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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_tail(wait_queue_head_t *head, |
131 | wait_queue_t *new) |
132 | { |
133 | list_add_tail(&new->task_list, &head->task_list); |
134 | } |
135 | |
136 | static inline void __remove_wait_queue(wait_queue_head_t *head, |
137 | wait_queue_t *old) |
138 | { |
139 | list_del(&old->task_list); |
140 | } |
141 | |
142 | void __wake_up(wait_queue_head_t *q, unsigned int mode, int nr, void *key); |
143 | void __wake_up_locked_key(wait_queue_head_t *q, unsigned int mode, void *key); |
144 | void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode, int nr, |
145 | void *key); |
146 | void __wake_up_locked(wait_queue_head_t *q, unsigned int mode); |
147 | void __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr); |
148 | void __wake_up_bit(wait_queue_head_t *, void *, int); |
149 | int __wait_on_bit(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned); |
150 | int __wait_on_bit_lock(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned); |
151 | void wake_up_bit(void *, int); |
152 | int out_of_line_wait_on_bit(void *, int, int (*)(void *), unsigned); |
153 | int out_of_line_wait_on_bit_lock(void *, int, int (*)(void *), unsigned); |
154 | wait_queue_head_t *bit_waitqueue(void *, int); |
155 | |
156 | #define wake_up(x) __wake_up(x, TASK_NORMAL, 1, NULL) |
157 | #define wake_up_nr(x, nr) __wake_up(x, TASK_NORMAL, nr, NULL) |
158 | #define wake_up_all(x) __wake_up(x, TASK_NORMAL, 0, NULL) |
159 | #define wake_up_locked(x) __wake_up_locked((x), TASK_NORMAL) |
160 | |
161 | #define wake_up_interruptible(x) __wake_up(x, TASK_INTERRUPTIBLE, 1, NULL) |
162 | #define wake_up_interruptible_nr(x, nr) __wake_up(x, TASK_INTERRUPTIBLE, nr, NULL) |
163 | #define wake_up_interruptible_all(x) __wake_up(x, TASK_INTERRUPTIBLE, 0, NULL) |
164 | #define wake_up_interruptible_sync(x) __wake_up_sync((x), TASK_INTERRUPTIBLE, 1) |
165 | |
166 | /* |
167 | * Wakeup macros to be used to report events to the targets. |
168 | */ |
169 | #define wake_up_poll(x, m) \ |
170 | __wake_up(x, TASK_NORMAL, 1, (void *) (m)) |
171 | #define wake_up_locked_poll(x, m) \ |
172 | __wake_up_locked_key((x), TASK_NORMAL, (void *) (m)) |
173 | #define wake_up_interruptible_poll(x, m) \ |
174 | __wake_up(x, TASK_INTERRUPTIBLE, 1, (void *) (m)) |
175 | #define wake_up_interruptible_sync_poll(x, m) \ |
176 | __wake_up_sync_key((x), TASK_INTERRUPTIBLE, 1, (void *) (m)) |
177 | |
178 | #define __wait_event(wq, condition) \ |
179 | do { \ |
180 | DEFINE_WAIT(__wait); \ |
181 | \ |
182 | for (;;) { \ |
183 | prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE); \ |
184 | if (condition) \ |
185 | break; \ |
186 | schedule(); \ |
187 | } \ |
188 | finish_wait(&wq, &__wait); \ |
189 | } while (0) |
190 | |
191 | /** |
192 | * wait_event - sleep until a condition gets true |
193 | * @wq: the waitqueue to wait on |
194 | * @condition: a C expression for the event to wait for |
195 | * |
196 | * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the |
197 | * @condition evaluates to true. The @condition is checked each time |
198 | * the waitqueue @wq is woken up. |
199 | * |
200 | * wake_up() has to be called after changing any variable that could |
201 | * change the result of the wait condition. |
202 | */ |
203 | #define wait_event(wq, condition) \ |
204 | do { \ |
205 | if (condition) \ |
206 | break; \ |
207 | __wait_event(wq, condition); \ |
208 | } while (0) |
209 | |
210 | #define __wait_event_timeout(wq, condition, ret) \ |
211 | do { \ |
212 | DEFINE_WAIT(__wait); \ |
213 | \ |
214 | for (;;) { \ |
215 | prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE); \ |
216 | if (condition) \ |
217 | break; \ |
218 | ret = schedule_timeout(ret); \ |
219 | if (!ret) \ |
220 | break; \ |
221 | } \ |
222 | finish_wait(&wq, &__wait); \ |
223 | } while (0) |
224 | |
225 | /** |
226 | * wait_event_timeout - sleep until a condition gets true or a timeout elapses |
227 | * @wq: the waitqueue to wait on |
228 | * @condition: a C expression for the event to wait for |
229 | * @timeout: timeout, in jiffies |
230 | * |
231 | * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the |
232 | * @condition evaluates to true. The @condition is checked each time |
233 | * the waitqueue @wq is woken up. |
234 | * |
235 | * wake_up() has to be called after changing any variable that could |
236 | * change the result of the wait condition. |
237 | * |
238 | * The function returns 0 if the @timeout elapsed, and the remaining |
239 | * jiffies if the condition evaluated to true before the timeout elapsed. |
240 | */ |
241 | #define wait_event_timeout(wq, condition, timeout) \ |
242 | ({ \ |
243 | long __ret = timeout; \ |
244 | if (!(condition)) \ |
245 | __wait_event_timeout(wq, condition, __ret); \ |
246 | __ret; \ |
247 | }) |
248 | |
249 | #define __wait_event_interruptible(wq, condition, ret) \ |
250 | do { \ |
251 | DEFINE_WAIT(__wait); \ |
252 | \ |
253 | for (;;) { \ |
254 | prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \ |
255 | if (condition) \ |
256 | break; \ |
257 | if (!signal_pending(current)) { \ |
258 | schedule(); \ |
259 | continue; \ |
260 | } \ |
261 | ret = -ERESTARTSYS; \ |
262 | break; \ |
263 | } \ |
264 | finish_wait(&wq, &__wait); \ |
265 | } while (0) |
266 | |
267 | /** |
268 | * wait_event_interruptible - sleep until a condition gets true |
269 | * @wq: the waitqueue to wait on |
270 | * @condition: a C expression for the event to wait for |
271 | * |
272 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the |
273 | * @condition evaluates to true or a signal is received. |
274 | * The @condition is checked each time the waitqueue @wq is woken up. |
275 | * |
276 | * wake_up() has to be called after changing any variable that could |
277 | * change the result of the wait condition. |
278 | * |
279 | * The function will return -ERESTARTSYS if it was interrupted by a |
280 | * signal and 0 if @condition evaluated to true. |
281 | */ |
282 | #define wait_event_interruptible(wq, condition) \ |
283 | ({ \ |
284 | int __ret = 0; \ |
285 | if (!(condition)) \ |
286 | __wait_event_interruptible(wq, condition, __ret); \ |
287 | __ret; \ |
288 | }) |
289 | |
290 | #define __wait_event_interruptible_timeout(wq, condition, ret) \ |
291 | do { \ |
292 | DEFINE_WAIT(__wait); \ |
293 | \ |
294 | for (;;) { \ |
295 | prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \ |
296 | if (condition) \ |
297 | break; \ |
298 | if (!signal_pending(current)) { \ |
299 | ret = schedule_timeout(ret); \ |
300 | if (!ret) \ |
301 | break; \ |
302 | continue; \ |
303 | } \ |
304 | ret = -ERESTARTSYS; \ |
305 | break; \ |
306 | } \ |
307 | finish_wait(&wq, &__wait); \ |
308 | } while (0) |
309 | |
310 | /** |
311 | * wait_event_interruptible_timeout - sleep until a condition gets true or a timeout elapses |
312 | * @wq: the waitqueue to wait on |
313 | * @condition: a C expression for the event to wait for |
314 | * @timeout: timeout, in jiffies |
315 | * |
316 | * The process is put to sleep (TASK_INTERRUPTIBLE) until the |
317 | * @condition evaluates to true or a signal is received. |
318 | * The @condition is checked each time the waitqueue @wq is woken up. |
319 | * |
320 | * wake_up() has to be called after changing any variable that could |
321 | * change the result of the wait condition. |
322 | * |
323 | * The function returns 0 if the @timeout elapsed, -ERESTARTSYS if it |
324 | * was interrupted by a signal, and the remaining jiffies otherwise |
325 | * if the condition evaluated to true before the timeout elapsed. |
326 | */ |
327 | #define wait_event_interruptible_timeout(wq, condition, timeout) \ |
328 | ({ \ |
329 | long __ret = timeout; \ |
330 | if (!(condition)) \ |
331 | __wait_event_interruptible_timeout(wq, condition, __ret); \ |
332 | __ret; \ |
333 | }) |
334 | |
335 | #define __wait_event_interruptible_exclusive(wq, condition, ret) \ |
336 | do { \ |
337 | DEFINE_WAIT(__wait); \ |
338 | \ |
339 | for (;;) { \ |
340 | prepare_to_wait_exclusive(&wq, &__wait, \ |
341 | TASK_INTERRUPTIBLE); \ |
342 | if (condition) { \ |
343 | finish_wait(&wq, &__wait); \ |
344 | break; \ |
345 | } \ |
346 | if (!signal_pending(current)) { \ |
347 | schedule(); \ |
348 | continue; \ |
349 | } \ |
350 | ret = -ERESTARTSYS; \ |
351 | abort_exclusive_wait(&wq, &__wait, \ |
352 | TASK_INTERRUPTIBLE, NULL); \ |
353 | break; \ |
354 | } \ |
355 | } while (0) |
356 | |
357 | #define wait_event_interruptible_exclusive(wq, condition) \ |
358 | ({ \ |
359 | int __ret = 0; \ |
360 | if (!(condition)) \ |
361 | __wait_event_interruptible_exclusive(wq, condition, __ret);\ |
362 | __ret; \ |
363 | }) |
364 | |
365 | #define __wait_event_killable(wq, condition, ret) \ |
366 | do { \ |
367 | DEFINE_WAIT(__wait); \ |
368 | \ |
369 | for (;;) { \ |
370 | prepare_to_wait(&wq, &__wait, TASK_KILLABLE); \ |
371 | if (condition) \ |
372 | break; \ |
373 | if (!fatal_signal_pending(current)) { \ |
374 | schedule(); \ |
375 | continue; \ |
376 | } \ |
377 | ret = -ERESTARTSYS; \ |
378 | break; \ |
379 | } \ |
380 | finish_wait(&wq, &__wait); \ |
381 | } while (0) |
382 | |
383 | /** |
384 | * wait_event_killable - sleep until a condition gets true |
385 | * @wq: the waitqueue to wait on |
386 | * @condition: a C expression for the event to wait for |
387 | * |
388 | * The process is put to sleep (TASK_KILLABLE) until the |
389 | * @condition evaluates to true or a signal is received. |
390 | * The @condition is checked each time the waitqueue @wq is woken up. |
391 | * |
392 | * wake_up() has to be called after changing any variable that could |
393 | * change the result of the wait condition. |
394 | * |
395 | * The function will return -ERESTARTSYS if it was interrupted by a |
396 | * signal and 0 if @condition evaluated to true. |
397 | */ |
398 | #define wait_event_killable(wq, condition) \ |
399 | ({ \ |
400 | int __ret = 0; \ |
401 | if (!(condition)) \ |
402 | __wait_event_killable(wq, condition, __ret); \ |
403 | __ret; \ |
404 | }) |
405 | |
406 | /* |
407 | * Must be called with the spinlock in the wait_queue_head_t held. |
408 | */ |
409 | static inline void add_wait_queue_exclusive_locked(wait_queue_head_t *q, |
410 | wait_queue_t * wait) |
411 | { |
412 | wait->flags |= WQ_FLAG_EXCLUSIVE; |
413 | __add_wait_queue_tail(q, wait); |
414 | } |
415 | |
416 | /* |
417 | * Must be called with the spinlock in the wait_queue_head_t held. |
418 | */ |
419 | static inline void remove_wait_queue_locked(wait_queue_head_t *q, |
420 | wait_queue_t * wait) |
421 | { |
422 | __remove_wait_queue(q, wait); |
423 | } |
424 | |
425 | /* |
426 | * These are the old interfaces to sleep waiting for an event. |
427 | * They are racy. DO NOT use them, use the wait_event* interfaces above. |
428 | * We plan to remove these interfaces. |
429 | */ |
430 | extern void sleep_on(wait_queue_head_t *q); |
431 | extern long sleep_on_timeout(wait_queue_head_t *q, |
432 | signed long timeout); |
433 | extern void interruptible_sleep_on(wait_queue_head_t *q); |
434 | extern long interruptible_sleep_on_timeout(wait_queue_head_t *q, |
435 | signed long timeout); |
436 | |
437 | /* |
438 | * Waitqueues which are removed from the waitqueue_head at wakeup time |
439 | */ |
440 | void prepare_to_wait(wait_queue_head_t *q, wait_queue_t *wait, int state); |
441 | void prepare_to_wait_exclusive(wait_queue_head_t *q, wait_queue_t *wait, int state); |
442 | void finish_wait(wait_queue_head_t *q, wait_queue_t *wait); |
443 | void abort_exclusive_wait(wait_queue_head_t *q, wait_queue_t *wait, |
444 | unsigned int mode, void *key); |
445 | int autoremove_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key); |
446 | int wake_bit_function(wait_queue_t *wait, unsigned mode, int sync, void *key); |
447 | |
448 | #define DEFINE_WAIT_FUNC(name, function) \ |
449 | wait_queue_t name = { \ |
450 | .private = current, \ |
451 | .func = function, \ |
452 | .task_list = LIST_HEAD_INIT((name).task_list), \ |
453 | } |
454 | |
455 | #define DEFINE_WAIT(name) DEFINE_WAIT_FUNC(name, autoremove_wake_function) |
456 | |
457 | #define DEFINE_WAIT_BIT(name, word, bit) \ |
458 | struct wait_bit_queue name = { \ |
459 | .key = __WAIT_BIT_KEY_INITIALIZER(word, bit), \ |
460 | .wait = { \ |
461 | .private = current, \ |
462 | .func = wake_bit_function, \ |
463 | .task_list = \ |
464 | LIST_HEAD_INIT((name).wait.task_list), \ |
465 | }, \ |
466 | } |
467 | |
468 | #define init_wait(wait) \ |
469 | do { \ |
470 | (wait)->private = current; \ |
471 | (wait)->func = autoremove_wake_function; \ |
472 | INIT_LIST_HEAD(&(wait)->task_list); \ |
473 | } while (0) |
474 | |
475 | /** |
476 | * wait_on_bit - wait for a bit to be cleared |
477 | * @word: the word being waited on, a kernel virtual address |
478 | * @bit: the bit of the word being waited on |
479 | * @action: the function used to sleep, which may take special actions |
480 | * @mode: the task state to sleep in |
481 | * |
482 | * There is a standard hashed waitqueue table for generic use. This |
483 | * is the part of the hashtable's accessor API that waits on a bit. |
484 | * For instance, if one were to have waiters on a bitflag, one would |
485 | * call wait_on_bit() in threads waiting for the bit to clear. |
486 | * One uses wait_on_bit() where one is waiting for the bit to clear, |
487 | * but has no intention of setting it. |
488 | */ |
489 | static inline int wait_on_bit(void *word, int bit, |
490 | int (*action)(void *), unsigned mode) |
491 | { |
492 | if (!test_bit(bit, word)) |
493 | return 0; |
494 | return out_of_line_wait_on_bit(word, bit, action, mode); |
495 | } |
496 | |
497 | /** |
498 | * wait_on_bit_lock - wait for a bit to be cleared, when wanting to set it |
499 | * @word: the word being waited on, a kernel virtual address |
500 | * @bit: the bit of the word being waited on |
501 | * @action: the function used to sleep, which may take special actions |
502 | * @mode: the task state to sleep in |
503 | * |
504 | * There is a standard hashed waitqueue table for generic use. This |
505 | * is the part of the hashtable's accessor API that waits on a bit |
506 | * when one intends to set it, for instance, trying to lock bitflags. |
507 | * For instance, if one were to have waiters trying to set bitflag |
508 | * and waiting for it to clear before setting it, one would call |
509 | * wait_on_bit() in threads waiting to be able to set the bit. |
510 | * One uses wait_on_bit_lock() where one is waiting for the bit to |
511 | * clear with the intention of setting it, and when done, clearing it. |
512 | */ |
513 | static inline int wait_on_bit_lock(void *word, int bit, |
514 | int (*action)(void *), unsigned mode) |
515 | { |
516 | if (!test_and_set_bit(bit, word)) |
517 | return 0; |
518 | return out_of_line_wait_on_bit_lock(word, bit, action, mode); |
519 | } |
520 | |
521 | #endif /* __KERNEL__ */ |
522 | |
523 | #endif |
524 |
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