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
10
11#define __WNOTHREAD 0x20000000
12#define __WALL 0x40000000
13#define __WCLONE 0x80000000
14
15
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
28typedef struct __wait_queue wait_queue_t;
29typedef int (*wait_queue_func_t)(wait_queue_t *wait, unsigned mode, int sync, void *key);
30int default_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
31
32struct __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
40struct wait_bit_key {
41 void *flags;
42 int bit_nr;
43};
44
45struct wait_bit_queue {
46 struct wait_bit_key key;
47 wait_queue_t wait;
48};
49
50struct __wait_queue_head {
51 spinlock_t lock;
52 struct list_head task_list;
53};
54typedef struct __wait_queue_head wait_queue_head_t;
55
56struct task_struct;
57
58
59
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
80extern void init_waitqueue_head(wait_queue_head_t *q);
81
82#ifdef CONFIG_LOCKDEP
83# define __WAIT_QUEUE_HEAD_INIT_ONSTACK(name) \
84 ({ init_waitqueue_head(&name); name; })
85# define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) \
86 wait_queue_head_t name = __WAIT_QUEUE_HEAD_INIT_ONSTACK(name)
87#else
88# define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) DECLARE_WAIT_QUEUE_HEAD(name)
89#endif
90
91static inline void init_waitqueue_entry(wait_queue_t *q, struct task_struct *p)
92{
93 q->flags = 0;
94 q->private = p;
95 q->func = default_wake_function;
96}
97
98static inline void init_waitqueue_func_entry(wait_queue_t *q,
99 wait_queue_func_t func)
100{
101 q->flags = 0;
102 q->private = NULL;
103 q->func = func;
104}
105
106static inline int waitqueue_active(wait_queue_head_t *q)
107{
108 return !list_empty(&q->task_list);
109}
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117
118#define is_sync_wait(wait) (!(wait) || ((wait)->private))
119
120extern void FASTCALL(add_wait_queue(wait_queue_head_t *q, wait_queue_t * wait));
121extern void FASTCALL(add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t * wait));
122extern void FASTCALL(remove_wait_queue(wait_queue_head_t *q, wait_queue_t * wait));
123
124static inline void __add_wait_queue(wait_queue_head_t *head, wait_queue_t *new)
125{
126 list_add(&new->task_list, &head->task_list);
127}
128
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130
131
132static inline void __add_wait_queue_tail(wait_queue_head_t *head,
133 wait_queue_t *new)
134{
135 list_add_tail(&new->task_list, &head->task_list);
136}
137
138static inline void __remove_wait_queue(wait_queue_head_t *head,
139 wait_queue_t *old)
140{
141 list_del(&old->task_list);
142}
143
144void FASTCALL(__wake_up(wait_queue_head_t *q, unsigned int mode, int nr, void *key));
145extern void FASTCALL(__wake_up_locked(wait_queue_head_t *q, unsigned int mode));
146extern void FASTCALL(__wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr));
147void FASTCALL(__wake_up_bit(wait_queue_head_t *, void *, int));
148int FASTCALL(__wait_on_bit(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned));
149int FASTCALL(__wait_on_bit_lock(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned));
150void FASTCALL(wake_up_bit(void *, int));
151int FASTCALL(out_of_line_wait_on_bit(void *, int, int (*)(void *), unsigned));
152int FASTCALL(out_of_line_wait_on_bit_lock(void *, int, int (*)(void *), unsigned));
153wait_queue_head_t *FASTCALL(bit_waitqueue(void *, int));
154
155#define wake_up(x) __wake_up(x, TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 1, NULL)
156#define wake_up_nr(x, nr) __wake_up(x, TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, nr, NULL)
157#define wake_up_all(x) __wake_up(x, TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 0, NULL)
158#define wake_up_interruptible(x) __wake_up(x, TASK_INTERRUPTIBLE, 1, NULL)
159#define wake_up_interruptible_nr(x, nr) __wake_up(x, TASK_INTERRUPTIBLE, nr, NULL)
160#define wake_up_interruptible_all(x) __wake_up(x, TASK_INTERRUPTIBLE, 0, NULL)
161#define wake_up_locked(x) __wake_up_locked((x), TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE)
162#define wake_up_interruptible_sync(x) __wake_up_sync((x),TASK_INTERRUPTIBLE, 1)
163
164#define __wait_event(wq, condition) \
165do { \
166 DEFINE_WAIT(__wait); \
167 \
168 for (;;) { \
169 prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE); \
170 if (condition) \
171 break; \
172 schedule(); \
173 } \
174 finish_wait(&wq, &__wait); \
175} while (0)
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188
189#define wait_event(wq, condition) \
190do { \
191 if (condition) \
192 break; \
193 __wait_event(wq, condition); \
194} while (0)
195
196#define __wait_event_timeout(wq, condition, ret) \
197do { \
198 DEFINE_WAIT(__wait); \
199 \
200 for (;;) { \
201 prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE); \
202 if (condition) \
203 break; \
204 ret = schedule_timeout(ret); \
205 if (!ret) \
206 break; \
207 } \
208 finish_wait(&wq, &__wait); \
209} while (0)
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227#define wait_event_timeout(wq, condition, timeout) \
228({ \
229 long __ret = timeout; \
230 if (!(condition)) \
231 __wait_event_timeout(wq, condition, __ret); \
232 __ret; \
233})
234
235#define __wait_event_interruptible(wq, condition, ret) \
236do { \
237 DEFINE_WAIT(__wait); \
238 \
239 for (;;) { \
240 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
241 if (condition) \
242 break; \
243 if (!signal_pending(current)) { \
244 schedule(); \
245 continue; \
246 } \
247 ret = -ERESTARTSYS; \
248 break; \
249 } \
250 finish_wait(&wq, &__wait); \
251} while (0)
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268#define wait_event_interruptible(wq, condition) \
269({ \
270 int __ret = 0; \
271 if (!(condition)) \
272 __wait_event_interruptible(wq, condition, __ret); \
273 __ret; \
274})
275
276#define __wait_event_interruptible_timeout(wq, condition, ret) \
277do { \
278 DEFINE_WAIT(__wait); \
279 \
280 for (;;) { \
281 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
282 if (condition) \
283 break; \
284 if (!signal_pending(current)) { \
285 ret = schedule_timeout(ret); \
286 if (!ret) \
287 break; \
288 continue; \
289 } \
290 ret = -ERESTARTSYS; \
291 break; \
292 } \
293 finish_wait(&wq, &__wait); \
294} while (0)
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313#define wait_event_interruptible_timeout(wq, condition, timeout) \
314({ \
315 long __ret = timeout; \
316 if (!(condition)) \
317 __wait_event_interruptible_timeout(wq, condition, __ret); \
318 __ret; \
319})
320
321#define __wait_event_interruptible_exclusive(wq, condition, ret) \
322do { \
323 DEFINE_WAIT(__wait); \
324 \
325 for (;;) { \
326 prepare_to_wait_exclusive(&wq, &__wait, \
327 TASK_INTERRUPTIBLE); \
328 if (condition) \
329 break; \
330 if (!signal_pending(current)) { \
331 schedule(); \
332 continue; \
333 } \
334 ret = -ERESTARTSYS; \
335 break; \
336 } \
337 finish_wait(&wq, &__wait); \
338} while (0)
339
340#define wait_event_interruptible_exclusive(wq, condition) \
341({ \
342 int __ret = 0; \
343 if (!(condition)) \
344 __wait_event_interruptible_exclusive(wq, condition, __ret);\
345 __ret; \
346})
347
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350
351static inline void add_wait_queue_exclusive_locked(wait_queue_head_t *q,
352 wait_queue_t * wait)
353{
354 wait->flags |= WQ_FLAG_EXCLUSIVE;
355 __add_wait_queue_tail(q, wait);
356}
357
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361static inline void remove_wait_queue_locked(wait_queue_head_t *q,
362 wait_queue_t * wait)
363{
364 __remove_wait_queue(q, wait);
365}
366
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371
372extern void sleep_on(wait_queue_head_t *q);
373extern long sleep_on_timeout(wait_queue_head_t *q,
374 signed long timeout);
375extern void interruptible_sleep_on(wait_queue_head_t *q);
376extern long interruptible_sleep_on_timeout(wait_queue_head_t *q,
377 signed long timeout);
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382void FASTCALL(prepare_to_wait(wait_queue_head_t *q,
383 wait_queue_t *wait, int state));
384void FASTCALL(prepare_to_wait_exclusive(wait_queue_head_t *q,
385 wait_queue_t *wait, int state));
386void FASTCALL(finish_wait(wait_queue_head_t *q, wait_queue_t *wait));
387int autoremove_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
388int wake_bit_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
389
390#define DEFINE_WAIT(name) \
391 wait_queue_t name = { \
392 .private = current, \
393 .func = autoremove_wake_function, \
394 .task_list = LIST_HEAD_INIT((name).task_list), \
395 }
396
397#define DEFINE_WAIT_BIT(name, word, bit) \
398 struct wait_bit_queue name = { \
399 .key = __WAIT_BIT_KEY_INITIALIZER(word, bit), \
400 .wait = { \
401 .private = current, \
402 .func = wake_bit_function, \
403 .task_list = \
404 LIST_HEAD_INIT((name).wait.task_list), \
405 }, \
406 }
407
408#define init_wait(wait) \
409 do { \
410 (wait)->private = current; \
411 (wait)->func = autoremove_wake_function; \
412 INIT_LIST_HEAD(&(wait)->task_list); \
413 } while (0)
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429static inline int wait_on_bit(void *word, int bit,
430 int (*action)(void *), unsigned mode)
431{
432 if (!test_bit(bit, word))
433 return 0;
434 return out_of_line_wait_on_bit(word, bit, action, mode);
435}
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453static inline int wait_on_bit_lock(void *word, int bit,
454 int (*action)(void *), unsigned mode)
455{
456 if (!test_and_set_bit(bit, word))
457 return 0;
458 return out_of_line_wait_on_bit_lock(word, bit, action, mode);
459}
460
461#endif
462
463#endif
464