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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 | |
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 flags, void *key); |
30 | int default_wake_function(wait_queue_t *wait, unsigned mode, int flags, void *key); |
31 | |
32 | struct __wait_queue { |
33 | unsigned int flags; |
34 | #define WQ_FLAG_EXCLUSIVE 0x01 |
35 | void *private; |
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 | |
56 | struct task_struct; |
57 | |
58 | /* |
59 | * Macros for declaration and initialisaton of the datatypes |
60 | */ |
61 | |
62 | #define __WAITQUEUE_INITIALIZER(name, tsk) { \ |
63 | .private = tsk, \ |
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) { \ |
71 | .lock = __SPIN_LOCK_UNLOCKED(name.lock), \ |
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 | |
80 | extern void __init_waitqueue_head(wait_queue_head_t *q, struct lock_class_key *); |
81 | |
82 | #define init_waitqueue_head(q) \ |
83 | do { \ |
84 | static struct lock_class_key __key; \ |
85 | \ |
86 | __init_waitqueue_head((q), &__key); \ |
87 | } while (0) |
88 | |
89 | #ifdef CONFIG_LOCKDEP |
90 | # define __WAIT_QUEUE_HEAD_INIT_ONSTACK(name) \ |
91 | ({ init_waitqueue_head(&name); name; }) |
92 | # define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) \ |
93 | wait_queue_head_t name = __WAIT_QUEUE_HEAD_INIT_ONSTACK(name) |
94 | #else |
95 | # define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) DECLARE_WAIT_QUEUE_HEAD(name) |
96 | #endif |
97 | |
98 | static inline void init_waitqueue_entry(wait_queue_t *q, struct task_struct *p) |
99 | { |
100 | q->flags = 0; |
101 | q->private = p; |
102 | q->func = default_wake_function; |
103 | } |
104 | |
105 | static inline void init_waitqueue_func_entry(wait_queue_t *q, |
106 | wait_queue_func_t func) |
107 | { |
108 | q->flags = 0; |
109 | q->private = NULL; |
110 | q->func = func; |
111 | } |
112 | |
113 | static inline int waitqueue_active(wait_queue_head_t *q) |
114 | { |
115 | return !list_empty(&q->task_list); |
116 | } |
117 | |
118 | extern void add_wait_queue(wait_queue_head_t *q, wait_queue_t *wait); |
119 | extern void add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t *wait); |
120 | extern void remove_wait_queue(wait_queue_head_t *q, wait_queue_t *wait); |
121 | |
122 | static inline void __add_wait_queue(wait_queue_head_t *head, wait_queue_t *new) |
123 | { |
124 | list_add(&new->task_list, &head->task_list); |
125 | } |
126 | |
127 | /* |
128 | * Used for wake-one threads: |
129 | */ |
130 | static inline void __add_wait_queue_exclusive(wait_queue_head_t *q, |
131 | wait_queue_t *wait) |
132 | { |
133 | wait->flags |= WQ_FLAG_EXCLUSIVE; |
134 | __add_wait_queue(q, wait); |
135 | } |
136 | |
137 | static inline void __add_wait_queue_tail(wait_queue_head_t *head, |
138 | wait_queue_t *new) |
139 | { |
140 | list_add_tail(&new->task_list, &head->task_list); |
141 | } |
142 | |
143 | static inline void __add_wait_queue_tail_exclusive(wait_queue_head_t *q, |
144 | wait_queue_t *wait) |
145 | { |
146 | wait->flags |= WQ_FLAG_EXCLUSIVE; |
147 | __add_wait_queue_tail(q, wait); |
148 | } |
149 | |
150 | static inline void __remove_wait_queue(wait_queue_head_t *head, |
151 | wait_queue_t *old) |
152 | { |
153 | list_del(&old->task_list); |
154 | } |
155 | |
156 | void __wake_up(wait_queue_head_t *q, unsigned int mode, int nr, void *key); |
157 | void __wake_up_locked_key(wait_queue_head_t *q, unsigned int mode, void *key); |
158 | void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode, int nr, |
159 | void *key); |
160 | void __wake_up_locked(wait_queue_head_t *q, unsigned int mode); |
161 | void __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr); |
162 | void __wake_up_bit(wait_queue_head_t *, void *, int); |
163 | int __wait_on_bit(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned); |
164 | int __wait_on_bit_lock(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned); |
165 | void wake_up_bit(void *, int); |
166 | int out_of_line_wait_on_bit(void *, int, int (*)(void *), unsigned); |
167 | int out_of_line_wait_on_bit_lock(void *, int, int (*)(void *), unsigned); |
168 | wait_queue_head_t *bit_waitqueue(void *, int); |
169 | |
170 | #define wake_up(x) __wake_up(x, TASK_NORMAL, 1, NULL) |
171 | #define wake_up_nr(x, nr) __wake_up(x, TASK_NORMAL, nr, NULL) |
172 | #define wake_up_all(x) __wake_up(x, TASK_NORMAL, 0, NULL) |
173 | #define wake_up_locked(x) __wake_up_locked((x), TASK_NORMAL) |
174 | |
175 | #define wake_up_interruptible(x) __wake_up(x, TASK_INTERRUPTIBLE, 1, NULL) |
176 | #define wake_up_interruptible_nr(x, nr) __wake_up(x, TASK_INTERRUPTIBLE, nr, NULL) |
177 | #define wake_up_interruptible_all(x) __wake_up(x, TASK_INTERRUPTIBLE, 0, NULL) |
178 | #define wake_up_interruptible_sync(x) __wake_up_sync((x), TASK_INTERRUPTIBLE, 1) |
179 | |
180 | /* |
181 | * Wakeup macros to be used to report events to the targets. |
182 | */ |
183 | #define wake_up_poll(x, m) \ |
184 | __wake_up(x, TASK_NORMAL, 1, (void *) (m)) |
185 | #define wake_up_locked_poll(x, m) \ |
186 | __wake_up_locked_key((x), TASK_NORMAL, (void *) (m)) |
187 | #define wake_up_interruptible_poll(x, m) \ |
188 | __wake_up(x, TASK_INTERRUPTIBLE, 1, (void *) (m)) |
189 | #define wake_up_interruptible_sync_poll(x, m) \ |
190 | __wake_up_sync_key((x), TASK_INTERRUPTIBLE, 1, (void *) (m)) |
191 | |
192 | #define __wait_event(wq, condition) \ |
193 | do { \ |
194 | DEFINE_WAIT(__wait); \ |
195 | \ |
196 | for (;;) { \ |
197 | prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE); \ |
198 | if (condition) \ |
199 | break; \ |
200 | schedule(); \ |
201 | } \ |
202 | finish_wait(&wq, &__wait); \ |
203 | } while (0) |
204 | |
205 | /** |
206 | * wait_event - sleep until a condition gets true |
207 | * @wq: the waitqueue to wait on |
208 | * @condition: a C expression for the event to wait for |
209 | * |
210 | * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the |
211 | * @condition evaluates to true. The @condition is checked each time |
212 | * the waitqueue @wq is woken up. |
213 | * |
214 | * wake_up() has to be called after changing any variable that could |
215 | * change the result of the wait condition. |
216 | */ |
217 | #define wait_event(wq, condition) \ |
218 | do { \ |
219 | if (condition) \ |
220 | break; \ |
221 | __wait_event(wq, condition); \ |
222 | } while (0) |
223 | |
224 | #define __wait_event_timeout(wq, condition, ret) \ |
225 | do { \ |
226 | DEFINE_WAIT(__wait); \ |
227 | \ |
228 | for (;;) { \ |
229 | prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE); \ |
230 | if (condition) \ |
231 | break; \ |
232 | ret = schedule_timeout(ret); \ |
233 | if (!ret) \ |
234 | break; \ |
235 | } \ |
236 | finish_wait(&wq, &__wait); \ |
237 | } while (0) |
238 | |
239 | /** |
240 | * wait_event_timeout - sleep until a condition gets true or a timeout elapses |
241 | * @wq: the waitqueue to wait on |
242 | * @condition: a C expression for the event to wait for |
243 | * @timeout: timeout, in jiffies |
244 | * |
245 | * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the |
246 | * @condition evaluates to true. The @condition is checked each time |
247 | * the waitqueue @wq is woken up. |
248 | * |
249 | * wake_up() has to be called after changing any variable that could |
250 | * change the result of the wait condition. |
251 | * |
252 | * The function returns 0 if the @timeout elapsed, and the remaining |
253 | * jiffies if the condition evaluated to true before the timeout elapsed. |
254 | */ |
255 | #define wait_event_timeout(wq, condition, timeout) \ |
256 | ({ \ |
257 | long __ret = timeout; \ |
258 | if (!(condition)) \ |
259 | __wait_event_timeout(wq, condition, __ret); \ |
260 | __ret; \ |
261 | }) |
262 | |
263 | #define __wait_event_interruptible(wq, condition, ret) \ |
264 | do { \ |
265 | DEFINE_WAIT(__wait); \ |
266 | \ |
267 | for (;;) { \ |
268 | prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \ |
269 | if (condition) \ |
270 | break; \ |
271 | if (!signal_pending(current)) { \ |
272 | schedule(); \ |
273 | continue; \ |
274 | } \ |
275 | ret = -ERESTARTSYS; \ |
276 | break; \ |
277 | } \ |
278 | finish_wait(&wq, &__wait); \ |
279 | } while (0) |
280 | |
281 | /** |
282 | * wait_event_interruptible - sleep until a condition gets true |
283 | * @wq: the waitqueue to wait on |
284 | * @condition: a C expression for the event to wait for |
285 | * |
286 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the |
287 | * @condition evaluates to true or a signal is received. |
288 | * The @condition is checked each time the waitqueue @wq is woken up. |
289 | * |
290 | * wake_up() has to be called after changing any variable that could |
291 | * change the result of the wait condition. |
292 | * |
293 | * The function will return -ERESTARTSYS if it was interrupted by a |
294 | * signal and 0 if @condition evaluated to true. |
295 | */ |
296 | #define wait_event_interruptible(wq, condition) \ |
297 | ({ \ |
298 | int __ret = 0; \ |
299 | if (!(condition)) \ |
300 | __wait_event_interruptible(wq, condition, __ret); \ |
301 | __ret; \ |
302 | }) |
303 | |
304 | #define __wait_event_interruptible_timeout(wq, condition, ret) \ |
305 | do { \ |
306 | DEFINE_WAIT(__wait); \ |
307 | \ |
308 | for (;;) { \ |
309 | prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \ |
310 | if (condition) \ |
311 | break; \ |
312 | if (!signal_pending(current)) { \ |
313 | ret = schedule_timeout(ret); \ |
314 | if (!ret) \ |
315 | break; \ |
316 | continue; \ |
317 | } \ |
318 | ret = -ERESTARTSYS; \ |
319 | break; \ |
320 | } \ |
321 | finish_wait(&wq, &__wait); \ |
322 | } while (0) |
323 | |
324 | /** |
325 | * wait_event_interruptible_timeout - sleep until a condition gets true or a timeout elapses |
326 | * @wq: the waitqueue to wait on |
327 | * @condition: a C expression for the event to wait for |
328 | * @timeout: timeout, in jiffies |
329 | * |
330 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the |
331 | * @condition evaluates to true or a signal is received. |
332 | * The @condition is checked each time the waitqueue @wq is woken up. |
333 | * |
334 | * wake_up() has to be called after changing any variable that could |
335 | * change the result of the wait condition. |
336 | * |
337 | * The function returns 0 if the @timeout elapsed, -ERESTARTSYS if it |
338 | * was interrupted by a signal, and the remaining jiffies otherwise |
339 | * if the condition evaluated to true before the timeout elapsed. |
340 | */ |
341 | #define wait_event_interruptible_timeout(wq, condition, timeout) \ |
342 | ({ \ |
343 | long __ret = timeout; \ |
344 | if (!(condition)) \ |
345 | __wait_event_interruptible_timeout(wq, condition, __ret); \ |
346 | __ret; \ |
347 | }) |
348 | |
349 | #define __wait_event_interruptible_exclusive(wq, condition, ret) \ |
350 | do { \ |
351 | DEFINE_WAIT(__wait); \ |
352 | \ |
353 | for (;;) { \ |
354 | prepare_to_wait_exclusive(&wq, &__wait, \ |
355 | TASK_INTERRUPTIBLE); \ |
356 | if (condition) { \ |
357 | finish_wait(&wq, &__wait); \ |
358 | break; \ |
359 | } \ |
360 | if (!signal_pending(current)) { \ |
361 | schedule(); \ |
362 | continue; \ |
363 | } \ |
364 | ret = -ERESTARTSYS; \ |
365 | abort_exclusive_wait(&wq, &__wait, \ |
366 | TASK_INTERRUPTIBLE, NULL); \ |
367 | break; \ |
368 | } \ |
369 | } while (0) |
370 | |
371 | #define wait_event_interruptible_exclusive(wq, condition) \ |
372 | ({ \ |
373 | int __ret = 0; \ |
374 | if (!(condition)) \ |
375 | __wait_event_interruptible_exclusive(wq, condition, __ret);\ |
376 | __ret; \ |
377 | }) |
378 | |
379 | |
380 | #define __wait_event_interruptible_locked(wq, condition, exclusive, irq) \ |
381 | ({ \ |
382 | int __ret = 0; \ |
383 | DEFINE_WAIT(__wait); \ |
384 | if (exclusive) \ |
385 | __wait.flags |= WQ_FLAG_EXCLUSIVE; \ |
386 | do { \ |
387 | if (likely(list_empty(&__wait.task_list))) \ |
388 | __add_wait_queue_tail(&(wq), &__wait); \ |
389 | set_current_state(TASK_INTERRUPTIBLE); \ |
390 | if (signal_pending(current)) { \ |
391 | __ret = -ERESTARTSYS; \ |
392 | break; \ |
393 | } \ |
394 | if (irq) \ |
395 | spin_unlock_irq(&(wq).lock); \ |
396 | else \ |
397 | spin_unlock(&(wq).lock); \ |
398 | schedule(); \ |
399 | if (irq) \ |
400 | spin_lock_irq(&(wq).lock); \ |
401 | else \ |
402 | spin_lock(&(wq).lock); \ |
403 | } while (!(condition)); \ |
404 | __remove_wait_queue(&(wq), &__wait); \ |
405 | __set_current_state(TASK_RUNNING); \ |
406 | __ret; \ |
407 | }) |
408 | |
409 | |
410 | /** |
411 | * wait_event_interruptible_locked - sleep until a condition gets true |
412 | * @wq: the waitqueue to wait on |
413 | * @condition: a C expression for the event to wait for |
414 | * |
415 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the |
416 | * @condition evaluates to true or a signal is received. |
417 | * The @condition is checked each time the waitqueue @wq is woken up. |
418 | * |
419 | * It must be called with wq.lock being held. This spinlock is |
420 | * unlocked while sleeping but @condition testing is done while lock |
421 | * is held and when this macro exits the lock is held. |
422 | * |
423 | * The lock is locked/unlocked using spin_lock()/spin_unlock() |
424 | * functions which must match the way they are locked/unlocked outside |
425 | * of this macro. |
426 | * |
427 | * wake_up_locked() has to be called after changing any variable that could |
428 | * change the result of the wait condition. |
429 | * |
430 | * The function will return -ERESTARTSYS if it was interrupted by a |
431 | * signal and 0 if @condition evaluated to true. |
432 | */ |
433 | #define wait_event_interruptible_locked(wq, condition) \ |
434 | ((condition) \ |
435 | ? 0 : __wait_event_interruptible_locked(wq, condition, 0, 0)) |
436 | |
437 | /** |
438 | * wait_event_interruptible_locked_irq - sleep until a condition gets true |
439 | * @wq: the waitqueue to wait on |
440 | * @condition: a C expression for the event to wait for |
441 | * |
442 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the |
443 | * @condition evaluates to true or a signal is received. |
444 | * The @condition is checked each time the waitqueue @wq is woken up. |
445 | * |
446 | * It must be called with wq.lock being held. This spinlock is |
447 | * unlocked while sleeping but @condition testing is done while lock |
448 | * is held and when this macro exits the lock is held. |
449 | * |
450 | * The lock is locked/unlocked using spin_lock_irq()/spin_unlock_irq() |
451 | * functions which must match the way they are locked/unlocked outside |
452 | * of this macro. |
453 | * |
454 | * wake_up_locked() has to be called after changing any variable that could |
455 | * change the result of the wait condition. |
456 | * |
457 | * The function will return -ERESTARTSYS if it was interrupted by a |
458 | * signal and 0 if @condition evaluated to true. |
459 | */ |
460 | #define wait_event_interruptible_locked_irq(wq, condition) \ |
461 | ((condition) \ |
462 | ? 0 : __wait_event_interruptible_locked(wq, condition, 0, 1)) |
463 | |
464 | /** |
465 | * wait_event_interruptible_exclusive_locked - sleep exclusively until a condition gets true |
466 | * @wq: the waitqueue to wait on |
467 | * @condition: a C expression for the event to wait for |
468 | * |
469 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the |
470 | * @condition evaluates to true or a signal is received. |
471 | * The @condition is checked each time the waitqueue @wq is woken up. |
472 | * |
473 | * It must be called with wq.lock being held. This spinlock is |
474 | * unlocked while sleeping but @condition testing is done while lock |
475 | * is held and when this macro exits the lock is held. |
476 | * |
477 | * The lock is locked/unlocked using spin_lock()/spin_unlock() |
478 | * functions which must match the way they are locked/unlocked outside |
479 | * of this macro. |
480 | * |
481 | * The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag |
482 | * set thus when other process waits process on the list if this |
483 | * process is awaken further processes are not considered. |
484 | * |
485 | * wake_up_locked() has to be called after changing any variable that could |
486 | * change the result of the wait condition. |
487 | * |
488 | * The function will return -ERESTARTSYS if it was interrupted by a |
489 | * signal and 0 if @condition evaluated to true. |
490 | */ |
491 | #define wait_event_interruptible_exclusive_locked(wq, condition) \ |
492 | ((condition) \ |
493 | ? 0 : __wait_event_interruptible_locked(wq, condition, 1, 0)) |
494 | |
495 | /** |
496 | * wait_event_interruptible_exclusive_locked_irq - sleep until a condition gets true |
497 | * @wq: the waitqueue to wait on |
498 | * @condition: a C expression for the event to wait for |
499 | * |
500 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the |
501 | * @condition evaluates to true or a signal is received. |
502 | * The @condition is checked each time the waitqueue @wq is woken up. |
503 | * |
504 | * It must be called with wq.lock being held. This spinlock is |
505 | * unlocked while sleeping but @condition testing is done while lock |
506 | * is held and when this macro exits the lock is held. |
507 | * |
508 | * The lock is locked/unlocked using spin_lock_irq()/spin_unlock_irq() |
509 | * functions which must match the way they are locked/unlocked outside |
510 | * of this macro. |
511 | * |
512 | * The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag |
513 | * set thus when other process waits process on the list if this |
514 | * process is awaken further processes are not considered. |
515 | * |
516 | * wake_up_locked() has to be called after changing any variable that could |
517 | * change the result of the wait condition. |
518 | * |
519 | * The function will return -ERESTARTSYS if it was interrupted by a |
520 | * signal and 0 if @condition evaluated to true. |
521 | */ |
522 | #define wait_event_interruptible_exclusive_locked_irq(wq, condition) \ |
523 | ((condition) \ |
524 | ? 0 : __wait_event_interruptible_locked(wq, condition, 1, 1)) |
525 | |
526 | |
527 | |
528 | #define __wait_event_killable(wq, condition, ret) \ |
529 | do { \ |
530 | DEFINE_WAIT(__wait); \ |
531 | \ |
532 | for (;;) { \ |
533 | prepare_to_wait(&wq, &__wait, TASK_KILLABLE); \ |
534 | if (condition) \ |
535 | break; \ |
536 | if (!fatal_signal_pending(current)) { \ |
537 | schedule(); \ |
538 | continue; \ |
539 | } \ |
540 | ret = -ERESTARTSYS; \ |
541 | break; \ |
542 | } \ |
543 | finish_wait(&wq, &__wait); \ |
544 | } while (0) |
545 | |
546 | /** |
547 | * wait_event_killable - sleep until a condition gets true |
548 | * @wq: the waitqueue to wait on |
549 | * @condition: a C expression for the event to wait for |
550 | * |
551 | * The process is put to sleep (TASK_KILLABLE) until the |
552 | * @condition evaluates to true or a signal is received. |
553 | * The @condition is checked each time the waitqueue @wq is woken up. |
554 | * |
555 | * wake_up() has to be called after changing any variable that could |
556 | * change the result of the wait condition. |
557 | * |
558 | * The function will return -ERESTARTSYS if it was interrupted by a |
559 | * signal and 0 if @condition evaluated to true. |
560 | */ |
561 | #define wait_event_killable(wq, condition) \ |
562 | ({ \ |
563 | int __ret = 0; \ |
564 | if (!(condition)) \ |
565 | __wait_event_killable(wq, condition, __ret); \ |
566 | __ret; \ |
567 | }) |
568 | |
569 | /* |
570 | * These are the old interfaces to sleep waiting for an event. |
571 | * They are racy. DO NOT use them, use the wait_event* interfaces above. |
572 | * We plan to remove these interfaces. |
573 | */ |
574 | extern void sleep_on(wait_queue_head_t *q); |
575 | extern long sleep_on_timeout(wait_queue_head_t *q, |
576 | signed long timeout); |
577 | extern void interruptible_sleep_on(wait_queue_head_t *q); |
578 | extern long interruptible_sleep_on_timeout(wait_queue_head_t *q, |
579 | signed long timeout); |
580 | |
581 | /* |
582 | * Waitqueues which are removed from the waitqueue_head at wakeup time |
583 | */ |
584 | void prepare_to_wait(wait_queue_head_t *q, wait_queue_t *wait, int state); |
585 | void prepare_to_wait_exclusive(wait_queue_head_t *q, wait_queue_t *wait, int state); |
586 | void finish_wait(wait_queue_head_t *q, wait_queue_t *wait); |
587 | void abort_exclusive_wait(wait_queue_head_t *q, wait_queue_t *wait, |
588 | unsigned int mode, void *key); |
589 | int autoremove_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key); |
590 | int wake_bit_function(wait_queue_t *wait, unsigned mode, int sync, void *key); |
591 | |
592 | #define DEFINE_WAIT_FUNC(name, function) \ |
593 | wait_queue_t name = { \ |
594 | .private = current, \ |
595 | .func = function, \ |
596 | .task_list = LIST_HEAD_INIT((name).task_list), \ |
597 | } |
598 | |
599 | #define DEFINE_WAIT(name) DEFINE_WAIT_FUNC(name, autoremove_wake_function) |
600 | |
601 | #define DEFINE_WAIT_BIT(name, word, bit) \ |
602 | struct wait_bit_queue name = { \ |
603 | .key = __WAIT_BIT_KEY_INITIALIZER(word, bit), \ |
604 | .wait = { \ |
605 | .private = current, \ |
606 | .func = wake_bit_function, \ |
607 | .task_list = \ |
608 | LIST_HEAD_INIT((name).wait.task_list), \ |
609 | }, \ |
610 | } |
611 | |
612 | #define init_wait(wait) \ |
613 | do { \ |
614 | (wait)->private = current; \ |
615 | (wait)->func = autoremove_wake_function; \ |
616 | INIT_LIST_HEAD(&(wait)->task_list); \ |
617 | (wait)->flags = 0; \ |
618 | } while (0) |
619 | |
620 | /** |
621 | * wait_on_bit - wait for a bit to be cleared |
622 | * @word: the word being waited on, a kernel virtual address |
623 | * @bit: the bit of the word being waited on |
624 | * @action: the function used to sleep, which may take special actions |
625 | * @mode: the task state to sleep in |
626 | * |
627 | * There is a standard hashed waitqueue table for generic use. This |
628 | * is the part of the hashtable's accessor API that waits on a bit. |
629 | * For instance, if one were to have waiters on a bitflag, one would |
630 | * call wait_on_bit() in threads waiting for the bit to clear. |
631 | * One uses wait_on_bit() where one is waiting for the bit to clear, |
632 | * but has no intention of setting it. |
633 | */ |
634 | static inline int wait_on_bit(void *word, int bit, |
635 | int (*action)(void *), unsigned mode) |
636 | { |
637 | if (!test_bit(bit, word)) |
638 | return 0; |
639 | return out_of_line_wait_on_bit(word, bit, action, mode); |
640 | } |
641 | |
642 | /** |
643 | * wait_on_bit_lock - wait for a bit to be cleared, when wanting to set it |
644 | * @word: the word being waited on, a kernel virtual address |
645 | * @bit: the bit of the word being waited on |
646 | * @action: the function used to sleep, which may take special actions |
647 | * @mode: the task state to sleep in |
648 | * |
649 | * There is a standard hashed waitqueue table for generic use. This |
650 | * is the part of the hashtable's accessor API that waits on a bit |
651 | * when one intends to set it, for instance, trying to lock bitflags. |
652 | * For instance, if one were to have waiters trying to set bitflag |
653 | * and waiting for it to clear before setting it, one would call |
654 | * wait_on_bit() in threads waiting to be able to set the bit. |
655 | * One uses wait_on_bit_lock() where one is waiting for the bit to |
656 | * clear with the intention of setting it, and when done, clearing it. |
657 | */ |
658 | static inline int wait_on_bit_lock(void *word, int bit, |
659 | int (*action)(void *), unsigned mode) |
660 | { |
661 | if (!test_and_set_bit(bit, word)) |
662 | return 0; |
663 | return out_of_line_wait_on_bit_lock(word, bit, action, mode); |
664 | } |
665 | |
666 | #endif /* __KERNEL__ */ |
667 | |
668 | #endif |
669 |
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