_wait_queue(wait_queue_head_t *q, wait_queue_t *wait); | |
1da177e4 LT |
113 | |
114 | static inline void __add_wait_queue(wait_queue_head_t *head, wait_queue_t *new) | |
115 | { | |
116 | list_add(&new->task_list, &head->task_list); | |
117 | } | |
118 | ||
119 | /* | |
120 | * Used for wake-one threads: | |
121 | */ | |
fb869b6e IM |
122 | static inline void |
123 | __add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t *wait) | |
a93d2f17 CG |
124 | { |
125 | wait->flags |= WQ_FLAG_EXCLUSIVE; | |
126 | __add_wait_queue(q, wait); | |
127 | } | |
128 | ||
1da177e4 | 129 | static inline void __add_wait_queue_tail(wait_queue_head_t *head, |
a93d2f17 | 130 | wait_queue_t *new) |
1da177e4 LT |
131 | { |
132 | list_add_tail(&new->task_list, &head->task_list); | |
133 | } | |
134 | ||
fb869b6e IM |
135 | static inline void |
136 | __add_wait_queue_tail_exclusive(wait_queue_head_t *q, wait_queue_t *wait) | |
a93d2f17 CG |
137 | { |
138 | wait->flags |= WQ_FLAG_EXCLUSIVE; | |
139 | __add_wait_queue_tail(q, wait); | |
140 | } | |
141 | ||
fb869b6e IM |
142 | static inline void |
143 | __remove_wait_queue(wait_queue_head_t *head, wait_queue_t *old) | |
1da177e4 LT |
144 | { |
145 | list_del(&old->task_list); | |
146 | } | |
147 | ||
c1221321 | 148 | typedef int wait_bit_action_f(struct wait_bit_key *); |
b3c97528 | 149 | void __wake_up(wait_queue_head_t *q, unsigned int mode, int nr, void *key); |
4ede816a | 150 | void __wake_up_locked_key(wait_queue_head_t *q, unsigned int mode, void *key); |
fb869b6e | 151 | void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode, int nr, void *key); |
63b20011 | 152 | void __wake_up_locked(wait_queue_head_t *q, unsigned int mode, int nr); |
4ede816a | 153 | void __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr); |
b3c97528 | 154 | void __wake_up_bit(wait_queue_head_t *, void *, int); |
c1221321 N |
155 | int __wait_on_bit(wait_queue_head_t *, struct wait_bit_queue *, wait_bit_action_f *, unsigned); |
156 | int __wait_on_bit_lock(wait_queue_head_t *, struct wait_bit_queue *, wait_bit_action_f *, unsigned); | |
b3c97528 | 157 | void wake_up_bit(void *, int); |
cb65537e | 158 | void wake_up_atomic_t(atomic_t *); |
c1221321 | 159 | int out_of_line_wait_on_bit(void *, int, wait_bit_action_f *, unsigned); |
cbbce822 | 160 | int out_of_line_wait_on_bit_timeout(void *, int, wait_bit_action_f *, unsigned, unsigned long); |
c1221321 | 161 | int out_of_line_wait_on_bit_lock(void *, int, wait_bit_action_f *, unsigned); |
cb65537e | 162 | int out_of_line_wait_on_atomic_t(atomic_t *, int (*)(atomic_t *), unsigned); |
b3c97528 | 163 | wait_queue_head_t *bit_waitqueue(void *, int); |
1da177e4 | 164 | |
e64d66c8 MW |
165 | #define wake_up(x) __wake_up(x, TASK_NORMAL, 1, NULL) |
166 | #define wake_up_nr(x, nr) __wake_up(x, TASK_NORMAL, nr, NULL) | |
167 | #define wake_up_all(x) __wake_up(x, TASK_NORMAL, 0, NULL) | |
63b20011 TG |
168 | #define wake_up_locked(x) __wake_up_locked((x), TASK_NORMAL, 1) |
169 | #define wake_up_all_locked(x) __wake_up_locked((x), TASK_NORMAL, 0) | |
e64d66c8 | 170 | |
1da177e4 LT |
171 | #define wake_up_interruptible(x) __wake_up(x, TASK_INTERRUPTIBLE, 1, NULL) |
172 | #define wake_up_interruptible_nr(x, nr) __wake_up(x, TASK_INTERRUPTIBLE, nr, NULL) | |
173 | #define wake_up_interruptible_all(x) __wake_up(x, TASK_INTERRUPTIBLE, 0, NULL) | |
e64d66c8 | 174 | #define wake_up_interruptible_sync(x) __wake_up_sync((x), TASK_INTERRUPTIBLE, 1) |
1da177e4 | 175 | |
0ccf831c | 176 | /* |
c0da3775 | 177 | * Wakeup macros to be used to report events to the targets. |
0ccf831c | 178 | */ |
fb869b6e | 179 | #define wake_up_poll(x, m) \ |
c0da3775 | 180 | __wake_up(x, TASK_NORMAL, 1, (void *) (m)) |
fb869b6e | 181 | #define wake_up_locked_poll(x, m) \ |
c0da3775 | 182 | __wake_up_locked_key((x), TASK_NORMAL, (void *) (m)) |
fb869b6e | 183 | #define wake_up_interruptible_poll(x, m) \ |
c0da3775 DL |
184 | __wake_up(x, TASK_INTERRUPTIBLE, 1, (void *) (m)) |
185 | #define wake_up_interruptible_sync_poll(x, m) \ | |
186 | __wake_up_sync_key((x), TASK_INTERRUPTIBLE, 1, (void *) (m)) | |
0ccf831c | 187 | |
35a2af94 | 188 | #define ___wait_cond_timeout(condition) \ |
2953ef24 | 189 | ({ \ |
fb869b6e IM |
190 | bool __cond = (condition); \ |
191 | if (__cond && !__ret) \ | |
192 | __ret = 1; \ | |
193 | __cond || !__ret; \ | |
2953ef24 PZ |
194 | }) |
195 | ||
c2d81644 ON |
196 | #define ___wait_is_interruptible(state) \ |
197 | (!__builtin_constant_p(state) || \ | |
198 | state == TASK_INTERRUPTIBLE || state == TASK_KILLABLE) \ | |
41a1431b | 199 | |
8b32201d PZ |
200 | /* |
201 | * The below macro ___wait_event() has an explicit shadow of the __ret | |
202 | * variable when used from the wait_event_*() macros. | |
203 | * | |
204 | * This is so that both can use the ___wait_cond_timeout() construct | |
205 | * to wrap the condition. | |
206 | * | |
207 | * The type inconsistency of the wait_event_*() __ret variable is also | |
208 | * on purpose; we use long where we can return timeout values and int | |
209 | * otherwise. | |
210 | */ | |
211 | ||
41a1431b | 212 | #define ___wait_event(wq, condition, state, exclusive, ret, cmd) \ |
35a2af94 | 213 | ({ \ |
41a1431b | 214 | __label__ __out; \ |
c2d81644 | 215 | wait_queue_t __wait; \ |
8b32201d | 216 | long __ret = ret; /* explicit shadow */ \ |
41a1431b | 217 | \ |
c2d81644 ON |
218 | INIT_LIST_HEAD(&__wait.task_list); \ |
219 | if (exclusive) \ | |
220 | __wait.flags = WQ_FLAG_EXCLUSIVE; \ | |
221 | else \ | |
222 | __wait.flags = 0; \ | |
223 | \ | |
41a1431b | 224 | for (;;) { \ |
c2d81644 | 225 | long __int = prepare_to_wait_event(&wq, &__wait, state);\ |
41a1431b PZ |
226 | \ |
227 | if (condition) \ | |
228 | break; \ | |
229 | \ | |
c2d81644 ON |
230 | if (___wait_is_interruptible(state) && __int) { \ |
231 | __ret = __int; \ | |
41a1431b | 232 | if (exclusive) { \ |
fb869b6e IM |
233 | abort_exclusive_wait(&wq, &__wait, \ |
234 | state, NULL); \ | |
41a1431b PZ |
235 | goto __out; \ |
236 | } \ | |
237 | break; \ | |
238 | } \ | |
239 | \ | |
240 | cmd; \ | |
241 | } \ | |
242 | finish_wait(&wq, &__wait); \ | |
35a2af94 PZ |
243 | __out: __ret; \ |
244 | }) | |
41a1431b | 245 | |
fb869b6e | 246 | #define __wait_event(wq, condition) \ |
35a2af94 PZ |
247 | (void)___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, 0, \ |
248 | schedule()) | |
1da177e4 LT |
249 | |
250 | /** | |
251 | * wait_event - sleep until a condition gets true | |
252 | * @wq: the waitqueue to wait on | |
253 | * @condition: a C expression for the event to wait for | |
254 | * | |
255 | * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the | |
256 | * @condition evaluates to true. The @condition is checked each time | |
257 | * the waitqueue @wq is woken up. | |
258 | * | |
259 | * wake_up() has to be called after changing any variable that could | |
260 | * change the result of the wait condition. | |
261 | */ | |
fb869b6e | 262 | #define wait_event(wq, condition) \ |
1da177e4 | 263 | do { \ |
e22b886a | 264 | might_sleep(); \ |
fb869b6e | 265 | if (condition) \ |
1da177e4 LT |
266 | break; \ |
267 | __wait_event(wq, condition); \ | |
268 | } while (0) | |
269 | ||
36df04bc PZ |
270 | #define __wait_event_freezable(wq, condition) \ |
271 | ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \ | |
272 | schedule(); try_to_freeze()) | |
273 | ||
274 | /** | |
275 | * wait_event - sleep (or freeze) until a condition gets true | |
276 | * @wq: the waitqueue to wait on | |
277 | * @condition: a C expression for the event to wait for | |
278 | * | |
279 | * The process is put to sleep (TASK_INTERRUPTIBLE -- so as not to contribute | |
280 | * to system load) until the @condition evaluates to true. The | |
281 | * @condition is checked each time the waitqueue @wq is woken up. | |
282 | * | |
283 | * wake_up() has to be called after changing any variable that could | |
284 | * change the result of the wait condition. | |
285 | */ | |
286 | #define wait_event_freezable(wq, condition) \ | |
287 | ({ \ | |
288 | int __ret = 0; \ | |
289 | might_sleep(); \ | |
290 | if (!(condition)) \ | |
291 | __ret = __wait_event_freezable(wq, condition); \ | |
292 | __ret; \ | |
293 | }) | |
294 | ||
35a2af94 PZ |
295 | #define __wait_event_timeout(wq, condition, timeout) \ |
296 | ___wait_event(wq, ___wait_cond_timeout(condition), \ | |
297 | TASK_UNINTERRUPTIBLE, 0, timeout, \ | |
298 | __ret = schedule_timeout(__ret)) | |
1da177e4 LT |
299 | |
300 | /** | |
301 | * wait_event_timeout - sleep until a condition gets true or a timeout elapses | |
302 | * @wq: the waitqueue to wait on | |
303 | * @condition: a C expression for the event to wait for | |
304 | * @timeout: timeout, in jiffies | |
305 | * | |
306 | * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the | |
307 | * @condition evaluates to true. The @condition is checked each time | |
308 | * the waitqueue @wq is woken up. | |
309 | * | |
310 | * wake_up() has to be called after changing any variable that could | |
311 | * change the result of the wait condition. | |
312 | * | |
6b44f519 SD |
313 | * Returns: |
314 | * 0 if the @condition evaluated to %false after the @timeout elapsed, | |
315 | * 1 if the @condition evaluated to %true after the @timeout elapsed, | |
316 | * or the remaining jiffies (at least 1) if the @condition evaluated | |
317 | * to %true before the @timeout elapsed. | |
1da177e4 LT |
318 | */ |
319 | #define wait_event_timeout(wq, condition, timeout) \ | |
320 | ({ \ | |
321 | long __ret = timeout; \ | |
e22b886a | 322 | might_sleep(); \ |
8922915b | 323 | if (!___wait_cond_timeout(condition)) \ |
35a2af94 | 324 | __ret = __wait_event_timeout(wq, condition, timeout); \ |
1da177e4 LT |
325 | __ret; \ |
326 | }) | |
327 | ||
36df04bc PZ |
328 | #define __wait_event_freezable_timeout(wq, condition, timeout) \ |
329 | ___wait_event(wq, ___wait_cond_timeout(condition), \ | |
330 | TASK_INTERRUPTIBLE, 0, timeout, \ | |
331 | __ret = schedule_timeout(__ret); try_to_freeze()) | |
332 | ||
333 | /* | |
334 | * like wait_event_timeout() -- except it uses TASK_INTERRUPTIBLE to avoid | |
335 | * increasing load and is freezable. | |
336 | */ | |
337 | #define wait_event_freezable_timeout(wq, condition, timeout) \ | |
338 | ({ \ | |
339 | long __ret = timeout; \ | |
340 | might_sleep(); \ | |
341 | if (!___wait_cond_timeout(condition)) \ | |
342 | __ret = __wait_event_freezable_timeout(wq, condition, timeout); \ | |
343 | __ret; \ | |
344 | }) | |
345 | ||
82e06c81 SL |
346 | #define __wait_event_cmd(wq, condition, cmd1, cmd2) \ |
347 | (void)___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, 0, \ | |
348 | cmd1; schedule(); cmd2) | |
349 | ||
350 | /** | |
351 | * wait_event_cmd - sleep until a condition gets true | |
352 | * @wq: the waitqueue to wait on | |
353 | * @condition: a C expression for the event to wait for | |
f434f7af MI |
354 | * @cmd1: the command will be executed before sleep |
355 | * @cmd2: the command will be executed after sleep | |
82e06c81 SL |
356 | * |
357 | * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the | |
358 | * @condition evaluates to true. The @condition is checked each time | |
359 | * the waitqueue @wq is woken up. | |
360 | * | |
361 | * wake_up() has to be called after changing any variable that could | |
362 | * change the result of the wait condition. | |
363 | */ | |
364 | #define wait_event_cmd(wq, condition, cmd1, cmd2) \ | |
365 | do { \ | |
e22b886a | 366 | might_sleep(); \ |
82e06c81 SL |
367 | if (condition) \ |
368 | break; \ | |
369 | __wait_event_cmd(wq, condition, cmd1, cmd2); \ | |
370 | } while (0) | |
371 | ||
35a2af94 PZ |
372 | #define __wait_event_interruptible(wq, condition) \ |
373 | ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \ | |
f13f4c41 | 374 | schedule()) |
1da177e4 LT |
375 | |
376 | /** | |
377 | * wait_event_interruptible - sleep until a condition gets true | |
378 | * @wq: the waitqueue to wait on | |
379 | * @condition: a C expression for the event to wait for | |
380 | * | |
381 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the | |
382 | * @condition evaluates to true or a signal is received. | |
383 | * The @condition is checked each time the waitqueue @wq is woken up. | |
384 | * | |
385 | * wake_up() has to be called after changing any variable that could | |
386 | * change the result of the wait condition. | |
387 | * | |
388 | * The function will return -ERESTARTSYS if it was interrupted by a | |
389 | * signal and 0 if @condition evaluated to true. | |
390 | */ | |
391 | #define wait_event_interruptible(wq, condition) \ | |
392 | ({ \ | |
393 | int __ret = 0; \ | |
e22b886a | 394 | might_sleep(); \ |
1da177e4 | 395 | if (!(condition)) \ |
35a2af94 | 396 | __ret = __wait_event_interruptible(wq, condition); \ |
1da177e4 LT |
397 | __ret; \ |
398 | }) | |
399 | ||
35a2af94 PZ |
400 | #define __wait_event_interruptible_timeout(wq, condition, timeout) \ |
401 | ___wait_event(wq, ___wait_cond_timeout(condition), \ | |
402 | TASK_INTERRUPTIBLE, 0, timeout, \ | |
403 | __ret = schedule_timeout(__ret)) | |
1da177e4 LT |
404 | |
405 | /** | |
406 | * wait_event_interruptible_timeout - sleep until a condition gets true or a timeout elapses | |
407 | * @wq: the waitqueue to wait on | |
408 | * @condition: a C expression for the event to wait for | |
409 | * @timeout: timeout, in jiffies | |
410 | * | |
411 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the | |
412 | * @condition evaluates to true or a signal is received. | |
413 | * The @condition is checked each time the waitqueue @wq is woken up. | |
414 | * | |
415 | * wake_up() has to be called after changing any variable that could | |
416 | * change the result of the wait condition. | |
417 | * | |
4c663cfc | 418 | * Returns: |
6b44f519 SD |
419 | * 0 if the @condition evaluated to %false after the @timeout elapsed, |
420 | * 1 if the @condition evaluated to %true after the @timeout elapsed, | |
421 | * the remaining jiffies (at least 1) if the @condition evaluated | |
422 | * to %true before the @timeout elapsed, or -%ERESTARTSYS if it was | |
423 | * interrupted by a signal. | |
1da177e4 LT |
424 | */ |
425 | #define wait_event_interruptible_timeout(wq, condition, timeout) \ | |
426 | ({ \ | |
427 | long __ret = timeout; \ | |
e22b886a | 428 | might_sleep(); \ |
8922915b | 429 | if (!___wait_cond_timeout(condition)) \ |
fb869b6e | 430 | __ret = __wait_event_interruptible_timeout(wq, \ |
35a2af94 | 431 | condition, timeout); \ |
1da177e4 LT |
432 | __ret; \ |
433 | }) | |
434 | ||
774a08b3 KO |
435 | #define __wait_event_hrtimeout(wq, condition, timeout, state) \ |
436 | ({ \ | |
437 | int __ret = 0; \ | |
774a08b3 KO |
438 | struct hrtimer_sleeper __t; \ |
439 | \ | |
440 | hrtimer_init_on_stack(&__t.timer, CLOCK_MONOTONIC, \ | |
441 | HRTIMER_MODE_REL); \ | |
442 | hrtimer_init_sleeper(&__t, current); \ | |
443 | if ((timeout).tv64 != KTIME_MAX) \ | |
444 | hrtimer_start_range_ns(&__t.timer, timeout, \ | |
445 | current->timer_slack_ns, \ | |
446 | HRTIMER_MODE_REL); \ | |
447 | \ | |
35a2af94 | 448 | __ret = ___wait_event(wq, condition, state, 0, 0, \ |
774a08b3 KO |
449 | if (!__t.task) { \ |
450 | __ret = -ETIME; \ | |
451 | break; \ | |
452 | } \ | |
ebdc195f | 453 | schedule()); \ |
774a08b3 KO |
454 | \ |
455 | hrtimer_cancel(&__t.timer); \ | |
456 | destroy_hrtimer_on_stack(&__t.timer); \ | |
774a08b3 KO |
457 | __ret; \ |
458 | }) | |
459 | ||
460 | /** | |
461 | * wait_event_hrtimeout - sleep until a condition gets true or a timeout elapses | |
462 | * @wq: the waitqueue to wait on | |
463 | * @condition: a C expression for the event to wait for | |
464 | * @timeout: timeout, as a ktime_t | |
465 | * | |
466 | * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the | |
467 | * @condition evaluates to true or a signal is received. | |
468 | * The @condition is checked each time the waitqueue @wq is woken up. | |
469 | * | |
470 | * wake_up() has to be called after changing any variable that could | |
471 | * change the result of the wait condition. | |
472 | * | |
473 | * The function returns 0 if @condition became true, or -ETIME if the timeout | |
474 | * elapsed. | |
475 | */ | |
476 | #define wait_event_hrtimeout(wq, condition, timeout) \ | |
477 | ({ \ | |
478 | int __ret = 0; \ | |
e22b886a | 479 | might_sleep(); \ |
774a08b3 KO |
480 | if (!(condition)) \ |
481 | __ret = __wait_event_hrtimeout(wq, condition, timeout, \ | |
482 | TASK_UNINTERRUPTIBLE); \ | |
483 | __ret; \ | |
484 | }) | |
485 | ||
486 | /** | |
487 | * wait_event_interruptible_hrtimeout - sleep until a condition gets true or a timeout elapses | |
488 | * @wq: the waitqueue to wait on | |
489 | * @condition: a C expression for the event to wait for | |
490 | * @timeout: timeout, as a ktime_t | |
491 | * | |
492 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the | |
493 | * @condition evaluates to true or a signal is received. | |
494 | * The @condition is checked each time the waitqueue @wq is woken up. | |
495 | * | |
496 | * wake_up() has to be called after changing any variable that could | |
497 | * change the result of the wait condition. | |
498 | * | |
499 | * The function returns 0 if @condition became true, -ERESTARTSYS if it was | |
500 | * interrupted by a signal, or -ETIME if the timeout elapsed. | |
501 | */ | |
502 | #define wait_event_interruptible_hrtimeout(wq, condition, timeout) \ | |
503 | ({ \ | |
504 | long __ret = 0; \ | |
e22b886a | 505 | might_sleep(); \ |
774a08b3 KO |
506 | if (!(condition)) \ |
507 | __ret = __wait_event_hrtimeout(wq, condition, timeout, \ | |
508 | TASK_INTERRUPTIBLE); \ | |
509 | __ret; \ | |
510 | }) | |
511 | ||
35a2af94 PZ |
512 | #define __wait_event_interruptible_exclusive(wq, condition) \ |
513 | ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 1, 0, \ | |
48c25217 | 514 | schedule()) |
1da177e4 LT |
515 | |
516 | #define wait_event_interruptible_exclusive(wq, condition) \ | |
517 | ({ \ | |
518 | int __ret = 0; \ | |
e22b886a | 519 | might_sleep(); \ |
1da177e4 | 520 | if (!(condition)) \ |
35a2af94 | 521 | __ret = __wait_event_interruptible_exclusive(wq, condition);\ |
1da177e4 LT |
522 | __ret; \ |
523 | }) | |
524 | ||
22c43c81 | 525 | |
36df04bc PZ |
526 | #define __wait_event_freezable_exclusive(wq, condition) \ |
527 | ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 1, 0, \ | |
528 | schedule(); try_to_freeze()) | |
529 | ||
530 | #define wait_event_freezable_exclusive(wq, condition) \ | |
531 | ({ \ | |
532 | int __ret = 0; \ | |
533 | might_sleep(); \ | |
534 | if (!(condition)) \ | |
535 | __ret = __wait_event_freezable_exclusive(wq, condition);\ | |
536 | __ret; \ | |
537 | }) | |
538 | ||
539 | ||
22c43c81 MN |
540 | #define __wait_event_interruptible_locked(wq, condition, exclusive, irq) \ |
541 | ({ \ | |
542 | int __ret = 0; \ | |
543 | DEFINE_WAIT(__wait); \ | |
544 | if (exclusive) \ | |
545 | __wait.flags |= WQ_FLAG_EXCLUSIVE; \ | |
546 | do { \ | |
547 | if (likely(list_empty(&__wait.task_list))) \ | |
548 | __add_wait_queue_tail(&(wq), &__wait); \ | |
549 | set_current_state(TASK_INTERRUPTIBLE); \ | |
550 | if (signal_pending(current)) { \ | |
551 | __ret = -ERESTARTSYS; \ | |
552 | break; \ | |
553 | } \ | |
554 | if (irq) \ | |
555 | spin_unlock_irq(&(wq).lock); \ | |
556 | else \ | |
557 | spin_unlock(&(wq).lock); \ | |
558 | schedule(); \ | |
559 | if (irq) \ | |
560 | spin_lock_irq(&(wq).lock); \ | |
561 | else \ | |
562 | spin_lock(&(wq).lock); \ | |
563 | } while (!(condition)); \ | |
564 | __remove_wait_queue(&(wq), &__wait); \ | |
565 | __set_current_state(TASK_RUNNING); \ | |
566 | __ret; \ | |
567 | }) | |
568 | ||
569 | ||
570 | /** | |
571 | * wait_event_interruptible_locked - sleep until a condition gets true | |
572 | * @wq: the waitqueue to wait on | |
573 | * @condition: a C expression for the event to wait for | |
574 | * | |
575 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the | |
576 | * @condition evaluates to true or a signal is received. | |
577 | * The @condition is checked each time the waitqueue @wq is woken up. | |
578 | * | |
579 | * It must be called with wq.lock being held. This spinlock is | |
580 | * unlocked while sleeping but @condition testing is done while lock | |
581 | * is held and when this macro exits the lock is held. | |
582 | * | |
583 | * The lock is locked/unlocked using spin_lock()/spin_unlock() | |
584 | * functions which must match the way they are locked/unlocked outside | |
585 | * of this macro. | |
586 | * | |
587 | * wake_up_locked() has to be called after changing any variable that could | |
588 | * change the result of the wait condition. | |
589 | * | |
590 | * The function will return -ERESTARTSYS if it was interrupted by a | |
591 | * signal and 0 if @condition evaluated to true. | |
592 | */ | |
593 | #define wait_event_interruptible_locked(wq, condition) \ | |
594 | ((condition) \ | |
595 | ? 0 : __wait_event_interruptible_locked(wq, condition, 0, 0)) | |
596 | ||
597 | /** | |
598 | * wait_event_interruptible_locked_irq - sleep until a condition gets true | |
599 | * @wq: the waitqueue to wait on | |
600 | * @condition: a C expression for the event to wait for | |
601 | * | |
602 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the | |
603 | * @condition evaluates to true or a signal is received. | |
604 | * The @condition is checked each time the waitqueue @wq is woken up. | |
605 | * | |
606 | * It must be called with wq.lock being held. This spinlock is | |
607 | * unlocked while sleeping but @condition testing is done while lock | |
608 | * is held and when this macro exits the lock is held. | |
609 | * | |
610 | * The lock is locked/unlocked using spin_lock_irq()/spin_unlock_irq() | |
611 | * functions which must match the way they are locked/unlocked outside | |
612 | * of this macro. | |
613 | * | |
614 | * wake_up_locked() has to be called after changing any variable that could | |
615 | * change the result of the wait condition. | |
616 | * | |
617 | * The function will return -ERESTARTSYS if it was interrupted by a | |
618 | * signal and 0 if @condition evaluated to true. | |
619 | */ | |
620 | #define wait_event_interruptible_locked_irq(wq, condition) \ | |
621 | ((condition) \ | |
622 | ? 0 : __wait_event_interruptible_locked(wq, condition, 0, 1)) | |
623 | ||
624 | /** | |
625 | * wait_event_interruptible_exclusive_locked - sleep exclusively until a condition gets true | |
626 | * @wq: the waitqueue to wait on | |
627 | * @condition: a C expression for the event to wait for | |
628 | * | |
629 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the | |
630 | * @condition evaluates to true or a signal is received. | |
631 | * The @condition is checked each time the waitqueue @wq is woken up. | |
632 | * | |
633 | * It must be called with wq.lock being held. This spinlock is | |
634 | * unlocked while sleeping but @condition testing is done while lock | |
635 | * is held and when this macro exits the lock is held. | |
636 | * | |
637 | * The lock is locked/unlocked using spin_lock()/spin_unlock() | |
638 | * functions which must match the way they are locked/unlocked outside | |
639 | * of this macro. | |
640 | * | |
641 | * The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag | |
642 | * set thus when other process waits process on the list if this | |
643 | * process is awaken further processes are not considered. | |
644 | * | |
645 | * wake_up_locked() has to be called after changing any variable that could | |
646 | * change the result of the wait condition. | |
647 | * | |
648 | * The function will return -ERESTARTSYS if it was interrupted by a | |
649 | * signal and 0 if @condition evaluated to true. | |
650 | */ | |
651 | #define wait_event_interruptible_exclusive_locked(wq, condition) \ | |
652 | ((condition) \ | |
653 | ? 0 : __wait_event_interruptible_locked(wq, condition, 1, 0)) | |
654 | ||
655 | /** | |
656 | * wait_event_interruptible_exclusive_locked_irq - sleep until a condition gets true | |
657 | * @wq: the waitqueue to wait on | |
658 | * @condition: a C expression for the event to wait for | |
659 | * | |
660 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the | |
661 | * @condition evaluates to true or a signal is received. | |
662 | * The @condition is checked each time the waitqueue @wq is woken up. | |
663 | * | |
664 | * It must be called with wq.lock being held. This spinlock is | |
665 | * unlocked while sleeping but @condition testing is done while lock | |
666 | * is held and when this macro exits the lock is held. | |
667 | * | |
668 | * The lock is locked/unlocked using spin_lock_irq()/spin_unlock_irq() | |
669 | * functions which must match the way they are locked/unlocked outside | |
670 | * of this macro. | |
671 | * | |
672 | * The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag | |
673 | * set thus when other process waits process on the list if this | |
674 | * process is awaken further processes are not considered. | |
675 | * | |
676 | * wake_up_locked() has to be called after changing any variable that could | |
677 | * change the result of the wait condition. | |
678 | * | |
679 | * The function will return -ERESTARTSYS if it was interrupted by a | |
680 | * signal and 0 if @condition evaluated to true. | |
681 | */ | |
682 | #define wait_event_interruptible_exclusive_locked_irq(wq, condition) \ | |
683 | ((condition) \ | |
684 | ? 0 : __wait_event_interruptible_locked(wq, condition, 1, 1)) | |
685 | ||
686 | ||
35a2af94 PZ |
687 | #define __wait_event_killable(wq, condition) \ |
688 | ___wait_event(wq, condition, TASK_KILLABLE, 0, 0, schedule()) | |
1411d5a7 MW |
689 | |
690 | /** | |
691 | * wait_event_killable - sleep until a condition gets true | |
692 | * @wq: the waitqueue to wait on | |
693 | * @condition: a C expression for the event to wait for | |
694 | * | |
695 | * The process is put to sleep (TASK_KILLABLE) until the | |
696 | * @condition evaluates to true or a signal is received. | |
697 | * The @condition is checked each time the waitqueue @wq is woken up. | |
698 | * | |
699 | * wake_up() has to be called after changing any variable that could | |
700 | * change the result of the wait condition. | |
701 | * | |
702 | * The function will return -ERESTARTSYS if it was interrupted by a | |
703 | * signal and 0 if @condition evaluated to true. | |
704 | */ | |
705 | #define wait_event_killable(wq, condition) \ | |
706 | ({ \ | |
707 | int __ret = 0; \ | |
e22b886a | 708 | might_sleep(); \ |
1411d5a7 | 709 | if (!(condition)) \ |
35a2af94 | 710 | __ret = __wait_event_killable(wq, condition); \ |
1411d5a7 MW |
711 | __ret; \ |
712 | }) | |
713 | ||
eed8c02e LC |
714 | |
715 | #define __wait_event_lock_irq(wq, condition, lock, cmd) \ | |
35a2af94 PZ |
716 | (void)___wait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0, 0, \ |
717 | spin_unlock_irq(&lock); \ | |
718 | cmd; \ | |
719 | schedule(); \ | |
720 | spin_lock_irq(&lock)) | |
eed8c02e LC |
721 | |
722 | /** | |
723 | * wait_event_lock_irq_cmd - sleep until a condition gets true. The | |
724 | * condition is checked under the lock. This | |
725 | * is expected to be called with the lock | |
726 | * taken. | |
727 | * @wq: the waitqueue to wait on | |
728 | * @condition: a C expression for the event to wait for | |
729 | * @lock: a locked spinlock_t, which will be released before cmd | |
730 | * and schedule() and reacquired afterwards. | |
731 | * @cmd: a command which is invoked outside the critical section before | |
732 | * sleep | |
733 | * | |
734 | * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the | |
735 | * @condition evaluates to true. The @condition is checked each time | |
736 | * the waitqueue @wq is woken up. | |
737 | * | |
738 | * wake_up() has to be called after changing any variable that could | |
739 | * change the result of the wait condition. | |
740 | * | |
741 | * This is supposed to be called while holding the lock. The lock is | |
742 | * dropped before invoking the cmd and going to sleep and is reacquired | |
743 | * afterwards. | |
744 | */ | |
745 | #define wait_event_lock_irq_cmd(wq, condition, lock, cmd) \ | |
746 | do { \ | |
747 | if (condition) \ | |
748 | break; \ | |
749 | __wait_event_lock_irq(wq, condition, lock, cmd); \ | |
750 | } while (0) | |
751 | ||
752 | /** | |
753 | * wait_event_lock_irq - sleep until a condition gets true. The | |
754 | * condition is checked under the lock. This | |
755 | * is expected to be called with the lock | |
756 | * taken. | |
757 | * @wq: the waitqueue to wait on | |
758 | * @condition: a C expression for the event to wait for | |
759 | * @lock: a locked spinlock_t, which will be released before schedule() | |
760 | * and reacquired afterwards. | |
761 | * | |
762 | * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the | |
763 | * @condition evaluates to true. The @condition is checked each time | |
764 | * the waitqueue @wq is woken up. | |
765 | * | |
766 | * wake_up() has to be called after changing any variable that could | |
767 | * change the result of the wait condition. | |
768 | * | |
769 | * This is supposed to be called while holding the lock. The lock is | |
770 | * dropped before going to sleep and is reacquired afterwards. | |
771 | */ | |
772 | #define wait_event_lock_irq(wq, condition, lock) \ | |
773 | do { \ | |
774 | if (condition) \ | |
775 | break; \ | |
776 | __wait_event_lock_irq(wq, condition, lock, ); \ | |
777 | } while (0) | |
778 | ||
779 | ||
35a2af94 | 780 | #define __wait_event_interruptible_lock_irq(wq, condition, lock, cmd) \ |
fb869b6e | 781 | ___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0, \ |
35a2af94 PZ |
782 | spin_unlock_irq(&lock); \ |
783 | cmd; \ | |
784 | schedule(); \ | |
8fbd88fa | 785 | spin_lock_irq(&lock)) |
eed8c02e LC |
786 | |
787 | /** | |
788 | * wait_event_interruptible_lock_irq_cmd - sleep until a condition gets true. | |
789 | * The condition is checked under the lock. This is expected to | |
790 | * be called with the lock taken. | |
791 | * @wq: the waitqueue to wait on | |
792 | * @condition: a C expression for the event to wait for | |
793 | * @lock: a locked spinlock_t, which will be released before cmd and | |
794 | * schedule() and reacquired afterwards. | |
795 | * @cmd: a command which is invoked outside the critical section before | |
796 | * sleep | |
797 | * | |
798 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the | |
799 | * @condition evaluates to true or a signal is received. The @condition is | |
800 | * checked each time the waitqueue @wq is woken up. | |
801 | * | |
802 | * wake_up() has to be called after changing any variable that could | |
803 | * change the result of the wait condition. | |
804 | * | |
805 | * This is supposed to be called while holding the lock. The lock is | |
806 | * dropped before invoking the cmd and going to sleep and is reacquired | |
807 | * afterwards. | |
808 | * | |
809 | * The macro will return -ERESTARTSYS if it was interrupted by a signal | |
810 | * and 0 if @condition evaluated to true. | |
811 | */ | |
812 | #define wait_event_interruptible_lock_irq_cmd(wq, condition, lock, cmd) \ | |
813 | ({ \ | |
814 | int __ret = 0; \ | |
eed8c02e | 815 | if (!(condition)) \ |
fb869b6e | 816 | __ret = __wait_event_interruptible_lock_irq(wq, \ |
35a2af94 | 817 | condition, lock, cmd); \ |
eed8c02e LC |
818 | __ret; \ |
819 | }) | |
820 | ||
821 | /** | |
822 | * wait_event_interruptible_lock_irq - sleep until a condition gets true. | |
823 | * The condition is checked under the lock. This is expected | |
824 | * to be called with the lock taken. | |
825 | * @wq: the waitqueue to wait on | |
826 | * @condition: a C expression for the event to wait for | |
827 | * @lock: a locked spinlock_t, which will be released before schedule() | |
828 | * and reacquired afterwards. | |
829 | * | |
830 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the | |
831 | * @condition evaluates to true or signal is received. The @condition is | |
832 | * checked each time the waitqueue @wq is woken up. | |
833 | * | |
834 | * wake_up() has to be called after changing any variable that could | |
835 | * change the result of the wait condition. | |
836 | * | |
837 | * This is supposed to be called while holding the lock. The lock is | |
838 | * dropped before going to sleep and is reacquired afterwards. | |
839 | * | |
840 | * The macro will return -ERESTARTSYS if it was interrupted by a signal | |
841 | * and 0 if @condition evaluated to true. | |
842 | */ | |
843 | #define wait_event_interruptible_lock_irq(wq, condition, lock) \ | |
844 | ({ \ | |
845 | int __ret = 0; \ | |
eed8c02e | 846 | if (!(condition)) \ |
35a2af94 | 847 | __ret = __wait_event_interruptible_lock_irq(wq, \ |
92ec1180 | 848 | condition, lock,); \ |
eed8c02e LC |
849 | __ret; \ |
850 | }) | |
851 | ||
fb869b6e IM |
852 | #define __wait_event_interruptible_lock_irq_timeout(wq, condition, \ |
853 | lock, timeout) \ | |
35a2af94 | 854 | ___wait_event(wq, ___wait_cond_timeout(condition), \ |
7d716456 | 855 | TASK_INTERRUPTIBLE, 0, timeout, \ |
35a2af94 PZ |
856 | spin_unlock_irq(&lock); \ |
857 | __ret = schedule_timeout(__ret); \ | |
a1dc6852 | 858 | spin_lock_irq(&lock)); |
d79ff142 MP |
859 | |
860 | /** | |
fb869b6e IM |
861 | * wait_event_interruptible_lock_irq_timeout - sleep until a condition gets |
862 | * true or a timeout elapses. The condition is checked under | |
863 | * the lock. This is expected to be called with the lock taken. | |
d79ff142 MP |
864 | * @wq: the waitqueue to wait on |
865 | * @condition: a C expression for the event to wait for | |
866 | * @lock: a locked spinlock_t, which will be released before schedule() | |
867 | * and reacquired afterwards. | |
868 | * @timeout: timeout, in jiffies | |
869 | * | |
870 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the | |
871 | * @condition evaluates to true or signal is received. The @condition is | |
872 | * checked each time the waitqueue @wq is woken up. | |
873 | * | |
874 | * wake_up() has to be called after changing any variable that could | |
875 | * change the result of the wait condition. | |
876 | * | |
877 | * This is supposed to be called while holding the lock. The lock is | |
878 | * dropped before going to sleep and is reacquired afterwards. | |
879 | * | |
880 | * The function returns 0 if the @timeout elapsed, -ERESTARTSYS if it | |
881 | * was interrupted by a signal, and the remaining jiffies otherwise | |
882 | * if the condition evaluated to true before the timeout elapsed. | |
883 | */ | |
884 | #define wait_event_interruptible_lock_irq_timeout(wq, condition, lock, \ | |
885 | timeout) \ | |
886 | ({ \ | |
35a2af94 | 887 | long __ret = timeout; \ |
8922915b | 888 | if (!___wait_cond_timeout(condition)) \ |
35a2af94 PZ |
889 | __ret = __wait_event_interruptible_lock_irq_timeout( \ |
890 | wq, condition, lock, timeout); \ | |
d79ff142 MP |
891 | __ret; \ |
892 | }) | |
893 | ||
1da177e4 LT |
894 | /* |
895 | * Waitqueues which are removed from the waitqueue_head at wakeup time | |
896 | */ | |
b3c97528 HH |
897 | void prepare_to_wait(wait_queue_head_t *q, wait_queue_t *wait, int state); |
898 | void prepare_to_wait_exclusive(wait_queue_head_t *q, wait_queue_t *wait, int state); | |
c2d81644 | 899 | long prepare_to_wait_event(wait_queue_head_t *q, wait_queue_t *wait, int state); |
b3c97528 | 900 | void finish_wait(wait_queue_head_t *q, wait_queue_t *wait); |
fb869b6e | 901 | void abort_exclusive_wait(wait_queue_head_t *q, wait_queue_t *wait, unsigned int mode, void *key); |
61ada528 PZ |
902 | long wait_woken(wait_queue_t *wait, unsigned mode, long timeout); |
903 | int woken_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key); | |
1da177e4 LT |
904 | int autoremove_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key); |
905 | int wake_bit_function(wait_queue_t *wait, unsigned mode, int sync, void *key); | |
906 | ||
bf368e4e | 907 | #define DEFINE_WAIT_FUNC(name, function) \ |
1da177e4 | 908 | wait_queue_t name = { \ |
c43dc2fd | 909 | .private = current, \ |
bf368e4e | 910 | .func = function, \ |
7e43c84e | 911 | .task_list = LIST_HEAD_INIT((name).task_list), \ |
1da177e4 LT |
912 | } |
913 | ||
bf368e4e ED |
914 | #define DEFINE_WAIT(name) DEFINE_WAIT_FUNC(name, autoremove_wake_function) |
915 | ||
1da177e4 LT |
916 | #define DEFINE_WAIT_BIT(name, word, bit) \ |
917 | struct wait_bit_queue name = { \ | |
918 | .key = __WAIT_BIT_KEY_INITIALIZER(word, bit), \ | |
919 | .wait = { \ | |
c43dc2fd | 920 | .private = current, \ |
1da177e4 LT |
921 | .func = wake_bit_function, \ |
922 | .task_list = \ | |
923 | LIST_HEAD_INIT((name).wait.task_list), \ | |
924 | }, \ | |
925 | } | |
926 | ||
927 | #define init_wait(wait) \ | |
928 | do { \ | |
c43dc2fd | 929 | (wait)->private = current; \ |
1da177e4 LT |
930 | (wait)->func = autoremove_wake_function; \ |
931 | INIT_LIST_HEAD(&(wait)->task_list); \ | |
231d0aef | 932 | (wait)->flags = 0; \ |
1da177e4 LT |
933 | } while (0) |
934 | ||
74316201 | 935 | |
c1221321 N |
936 | extern int bit_wait(struct wait_bit_key *); |
937 | extern int bit_wait_io(struct wait_bit_key *); | |
cbbce822 N |
938 | extern int bit_wait_timeout(struct wait_bit_key *); |
939 | extern int bit_wait_io_timeout(struct wait_bit_key *); | |
74316201 | 940 | |
1da177e4 LT |
941 | /** |
942 | * wait_on_bit - wait for a bit to be cleared | |
943 | * @word: the word being waited on, a kernel virtual address | |
944 | * @bit: the bit of the word being waited on | |
1da177e4 LT |
945 | * @mode: the task state to sleep in |
946 | * | |
947 | * There is a standard hashed waitqueue table for generic use. This | |
948 | * is the part of the hashtable's accessor API that waits on a bit. | |
949 | * For instance, if one were to have waiters on a bitflag, one would | |
950 | * call wait_on_bit() in threads waiting for the bit to clear. | |
951 | * One uses wait_on_bit() where one is waiting for the bit to clear, | |
952 | * but has no intention of setting it. | |
74316201 N |
953 | * Returned value will be zero if the bit was cleared, or non-zero |
954 | * if the process received a signal and the mode permitted wakeup | |
955 | * on that signal. | |
956 | */ | |
957 | static inline int | |
958 | wait_on_bit(void *word, int bit, unsigned mode) | |
959 | { | |
e22b886a | 960 | might_sleep(); |
74316201 N |
961 | if (!test_bit(bit, word)) |
962 | return 0; | |
963 | return out_of_line_wait_on_bit(word, bit, | |
964 | bit_wait, | |
965 | mode); | |
966 | } | |
967 | ||
968 | /** | |
969 | * wait_on_bit_io - wait for a bit to be cleared | |
970 | * @word: the word being waited on, a kernel virtual address | |
971 | * @bit: the bit of the word being waited on | |
972 | * @mode: the task state to sleep in | |
973 | * | |
974 | * Use the standard hashed waitqueue table to wait for a bit | |
975 | * to be cleared. This is similar to wait_on_bit(), but calls | |
976 | * io_schedule() instead of schedule() for the actual waiting. | |
977 | * | |
978 | * Returned value will be zero if the bit was cleared, or non-zero | |
979 | * if the process received a signal and the mode permitted wakeup | |
980 | * on that signal. | |
981 | */ | |
982 | static inline int | |
983 | wait_on_bit_io(void *word, int bit, unsigned mode) | |
984 | { | |
e22b886a | 985 | might_sleep(); |
74316201 N |
986 | if (!test_bit(bit, word)) |
987 | return 0; | |
988 | return out_of_line_wait_on_bit(word, bit, | |
989 | bit_wait_io, | |
990 | mode); | |
991 | } | |
992 | ||
993 | /** | |
994 | * wait_on_bit_action - wait for a bit to be cleared | |
995 | * @word: the word being waited on, a kernel virtual address | |
996 | * @bit: the bit of the word being waited on | |
997 | * @action: the function used to sleep, which may take special actions | |
998 | * @mode: the task state to sleep in | |
999 | * | |
1000 | * Use the standard hashed waitqueue table to wait for a bit | |
1001 | * to be cleared, and allow the waiting action to be specified. | |
1002 | * This is like wait_on_bit() but allows fine control of how the waiting | |
1003 | * is done. | |
1004 | * | |
1005 | * Returned value will be zero if the bit was cleared, or non-zero | |
1006 | * if the process received a signal and the mode permitted wakeup | |
1007 | * on that signal. | |
1da177e4 | 1008 | */ |
fb869b6e | 1009 | static inline int |
c1221321 | 1010 | wait_on_bit_action(void *word, int bit, wait_bit_action_f *action, unsigned mode) |
1da177e4 | 1011 | { |
e22b886a | 1012 | might_sleep(); |
1da177e4 LT |
1013 | if (!test_bit(bit, word)) |
1014 | return 0; | |
1015 | return out_of_line_wait_on_bit(word, bit, action, mode); | |
1016 | } | |
1017 | ||
1018 | /** | |
1019 | * wait_on_bit_lock - wait for a bit to be cleared, when wanting to set it | |
1020 | * @word: the word being waited on, a kernel virtual address | |
1021 | * @bit: the bit of the word being waited on | |
1da177e4 LT |
1022 | * @mode: the task state to sleep in |
1023 | * | |
1024 | * There is a standard hashed waitqueue table for generic use. This | |
1025 | * is the part of the hashtable's accessor API that waits on a bit | |
1026 | * when one intends to set it, for instance, trying to lock bitflags. | |
1027 | * For instance, if one were to have waiters trying to set bitflag | |
1028 | * and waiting for it to clear before setting it, one would call | |
1029 | * wait_on_bit() in threads waiting to be able to set the bit. | |
1030 | * One uses wait_on_bit_lock() where one is waiting for the bit to | |
1031 | * clear with the intention of setting it, and when done, clearing it. | |
74316201 N |
1032 | * |
1033 | * Returns zero if the bit was (eventually) found to be clear and was | |
1034 | * set. Returns non-zero if a signal was delivered to the process and | |
1035 | * the @mode allows that signal to wake the process. | |
1036 | */ | |
1037 | static inline int | |
1038 | wait_on_bit_lock(void *word, int bit, unsigned mode) | |
1039 | { | |
e22b886a | 1040 | might_sleep(); |
74316201 N |
1041 | if (!test_and_set_bit(bit, word)) |
1042 | return 0; | |
1043 | return out_of_line_wait_on_bit_lock(word, bit, bit_wait, mode); | |
1044 | } | |
1045 | ||
1046 | /** | |
1047 | * wait_on_bit_lock_io - wait for a bit to be cleared, when wanting to set it | |
1048 | * @word: the word being waited on, a kernel virtual address | |
1049 | * @bit: the bit of the word being waited on | |
1050 | * @mode: the task state to sleep in | |
1051 | * | |
1052 | * Use the standard hashed waitqueue table to wait for a bit | |
1053 | * to be cleared and then to atomically set it. This is similar | |
1054 | * to wait_on_bit(), but calls io_schedule() instead of schedule() | |
1055 | * for the actual waiting. | |
1056 | * | |
1057 | * Returns zero if the bit was (eventually) found to be clear and was | |
1058 | * set. Returns non-zero if a signal was delivered to the process and | |
1059 | * the @mode allows that signal to wake the process. | |
1060 | */ | |
1061 | static inline int | |
1062 | wait_on_bit_lock_io(void *word, int bit, unsigned mode) | |
1063 | { | |
e22b886a | 1064 | might_sleep(); |
74316201 N |
1065 | if (!test_and_set_bit(bit, word)) |
1066 | return 0; | |
1067 | return out_of_line_wait_on_bit_lock(word, bit, bit_wait_io, mode); | |
1068 | } | |
1069 | ||
1070 | /** | |
1071 | * wait_on_bit_lock_action - wait for a bit to be cleared, when wanting to set it | |
1072 | * @word: the word being waited on, a kernel virtual address | |
1073 | * @bit: the bit of the word being waited on | |
1074 | * @action: the function used to sleep, which may take special actions | |
1075 | * @mode: the task state to sleep in | |
1076 | * | |
1077 | * Use the standard hashed waitqueue table to wait for a bit | |
1078 | * to be cleared and then to set it, and allow the waiting action | |
1079 | * to be specified. | |
1080 | * This is like wait_on_bit() but allows fine control of how the waiting | |
1081 | * is done. | |
1082 | * | |
1083 | * Returns zero if the bit was (eventually) found to be clear and was | |
1084 | * set. Returns non-zero if a signal was delivered to the process and | |
1085 | * the @mode allows that signal to wake the process. | |
1da177e4 | 1086 | */ |
fb869b6e | 1087 | static inline int |
c1221321 | 1088 | wait_on_bit_lock_action(void *word, int bit, wait_bit_action_f *action, unsigned mode) |
1da177e4 | 1089 | { |
e22b886a | 1090 | might_sleep(); |
1da177e4 LT |
1091 | if (!test_and_set_bit(bit, word)) |
1092 | return 0; | |
1093 | return out_of_line_wait_on_bit_lock(word, bit, action, mode); | |
1094 | } | |
cb65537e DH |
1095 | |
1096 | /** | |
1097 | * wait_on_atomic_t - Wait for an atomic_t to become 0 | |
1098 | * @val: The atomic value being waited on, a kernel virtual address | |
1099 | * @action: the function used to sleep, which may take special actions | |
1100 | * @mode: the task state to sleep in | |
1101 | * | |
1102 | * Wait for an atomic_t to become 0. We abuse the bit-wait waitqueue table for | |
1103 | * the purpose of getting a waitqueue, but we set the key to a bit number | |
1104 | * outside of the target 'word'. | |
1105 | */ | |
1106 | static inline | |
1107 | int wait_on_atomic_t(atomic_t *val, int (*action)(atomic_t *), unsigned mode) | |
1108 | { | |
e22b886a | 1109 | might_sleep(); |
cb65537e DH |
1110 | if (atomic_read(val) == 0) |
1111 | return 0; | |
1112 | return out_of_line_wait_on_atomic_t(val, action, mode); | |
1113 | } | |
fb869b6e IM |
1114 | |
1115 | #endif /* _LINUX_WAIT_H */ |